Study on sand clogging in two-stage vertical flow constructed wetlands
Two small-scale plots and one pilot-scale system of two-stage vertical flow constructed wetlands were set up for testing the performance of rehabilitation of eutrophic shallow lakes. After three years operation with high hydraulic loadings, the systems faced the challenges of sand clogging and ponding. The clogged system showed a decrease in organic and nutrients removal, but an increase in TSS removal. The organic matter (OM) accumulated mainly at the surface and at the 0-50 mm upper layer in the downflow chamber, and there is a statistical significance between the substrate depth and the OM content on which is a negative correlation. In addition, the clogged system showed a decrease in infiltration rate, and the infiltration rate was correlated negatively to the OM content of the wetland system which suggested the OM accumulated in the substrate was an important reason for the system clogging.
Constructed wetlands infiltration rate organic matter accumulation sand clogging wastewater treatment
Lu XiuQing Zhan DeHao Wu ZhenBin
School of Environmental Science and Engineering,Huazhong University of Science and Technology,No.103 State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Acade
国际会议
北京
英文
1-4
2009-06-11（万方平台首次上网日期，不代表论文的发表时间）