Real-time control of aerobic/anoxic digestion for waste activated sludge  

作　　者：张艳萍 彭永臻 王淑莹 汪苹 

机构地区：[1]College of Chemical and Environmental Engineering,Beijing Technology and Business University [2]College of Environmental and Energy Engineering,Beijing University of Technology

出　　处：《Journal of Beijing Institute of Technology》2011年第1期138-142,共5页北京理工大学学报（英文版）

基　　金：Supported by the National High Technology Research and Development Program of China("863"Program)(2006AA06Z319);the National Key Technology R&D Programof the 11th Five-Year Plan China(2007BAK36B07);the Research Foundation for Youth Scholars of Beijing Technology and Business University(QNJJ-28)

摘　　要：Experiments were conducted to study the performance characters of aerobic/anoxic （A/ A） digestion of sludge at 30± 1 ℃, while the sludge retention time （SRT） was kept 16 d. The varia tions of oxidation reduction potential （Eh ） and pH were continuously monitored during the A/A di gestion and the conversions of ammonium and nitrate were investigated. Important features on both Eh and pH profiles were identified to develop process control strategy. Since the feature point on Eh profile where d2 Eh/dt^2 =0 is very stable during anoxic cycle, it can be used to determine the end of denitrification. The end of nitrification can be identified according to dpH/dt = 0. A real-time control strategy of A/A digestion of sludge was developed and tested with pH and Eh as control parameters. It is shown that the performance of the real-time control strategy is better than that of a fixed time control strategy. While the real time controlled A/A digestion system can achieve a similar volatile suspended solids （VSS） destruction efficiency of 35.2 % as a continuously aerated system, it im proves the supernatant quality in a shorter aeration time（7. 75 d for a 20 d period）.Experiments were conducted to study the performance characters of aerobic/anoxic （A/ A） digestion of sludge at 30± 1 ℃, while the sludge retention time （SRT） was kept 16 d. The varia tions of oxidation reduction potential （Eh ） and pH were continuously monitored during the A/A di gestion and the conversions of ammonium and nitrate were investigated. Important features on both Eh and pH profiles were identified to develop process control strategy. Since the feature point on Eh profile where d2 Eh/dt^2 =0 is very stable during anoxic cycle, it can be used to determine the end of denitrification. The end of nitrification can be identified according to dpH/dt = 0. A real-time control strategy of A/A digestion of sludge was developed and tested with pH and Eh as control parameters. It is shown that the performance of the real-time control strategy is better than that of a fixed time control strategy. While the real time controlled A/A digestion system can achieve a similar volatile suspended solids （VSS） destruction efficiency of 35.2 % as a continuously aerated system, it im proves the supernatant quality in a shorter aeration time（7. 75 d for a 20 d period）.

关 键 词：aerobic/anoxic digestion real time control waste activated sludge volatile suspendedsolids（VSS） reduction 

分 类 号：X703[环境科学与工程—环境工程]