In Wuxi Wastewater Treatment Plant, the Anaerobic, anoxic and oxic (A2/O) process was employed to remove the nitrogen and phosphorus, which exhibited the positive results of the high removal efficiency for phosphorus ...In Wuxi Wastewater Treatment Plant, the Anaerobic, anoxic and oxic (A2/O) process was employed to remove the nitrogen and phosphorus, which exhibited the positive results of the high removal efficiency for phosphorus with a range of 67.7% to 89.9% and an average value of 78.0. The effluent of phosphorus met the national discharge standard. The removal of TN was effected by both BOD variation of influent and wastewater temperature. TN removal was in the range of 28.5% to 55.8% with an average value of 39.4%. The energy cost was 0.15 kWh(m3d)-1 or 1.35 kWh(kgBOD@d)-1. The annual average sludge production was 46.3 m3d-1, the annual average dosage for the dewatering was 40 kg d-1 .展开更多
This research involved attempting to improve water quality at the Abu-Rawash WWTP by using aluminum chloride (AlCl3) as a coagulant combined with injection of carbon dioxide (CO2). The Abu-Rawash WWTP is the main sour...This research involved attempting to improve water quality at the Abu-Rawash WWTP by using aluminum chloride (AlCl3) as a coagulant combined with injection of carbon dioxide (CO2). The Abu-Rawash WWTP is the main source of water quality degradation at the Rosetta branch, Egypt. Sewage samples were collected from the effluent of the grit removal chamber. Jar tests were performed to estimate the optimum pH value and the coagulant dosage required to obtain acceptable treatment. Eleven samples were prepared with equal dosages of aluminum chloride (10.0 mg/L) and different pH values. The optimal pH values for the elimination of the biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), and turbidity ranged from 6.10 to 6.20 for the aluminum chloride. Results indicated that the appropriate AlCl3 dosage was 2.0 mg/L, especially at pH between 6.1 and 6.2. The results also showed that the AlCl3 was cost effective, especially after reducing pH value. It is also more cost effective than the other proposed solutions such as changing the effluent path of the Abu-Rawash WWTP to the desert.展开更多
Modelling is a tool used to simulate the performance of any type of WWTP(wastewater treatment plant)which empowers the user to optimize the response of works by changing influent loads and operational conditions with ...Modelling is a tool used to simulate the performance of any type of WWTP(wastewater treatment plant)which empowers the user to optimize the response of works by changing influent loads and operational conditions with minimum effort and low cost.STOAT(sewage treatment operational analysis over time)software is used to simulate the performance of wastewater treatment plants dynamically.In this paper,a model was built by STOAT software for the Hannoville WWTP allowing to analyze and study the enquiries in a shorter period of time associated with laboratory analysis.Additionally,the model can be used to estimate the response of the system to a diversity of problems.The hydraulic shock load was tested for the entire WWTP consequently allowing the application of strategies that guarantee a better performance by presenting the analysis for the entire plant.Through the aid of STOAT software,a model was built for the whole plant with daily sewage volume entering the treatment plant in a year.The study showed whether the plant can accept a higher flow than that it regularly receives or not.This proved to be successful and the plant has the possibility to accept double the hydraulic shock load,meanwhile,the variations of resulting data were acceptable when compared to the Egyptian environmental requirements.展开更多
Wastewater treatment plants （WWTPs） can represent risks source for human health and environment, due to the use of chemicals and substances produced by the treatment process. In particular, considering a conventiona...Wastewater treatment plants （WWTPs） can represent risks source for human health and environment, due to the use of chemicals and substances produced by the treatment process. In particular, considering a conventional urban wastewater treatment plant, two case studies have been considered in this paper： the phase of disinfection with Peracetic Acid （PAA）, used as reactant and the sludge anaerobic digestion, generating biogas. The aim of the experience is to find out some management suggestions that could make safer these sections of a WWTP.展开更多
【目的】“3060”碳目标的提出,激励各个行业聚焦“双碳”问题。污水处理过程中产生碳源和碳汇,对其进行核算是非常有必要的。【方法】文章针对运营企业层面,研究污水处理厂碳排放影响因素,进一步分析碳排放特征和碳中和潜力,为污水处...【目的】“3060”碳目标的提出,激励各个行业聚焦“双碳”问题。污水处理过程中产生碳源和碳汇,对其进行核算是非常有必要的。【方法】文章针对运营企业层面,研究污水处理厂碳排放影响因素,进一步分析碳排放特征和碳中和潜力,为污水处理厂低碳运行调整提供依据。文章通过明确运营企业管理范围内碳排放核算边界,结合实际工艺运行情况选取切实可用的碳核算方法和排放因子,对该运营企业管理的8座污水处理厂展开碳排放核算和分析。【结果】研究显示,该运营企业总碳排放量为1.95×10^(5) t CO_(2)/a,总碳排放强度为0.25 kg CO_(2)/m^(3)。8座污水厂年碳排放量为7365.8~53083.1 t CO_(2)/a,碳排放强度为0.17~0.47 kg CO_(2)/m^(3)。污水处理厂碳排放强度与吨水电耗相关性系数(R^(2))为0.94,与吨水药耗R^(2)为0.91,从工艺类型考虑,碳排放强度表现为氧化沟<厌氧/缺氧/好氧(AAO)<AAO+膜生物反应器(MBR)<曝气生物滤池(BAF),这主要跟工艺运行电耗、药耗相关;按碳源贡献进行修正的污染物削减综合指数、耗氧污染物削减量,均与碳排放强度相关性增强;在采用光伏发电、再生水回用等减排措施后,WWTP1净碳排放强度为-0.022 kg CO_(2)/m^(3)。【结论】该运营企业管理的污水厂采用工艺不同,碳排放差异较大,根本原因是受吨水药耗、吨水电耗的影响;在碳排放研究时,应当考虑碳源对直接碳排放的影响;利用厂区环境和工艺优势,该运营企业管理的污水厂可实现厂区运行碳中和目标。展开更多
文摘In Wuxi Wastewater Treatment Plant, the Anaerobic, anoxic and oxic (A2/O) process was employed to remove the nitrogen and phosphorus, which exhibited the positive results of the high removal efficiency for phosphorus with a range of 67.7% to 89.9% and an average value of 78.0. The effluent of phosphorus met the national discharge standard. The removal of TN was effected by both BOD variation of influent and wastewater temperature. TN removal was in the range of 28.5% to 55.8% with an average value of 39.4%. The energy cost was 0.15 kWh(m3d)-1 or 1.35 kWh(kgBOD@d)-1. The annual average sludge production was 46.3 m3d-1, the annual average dosage for the dewatering was 40 kg d-1 .
