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《Transactions of the Chinese Society of Agricultural Engineering》 2009-S1
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Removal efficiencies of simulated mixed matrix vertical-flow constructed wetlands for wastewater effluent treatment

Zhu Wenling,Cui Lihua※,Zhu Xizhen,Tang Zhongen,Yu Zhiming (Department of Environmental Science and Engineering,South China Agricultural University,Guangzhou,510642,China)  
Two mixed substrates of vermiculite-slag and ceramic-slag were used in simulating vertical-flow constructed wetland for treating septic tanks effluent.The one-year operation results indicated that the purifying efficiencies of total nitrogen(TN),CODCr,NH4 +-N and total phosphorus(TP)by mixed substrate of vermiculite-slag were better than those of ceramic-slag,of which removal efficiencies of TP,TN,CODCr and NH4 + -N were higher than 71%,2.5%,61%and 65%,respectively.The hydraulic loading rate played a significant role in the wastewater purifying efficiency,and 30.6 cm·d -1 was the better loading rate for removing CODCr,NH4 + -N and TP than 61.2 cm·d -1 ,.In addition,mixed substrate of vermiculite-slag,with cannas planted,under hydraulic loading rate of 30.6 cm·d -1 ,and hydraulic retention time of 0.848d could achieve highest removal efficiencies of NH4 + -N,TP and CODCr,namely 94.51%,89.13%and 66.46%,respectively,which could all meet the first class B standards of Urban Waste Water Treatment Plant Pollutant Discharge Standard(GB18918-2002).
【Fund】: 国家自然科学基金项目(40571074 40871110 30828005);; 粤港招标(东莞专项)(2006168402)
【CateGory Index】: X703
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