多级表面流人工湿地/氧化塘工艺处理微污染原水

Combined Process of Multi-surface Flow Constructed Wetland and Oxidation Pond for Treatment of Micro-polluted Raw Water

采用多级表面流人工湿地/氧化塘工艺处理鱼塘养殖和农业生产的微污染排水,着重考察了湿地系统的除污效果。结果表明,湿地系统的净化效果明显,在监测时段内对COD、TN、NO 3--N、NO 2--N、TP和可溶性总磷的平均去除率分别为53.7%、45.0%3、4.0%、54.5%、48.7%和50.5%,系统出水水质满足水域功能区标准的要求。随着温度的升高,对COD、TN和TP的去除率逐渐增大,且在30.2～31.4℃时去除率出现了陡增。人工湿地系统进水TN负荷与TN去除率之间的相关性不强(R2=0.617 4),而进水TP负荷与TP去除率之间的相关性较好(R2=0.913 0)。表面流人工湿地系统具有投资少、处理效果好、运行管理简单等优点,在削减入湖污染负荷上有很好的应用前景。

The combined process of multi-surface flow constructed wetland and oxidation pond was used to treat micro-polluted raw water from fish pond aquaculture and agricultural production, and the pollutant removal effect of the constructed wetland was investigated. The results show that the treatment effect of micro-polluted raw water by wetland system is very significant. In the whole monitoring period, the average removal rates of COD, TN, NO3 - N, NO2 - N, TP and soluble TP are 53.7% , 45.0% , 34.0%, 54.5%, 48.7% and 50.5% respectively. The quality of the final effluent meets the standard of water environmental function area. As temperature is increased, the removal rates of COD, TN and TP are increased. In particular, their removal rates are increased sharply at 30.2℃ to 31.4 ℃. For the constructed wetland, there is a poor correlation between TN load and removal rate （R2 = 0.617 4 ）, but there is a good correlation between TP load and removal rate （R2 = 0. 913 0）. Because of less invest- ment, good effect, simple operation and management, the surface flow constructed wetland system has a good application prospect in reduction of pollution load into the lake.