粉态硫自养反硝化膜生物反应器(p-SMBR)的优化调控:水力停留时间和膜通量的影响

Optimal regulation of powder sulfur autotrophic denitrification membrane bioreactor(p-SMBR):effect of hydraulic retention time/membrane flux

面向污水厂二级出水深度脱氮的需求,构建了粉态硫自养反硝化膜生物反应器(p-SMBR),探究了水力停留时间(HRT)和膜通量对系统脱氮效果以及膜污染特性的影响。研究结果表明,在HRT为4 h时,p-SMBR表现出最佳的反硝化脱氮能力(98%),出水硝酸盐质量浓度<1 mg·L^(-1);同时可改善滤饼层结构,进而缓解膜污染,运行通量为20 L·(m^(2)·h)^(-1)时跨膜压增长速率仅为5.3 kPa·d^(-1)。微生物测序结果表明,Thermomonas和Thiomonas是反应器混合液中相对丰度最高的自养反硝化相关菌属,而Terrimonas和Flavobacterium则是滤饼层中造成膜污染的主要菌属。对p-SMBR的HRT和运行通量进行优化调控,可改变相关菌属的相对含量,进而起到同步高效脱氮与缓解膜污染的作用。

Facing the demand of deep nitrogen removal in the secondary effluent of wastewater plant,powdered sulfur autotrophic denitrification membrane bioreactor(p-SMBR)was constructed,and the influences of hydraulic retention time(HRT)and membrane flux on the nitrogen removal effect as well as membrane fouling characteristics of p-SMBR were investigated.The results showed that the p-SMBR exhibited the best denitrification denitrification capacity(98%)with effluent nitrate concentration lower than 1 mg·L^(−1) at a HRT of 4 h.Meanwhile,the structure of the filter cake layer was ameliorated,and in turn the membrane fouling was alleviated.At the operating flux of 20 L·(m^(2)·h)^(−1),the trans-membrane pressure growth rate was only 5.3 kPa·d^(−1).The results of microbial sequencing showed that Thermomonas and Thiomonas were the most relatively abundant autotrophic denitrification-associated genus in the mixture of p-SMBR,whereas Terrimonas and Flavobacterium were the main genus contributing to membrane fouling in the filter cake layer.Optimizing and regulation of the HRT and operating flux of p-SMBR can change the relative abundance of the relevant genus,which in turn serves to synchronouly realize an efficient nitrogen removal and membrane fouling mitigation.