复合垂直潜流人工湿地处理低温生活污水的研究

探讨复合垂直潜流人工湿地用于处理北方农村地区低温生活污水的效果.为获得潜流人工湿地运行与管理的有效方法,从水力停留时间和水力负荷率方面探讨系统对COD、NH3-N、TN和TP的去除效果.研究发现,当水力停留时间在72～96 h时,各项水质指标的去除率较高,NH3-N和TN的去除率为37.6％和35.3％.当水力负荷率在1.0m3/(m2·d)时,水质指标均有较高的去除效果,COD和TP的去除效果分别能达到79.5％和66.7％.通过增加污水回流提高湿地对有机物、氨氮及总氮的去除率,最佳回流比为1.同时对比研究了系统抵御温度变化的能力,分析了温度降低对水质处理效果的影响.

Treatment of domestic wastewater under low temperature by hybrid vertical subsurface flow constructed wetland

This study evaluates the treatment effectiveness of hybrid vertical subsurface flow constructed wetland to the domestic wastewater under low temperature in northern country of China. In order to get effecitive methods for operations and managements, the removal rates of COD, NH3--N, TN, and TP are analysed in terms of hydraulic retain time （HRT） and hydraulicload rate （HLR）. When the HRT at about 72-96 h, all the four indexs have good removal rates with 37.6% of NH3-N and 35.3G of TN. At the same time , they also can get effective removal ratio with 79.5% of COD and 66.7% of TP while the HLR at 1.0 m^3 / （m^2 · d）. It can be found that addiational wastewater reflux is helpful for the removal of organic matters , ammonia nitrogen and total nitrogen. The optimum reflux ratio is 1. In the meantime, the results that the wetland withsand temperature＇ s change are also indicated by the analysis of effects of temperature reducement to removal rates.