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Stabilization of estimated glomerular filtration rate in kidney transplantation from deceased donors with acute kidney injuries
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作者 Punlop Wiwattanathum Atiporn Ingsathit +3 位作者 Surasak Kantachuvesiri Nuttapon Arpornsujaritkun Wiwat Tirapanich Vasant Sumethkul 《World Journal of Transplantation》 2016年第4期712-718,共7页
AIM To evaluate and compare the outcomes of kidney transplant(KT) from deceased donors among standard criteria, acute kidney injury(AKI) and expanded criteria donors(ECDs). METHODS This retrospective study included 11... AIM To evaluate and compare the outcomes of kidney transplant(KT) from deceased donors among standard criteria, acute kidney injury(AKI) and expanded criteria donors(ECDs). METHODS This retrospective study included 111 deceased donor kidney transplant recipients(DDKT). Deceased donors were classified as standard criteria donor(SCD), AKI donor and ECD. AKI was diagnosed and classified based on change of serum Cr by acute kidney injury network(AKIN) criteria. Primary outcome was one-year estimated glomerular filtration rate(eG FR) calculated from Cr by CKD-EPI. Multivariate regression analysis was done by adjusting factors such as type of DDKT, %Panel-reactive antibodies, cold ischemic time, the presence of delayed graft function and the use of induction therapy. Significantfactors that can affect the primary outcomes were then identified. RESULTS ECD group had a significantly lower eG FR at one year(33.9 ± 17.3 mL /min) when compared with AKI group(56.6 ± 23.9) and SCD group(63.6 ± 19.9)(P < 0.001). For AKI group, one-year eG FR was also indifferent among AKIN stage 1, 2 or 3. Patients with AKIN stage 3 had progressive increase of eG FR from 49.6 ± 27.2 at discharge to 61.9 ± 29.0 mL /min at one year. From Kaplan-Meier analysis, AKI donor showed better two-year graft survival than ECD(100% vs 88.5%, P = 0.006). Interestingly, AKI group had a stable eG FR at one and two year. The two-year eG FR of AKI group was not significantly different from SCD group(56.6 ± 24.5 mL /min vs 58.6 ± 23.2 mL /min, P = 0.65). CONCLUSION Kidney transplantations from deceased donors with variable stage of acute kidney injuries were associated with favorable two-year allograft function. The outcomes were comparable with KT from SCD. This information supports the option that deceased donors with AKI are an important source of organ for kidney transplantation even in the presence of stage 3 AKI. 展开更多
关键词 ACUTE KIDNEY INJURY DONOR Rising of terminal serum CREATININE ACUTE KIDNEY INJURY network stage Deceased DONOR Estimated glomerular filtration rate STABILIZATION Stabilize allograft function
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Plasma hemoglobin concentration was related to estimated glomerular filtration rate in elderly patients with ischemic cardiomyopathy 被引量:3
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作者 Gang Li,~1 Zhihua Wang,~1 Canjing Zhang,~2 Yang Wang~1 1 Division of Cardiology, Department of Geriatrics, The First Affiliated Hospital, Chongqing Medical University, Chongqing 400016, China 2 Department of Function Examination, Chongqing Xijiao Hospital, Chongqing 400050, China 《Journal of Geriatric Cardiology》 SCIE CAS CSCD 2008年第3期150-154,共5页
Objectives To study the relationship between plasma hemoglobin concentration and estimated glomerular filtration rate (eGFR) in elderly patients with ischemic cardiomyopathy (ICM).Methods Clinical data of patients... Objectives To study the relationship between plasma hemoglobin concentration and estimated glomerular filtration rate (eGFR) in elderly patients with ischemic cardiomyopathy (ICM).Methods Clinical data of patients with coronary heart disease who were discharged from The First Affiliated Hospital,Chongqing Medical University between 2005 and 2007 were analyzed retrospectively. Echocardiography results,plasma hemoglobin and creatinine concentration were abstracted from the medical records.The study included 235 Chinese Hart patients with age 60 years and older with angiography confirmed coronary heart disease,silent myocardial ischemia or angina pectoris,of whom 154 had ICM defined as left ventricular end-diastolic diameter (LVDd),male≥56 mm,female≥51 mm (63. 51±7.70 mm) measured by M-mode echocardiography.The differences in plasma hemoglobin concentration were analyzed retrospec- tively between patients with and without ICM,and between patients with an eGFR【60 ml·min<sup>-1</sup>·1.73m<sup>-2</sup> and those with an eGFR≥60 ml·min<sup>-1</sup>·1.73m<sup>-2</sup>.Results There were no significant differences in plasma hemoglobin concentration and eGFR between ICM and non-ICM group (118.49±20.52 g·L<sup>-1</sup> vs.115.80±23.32 g·L<sup>-1</sup> and 75.13±24.21 ml·min<sup>-1</sup>·1.73m<sup>-2</sup> vs.79.09±28.41 ml·min<sup>- 1</sup>·1.73m<sup>-2</sup>,respectively,both P】0.05).However,in both ICM and non-ICM groups,plasma hemoglobin concentration was lower in those with an eGFR【60 ml·min<sup>-1</sup>·1.73m<sup>-2</sup> compared with compared with those with an eGFR≥60 ml·min<sup>-1</sup>·1.73m<sup>-2</sup> group (112. 29±18.61 g·L<sup>-1</sup> vs.119.92±20.74L<sup>-1</sup>,P【0.05);plasma hemoglobin concentration was related positively to eGFR.Conclusions There were no significant changes in plasma hemoglobin concentration and eGFR;however,plasma hemoglobin concentration was related to eGFR significantly positively in elderly patients with ICM due to coronary heart 展开更多
