Abstract：To explore inhibition mechanism of apparent nitrification rate in membrane bio-reactor (MBR) under salinity, nitrification of the activated sludge in MBR under different salinity was simulated by batch experiments. The apparent nitrification rate, the autotrophic bacteria activity and the amount of deoxyribonucleic acid (DNA) and protein in both SMP and EPS were determined. The results showed that as the salinity increased, the apparent nitrification rate gradually decreased. When the salinity was over 12.5g/L, NH4+-N content in the system increased. Also, the autotrophic bacteria activity was gradually inhibited, and the inhibition level was positively correlated with the salinity. Meanwhile, the amount of DNA in SMP and EPS increased when the salinity was over 2.5g/L, indicating that the inhibition of sludge activity was resulted from the destroying of cell structure. The amount of protein in SMP and EPS significantly raised as the salinity increased, showing that the release of NH4+-N due to the protein hydrolyzed in the sludge system was also the reason for the decline of the apparent nitrification rate. With salinity under 12.5g/L, the influence of NH4+-N releasing on apparent nitrification rate decline was increased with the increase of salinity.
李彬, 王志伟, 安莹, 吴志超. 盐度对膜-生物反应器污泥表观硝化速率的抑制机理[J]. 中国环境科学, 2014, 34(2): 371-377.
LI Bin, WANG Zhi-Wei, AN Ying, WU Zhi-Chao. Inhibition mechanisms of apparent nitrification rate in membrane bio-reactor with salinity. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(2): 371-377.
