The understanding of ozonation in bubble columns is the first step to describe this process for organic and inorganic pollutants in water medium in this equipment.This paper developed mathematical models for decomposi...The understanding of ozonation in bubble columns is the first step to describe this process for organic and inorganic pollutants in water medium in this equipment.This paper developed mathematical models for decomposition of ozone in liquid phase,with analytical solution for zero,first and second-orders kinetics for different pH values,with and without gaseous phase mass transfer effect in the ozone transfer to the liquid phase.The results models are satisfactory when compared with experimental data,and indicate the importance to consider such effects.展开更多
Continuous dynamic experiment was conducted for the treatment of low-concentration organic waste gas with xylene as a representative, using micro-nano bubble and peroxymonosulfate working in synergy. The degradation r...Continuous dynamic experiment was conducted for the treatment of low-concentration organic waste gas with xylene as a representative, using micro-nano bubble and peroxymonosulfate working in synergy. The degradation rule of xylene under different conditions such as the ORP value of the spray liquid, pH value of the spray liquid, liquid-gas ratio of the spray liquid, residence time of xylene, and initial concentration of xylene was investigated. The results showed that at a low concentration, the pH value of the spray liquid had little effect on the degradation rate of xylene. The degradation rate of xylene rose with the increase of the ORP value of the spray liquid, the liquid-gas ratio of the spray liquid, the residence time of xylene, and the initial concentration of xylene.展开更多
With the continuous deepening of rural revitalization strategy and the increasingly strict sewage discharge standards,rural domestic sewage treatment technology is facing higher challenges and requirements.The combine...With the continuous deepening of rural revitalization strategy and the increasingly strict sewage discharge standards,rural domestic sewage treatment technology is facing higher challenges and requirements.The combined process of micro-electrolysis+micro-nano bubbles coupled with peroxymonosulfate was constructed in this study,and the treatment effect and application value of this technology were explored with the actual rural domestic sewage as the treatment object.The experimental results showed that under the conditions of HRT of 120 min,PMS dosage of 0.15 mmol/L,pH=7,MBs air intake of 15 ml/min,current intensity of 15 A,and Fe/C mass ratio of 1:1,the removal rates of COD,ammonia nitrogen and total phosphorus can reach 88.55%,77.18%and 74.67%,respectively.Under the condition that the pH value of sewage was not adjusted,the non-biochemical simultaneous decarbonization,denitrification and phosphorus removal of rural domestic sewage can be achieved by micro-electrolysis and micro-nano bubbles coupled with peroxymonosulfate.The concentrations of effluent COD,ammonia nitrogen and total phosphorus met the requirements of the first level standard of the Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities(DB45T2413-2021).And the comprehensive operating cost was about 1.15 yuan/m 3.展开更多
Organic pollutants could be degraded by using bubble discharge in water with gas aeration in the discharge reactor and more plasma can be generated in the discharge process. When pulsed high voltage was applied betwee...Organic pollutants could be degraded by using bubble discharge in water with gas aeration in the discharge reactor and more plasma can be generated in the discharge process. When pulsed high voltage was applied between electrodes with gas aerated into the reactor, it showed that bubbles were broken, which meant that breakdown took place. It could also be observed that the removal rate of phenol increased with increasing discharge voltage or pulse frequency, and with reducing initial phenol concentration or solution electric conductivity. It could remove more amount of phenol by oxygen aeration. With increasing oxygen flow rate, the removal rate increased. There was little difference with air or nitrogen aeration for phenol removal. The solution temperature after discharge increased to a great extent. However, this part of energy consumption did not contribute to the reaction, which led to a reduction in the energy utilization efficiency.展开更多