关键词 ischemic CARDIOMYOPATHY coronary heart disease SILENT myocardial ischemia ANGINA PECTORIS estimated glomerular filtration rate PLASMA HEMOGLOBIN concentration
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Relationships between the Processing Parameters of Melt Blown Nonwoven Fabric and Its Structure and Filtration Property
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作者 Pan Ying(潘莺) +1 位作者 Wang Shanyuan(王善元) 《Journal of Donghua University(English Edition)》 EI CAS 2001年第2期79-84,共6页
Based on the processing experiment and sodium flame test this paper deals with the relationship between processing parameters, structure, and filtration property of melt blown fabric. Through the image analysis of Que... Based on the processing experiment and sodium flame test this paper deals with the relationship between processing parameters, structure, and filtration property of melt blown fabric. Through the image analysis of Questar micro-images in combination with the SEM observation and the measurement of some macrostructure indices, the relationship between the processing parameters and the structure especially the microstructure is emphasized Finally the effect of somestructure factors on filtration properties is discussed theoretically. 展开更多
关键词 MELT blown non-woven fabric filtration efficiency filtration resistance fiber diameter porosity PORE RADIUS distribution average PORE radius.
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Chronic kidney disease in geriatric patients:Estimating glomerular filtration rate in older patients with comorbidities
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作者 Guido Gembillo Luca Soraci Domenico Santoro 《World Journal of Nephrology》 2025年第2期178-181,共4页
Aging is an inevitable process that is usually measured by chronological age,with people aged 65 and over being defined as"older individuals".There is disagreement in the current scientific literature regard... Aging is an inevitable process that is usually measured by chronological age,with people aged 65 and over being defined as"older individuals".There is disagreement in the current scientific literature regarding the best methods to estimate glomerular filtration rate(eGFR)in older adults.Several studies suggest the use of an age-adjusted definition to improve accuracy and avoid overdiagnosis.In contrast,some researchers argue that such changes could complicate the classification of chronic kidney disease(CKD).Several formulas,including the Modification of Diet in Renal Disease,CKD-Epidemiology Collaboration,and Cockcroft-Gault equations,are used to estimate eGFR.However,each of these formulas has significant limitations when applied to older adults,primarily due to sarcopenia and malnutrition,which greatly affect both muscle mass and creatinine levels.Alternative formulas,such as the Berlin Initiative Study and the Full Age Spectrum equations,provide more accurate estimates of values for older adults by accounting for age-related physiological changes.In frail older adults,the use of cystatin C leads to better eGFR calculations to assess renal function.Accurate eGFR measurements improve the health of older patients by enabling better medication dosing.A thorough approach that includes multiple calibrated diagnostic methods and a detailed geriatric assessment is necessary for the effective management of kidney disease and other age-related conditions in older adults. 展开更多
关键词 Chronic kidney disease Estimated glomerular filtration rate Renal alterations Geriatric patients Chronic Kidney Disease-Epidemiology Collaboration Modification of Diet in Renal Disease Cockcroft-Gault formula Berlin initiative study Full age spectrum equation
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Relationship between Obesity, Serum Uric Acid, Serum Potassium and Glomerular Filtration Rate with Electric Left Ventricular Hypertrophy in Blacks Central Africans with High Blood Pressure 被引量:1
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作者 Bertrand Fikahem Ellenga Mbolla Paul Macaire Ossou Nguiet +6 位作者 Richard Loumingou Meo Stéphane Ikama Narcisse Ngangoue Thierry Raoul Gombet Henri Germain Monabeka Benjamn Longo Mbenza Gisèle Kimbally Kaky 《World Journal of Cardiovascular Diseases》 2018年第4期248-255,共8页
