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内电解人工湿地冬季低温尾水强化脱氮机制
摘要点击 1831  全文点击 620  投稿时间:2017-04-14  修订日期:2017-08-23
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中文关键词  冬季低温  污水厂尾水  人工湿地脱氮  内电解  湿地微生物
英文关键词  low temperature in winter  municipal secondary effluent  denitrification of constructed wetland  internal electrolysis  microbial characteristic
作者单位E-mail
郑晓英 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, 南京 210098 zhxyqq1118@163.com 
朱星 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, 南京 210098  
王菊 江苏省水资源服务中心, 南京 210029  
周翔 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, 南京 210098  
徐亚东 江苏省水资源服务中心, 南京 210029  
韦诚 江苏省水资源服务中心, 南京 210029  
高雅洁 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, 南京 210098  
周橄 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, 南京 210098  
中文摘要
      针对湿地冬季运行效率低、污染物去除能力差,本研究通过对比无植物湿地、普通湿地和内电解湿地冬季低水温下(3~12℃)对污水厂尾水的脱氮效能,深入分析其微生物群落结构组成,揭示内电解湿地的强化脱氮机制.结果表明,内电解湿地可以更好地利用尾水中碳源,脱氮效果优势明显,出水TN浓度维持在(9±0.29)mg·L-1,TN平均去除率达42.27%,比无植物湿地和普通湿地分别高出17.91%、17.33%.冬季低温条件下,内电解湿地微生物活性仍很高,荧光显色法测得微生物活性达到0.224 mg·g-1,分别是无植物湿地和普通湿地的2.6、3.4倍,反硝化强度分别是无植物湿地和普通湿地的2.8、3.3倍.高通量测序表明,内电解湿地基质微生物群落多样性优于无植物湿地和普通湿地.检测出的脱氮微生物主要有脱氯单胞菌、根瘤菌、生丝微菌、红杆菌,还有自养反硝化细菌产硫酸杆菌.内电解湿地在脱氮微生物总量上有明显优势,脱氮微生物占微生物总量的7.13%,分别是无植物湿地、普通物湿地的3.8、8.7倍,因而脱氮效率更高.
英文摘要
      Aiming at the low pollutant removal efficiency of constructed wetlands (CWs) at low temperature in winter, three laboratory-scale vertical-flow CWs, namely unplanted CWs, ordinary CWs, and internal-electrolysis CWs, were used to investigate the nitrogen removal efficiency of municipal secondary effluent when the water temperature was 3-12℃. Moreover, the mechanism of enhanced denitrification of the new wetland was revealed through analysis of the microbial community diversity and community structure. The results showed that the internal-electrolysis CWs could make better use of the carbon sources in the municipal secondary effluent and had a higher removal rate. The effluent TN concentration was maintained at about (9±0.29) mg·L-1. The average TN removal rate was 42.27%, which was 17.91% and 17.33% higher than those of the unplanted CWs and ordinary CWs, respectively. The microbial activity was detected using fluorescein diacetate (FDA), and the result revealed that the microbial activity of the internal-electrolysis CWs could reach 0.224 mg·g-1, which was 2.6 times and 3.4 times of that of the unplanted CWs and ordinary CWs, respectively. The microbial denitrification intensity of the internal-electrolysis CWs was 2.8 times and 3.3 times of that of the unplanted and ordinary CWs, respectively. The results of high-throughput sequencing showed that the microbial community diversity of the internal electrolysis CWs was higher than those of the unplanted and ordinary CWs. Denitrification microorganisms were detected, mainly Dechloromonas, Rhizobium, Hyphomicrobium, and Rhodobacter, as well as Thiobacillus, which is an autotrophic denitrifying bacterium. There were obvious advantages in the total amount of denitrifying microorganisms in the internal-electrolysis CWs, as the denitrification microorganisms accounted for 7.13% of the total microbial biomass, which was 3.8 times and 8.7 times of that of the unplanted CWs and ordinary CWs, respectively.

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