The activation of oxygen by ferrous(Fe^(2+))to generate·OH for contaminants degradation was inhibited due to the low utilization of oxygen,thus limiting its application in the practical environment.In this study,...The activation of oxygen by ferrous(Fe^(2+))to generate·OH for contaminants degradation was inhibited due to the low utilization of oxygen,thus limiting its application in the practical environment.In this study,with the superior oxygenation capacity of micro-nano bubbles(MNBs)and the stronger O_(2) activation capacity of Fe^(2+)-oxalate complexes,the MNBs/Fe^(2+)/oxalate(Ox)system was constructed with 4,4′-sulfonyldiphenol(BPS)as the main target emerging contaminants(ECs),and to investigate the enhancement contribution and reinforcement mechanism of the involvement of MNBs to the removal efficiency of ECs in the Fe^(2+)/Ox system.It was shown that the MNBs/Fe^(2+)/Ox system could effectively degrade four structurally diverse ECs.In this case,with BPS as the main target contaminant,adding MNBs could increase the BPS removal efficiency by about 35%.In the MNBs/Fe^(2+)/Ox system,the degradation rate of BPS depended on the concentration of Fe^(Ⅱ)(Ox)_(2)^(2-),while the extent of degradation was mainly governed by Fe^(Ⅱ)(Ox)_(2)^(2-)and Fe^(Ⅱ)(Ox)^(0).EPR and probe experiments showed that the reactive oxygen species(ROS)produced by the system and the iron hydroxide complexes produced by Fe^(3+)hydrolysis contributed to the degradation of BPS by oxidation and coagulation,respectively.In particular,·OH and O_(2)^(·-)were the main reactive oxygen species produced by this system.Moreover,the involvement of MNBs significantly increased the formation of ROS and iron hydroxide complexes in the Fe^(2+)/Ox system.The oxygenation process of MNBs used in this study enhanced the contaminants degradation performance of the Fe^(2+)/O_(x) system and has broadened the application scope of MNBs.展开更多
Cleaning a surface using a solution containing a large number of micro to nano scale bubbles has significant advantage regarding environmental protection.This review first briefly introduces the cleaning mechanism of ...Cleaning a surface using a solution containing a large number of micro to nano scale bubbles has significant advantage regarding environmental protection.This review first briefly introduces the cleaning mechanism of micro-nano bubbles(MNBs),including physical and chemical effects.Then the applications of MNBs in cleaning of metal parts,precision parts,cultural relics or food are introduced.After that,coupled cleaning method of ultrasound and bubbles is introduced.Finally,the characterization methods for the cleaning effect are introduced,which mainly focuses on the changes of physico-chemical properties(mass or cleaning area,infiltration,colony number and light scattering intensity)of the cleaned parts or that(like conductivity)of the solvent.It is believed that MNBs technology will be applied in a broader range of surface cleaning applications.展开更多
The material loss caused by bubble collapse during the micro-nano bubbles auxiliary chemical mechanical polishing(CMP)process cannot be ignored.In this study,the material removal mechanism of cavitation in the polishi...The material loss caused by bubble collapse during the micro-nano bubbles auxiliary chemical mechanical polishing(CMP)process cannot be ignored.In this study,the material removal mechanism of cavitation in the polishing process was investigated in detail.Based on the mixed lubrication or thin film lubrication,bubble-wafer plastic deformation,spherical indentation theory,Johnson-Cook(J-C)constitutive model,and the assumption of periodic distribution of pad asperities,a new model suitable for micro-nano bubble auxiliary material removal in CMP was developed.The model integrates many parameters,including the reactant concentration,wafer hardness,polishing pad roughness,strain hardening,strain rate,micro-jet radius,and bubble radius.The model reflects the influence of active bubbles on material removal.A new and simple chemical reaction method was used to form a controllable number of micro-nano bubbles during the polishing process to assist in polishing silicon oxide wafers.The experimental results show that micro-nano bubbles can greatly increase the material removal rate(MRR)by about 400%and result in a lower surface roughness of 0.17 nm.The experimental results are consistent with the established model.In the process of verifying the model,a better understanding of the material removal mechanism involved in micro-nano bubbles in CMP was obtained.展开更多
文摘The understanding of ozonation in bubble columns is the first step to describe this process for organic and inorganic pollutants in water medium in this equipment.This paper developed mathematical models for decomposition of ozone in liquid phase,with analytical solution for zero,first and second-orders kinetics for different pH values,with and without gaseous phase mass transfer effect in the ozone transfer to the liquid phase.The results models are satisfactory when compared with experimental data,and indicate the importance to consider such effects.
