纳米氧化铈对好氧污泥颗粒化进程的影响  

Effect of Cerium Oxide Nanoparticles on Aerobic Granulation Process

作　　者：郑晓英[1] 徐智 张远 杨萌萌 邵晓瑶 朱灵华 ZHENG Xiao-ying;XU Zhi;ZHANG Yuan;YANG Meng-meng;SHAO Xiao-yao;ZHU Ling-hua(Key Laboratory of Integrated Regulation&Resource Development on Shallow Lakes,College of Environment,Hohai University,Nanjing 210098,China)

机构地区：[1]河海大学环境学院浅水湖泊综合治理与资源开发教育部重点实验室,江苏南京210098

出　　处：《中国给水排水》2022年第3期21-28,共8页China Water & Wastewater

基　　金：国家自然科学基金资助项目(51678214);国家重点研发计划项目(2016YFC0400804);江苏省自然科学基金资助项目(BK20161505);江苏高校优势学科建设工程资助项目(PAPD)。

摘　　要：采用序批式反应器(SBR),研究不同浓度的纳米氧化铈(CeO_(2)NPs)对好氧污泥颗粒化的影响机制。结果表明,3个反应器(R0、R1、R2,CeO_(2)NPs浓度分别为0、1、5 mg/L)中好氧颗粒污泥出现的时间分别为28、24、21 d,CeO_(2)NPs的投加虽然能在短时间内刺激胞外聚合物(EPS)的分泌进而促进颗粒污泥的形成,但纳米材料的毒性会抑制微生物的生长,使得污泥结构松散且含水量大,最终颗粒污泥稳定时间分别为40、46和56 d。当成熟好氧颗粒污泥暴露于1、5 mg/L的CeO_(2)NPs环境时,其脱氮除磷能力会受到较大影响,总氮去除率分别比空白组低5.96%和11.49%,总磷去除率分别比空白组低16.79%和23.59%。通过高通量测序发现,当CeO_(2)NPs浓度为5 mg/L时,反硝化功能菌Thermomonas和Flavobacterium的相对丰度分别从空白组的2.16%和1.88%降至1.55%和1.27%,聚磷菌Burkholderia和Acinetobacter的相对丰度分别从空白组的15.86%和9.33%降至10.63%和5.97%,说明颗粒污泥的反硝化和聚磷过程受到了抑制。Effects of different concentrations of cerium oxide nanoparticles (CeO_(2)NPs) on aerobic granulation were investigated in a sequencing batch reactor (SBR).Aerobic granular sludge appeared in the three reactors (R0,R1 and R2 with CeO_(2)NPs concentrations of 0 mg/L,1 mg/L and 5 mg/L) after 28d,24 d and 21 d,respectively.Although CeO_(2)NPs stimulated the secretion of extracellular polymer substrate (EPS) in a short time and promoted the formation of granules,the toxicity of nano-material inhibited the growth of microorganisms,resulting in loose granular structure and high water content of sludge.As a result,the granular sludge eventually stabilized after 40 d,46 d and 56 d,respectively.When the mature aerobic granular sludge was exposed to CeO_(2)NPs with concentrations of 1 mg/L and 5 mg/L the nitrogen and phosphorus removal efficiency were greatly affected.The total nitrogen removal efficiency of R1 and R2 was 5.96%and 11.49%lower than that of R0,and the total phosphorus removal efficiency of R1 and R2 was 16.79%and 23.59%lower than that of R0,respectively.When the dosage of CeO_(2)NPs was 5 mg/L,the relative abundance of the denitrifying bacteria Thermomonas and Flavobacterium decreased from 2.16%and 1.88%in the blank group to 1.55%and 1.27%respectively and the relative abundance of Burkholderia and Acinetobacter decreased from 15.86%and 9.33%in R0 to10.63%and 5.97%,respectively,indicating that the denitrification and phosphorus accumulation processes of granular sludge were inhibited.

关 键 词：纳米氧化铈 序批式反应器 好氧颗粒污泥 颗粒化进程 脱氮除磷 

分 类 号：TU992[建筑科学—市政工程]