The authors conducted a retrospective study over a period of 6 months in a hypertensive population in order to determine the correlation between serum uric acid on glomerular filtration rate (GFR) and estimated serum ... The authors conducted a retrospective study over a period of 6 months in a hypertensive population in order to determine the correlation between serum uric acid on glomerular filtration rate (GFR) and estimated serum potassium with left ventricular hypertrophy (LVH) and obesity. This study enrolled 122 patients including 63 women (51.6%). The mean age was 55.9 ± 10.6 years (range 30 to 74 years). Obesity weight was found in 38 cases (31.1%) of which 20?were men (33.9%) and 18 women (28.6%). Abdominal obesity was found in 104 cases (85.2%). The average serum uric acid in patients with obesity weight was 63.3 ± 18.9 mg/L vs 62.4 ± 14.2 mg/L for no-obese patients (p?= 0.63). The average serum potassium in obese patients was 4.06 ± 0.42 mEq/L vs 4.02 ± 0.46 mEq/L for no-obese (p?= 0.65). The average GFR was 73.4 ± 21.4 ml/L in obese patients vs 66.6 ± 22.6 ml/min in no-obese (p?= 0.03). The LVH was found in 81 cases (66.4%). The LVH was found in 65 (62.5%) obese patients vs?16 (88%) non-obese patients (OR = 4.8, 95% 1.04?-?22?p?= 0.02). Only abdominal?obesity has been correlated with left ventricular hypertrophy after multivariate analysis. Emphasis must be focused on public health actions for effective and appropriate measures against obesity and hypertension, whose prevalence is increasing in our region. 展开更多
关键词 OBESITY High Blood Pressure Glomerular filtration Rate Uric Acid SERUM POTASSIUM Black AFRICAN
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Decreasing serum uric acid levels might be associated with improving estimated glomerular filtration rate (eGFR) in Japanese men
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作者 Nobuyuki Miyatake Kenichi Shikata +1 位作者 Hirofumi Makino Takeyuki Numata 《Health》 2011年第8期498-503,共6页
The link between changes in a subject’s serum uric acid levels and his estimated glomerular filtration rate (eGFR) was evaluated in Japanese men. We used data for 108 Japanese men (45.3 ± 8.0 years) with a 1-yea... The link between changes in a subject’s serum uric acid levels and his estimated glomerular filtration rate (eGFR) was evaluated in Japanese men. We used data for 108 Japanese men (45.3 ± 8.0 years) with a 1-year follow up. eGFR was defined by a new equation developed for Japan. eGFR was weakly correlated with serum uric acid levels (r = –0.287, p = 0.0026) at baseline. Subjects were given advice for dietary and life-style improvement. At the 1-year follow up, almost metabolic syndrome components were significantly improved. However, blood sugar and uric acid did not change and eGFR was significantly decreased. The changes in eGFR were weakly correlated with abdominal circum-ference (r = –0.249, p = 0.0094) and uric acid (r = –0.340, p = 0.0003). A decrease in serum uric acid levels may be associated with improving eGFR in Japanese men. 展开更多
关键词 ABDOMINAL CIRCUMFERENCE Uric Acid Estimated Glomerular filtration Rate (eGFR) METABOLIC Syndrome LIFESTYLE Modification
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CFD Simulation of the Filtration Performance of Fibrous Filter Considering Fiber Electric Potential Field 被引量:2
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作者 Lei Hou Ayang Zhou +3 位作者 Xiao He Wei Li Yan Fu Jinli Zhang 《Transactions of Tianjin University》 EI CAS 2019年第5期437-450,共14页
Aiming at disclosing the quantitative e ects of Coulomb forces on the ltration e ciency of aerosol particles, a three- dimensional random ber model was established to describe the microstructure of brous lters. Then, ... Aiming at disclosing the quantitative e ects of Coulomb forces on the ltration e ciency of aerosol particles, a three- dimensional random ber model was established to describe the microstructure of brous lters. Then, computational mod- els including the ow model, particle model, and electric eld model were constructed to estimate the ltration e ciency using the Fluent custom user-de ned function program, neglecting the non-uniformity of the ber potential and the particle charge distribution. The simulation results using the established models agreed with the data in the literature. In particular, the electric eld force was found to be one of the important factors required to improve the ltration e ciency estimation accuracy for the ultra ne particles. Moreover, the variation tendencies of the ltration e ciency and the pressure drop of brous lters were studied based on the in uence factors of the ber potential, particle charge-to-mass ratio, solid volume fraction, ber diameter, and face velocity. The established models and estimated results will provide important guidance on the design of high-e ciency particulate air lters for aerosol particles. 展开更多
关键词 filtration efficiency COULOMB force Three-dimensional random FIBER model INTERCEPTION CAPTURE BROWNIAN diffusion
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Performance investigation of Fe_3O_4 blended poly(vinylidene fluoride) membrane on filtration and benzyl alcohol oxidation:Evaluation of sufficiency for catalytic reactors 被引量:1
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作者 Huseyin Gumus 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2019年第2期314-321,共8页
