多壁碳纳米管和十二烷基苯磺酸钠对SBR运行性能及微生物种群结构的影响  

Effects of multi-walled carbon nanotubes and sodium dodecylbenzenesulfonateon the performance and microbial community of SBR

作　　者：冯楚娴 李梅 文慧 杨晓慧 林金融 卢韦灼 孙嘉阳 李宜泽 裴建川 FENG Chuxian;LI Mei;WEN Hui;YANG Xiaohui;LIN Jinrong;LU Weizhuo;SUN Jiayang;LI Yize;PEI Jianchuan(College of Environment and Resources/College of Carbon Neutrality,Zhejiang A&F University,Hangzhou 311300,China)

机构地区：[1]浙江农林大学环境与资源学院/碳中和学院,杭州311300

出　　处：《环境工程学报》2024年第6期1480-1488,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金资助项目(21607132);浙江农林大学国家级大学生创新创业训练计划项目(202210341012);浙江农林大学校级科研训练项目(S202210341170);浙江省“尖兵”“领雁”研发攻关计划项目(2024C03249)。

摘　　要：随着多壁碳纳米管(multi-walled carbon nanotubes, MWCNTs)的广泛应用,其进入污水处理系统后可能对活性污泥系统产生影响。表面活性剂是污水中的常见污染物,MWCNTs对表面活性剂的吸附可能会改变MWCNTs对活性污泥系统的影响。为探明MWCNTs和表面活性剂对活性污泥系统的影响及机制,以十二烷基苯磺酸钠(sodium dodecylbenzene sulfonate, SDBS)为表面活性剂代表,研究MWCNTs和SDBS单独和共同存在条件下对序批式活性污泥反应器(sequencing batch reactor, SBR)运行性能及微生物种群结构的影响。结果表明:SBR连续运行22 d期间,SDBS和MWCNTs对系统COD去除率有不同程度的增强,MWCNTs对总氮去除率影响不大,而SDBS对总氮去除有轻微抑制。高通量测序结果表明:MWCNTs和SDBS均降低了微生物物种数量,并对微生物种群结构造成显著影响,门水平上,Chloroflexi(绿弯菌门)和Nitrospirae(硝化螺旋菌门)相对丰度下降,而Bacteroidetes(拟杆菌门)相对丰度增加,属水平上,Dechloromonas(脱氯单胞菌属)相对丰度从31%下降至20%左右,MWCNTs单独存在使得Zoogloea(动胶菌属)相对丰度从18%增加到30%,而SDBS存在使得Thauera(陶厄氏菌属)相对丰度从10%增加到20%以上。两者共存条件下,SDBS对微生物种群结构影响占主导地位。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^(3)1%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.

关 键 词：多壁碳纳米管 SDBS 活性污泥 微生物种群 

分 类 号：X703[环境科学与工程—环境工程]