基金Supported by Guigang City Science Research and Technology Development Plan Project(GUIKEJI2203014).
文摘Continuous dynamic experiment was conducted for the treatment of low-concentration organic waste gas with xylene as a representative, using micro-nano bubble and peroxymonosulfate working in synergy. The degradation rule of xylene under different conditions such as the ORP value of the spray liquid, pH value of the spray liquid, liquid-gas ratio of the spray liquid, residence time of xylene, and initial concentration of xylene was investigated. The results showed that at a low concentration, the pH value of the spray liquid had little effect on the degradation rate of xylene. The degradation rate of xylene rose with the increase of the ORP value of the spray liquid, the liquid-gas ratio of the spray liquid, the residence time of xylene, and the initial concentration of xylene.
基金Supported by Research Foundation Ability Enhancement Project for Young and Middle-aged Teachers in Guangxi Universities(2023KY2049).
文摘With the continuous deepening of rural revitalization strategy and the increasingly strict sewage discharge standards,rural domestic sewage treatment technology is facing higher challenges and requirements.The combined process of micro-electrolysis+micro-nano bubbles coupled with peroxymonosulfate was constructed in this study,and the treatment effect and application value of this technology were explored with the actual rural domestic sewage as the treatment object.The experimental results showed that under the conditions of HRT of 120 min,PMS dosage of 0.15 mmol/L,pH=7,MBs air intake of 15 ml/min,current intensity of 15 A,and Fe/C mass ratio of 1:1,the removal rates of COD,ammonia nitrogen and total phosphorus can reach 88.55%,77.18%and 74.67%,respectively.Under the condition that the pH value of sewage was not adjusted,the non-biochemical simultaneous decarbonization,denitrification and phosphorus removal of rural domestic sewage can be achieved by micro-electrolysis and micro-nano bubbles coupled with peroxymonosulfate.The concentrations of effluent COD,ammonia nitrogen and total phosphorus met the requirements of the first level standard of the Discharge Standard of Water Pollutants for Rural Domestic Sewage Treatment Facilities(DB45T2413-2021).And the comprehensive operating cost was about 1.15 yuan/m 3.
基金supported by the Fundamental Research Funds for the Central Universities of China(HEUCFZ1124,HEUCFR1005)the Open Research Fund Program of State Key Laboratory of Water Resources and Hydropower Engineering Science of China(2010B077)
文摘Organic pollutants could be degraded by using bubble discharge in water with gas aeration in the discharge reactor and more plasma can be generated in the discharge process. When pulsed high voltage was applied between electrodes with gas aerated into the reactor, it showed that bubbles were broken, which meant that breakdown took place. It could also be observed that the removal rate of phenol increased with increasing discharge voltage or pulse frequency, and with reducing initial phenol concentration or solution electric conductivity. It could remove more amount of phenol by oxygen aeration. With increasing oxygen flow rate, the removal rate increased. There was little difference with air or nitrogen aeration for phenol removal. The solution temperature after discharge increased to a great extent. However, this part of energy consumption did not contribute to the reaction, which led to a reduction in the energy utilization efficiency.
基金financially supported by the National Natural Science Foundation of China(Nos.52470014 and 52370100)the Department of Education of Gansu Province(China):Major Cultivation Project of Scientific Research Innovation Platform in University(No.2024CXPT-14).