文摘This research involved attempting to improve water quality at the Abu-Rawash WWTP by using aluminum chloride (AlCl3) as a coagulant combined with injection of carbon dioxide (CO2). The Abu-Rawash WWTP is the main source of water quality degradation at the Rosetta branch, Egypt. Sewage samples were collected from the effluent of the grit removal chamber. Jar tests were performed to estimate the optimum pH value and the coagulant dosage required to obtain acceptable treatment. Eleven samples were prepared with equal dosages of aluminum chloride (10.0 mg/L) and different pH values. The optimal pH values for the elimination of the biological oxygen demand (BOD), chemical oxygen demand (COD), total suspended solids (TSS), and turbidity ranged from 6.10 to 6.20 for the aluminum chloride. Results indicated that the appropriate AlCl3 dosage was 2.0 mg/L, especially at pH between 6.1 and 6.2. The results also showed that the AlCl3 was cost effective, especially after reducing pH value. It is also more cost effective than the other proposed solutions such as changing the effluent path of the Abu-Rawash WWTP to the desert.
文摘Modelling is a tool used to simulate the performance of any type of WWTP(wastewater treatment plant)which empowers the user to optimize the response of works by changing influent loads and operational conditions with minimum effort and low cost.STOAT(sewage treatment operational analysis over time)software is used to simulate the performance of wastewater treatment plants dynamically.In this paper,a model was built by STOAT software for the Hannoville WWTP allowing to analyze and study the enquiries in a shorter period of time associated with laboratory analysis.Additionally,the model can be used to estimate the response of the system to a diversity of problems.The hydraulic shock load was tested for the entire WWTP consequently allowing the application of strategies that guarantee a better performance by presenting the analysis for the entire plant.Through the aid of STOAT software,a model was built for the whole plant with daily sewage volume entering the treatment plant in a year.The study showed whether the plant can accept a higher flow than that it regularly receives or not.This proved to be successful and the plant has the possibility to accept double the hydraulic shock load,meanwhile,the variations of resulting data were acceptable when compared to the Egyptian environmental requirements.
文摘Wastewater treatment plants （WWTPs） can represent risks source for human health and environment, due to the use of chemicals and substances produced by the treatment process. In particular, considering a conventional urban wastewater treatment plant, two case studies have been considered in this paper： the phase of disinfection with Peracetic Acid （PAA）, used as reactant and the sludge anaerobic digestion, generating biogas. The aim of the experience is to find out some management suggestions that could make safer these sections of a WWTP.
文摘【目的】“3060”碳目标的提出,激励各个行业聚焦“双碳”问题。污水处理过程中产生碳源和碳汇,对其进行核算是非常有必要的。【方法】文章针对运营企业层面,研究污水处理厂碳排放影响因素,进一步分析碳排放特征和碳中和潜力,为污水处理厂低碳运行调整提供依据。文章通过明确运营企业管理范围内碳排放核算边界,结合实际工艺运行情况选取切实可用的碳核算方法和排放因子,对该运营企业管理的8座污水处理厂展开碳排放核算和分析。【结果】研究显示,该运营企业总碳排放量为1.95×10^(5) t CO_(2)/a,总碳排放强度为0.25 kg CO_(2)/m^(3)。8座污水厂年碳排放量为7365.8~53083.1 t CO_(2)/a,碳排放强度为0.17~0.47 kg CO_(2)/m^(3)。污水处理厂碳排放强度与吨水电耗相关性系数(R^(2))为0.94,与吨水药耗R^(2)为0.91,从工艺类型考虑,碳排放强度表现为氧化沟<厌氧/缺氧/好氧(AAO)<AAO+膜生物反应器(MBR)<曝气生物滤池(BAF),这主要跟工艺运行电耗、药耗相关;按碳源贡献进行修正的污染物削减综合指数、耗氧污染物削减量,均与碳排放强度相关性增强;在采用光伏发电、再生水回用等减排措施后,WWTP1净碳排放强度为-0.022 kg CO_(2)/m^(3)。【结论】该运营企业管理的污水厂采用工艺不同,碳排放差异较大,根本原因是受吨水药耗、吨水电耗的影响;在碳排放研究时,应当考虑碳源对直接碳排放的影响;利用厂区环境和工艺优势,该运营企业管理的污水厂可实现厂区运行碳中和目标。
