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引用本文:赵建,朱伟,赵联芳.人工湿地对城市污染河水的净化效果及机理.湖泊科学,2007,19(1):32-38. DOI:10.18307/2007.0105
ZHAO Jian,ZHU Wei,ZHAO Lianfang.Efficiency and mechanism of treating the polluted river water with constructed wetland. J. Lake Sci.2007,19(1):32-38. DOI:10.18307/2007.0105
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人工湿地对城市污染河水的净化效果及机理
赵建1, 朱伟1,2, 赵联芳1,2
1.河海大学环境科学院与工程学院, 南京210098;2.河海大学水文水资源与水利工程科学国家重点实验富, 南京210098
摘要:
针对采用人工湿地系统净化镇江市内污染较为严重的古运河河水中遇到的问题, 采用复合垂直流人工湿地小试装置, 研究人工湿地系统对污染河水的净化效果及净化机理.镇江古运河水质调查结果表明, 河水中悬浮态污染物质含量较高, 为劣Ⅴ类水体;当水力负荷为750mm/d时, 人工湿地系统对CODMn去除率约为50%-60%, TN去除率约为40%-50%, TP去除率约为30%-40%, 能够将劣Ⅴ类水处理为Ⅳ类水甚至Ⅲ类水, 表明其对污染河水处理的有效性.研究人工湿地内部污染物浓度的沿程变化规律, 可以发现河水中污染物质的去除主要发生在湿地下行池, 尤其是表层30cm处, 而上行池未能发挥应有的作用, 分析表明与可能与污染河水中的碳氮比有一定的关系.通过本次实验发现湿地表层对污染物的去除表现为滤料及植物根系的过滤、吸附、截留以及微生物的降解、植物吸收等综合作用.
关键词:  人工湿地  悬浮态污染物  溶解态污染物  沿程变化
DOI:10.18307/2007.0105
分类号:
基金项目:江苏省自然科学基金(BK2006710);国家“十五”重大科技专项“863”镇江城市水环境质量改善与生态修复综合示范项目(2003AA601100)联合资助
Efficiency and mechanism of treating the polluted river water with constructed wetland
ZHAO Jian1, ZHU Wei1,2, ZHAO Lianfang1,2
1.College of Environmental Science and Engineering, Hohai University, Nanjing 210098, P.R.China;2.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University, Nanjing 210098, P.R.China
Abstract:
Aiming at the problem which was faced at the time of treating the seriously polluted water in the Old Canal of Zhenjiang by the constructed wetland, the removal efficiency and the mechanism of treating the polluted river water by the integrated vertical-flow constructed wetland were studied.The investigation of the water quality of the Old Canal showed that the suspended pollutant concentrations was higher and the water quality was worse than Grade V;When the hydraulic loading of the integrated vertical-flow constructed wetland (IVCW) was about 750 mm/d, the removal rates of the CODMn, TN and TP were respectively from 50% to 60%, from 40% to 50%, and from 30% to 40% and the effluent quality can reach the Grade Ⅳ even Ⅲ.it showed that the IVCW was a valid method to the treatment of the polluted river water.The variation of the pollutant concentration along the flow showed that the pollutant was removed mainly by the down-flow chamber, especial the surface layer (0-30 cm), while the function of the up-flow chamber was little which may have relation to C/N.The removal function of the surface layer was mainly by the filtration of the medium and plant roots, the degradation of the microorganism, and the absorption of the plants.
Key words:  construct wetland  suspended pollutant  dissolved pollutant  variation along the flow
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