Aeration optimization through operation at low dissolved oxygen concentrations:Evaluation of oxygen mass transfer dynamics in different activated sludge systems

查看全文 作　　者：Haitao [1]Fan;Lu [1]Qi;Guoqiang [2]Liu;Yuankai [1]Zhang;Qiang [1]Fan;Hongchen [1]Wang

机构地区：[1]Research Center for Low Carbon Technology of Water Environment,Renmin University of China;[2]School of Environment,Jinan University

出　　处：《Journal of Environmental Sciences》索引2017年第29卷第5期,共12页

基　　金：supported by the National Science and Technology Major Project(No.2013ZX07314-001) 摘　　要：In wastewater treatment plants(WWTPs)using the activated sludge process,two methods are widely used to improve aeration efficiency — use of high-efficiency aeration devices and optimizing the aeration control strategy. Aeration efficiency is closely linked to sludge characteristics(such as concentrations of mixed liquor suspended solids(MLSS)and microbial communities)and operating conditions(such as air flow rate and operational dissolved oxygen(DO)concentrations). Moreover,operational DO is closely linked to effluent quality. This study,which is in reference to WWTP discharge class A Chinese standard effluent criteria,determined the growth kinetics parameters of nitrifiers at different DO levels in small-scale tests. Results showed that the activated sludge system could meet effluent criteria when DO was as low as 0.3 mg/L,and that nitrifier communities cultivated under low DO conditions had higher oxygen affinity than those cultivated under high DO conditions,as indicated by the oxygen half-saturation constant and nitrification ability. Based on nitrifier growth kinetics and on the oxygen mass transfer dynamic model(determined using different air flow rate(Q′_(air))and mixed liquor volatile suspended solids(MLVSS)values),theoretical analysis indicated limited potential for energy saving by improving aeration diffuser performance when the activated sludge system had low oxygen consumption; however,operating at low DO and low MLVSS could significantly reduce energy consumption. Finally,a control strategy coupling sludge retention time and MLVSS to minimize the DO level was discussed,which is critical to appropriate setting of the oxygen point and to the operation of low DO treatment technology. 关键词：通风优化低溶解的氧氮的硝化作用混合白酒推迟了固体氧集体转移氧举起率

相关文献

参考文献（35）
引证文献（10）
耦合文献（0）

参考文献(35)

引证文献(10)

互联网出版许可证新出网证(渝)字10号全国400电话 - 免长途话费

Aeration optimization through operation at low dissolved oxygen concentrations:Evaluation of oxygen mass transfer dynamics in different activated sludge systems

参考文献(35)

引证文献(10)

用户提示