铁炭内电解垂直流人工湿地对污水厂尾水深度脱氮效果  

Removal of Nitrogen in Municipal Secondary Effluent by a Vertical Flow Constructed Wetland Associated with Iron-carbon Internal Electrolysis

作　　者：郑晓英[1] 朱星[1] 周翔[1] 徐亚东[2] 王菊[2] 韦诚[2] 高雅洁[1] 周橄 

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,南京210098 [2]江苏省水资源服务中心,南京210029

出　　处：《环境科学》2017年第6期2412-2418,共7页Environmental Science

基　　金：江苏省水利科技项目(2015027);江苏省自然科学基金项目(BK20161505);中央高校基本科研业务费专项(2015B16414);江苏高校优势学科建设工程项目(PAPD)

摘　　要：针对污水厂尾水总氮(TN)含量偏高、微生物可利用碳源低的问题,构建铁炭内电解垂直流人工湿地(ICIE-VFCW)装置,研究了ICIE-VFCW对尾水的处理效果,并采用紫外-可见光光谱(UV-VIS)、凝胶过滤色谱(GFC),进一步探讨了ICIEVFCW强化脱氮机制.结果表明,ICIE-VFCW可提高系统对尾水中COD的去除,出水COD可稳定在30 mg·L^(-1)以下,全年、暖季、寒季COD平均去除率较普通垂直流人工湿地分别可提高10.16%、9.81%、11.22%.系统出水TN可维持在10 mg·L^(-1)以下,全年、暖季、寒季TN平均去除率较普通垂直流人工湿地分别提高13.72%、12.90%、16.17%.经过人工湿地处理后,污水中有机物的腐殖度、芳香度及相对分子质量(Mr)均有所下降,且ICIE-VFCW中Mr下降更为明显.湿地基质掺杂铁炭可促进尾水中大分子有机物转化为小分子,为微生物提供更多可利用碳源,从而提高脱氮效率.Aiming at the problem of high concentration of total nitrogen （TN） and low available carbon source for microorganisms in municipal secondary effluent, the vertical flow constructed wetland associated with iron-carbon internal electrolysis （ICIE-VFCW） was applied to investigate the removal efficiencies of pollutants in municipal secondary effluent. Moreover, the mechanism for enhanced nitrogen removal was primarily discussed by the applications of UV visible spectrum （UV-VIS） and gel filtration chromatography （GFC）. The results showed that the ICIE-VFCW could improve the COD removal efficiencies and the effluent COD of less than 30 mg·L-1could be stably obtained. The average COD removal efficiencies of the whole year, warm months, and cold months could be increased by 10.16%, 9.81%, 11.22%, respectively, compared to the control group. The effluent TN of the ICIE-VFCW could be maintained below 10 mg·L-1, and the average TN removal efficiencies of the whole year, warm months and cold months could be increased by 13.72%,12.90%,16.17%, respectively. Besides, compared to the influent, the humification, aromaticity and average relative molecular weight （Mr） in the effluent obviously decreased, and the Mr decreased more significantly in the ICIE-VFCW. The ICIE-VFCW could promote the conversion of refractory organics in municipal secondary effluent to the small and readily biodegradable molecules, which could enhance the utilization of organic compounds by microorganisms, thus improving the removal efficiency of nitrogen.

关 键 词：污水厂尾水 垂直流人工湿地 铁炭内电解 深度脱氮 相对分子质量分布 

分 类 号：X703.1[环境科学与工程—环境工程]