Further treatment of secondary effluents before their discharge into the receiving water bodies could alleviate water eutrophication.In this study,the Chlorella proteinosa was cultured in a membrane photobioreactor to...Further treatment of secondary effluents before their discharge into the receiving water bodies could alleviate water eutrophication.In this study,the Chlorella proteinosa was cultured in a membrane photobioreactor to further remove nitrogen from the secondary effluents.The effect of hydraulic retention time(HRT)on microalgae biomass yields and nutrient removal was studied.The results showed that soluble algal products concentration reduced in the suspension at low HRT,thereby alleviating microalgal growth inhibition.In addition,the lower HRT reduced the nitrogen limitation for Chlorella proteinosa’s growth through the phase-out of nitrogen-related functional bacteria.As a result,the productivity for Chlorella proteinosa increased from 6.12 mg/L/day at an HRT of 24 hr to 20.18 mg/L/day at an HRT of 8 hr.The highest removal rates of 19.7 mg/L/day,23.8 mg/L/day,and 105.4 mg/L/day were achieved at an HRT of 8 hr for total nitrogen(TN),ammonia,and chemical oxygen demand(COD),respectively.However,in terms of removal rate,TN and COD were the largest when HRT is 24 hr,which were 74.5%and 82.6%respectively.The maximum removal rate of ammonia nitrogen was 99.2%when HRT was 8 hr.展开更多
为探索适宜重庆市某乡镇污水厂高浓度进水的处理工艺和运行参数,通过搭建“厌氧/缺氧/好氧(A/A/O)+混凝沉淀”中试实验模型,分析污泥浓度、水力停留时间(hydraulic retention time, HRT)、碳氮比(C/N)、混凝剂投加量等因素对污染物去除...为探索适宜重庆市某乡镇污水厂高浓度进水的处理工艺和运行参数,通过搭建“厌氧/缺氧/好氧(A/A/O)+混凝沉淀”中试实验模型,分析污泥浓度、水力停留时间(hydraulic retention time, HRT)、碳氮比(C/N)、混凝剂投加量等因素对污染物去除的影响,提出针对乡镇高浓度污水处理中生物池各运行参数的适宜值,并在实际污水厂运行时能使出水稳定达到一级A标准。以期为乡镇污水处理较高浓度生活污水的运行参数取值提供一定参考。展开更多
基金supported by the China Hunan Provincial Science&Technology Department(Nos.2022SK2091 and 2019JJ50646)the Hunan Provincial Department of Education(Nos.18C0206 and 19B040).
文摘Further treatment of secondary effluents before their discharge into the receiving water bodies could alleviate water eutrophication.In this study,the Chlorella proteinosa was cultured in a membrane photobioreactor to further remove nitrogen from the secondary effluents.The effect of hydraulic retention time(HRT)on microalgae biomass yields and nutrient removal was studied.The results showed that soluble algal products concentration reduced in the suspension at low HRT,thereby alleviating microalgal growth inhibition.In addition,the lower HRT reduced the nitrogen limitation for Chlorella proteinosa’s growth through the phase-out of nitrogen-related functional bacteria.As a result,the productivity for Chlorella proteinosa increased from 6.12 mg/L/day at an HRT of 24 hr to 20.18 mg/L/day at an HRT of 8 hr.The highest removal rates of 19.7 mg/L/day,23.8 mg/L/day,and 105.4 mg/L/day were achieved at an HRT of 8 hr for total nitrogen(TN),ammonia,and chemical oxygen demand(COD),respectively.However,in terms of removal rate,TN and COD were the largest when HRT is 24 hr,which were 74.5%and 82.6%respectively.The maximum removal rate of ammonia nitrogen was 99.2%when HRT was 8 hr.
文摘为探索适宜重庆市某乡镇污水厂高浓度进水的处理工艺和运行参数,通过搭建“厌氧/缺氧/好氧(A/A/O)+混凝沉淀”中试实验模型,分析污泥浓度、水力停留时间(hydraulic retention time, HRT)、碳氮比(C/N)、混凝剂投加量等因素对污染物去除的影响,提出针对乡镇高浓度污水处理中生物池各运行参数的适宜值,并在实际污水厂运行时能使出水稳定达到一级A标准。以期为乡镇污水处理较高浓度生活污水的运行参数取值提供一定参考。