Fe_3O_4-PVDF membranes were prepared by blending of magnetic Fe_3O_4 powders with polyvinylidene fluoride to investigate whether those were usable or not in catalytic membrane reactors. Filtration performances and cat... Fe_3O_4-PVDF membranes were prepared by blending of magnetic Fe_3O_4 powders with polyvinylidene fluoride to investigate whether those were usable or not in catalytic membrane reactors. Filtration performances and catalytic activity of membranes in microwave conditions were measured in separate processes. Composite Fe_3O_4-PVDF membranes were characterized by TG-DTA, FTIR, XRD, SEM and contact angle techniques.Disappearing of α-phases at PVDF was observed with increasing amount of additives from XRD diffraction patterns. Decomposition of polymer fastened due to catalytic effect of Fe_3O_4. Finger-like structures and large number of small pores were observed at the SEM images. Those provided effective transportation of substrate among the active sites of catalyst. At the experiments conducted in batch reactor, 51%, 77%, 66% and 63% benzyl alcohol conversion were recorded for 2%, 4%, 6% and 8% Fe_3O_4-PVDF composite pieces respectively. Catalyst were separated magnetically and reused several times. On the other hand Fe_3O_4 blended PVDF membranes provided improved flux and BSA rejection compared with performance of bare PVDF membrane; 41.6% BSA rejection was obtained with 4% Fe_3O_4-PVDF whereas it was only 6.7% for PVDF. Fe_3O_4-PVDF composites performed high activity for the benzyl alcohol oxidation in batch reactor and also better filtration at filtration cell. These results promise to obtain practical and low cost membrane material for catalytic reactors usable in microwave support to get fast results. 展开更多
关键词 BENZYL ALCOHOL oxidation Magnetic iron oxide Polymer SUPPORTED catalyst PVDF filtration membranes
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Cake Filtration Equation Using tan<sup>n</sup><i>θ</i>Reduction Method
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作者 Obiajulu E. Udegbunam Joel O. Ademiluyi 《Journal of Water Resource and Protection》 2017年第7期851-872,共22页
This study was completed by an extensive mathematical analysis. New equation to sludge filtration processes has been proposed for use in routine laboratory. The equation has been suggested to replace Ademiluyi’s cake... This study was completed by an extensive mathematical analysis. New equation to sludge filtration processes has been proposed for use in routine laboratory. The equation has been suggested to replace Ademiluyi’s cake filtration equation in view of the limitations of the latter. The new equation can be used for sludges whose compressibility factor is more than one but Ademiluyi’s cake filtration equation can only be used for sludges whose compressibility coefficient is less than one. The new sludge filtration equation was derived using tannθ reduction method. The generalized equation thus obtained resembles Ademiluyi’s equation in the mode of parameter combination except the presence of summation notation in the new equation. 展开更多
关键词 tannθ Method Reduction Formula SLUDGE filtration EQUATION Piezometric POSITIONS and COMPRESSIBILITY Factor
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Modeling of Continuous Cross-flow Microfiltration Process in an Airlift External-loop Slurry Reactor 被引量:3
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作者 Zheng Bo Tang Xiaojin +1 位作者 Zhang Zhanzhu Zong Baoning 《China Petroleum Processing & Petrochemical Technology》 SCIE CAS 2019年第1期117-122,共6页
New modified combination mathematical models including the pores blocking models and the cake layer models were developed to describe the continuous cross-flow microfiltration in an airlift external loop slurry reacto... New modified combination mathematical models including the pores blocking models and the cake layer models were developed to describe the continuous cross-flow microfiltration in an airlift external loop slurry reactor. The pores blocking models were created based on the standard blocking law and the intermediate blocking law, and then the cake layer models were developed based on the hydrodynamic theory in which the calculation method of porosity of cake layer was newly corrected. The Air-Water-FCC equilibrium catalysts cold model experiment was used to verify the relevant models.Results showed that the calculated values fitted well with experimental data with a relative error of less than 10%. 展开更多
关键词 AIRLIFT external-loop SLURRY reactor CROSS-FLOW MICROfiltration filtration resistance mathematical model
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Ensuring water security by utilizing roof-harvested rainwater and lake water treated with a low-cost integrated adsorption-filtration system 被引量:2
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作者 Riffat Shaheed Wan Hanna Melini Wan Mohtar Ahmed El-Shafie 《Water Science and Engineering》 EI CAS CSCD 2017年第2期115-124,共10页
