Removal efficiency and microbial ecology of internal circulation compound bioreactor for treating low temperature wastewater
Experiments of domestic wastewater treatment were carried out in laboratory for one year to investigate the effect and microbiology of Internal Circulation Compound Bioreactor process (ICCBR), a combination of activated sludge and modified biological contact oxidation. Ecological factors such as temperature, dissolved oxygen, substrate category and concentration, and COD loading of the system were studied. Results showed that the population and activity of microorganism at low temperature were much less than that at moderate temperature. Six preponderant psychrotrophs were selected out from activated sludge which operating at 4°C for more than one year, belonging to Zoogloea,Aeromonas, Flarobacterium, Micrococcus, Bacillus, Pseudomonas, and the COD removal efficiency of these psychrotrophs was 63.67% higher than that of mesophiles at low temperature. By immobilizing the efficient preponderant psychrotrophs on polyurethane foams, the average COD removal in the ICCBR process was 86.66%. COD loading was kept below 1000 mg/L, the effluent COD is below 100 mg/L. While concentrations of dissolved oxygen in activated sludge process unit and modified biological contact oxidation unit were hold at 2.0 ～4.0 mg/L and 4.0 ～8.0 mg/L respectively, the systemic effluent COD could achieve the first-degree B discharge standard of pollutants in China for municipal wastewater treatment plant.
wastewater internal circulation compound bioreactor microbiology psychrotrophs
Yue Ben Zhonglin Chen Zhenzhen Xu Miaomiao Ye Lei Yang Anxi Jiang
State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, P R China
国际会议
The 12th Asian Pacific Confederation of Chemical Engineering Congress(第十二届亚太化工联盟大会暨化工展览会)
大连
英文
2008-08-04（万方平台首次上网日期，不代表论文的发表时间）