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引用本文:童巍,朱伟,阮爱东.垂直流人工湿地填料的淤堵机理初探.湖泊科学,2007,19(1):25-31. DOI:10.18307/2007.0104
TONG Wei,ZHU Wei,RUAN Aidong.Primary study of clogging mechanisms of substrates in vertical flow constructed wetland. J. Lake Sci.2007,19(1):25-31. DOI:10.18307/2007.0104
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垂直流人工湿地填料的淤堵机理初探
童巍1, 朱伟1,2, 阮爱东2
1.河海大学环境科学与工程学院, 南京210098;2.水文水资源与水利工程科学国家重点实验室, 南京210098
摘要:
应用人工湿地技术处理污水时, 填料的淤堵往往是制约其处理功效和使用寿命的主要因素.本研究采用垂直流人工湿地单元模型, 通过测定填料有效孔隙率与截留SS总量、COD降解量、生物膜的增长量之间的关系, 初步探讨填料淤堵机理.结果表明:进水中悬浮颗粒全部为无机颗粒的系统较进水中全部为溶解态污染物质的系统更易造成淤堵, 进水中全部为溶解态污染物的系统至实验结束时未出现淤堵现象.淤堵发生后, 填料上层的渗透系数明显低于中下层, 表明淤堵主要发生在填料上层部分;截留的不可生物降解无机SS、被截留但未被降解的有机SS、生物膜的生长及老化脱落、以及被上述物质吸附的水是导致淤堵的主要原因.淤堵发生后, 湿地日污染物去除总量降低, 湿地功效受到影响.
关键词:  垂直流人工湿地  填料淤堵  湿地功效
DOI:10.18307/2007.0104
分类号:
基金项目:江苏省自然科学基金(BK2006170);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.
Primary study of clogging mechanisms of substrates in vertical flow constructed wetland
TONG Wei1, ZHU Wei1,2, RUAN Aidong2
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, Nanjing 210098, P.R.China
Abstract:
When constructed wetlands are applied in the sewage treatment, the clogging of substrates appears to be the primary limiting factor in its processing efficiency and the service life.In the present study, the clogging mechanism was primarily discussed by analyzing the relationships between the available porosity rate and SS, COD and the biomembrane growth in the vertical flow constructed wetland (VCW) unit models.The results indicated that the inorganic SS resulted in the clogging of substrates easier than the organic SS to create.There was no clogging phenomena in the system with the soluble pollutants in influent.When the clogging was present, the penetration coefficient in upper part became obviously smaller than that of the middle and lower part, indicating that the clogging mainly occured in the upper part.The main reasons for the clogging of substrates were the temporarily intercepted inorganic SS, which could not be biodegradated, the intercepted organic SS that hadn't been biodegradated in time, the growing and falling-off of biomembranes, as well as the water adsorbed by those above materials.The pollutants removal quantities per day reduced as the clogging appeared, and the wetland efficiency was affected.
Key words:  Vertical flow constructed wetland  clogging of the substrate  wetland efficiency
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