Drinking water is supplied through a centralized water supply system and may not be accessed by communities in rural areas of Malaysia.This study investigated the performance of a low-cost, self-prepared combined acti... Drinking water is supplied through a centralized water supply system and may not be accessed by communities in rural areas of Malaysia.This study investigated the performance of a low-cost, self-prepared combined activated carbon and sand filtration(CACSF) system for roofharvested rainwater and lake water for potable use. Activated carbon was self-prepared using locally sourced coconut shell and was activated using commonly available salt rather than a high-tech procedure that requires a chemical reagent. The filtration chamber was comprised of local,readily available sand. The experiments were conducted with varying antecedent dry intervals(ADIs) of up to 15 d and lake water with varying initial chemical oxygen demand(COD) concentration. The CACSF system managed to produce effluents complying with the drinking water standards for the parameters p H, dissolved oxygen(DO), biochemical oxygen demand(BOD5), COD, total suspended solids(TSS), and ammonia nitrogen(NH_3-N). The CACSF system successfully decreased the population of Escherichia coli(E. coli) in the influents to less than 30 CFU/m L. Samples with a higher population of E. coli(that is, greater than 30 CFU/m L) did not show 100% removal. The system also showed high potential as an alternative for treated drinking water for roof-harvested rainwater and class II lake water. 展开更多
关键词 LOW-COST activated carbon INTEGRATED adsorption-sand filtration Roof-harvested RAINWATER Lake WATER WATER security
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Decreasing serum uric acid levels are associated with improving estimated glomerular filtration rate (eGFR) in Japanese women
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作者 Nobuyuki Miyatake Kenichi Shikata +1 位作者 Hirofumi Makino Takeyuki Numata 《Open Journal of Epidemiology》 2013年第2期40-43,共4页
The aim of this study was to investigate the link between changes in a subject’s serum uric acid levels and the estimated glomerular filtration rate (eGFR) in Japanese women. We used data for 161 Japanese women (49.8... The aim of this study was to investigate the link between changes in a subject’s serum uric acid levels and the estimated glomerular filtration rate (eGFR) in Japanese women. We used data for 161 Japanese women (49.8 ± 11.7 years) with a 1-year follow up. eGFR was defined by a new equation developed for Japan. eGFR was negatively correlated with serum uric acid levels (r = -0.402, p 展开更多
关键词 Uric Acid Estimated Glomerular filtration Rate (eGFR) LIFESTYLE Modification BLOOD Pressure (BP)
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Lignocellulosic Biocomposite Membranes for Air Filtration and Environmental Protection:A Review
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作者 Abiodun Abdulhameed Amusa Anwar Johari +4 位作者 Kamil Kayode Katibi Ibrahim Garba Shitu Abdulrahman Oyekanmi Adeleke Mohd Fairus Mohd Yasin Muhammad Thalhah Zainal 《Journal of Renewable Materials》 2025年第2期251-272,共22页
The increasing severity of air pollution necessitates more effective and sustained air filtration technology.Concurrently,the desire for more environmentally friendly,sustainable materials with better filtering perfor... The increasing severity of air pollution necessitates more effective and sustained air filtration technology.Concurrently,the desire for more environmentally friendly,sustainable materials with better filtering performance and less environmental impact drives the move away from conventional synthetic membranes.This review presents lignocellulosic biocomposite(LigBioComp)membranes as an alternative to traditional synthetic membranes.It focuses on their materials,fabrication,and functionalization techniques while exploring challenges and proposing methods for resourceful utilization.Renowned for their abundance and renewable nature,lignocellulosic materials consist of cellulose,hemicellulose,and lignin.Various applications can benefit from their antibacterial properties,large surface area,and remarkable mechanical strength.LigBioComp membranes are fabricated through casting,electrospinning,and freeze-drying,with advancements in fabrication techniques enhancing their performance and applicability.It is suggested to use solvent-free or low-solvent techniques such as Layer-by-Layer assembly to minimize environmental impact.Freeze-drying and electrospinning with green solvents can be used for achieving specific membrane properties,though energy consumption should be considered.Apply dry-wet spinning and solvent casting processes selectively.Functional groups,including carboxyl,hydroxyl,or amino groups,can significantly improve the membrane’s capacity to capture particulate matter.Chemical etching or the precise deposition of nanoparticles can further optimize pore size and distribution.The choice of chemicals and methods is critical in functionalization,with silane coupling agents,polyethyleneimine,and polydopamine.Future research should prioritize refining fabrication methods,advancing functionalization strategies,and conducting performance and recyclability assessments on hybrid and composite materials.This will enhance integrated systems and contribute to the development of smart filters. 展开更多
关键词 LIGNOCELLULOSE BIOCOMPOSITES renewable materials sustainable membranes environmental protection particulate matter removal air filtration technology
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Modeling 3D Ex-Filtration Process of a Soak-Away Rain Garden