文摘The activation of oxygen by ferrous(Fe^(2+))to generate·OH for contaminants degradation was inhibited due to the low utilization of oxygen,thus limiting its application in the practical environment.In this study,with the superior oxygenation capacity of micro-nano bubbles(MNBs)and the stronger O_(2) activation capacity of Fe^(2+)-oxalate complexes,the MNBs/Fe^(2+)/oxalate(Ox)system was constructed with 4,4′-sulfonyldiphenol(BPS)as the main target emerging contaminants(ECs),and to investigate the enhancement contribution and reinforcement mechanism of the involvement of MNBs to the removal efficiency of ECs in the Fe^(2+)/Ox system.It was shown that the MNBs/Fe^(2+)/Ox system could effectively degrade four structurally diverse ECs.In this case,with BPS as the main target contaminant,adding MNBs could increase the BPS removal efficiency by about 35%.In the MNBs/Fe^(2+)/Ox system,the degradation rate of BPS depended on the concentration of Fe^(Ⅱ)(Ox)_(2)^(2-),while the extent of degradation was mainly governed by Fe^(Ⅱ)(Ox)_(2)^(2-)and Fe^(Ⅱ)(Ox)^(0).EPR and probe experiments showed that the reactive oxygen species(ROS)produced by the system and the iron hydroxide complexes produced by Fe^(3+)hydrolysis contributed to the degradation of BPS by oxidation and coagulation,respectively.In particular,·OH and O_(2)^(·-)were the main reactive oxygen species produced by this system.Moreover,the involvement of MNBs significantly increased the formation of ROS and iron hydroxide complexes in the Fe^(2+)/Ox system.The oxygenation process of MNBs used in this study enhanced the contaminants degradation performance of the Fe^(2+)/O_(x) system and has broadened the application scope of MNBs.
基金Financial supports from the Ministry of Science and Technology,China(No.ZK20210004)the Department of Science and Technology of Shandong Province,China(No.ZK20200026)are gratefully acknowledged.
文摘Cleaning a surface using a solution containing a large number of micro to nano scale bubbles has significant advantage regarding environmental protection.This review first briefly introduces the cleaning mechanism of micro-nano bubbles(MNBs),including physical and chemical effects.Then the applications of MNBs in cleaning of metal parts,precision parts,cultural relics or food are introduced.After that,coupled cleaning method of ultrasound and bubbles is introduced.Finally,the characterization methods for the cleaning effect are introduced,which mainly focuses on the changes of physico-chemical properties(mass or cleaning area,infiltration,colony number and light scattering intensity)of the cleaned parts or that(like conductivity)of the solvent.It is believed that MNBs technology will be applied in a broader range of surface cleaning applications.
基金supported by the National Natural Science Foundation of China(No.51975343)Science and Technology Major Project of Inner Mongolia Autonomous Region in China(No.2021ZD0028)+1 种基金Shanghai Technical Service Center for Advanced Ceramics Structure Design and Precision Manufacturing(No.20DZ2294000)the China Scholarship Council.
文摘The material loss caused by bubble collapse during the micro-nano bubbles auxiliary chemical mechanical polishing(CMP)process cannot be ignored.In this study,the material removal mechanism of cavitation in the polishing process was investigated in detail.Based on the mixed lubrication or thin film lubrication,bubble-wafer plastic deformation,spherical indentation theory,Johnson-Cook(J-C)constitutive model,and the assumption of periodic distribution of pad asperities,a new model suitable for micro-nano bubble auxiliary material removal in CMP was developed.The model integrates many parameters,including the reactant concentration,wafer hardness,polishing pad roughness,strain hardening,strain rate,micro-jet radius,and bubble radius.The model reflects the influence of active bubbles on material removal.A new and simple chemical reaction method was used to form a controllable number of micro-nano bubbles during the polishing process to assist in polishing silicon oxide wafers.The experimental results show that micro-nano bubbles can greatly increase the material removal rate(MRR)by about 400%and result in a lower surface roughness of 0.17 nm.The experimental results are consistent with the established model.In the process of verifying the model,a better understanding of the material removal mechanism involved in micro-nano bubbles in CMP was obtained.
