| 铁改性石英砂过滤协同控制饮用水含氮消毒副产物和条件致病菌 |
| 摘要点击 3093 全文点击 997 投稿时间：2021-06-11 修订日期：2021-07-17 |
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| 中文关键词 铁改性石英砂(Fe-sand) 含氮消毒副产物(N-DBPs) 条件致病菌 胞外多聚物 微生物群落 |
| 英文关键词 iron-modified quartz sand nitrogenous disinfection by-products opportunistic pathogens extracellular polymer substances microbial community |
| 作者 | 单位 | E-mail | | 齐鹏 | 广州大学大湾区环境研究院, 珠江三角洲水质安全与保护教育部重点实验室, 广州 510006 | 1642700757@qq.com | | 胡春 | 广州大学大湾区环境研究院, 珠江三角洲水质安全与保护教育部重点实验室, 广州 510006
中国科学院生态环境研究中心饮用水科学与技术重点实验室, 北京 100085 | | | 邢学辞 | 广州大学大湾区环境研究院, 珠江三角洲水质安全与保护教育部重点实验室, 广州 510006 | xcxing@gzhu.edu.cn | | 毕志浩 | 广州大学大湾区环境研究院, 珠江三角洲水质安全与保护教育部重点实验室, 广州 510006 | | | 李泽松 | 广州大学大湾区环境研究院, 珠江三角洲水质安全与保护教育部重点实验室, 广州 510006 | |
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| 中文摘要 |
| 石英砂在给水工艺中最主要的作用为去除浊度，其固-液界面的微生物作用受到忽视.为了解决普通石英砂（sand）在控制消毒副产物和条件致病菌有限的问题，将普通石英砂改性为铁改性石英砂（Fe-sand），用气相色谱-ECD测定了典型含氮消毒副产物（N-DBPs）和含碳消毒副产物的最大生成势.结果表明，Fe-sand对卤代硝基甲烷，卤乙酰胺和卤乙腈生成的抑制效果分别提升了51.51%、43.66%和90.6%.此外，基于定量qPCR检测了Hartmanella vermiformis、Legionella spp.、Mycobacterium spp.、M.avium和Naegleria spp.的基因拷贝数，发现Fe-sand对条件致病菌同样有显著地抑制作用.Fe-sand对NOM的去除提升能力有限，但Fe-sand滤料表面生物膜分布较为均匀、不易脱落且更稳定，其出水悬浮态生物膜则较难聚集，胞外蛋白α螺旋二级结构消失，因而极容易被氯穿透，有效抑制了出水中生物膜对N-DBPs和条件致病菌的持续贡献.Fe-sand固-液界面显著改变了微生物群落和悬浮生物膜的形态，对保障饮用水水质安全提供了新的思路，对水厂现有工艺的提升和改造起到良好的理论支撑作用. |
| 英文摘要 |
| The main function of quartz sand in drinking water treatment has been to remove turbidity, while the microbial effect of its solid-liquid interface has been ignored. In order to solve the limitations of control of the disinfection by-products (DBPs) and opportunistic pathogens (OPs) in common quartz sand, the common quartz sand was modified to iron sand. The maximum DBPs formation potential of typical nitrogenous disinfection by-products (N-DBPs) and carbonaceous disinfection by-products was determined using gas chromatography-ECD. Compared with those of sand, the inhibition effects of halonitromethanes, haloacetamides, and haloacetonitriles by the Fe-sand were increased by 51.51%, 43.66%, and 90.6%, respectively. In addition, the gene copy numbers of Hartmanella vermiformis, Legionella spp., Mycobacterium spp., M. avium, and Naegleria spp. were detected via quantitative qPCR, and the results indicated that the Fe-sand did have a similar significant inhibitory effect on OPs. The Fe-sand had limited ability to enhance the removal of NOM. However, the Fe-sand effectively inhibited the continuous contribution of biofilm to N-DBPs and opportunistic pathogens. The distribution of biofilms on the surface of the Fe-sand filter media was uniform, not likely to fall off, and more stable; however, the suspended biofilms in the effluent were more difficult to aggregate. In addition, the α-helix of the secondary structure in the extracellular protein disappeared in the effluent of the Fe-sand. Therefore, the whole suspended biofilm was easily penetrated by chlorine. The Fe-sand solid-liquid interface did significantly change the microbial community structure and suspended biofilm characteristics, which provides a new concept to ensure the safety of drinking water quality and plays a good theoretical supporting role in the improvement and transformation of the existing process in drinking water treatment plants. |
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