Optimal regulation of powder sulfur autotrophic denitrification membrane bioreactor(p-SMBR):effect of hydraulic retention time/membrane flux
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.(m2.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.
万方数据
维普
