微电解耦合人工湿地处理农村分散式污水

Microelectrolysis Coupled Constructed Wetland for Rural Distributed Wastewater Treatment

选用风车草为湿地植物,以铁碳构建微电解耦合人工湿地基质层与普通人工湿地进行对比。结果表明,上升流和复合流2种微电解耦合人工湿地系统比普通人工湿地污染物去除率明显要高,且在夏秋季启动时间要缩短25%以上。升流垂直流微电解耦合人工湿地可承受有机负荷可达HJ 2005-2010垂直流人工湿地设计规范中最大有机负荷的300%左右,相较于普通人工湿地有了很大提高。当升流垂直流微电解耦合人工湿地停留时间为2 d时,系统出水COD即可达到GB 18918-2002一级排放A标准;停留时间为3 d时PO_4^(3-)去除率接近90%,且出水稳定达到GB 18918-2002一级排放A标准,而普通人工湿地3 d仍没有达标。复合垂直流潜流人工湿地比升流式微电解耦合人工湿地对于COD、PO_4^(3-)的去除率再高出1%~9%,但成本也更高。

The cyperus alternifolius was selected as wetland plant, micro-electrolysis coupled constructed wetland was built with iron-carbon and which was compared with normal constructed wetland. The results showed that, the pollutant removal rate of both the upwelling and the hybrid flow constructed wetland were higher than normal constructed wetland, and the startup time would shorten 25% in summer and autumn. Flow-upward vertical micro- electrolysis coupled constructed wetlands could withstand organic loads up to about 300% of the maximum organic load in the design code for vertical flow constructed wetlands of HJ 2005- 2010, which is greatly improved compared to normal constructed wetlands. When the residence time of flow- upward vertical micro-electrolysis coupled constructed wetlands was 2 d, the effluent COD could reach the first discharge A standard of GB18918--2002. When the residence time was 3 d, the PO43- removal rate was close to 90%, and the effluent reached the first discharge A standard of GB 18918 -- 2002, while the normal constructed wetland still did not reach the standard after 3 d. The hybrid vertical subsurface flow constructed wetlands had a higher removal rate of COD and PO43 of 1%--9% than the flow-upward micro-electrolysis coupled constructed wetlands constructed wetlands, but the cost was higher.