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作者 Sivarajah Mylevaganam Ting Fong May Chui Jiangyong Hu 《Journal of Geoscience and Environment Protection》 2015年第3期35-51,共17页
This paper presents a three-dimensional (3D) model developed using COMSOL Multiphysics to understand the 3D ex-filtration process of a soak-away rain garden. With a design hyetograph of 3-month average rainfall intens... This paper presents a three-dimensional (3D) model developed using COMSOL Multiphysics to understand the 3D ex-filtration process of a soak-away rain garden. With a design hyetograph of 3-month average rainfall intensities of Singapore, it is found that the average vertical ex-filtration rate that is obtained by dividing the average vertical ex-filtration (drained through bottom of the soak-away rain garden, averaged over the simulation period = 720 min, and expressed in m3) by the surface area of the soak-away rain garden and the simulation time step is almost constant regardless of increase in saturated hydraulic conductivity (K) of the in-situ soil and the surface area of the soak-away rain garden as a percentage of catchment area. However, as depth to groundwater table which is measured from bottom of the filter media increases, in between 0.5 m and 1 m of depth to groundwater table, the average vertical ex-filtration rate decreases significantly (by around 15 - 20 mm/hr) and the decrease is almost twice, compared with that between 1 m and 1.5 m of depth to groundwater table. Furthermore, this study shows that for a given K of in-situ, K of filter media, and depth to groundwater table, as the surface area of the soak-away rain garden increases, the horizontal flow coefficient which is defined as the ratio between total horizontal ex-filtration (drained through sides of the soak-away rain garden, summed over the simulation period, and expressed in m3) and total vertical ex-filtration (drained through bottom of the soak-away rain garden, summed over the simulation period, and expressed in m3) decreases. Moreover, for a given surface area of the soak-away rain garden, K of in-situ, and depth to groundwater table, the horizontal flow coefficient decreases as K of the filter media increases. However, it is found that for a given surface area of the soak-away rain garden, K of in-situ, and K of filter media, the horizontal flow coefficient increases as depth to groundwater table increases. 展开更多
关键词 COMSOL MULTIPHYSICS 3D Ex-filtration Soak-Away RAIN GARDEN AVERAGE Vertical Ex-filtration Rate Horizontal Flow Coefficient
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Advanced Phosphorus Removal and Needs for Recovery by Enhanced Filtration of Municipal Wastewater 被引量:1
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作者 Stig Morling Mattias Feldthusen 《Journal of Water Resource and Protection》 2019年第5期626-637,共12页
The need for an advanced and even far reaching phosphorus removal at municipal WWTPs may soon get stipulations in relation to a reuse of phosphorus (P). This paper discusses the possible ways to remove phosphorous fro... The need for an advanced and even far reaching phosphorus removal at municipal WWTPs may soon get stipulations in relation to a reuse of phosphorus (P). This paper discusses the possible ways to remove phosphorous from municipal wastewater. This is already an established demand in many countries. However, as P is a limited raw material, this need for a reuse of P will become an example of what now is labelled “cyclic economy”. For instance, a national demand from the German state is already put in force. In this perspective the advanced filtration techniques will play an interesting role, and most possibly a crucial role. Examples are presented from several municipal WWTPs already in operation with a final polishing treatment step based on chemical precipitation and separation of phosphorus. Typical stable discharge P levels are found at these plants at levels < 0.05 to 0.10 ppm. The new demands on phosphorus recovery will also call for modified process concepts for the WWTP;for instance, a refined biological phosphorus removal (EBP) attains more attention and he needed very low discharge levels of P, where the enhanced P-removal will include different smart filtration techniques. 展开更多
关键词 PHOSPHORUS Advanced REMOVAL Chemical PRECIPITATION filtration Techniques REUSE of Purified Water
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DUAL FILTRATION EFFECT OF GEOCHEMICAL AND BIOGEOCHEMICAL PROCESSES IN THE CHANGJIANG ESTUARY 被引量:2
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作者 田汝成 陈吉余 周菊珍 《Chinese Journal of Oceanology and Limnology》 SCIE CAS CSCD 1991年第1期33-43,共11页
