Characteristic of COD removal and sludge settleability in biological treatment of hypersaline wastewater  

作　　者：祝贵兵 彭永臻 孟祥胜 崔有为 孙亚男 

机构地区：[1]School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China [2]School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, China,Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100022, China [3]Key Laboratory of Beijing Water Quality Science and Water Environment Recovery Engineering, Beijing University of Technology, Beijing 100022, China

出　　处：《Journal of Harbin Institute of Technology(New Series)》2006年第5期632-634,共3页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the Key Items of National Natural Science Foundation of China (Grant No. 50138010) and National 10th5 -year Scientific Research Project of Ministry of Science and Technology of China (Grant No.2001BA610A-09).

摘　　要：In order to investigate the feasibility of biological treatment of bypersaline wastewater produced from toilet flushing with seawater at low temperature, pilot-scale studies were established with plug-flow activated sludge process at low temperature （5-9℃） based on bench-scale experiments. The critical salinity concentration of 30 g/L, which resulted from the cooperation results of the non-halophilic bacteria and the halophilic bacteria, was drawn in bench-scale experiment. Pilot-scale studies showed that high COD removal efficiency, higher than 85 %, was obtained at low temperature when 30 percent seawater [ seawater/（seawater ＋ sewage） ] was introduced. The salinity improved the settleability of activated sludge, and average SV dropped down from 38% to 22. 5% after adding seawater. Sludge bulking could be forborne effectively because filamentous bacteria couldn＇t subsist under high salinity concentration.In order to investigate the feasibility of biological treatment of hypersaline wastewater produced from toilet flushing with seawater at low temperature, pilot-scale studies were established with plug-flow activated sludge process at low temperature (5-9℃) based on bench-scale experiments. The critical salinity concentration of 30 g/L, which resulted from the cooperation results of the non-halophilic bacteria and the halophilic bacteria, was drawn in bench-scale experiment. Pilot-scale studies showed that high COD removal efficiency, higher than 85%, was obtained at low temperature when 30 percent seawater [seawater/(seawater+sewage)] was introduced. The salinity improved the settleability of activated sludge, and average SV dropped down from 38% to 22.5% after adding seawater. Sludge bulking could be forborne effectively because filamentous bacteria couldn’t subsist under high salinity concentration.

关 键 词：flushing lavatory with seawater hypersaline wastewater organic substrate removal sludge settleability pilot-scale study 

分 类 号：TU99[建筑科学—市政工程]