Abstract:The typical concentration of zinc oxide (ZnO) nanoparticles in municipal wastewater was used to investigate influences of ZnO nanoparticles on the performance of membrane bioreactors (MBRs), sludge properties and membrane fouling. The results indicated that the ZnO nanoparticles had adverse effects on the removal of COD due to the microbial respiration, while they had little impact on the NH3-N removal of the microbial respiration. However, ZnO nanoparticles did not deteriorate the effluent quality of the MBRs at all due to the high retention of micro-filtration (MF) membrane. Meanwhile, the adding ZnO nanoparticles could lead to the increase of soluble microbial products (SMP) from 17.9mg/gVSS to approximately 35.0mg/gVSS and the reduction of sludge particle size from 162.9μm to 105.2μm, which caused the increase of the outer membrane resistance and the deterioration of membrane fouling. Moreover, the inhibition of microbial activity and the change of microbial communities in the activated sludge induced by the addition of ZnO nanoparticles could be attributed to the release of Zn2+ from the adding ZnO nanoparticles to the supernatant.
董梦柯, 周安华, 康军, 陈瑶, 王新华, 李秀芬. 氧化锌纳米颗粒对膜-生物反应器运行性能的影响[J]. 中国环境科学, 2014, 34(7): 1709-1714.
DONG Meng-Ke, ZHOU An-Hua, KANG Jun, CHEN Yao, WANG Xin-Hua, LI Xiu-Fen. Impacts of ZnO nanoparticles on the performance of membrane bioreactors. CHINA ENVIRONMENTAL SCIENCECE, 2014, 34(7): 1709-1714.