Dissolved nutrients (NO3- , PO4 3- , SiO32- ) and oxygen , chlorophyll- a , pH and Eh were measured on board during a cruise in August 1988 in the Changjiang Estuary region . Heavy metals , organic matter and carbonat... Dissolved nutrients (NO3- , PO4 3- , SiO32- ) and oxygen , chlorophyll- a , pH and Eh were measured on board during a cruise in August 1988 in the Changjiang Estuary region . Heavy metals , organic matter and carbonate contents were analyzed in laboratory. The results show that geochemical processes in the Changjiang Estuary have dual filtration effect: on the one hand geochemical filtration effect, reflected by ferromanganese oxide flocculation and sedimentation , occurs near the turbidity maximum, and leads to enrichment of heavy metals in suspended matter and sedi -ments; on the other hand biogeochemical filtration , reflected by nutrients consumption , organic matter and carbonate sedimentation and enrichment of trace elements in suspended matter. occurs outside the plume water front. The biogeochemical filtration affects the environmental conditions ; the dissolved oxygen and pH increase in surface water and decrease in bottom water. The biogeochemical filtration effect outside the plume front is 展开更多
关键词 filtration suspended SEDIMENTATION NUTRIENTS dissolved carbonate GEOCHEMICAL ESTUARY nitrate outside
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Establishing the presence or absence of chronic kidney disease:Uses and limitations of formulas estimating the glomerular filtration rate 被引量:8
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作者 Ahmed Alaini Deepak Malhotra +6 位作者 Helbert Rondon-Berrios Christos P Argyropoulos Zeid J Khitan Dominic SC Raj Mark Rohrscheib Joseph I Shapiro Antonios H Tzamaloukas 《World Journal of Methodology》 2017年第3期73-92,共20页
The development of formulas estimating glomerular filtration rate(eG FR) from serum creatinine and cystatin C and accounting for certain variables affecting the production rate of these biomarkers, including ethnicity... The development of formulas estimating glomerular filtration rate(eG FR) from serum creatinine and cystatin C and accounting for certain variables affecting the production rate of these biomarkers, including ethnicity, gender and age, has led to the current scheme of diagnosing and staging chronic kidney disease(CKD),which is based on e GFR values and albuminuria.This scheme has been applied extensively in various populations and has led to the current estimates of prevalence of CKD. In addition, this scheme is applied in clinical studies evaluating the risks of CKD and the efficacy of various interventions directed towards improving its course. Disagreements between creatinine-based and cystatin-based e GFR values and between e GFR values and measured GFR have been reported in various cohorts. These disagreements are the consequence of variations in the rate of production and in factors, other than GFR, affecting the rate of removal of creatinine and cystatin C. The disagreements create limitations for all e GFR formulas developed so far. The main limitations are low sensitivity in detecting early CKD in several subjects, e.g., those with hyperfiltration, and poor prediction of the course of CKD. Research efforts in CKD are currently directed towards identification of biomarkers that are better indices of GFR than the current biomarkers and,particularly, biomarkers of early renal tissue injury. 展开更多
关键词 Chronic kidney disease Serum creatinine Creatinine clearance Creatinine excretion Estimated glomerular filtration rate Cystatin C Renal imaging HYPERfiltration Biomarkers of chronic kidney disease
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Application of a hybrid gravity-driven membrane filtration and dissolved ozone flotation(MDOF)process for wastewater reclamation and membrane fouling mitigation 被引量:1
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作者 Xin Jin Wei Wang +5 位作者 Shuai Wang Pengkang Jin Xiaochang C.Wang Wushou Zhang Weijun An Yong Wang 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2019年第7期17-27,共11页
This study proposed a novel membrane filtration and dissolved ozone flotation integrated(MDOF) process and tested it at pilot scale. Membrane filtration in the MDOF process was operated in gravity-driven mode, and req... This study proposed a novel membrane filtration and dissolved ozone flotation integrated(MDOF) process and tested it at pilot scale. Membrane filtration in the MDOF process was operated in gravity-driven mode, and required no backwashing, flushing, or chemical cleaning. Because ozone was added in the MDOF process, ozonation, coagulation, and membrane filtration could occur in a single reactor. Moreover, in situ ozonation occurred in the MDOF process, which differs from the conventional pre-ozonation membrane filtration process. Significant enhancement of turbidity removal was further achieved through the addition of membrane filtration. Membrane fouling was mitigated in the MDOF process compared to the MDAF process. In situ ozonation in the MDOF process decreased the fluorescence intensity and transformed the high MW dissolved organics into small MW compounds. For the fouling layer, the extracellular polymeric substance(EPS) contents and cake layer morphology were analyzed. The results indicated that the contents of EPS decreased. Furthermore, a thinner and more loosely structured cake layer formed in the MDOF process. Because coagulation and ozonation occurred simultaneously in a single reactor, the generation of hydroxyl radicals was enhanced through the catalytic effect of Al-based coagulants on ozone decomposition, which further alleviated membrane fouling in the MDOF process. 展开更多
