期刊文献+
共找到2篇文章
< 1 >
每页显示 20 50 100
Denitrifying phosphorus removal in a step-feed CAST with alternating anoxic-oxic operational strategy 被引量:28
1
作者 MA Juan PENG Yongzhen +3 位作者 WANG Shuying WANG Li LIU Yangt MA Ningpin 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2009年第9期1169-1174,共6页
A bench-scale cyclic activated sludge technology (CAST) was operated to study the biological phosphorus removal performance and a series of batch tests was carried out to demonstrate the accumulation of denitrifying... A bench-scale cyclic activated sludge technology (CAST) was operated to study the biological phosphorus removal performance and a series of batch tests was carried out to demonstrate the accumulation of denitrifying polyphosphate-accumulating organisms (DNPAOs) in CAST system. Under all operating conditions, step-feed CAST with enough carbon sources in influent had the highest nitrogen and phosphorus removal efficiency as well as good sludge settling performance. The average removal rate of COD, NH4^+-N, PO4^3--P and total nitrogen (TN) was 88.2%, 98.7%, 97.5% and 92.1%, respectively. The average sludge volume index (SVI) was 133 mL/g. The optimum anaerobic/aerobic/anoxic (AOA) conditions for the cultivation of DNPAOs could be achieved by alternating anoxic/oxic operational strategy, thus a significant denitrifying phosphorus removal occurred in step-feed CAST. The denitrification of NO^x--N completed quickly due to step-feed operation and enough carbon sources, which could enhance phosphorus release and further phosphorus uptake capability of the system. Batch tests also proved that polyphosphate-accumulating organisms (PAOs) in the step-feed process had strong denitrifying phosphorus removal capacity. Both nitrate and nitrite could be used as electron acceptors in denitrifying phosphorus removal. Low COD supply with step-feed operation strategy would favor DNPAOs accumulation. 展开更多
关键词 cyclic activated sludge technology biological phosphorus removal denitrifying polyphosphate-accumulating organisms
下载PDF
Applying real-time control to enhance the performance of nitrogen removal in CAST system 被引量:10
2
作者 WANG Shao-po PENG Yong-zhen +1 位作者 WANG Shu-ying GAO Shou-you 《Journal of Environmental Sciences》 SCIE EI CAS CSCD 2005年第5期736-739,共4页
A bench-scale reactor(72 L) red with domestic sewage, was operated more than 3 months with three operation modes: traditional mode, modified mode and real-time control mode, so as to evaluate effects of the operati... A bench-scale reactor(72 L) red with domestic sewage, was operated more than 3 months with three operation modes: traditional mode, modified mode and real-time control mode, so as to evaluate effects of the operation mode on the system performance and to develop a feasible control strategy. Results obtained from fixed-time control study indicate that the variations of the pH and oxidation-reduction potential(ORP) profiles can represent dynamic characteristics of system and the cycle sequences can be controlled and optimized by the control points on the pH and ORP profiles. A control strategy was, therefore, developed and applied to real-time control mode. Compared with traditional mode, the total nitrogen(TN) removal can be increased by approximately 16% in modified mode and a mean TN removal of 92% was achieved in real-time control mode. Moreover, approximately 12.5% aeration energy was saved in real- time control mode. The result of this study shows that the performance of nitrogen removal was enhanced in modified operation mode. Moreover, the real-time control made it possible to optimize process operation and save aeration energy. 展开更多
关键词 cyclic activated sludge technology biological nitrogen removal real-time control oxidation-reduction potential(ORP)
下载PDF
上一页 1 下一页 到第
使用帮助 返回顶部