摘要
2002年8月～12月对长江口南汇潮滩湿地处理系统对污水净化效果进行了研究,分析了潮滩沉积物中N、P含量变化及其与功能细菌含量间的关系,以及芦苇对污染物质的直接去除作用。结果表明:潮滩湿地对污水的净化效果显著,对TN、TP和COD的去除率分别达到94.06%,76.82%和92.47%;沉积物中N、P含量随样点与排污口间距离增大呈下降趋势;沉积物中NH4+—N、NO3-—N、DIP含量与功能细菌数量间呈良好的正相关;收割芦苇去除的N、P量分别只占全年排入湿地总量的2.201×10-5%、4.552×10-4%。潮滩湿地对污染物的去除主要通过:潮汐稀释转移,沉降,滩面沉积物吸附等物理过程和微生物分解等生物过程的综合作用,而潮滩植物的直接去除作用仅占很小部分。
Purification effects of coastal wetland to wastewater were studied during August to December 2002 at Nanhui Beach, Estuary of the Yangtze River. Concentration variation of nitrogen and phosphorus and relationship to corresponding functional bacteria content in the sediment, as well as the directly removal of pollution of Phragmites australis harvesting were analyzed. Results showed the wetland purification effect to wastewater was distinct, and purification efficiency to TN, TP and COD in wastewater were 94.06%, 76.82% and 92.47% respectively; the nitrogen and phosphorus concentration in sediment declined with the distance to the increased outfall; NH_4^+-N,NO_3^--N and dissolved inorganic phosphorus in the sediment have mostly positive relationship with corresponding functional bacteria amount. The directly nitrogen and phosphorus removal by P. australis harvesting only account for 2.201×10^(-5)% TN and 4.552×10^(-4)% TP of annual inflow to the wetland. Wastewater purification in the beach wetland includes physical process such as dilution and removal by tide, sedimentation, sediment adsorption and biological process as microorganism decomposing. The directly removal effect of beach vegetation is very limited.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2005年第3期3-5,共3页
Environmental Science & Technology
基金
国家自然科学基金重点项目(40131020)
科技部基础性工作和社会公益研究专项(2003DIB4J129)
关键词
长江口
潮滩湿地
污水净化
沉积物
水质
芦苇
estuary of the Yangtze River
coastal wetland
wastewater purification
sediment
water quality
Phragmites australis
