[1]郑晓英,徐智,张远,等.纳米氧化铈对好氧污泥颗粒化进程的影响[J].中国给水排水,2022,38(3):21-28.
　ZHENGXiao-ying,XUZhi,ZHANGYuan,et al.Effect of Cerium Oxide Nanoparticles on Aerobic Granulation Process[J].China Water & Wastewater,2022,38(3):21-28.
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纳米氧化铈对好氧污泥颗粒化进程的影响

中国给水排水[ISSN:1000-4062/CN:12-1073/TU] 卷: 第38卷 期数: 2022年第3期 页码: 21-28 栏目: 出版日期: 2022-02-01
Title:
Effect of Cerium Oxide Nanoparticles on Aerobic Granulation Process
作者:
郑晓英， 徐智， 张远， 杨萌萌， 邵晓瑶， 朱灵华
（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）
Author(s):
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）
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
Keywords:
cerium oxide nanoparticles (CeO2 NPs);  sequencing batch reactor;  aerobic granular sludge;  granulation;  nitrogen and phosphorus removal
摘要:
采用序批式反应器（SBR），研究不同浓度的纳米氧化铈（CeO2 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，CeO2 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，CeO2 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CeO2 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CeO2 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。
Abstract:
Effects of different concentrations of cerium oxide nanoparticles (CeO2 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 CeO2 NPs concentrations of 0 mg/L, 1 mg/L and 5 mg/L) after 28 d, 24 d and 21 d, respectively. Although CeO2 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 CeO2 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 CeO2 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 to 10.63% and 5.97%, respectively, indicating that the denitrification and phosphorus accumulation processes of granular sludge were inhibited.

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更新日期/Last Update: 2022-02-01