溶解性微生物产物对浸没式膜生物反应器运行的影响

Effects of Soluble Microbial Product on the Performance of Submerged Membrane Bioreactor

对溶解性微生物产物(SMP)的累积行为及其对浸没式膜生物反应器(SMBR)操作运行的影响进行了研究.在90 d的实验过程中,对总有机碳(TOC)、相对分子质量分布(MWDs)、比耗氧速率(SOUR)进行定期监测,采用死端过滤实验来检测SMP对膜污染的影响.结果表明,在SMBR上清液中SMP出现明显累积;随着实验运行,SMP中相对分子质量大于10 000的浓度增加显著;与相对分子质量小于1 000的SMP相比,此部分SMP对污泥活性和膜污染影响较大,对SMBR的出水水质影响较小.

The behaviors of soluble microbial products（SMP） and SMP effects on an operational process of submerged membrane bioreactor （SMBR）were studied. Within 90 days performance period, total organic carbon（TOC）, molecular weight distributions（MWDs）, specific oxygen uptake rate（SOUR）were periodically monitored. The dead-end filtration tests were used to indicate the SMP effect on membrane fouling. Experiment results showed that the concentration of SMP in SMBR supernatant obviously accumulated. As the operation time was prolonged, the concentrations of SMP with MW 〉 10 000 remarkably increased in SMBR supernatant. Compared with the SMP of MW 〈 1 000, the SMP with MW 〉 10 000 obviously affected sludge activity and membrane fouling, but did not significantly influence the SMBR effluent.