关键词 Dissolved OZONE FLOTATION Gravity-driven MEMBRANE filtration MEMBRANE fouling In situ ozonation
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Filtration efficiency and purification mechanism of MgO-based ceramic filters on molten steel
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作者 Wen Yan Ying Liu +2 位作者 Jin-wen Song Yu Liu Guang-qiang Li 《Journal of Iron and Steel Research International》 2025年第6期1514-1525,共12页
Pure magnesia filter and periclase-spinel filter were prepared using porous MgO powder and Al2O3 micro-powder as raw materials.The filtration efficiency and purification mechanism of the two sets of filters on molten ... Pure magnesia filter and periclase-spinel filter were prepared using porous MgO powder and Al2O3 micro-powder as raw materials.The filtration efficiency and purification mechanism of the two sets of filters on molten steel were investigated through steel casting tests.The results show that on the basis of surviving the thermal shock of molten steel,both filters can significantly reduce the number of non-metallic inclusions and total oxygen content of steel,thereby improving the cleanliness of the molten steel.After the thermal shock of molten steel,cracks were found in the microstructure of pure magnesia filter.Via the diffusion of non-metallic inclusions from steel into MgO grains of the filter to form solid solution,the inclusions were adsorbed to the internal and external surfaces of the pure magnesia filter.The number of inclusions was reduced by 62.5%,and the total oxygen content decreased from 0.892 to 0.265 wt.%after filtration,achieving a filtration efficiency of 70.3%.Compared with the pure magnesia filter,no cracks were found in the microstructure of the periclase-spinel filter.The mass transfer rate was accelerated due to the diffusion of inclusions from steel into MgO and MgAl2O4 grains of the filter,as well as the higher high-temperature liquid content and smaller pore structure of the filter.More non-metallic inclusions were able to enter the interior of the filter,which made the periclase-spinel filter more capable of adsorbing inclusions from steel and reducing total oxygen content.The periclase-spinel filter reduced the number of inclusions in steel by 84.4%and decreased the total oxygen content of the steel from 0.892 to 0.119 wt.%,with a filtration efficiency of 86.7%,demonstrating excellent comprehensive performance. 展开更多
关键词 MgO-based ceramic filter Periclase-spinel filter Steel casting test filtration efficiency Purification mechanism Interface reaction
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Longitudinal assessment of measured and estimated glomerular filtration-rate in autosomal dominant polycystic kidney disease:Real practice experience
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作者 Juan M Fernandez JoséC Rodriguez-Pérez +3 位作者 M Mercedes Lorenzo-Medina Fancisco Rodriguez-Esparragon Juan C Quevedo-Reina Carmen R Hernandez-Socorro 《World Journal of Nephrology》 2025年第1期99-109,共11页
BACKGROUND Equations for estimation glomerular filtration rate(eGFR)have been associated with poor clinical performance and their clinical accuracy and reliability have been called into question.AIM To assess the long... BACKGROUND Equations for estimation glomerular filtration rate(eGFR)have been associated with poor clinical performance and their clinical accuracy and reliability have been called into question.AIM To assess the longitudinal changes in measured glomerular filtration rate(mGFR)in patients with autosomal dominant polycystic kidney disease(ADPKD).METHODS Analysis of an ambispective data base conducted on consecutive patients diagnosed with ADPKD.The mGFR was assessed by iohexol clearance;while eGFR was calculated by three different formulas:(1)The chronic kidney disease epidemiology collaboration(CKD-EPI);(2)Modification of diet in renal disease(MDRD);and(3)The 24-hour urine creatinine clearance(CrCl).The primary end-points were the mean change in mGFR between the baseline and final visit,as well as the comparison of the mean change in mGFR with the change estimated by the different formulas.RESULTS Thirty-seven patients were included in the study.As compared to baseline,month-6 mGFR was significantly decrease by-4.4 mL/minute±10.3 mL/minute(P=0.0132).However,the CKD-EPI,MDRD,and CrCl formulas underestimated this change by 48.3%,89.0%,and 45.8%respectively,though none of these differences reached statistical significance(P=0.3647;P=0.0505;and P=0.736,respectively).The discrepancies between measured and estimated glomerular filtration rate values,as evaluated by CKD-EPI(r=0.29,P=0.086);MDRD(r=0.19,P=0.272);and CrCl(r=0.09,P=0.683),were not correlated with baseline mGFR values.CONCLUSION This study indicated that eGFR inaccurately reflects the decline in mGFR and cannot reliably track changes over time.This poses significant challenges for clinical decision-making,particularly in treatment strategies. 展开更多
关键词 Autosomal dominant polycystic kidney disease Glomerular filtration rate End-stage kidney disease IOHEXOL Chronic kidney disease epidemiology collaboration Modification of diet in renal disease
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