The Impact of Biological Enzyme Activity on Multi-level Membrane Bioreactor Treating Sewage from Ships
Sewage discharged by ships has become a serious threat to marine environments.For discussing process efficiency and microbial mechanisms while disposing salt-containing ship sewage,in this study,a novel air-lift multilevel circulation MBR was operated to explore process performances and related enzyme activities under different salinity (0,0.7%,1.4%,2.1%,2.8% and 3.5%).The results indicated that the effluent COD increased from 88 mg/L to 288 mg/L with increased salinity from 0 to 2.1%,and the effluent quality became worse at salinity of 3.5%.During the operation period,the COD removal rate decreased from the initial 91.3% to 69.6%,and then dropped to 53.8%.The effluent pH performed a increasing trend under higher salinity.With the increase of salinity,microbial enzyme activities were significantly inhibited.The activities of polyhenol oxidase,nitrate reductase,invertase,and urease were all dropped from 163.7,236.8,7689,and 16519μ -mol/h -gfw to 66.7,158,5389,and 11895 μ ·mol/h ·gfw,respectively.The amount of activated sludge increased under higher salinity,whereas the activities of the four enzymes showed a downward trend.The lower enzyme activities were also in accordance with the lower COD removal rates under higher salinity.
MBR salinity enzyme activity MLSS pH COD removal rate
Shi Yue Li Xin Dai Linchong Li Zhuo Jing Shuo
College of Power and Energy Engineering, Harbin Engineering University, Harbin 150001, China
国际会议
2013青岛国际脱盐大会(Qingdao International Conference 2013 on Desalination and Water Reuse)
青岛
英文
362-368
2013-06-25（万方平台首次上网日期，不代表论文的发表时间）