Effects of multi-walled carbon nanotubes and sodium dodecylbenzenesulfonate on the performance and microbial community of SBR
With the widespread application of multi-walled carbon nanotubes(MWCNTs),they may have an impact on the activated sludge system after entering the sewage treatment system.Surfactants are common contaminants in wastewater,and the change in the impact of MWCNTs on activated sludge systems may occur after surfactants adsorption on MWCNTs.To explore the effects and mechanisms of multi-walled carbon nanotubes(MWCNTs)and surfactants on activated sludge systems,sodium dodecylbenzene sulfonate(SDBS)was used as a representative surfactant to investigate the effects of MWCNTs or SDBS on the operational performance and microbial community structure of a sequencing batch reactor(SBR).The results showed that during the 22-day continuous operation period of SBR,SDBS and MWCNTs enhanced its COD removal rate to varying degrees.MWCNTs had slight effect on the total nitrogen removal rate,while SDBS slightly inhibited the total nitrogen removal.The high-throughput sequencing results showed that both MWCNTs and SDBS reduced the number of microbial species,and had a significant impact on the microbial population structure.At the phylum level,the relative abundance of Chloroflexi and Nitrospirae decreased,while the relative abundance of Bacteroidetes increased.At the genus level,the relative abundance of Dechromonas decreased from 31％to around 20％,while MWCNTs alone increased the relative abundance of Zoogloea from 18％to 30％,and SDBS alone increased the relative abundance of Thauera from 10％to over 20％.Under the coexistence of the MWCNTs and SDBS,SDBS dominated the impact on microbial community structure.
multi-walled carbon nanotubesSDBSactivated sludgemicrobial community
万方数据
维普
