人工湿地对滏阳河河水净化的试验研究

为了研究表面流人工湿地系统中不同植物对滏阳河受污染水体的净化作用,以表面流人工湿地系统为研究对象,分析研究系统中各植物对受污染滏阳河河水的处理效果。结果表明:湿地对亚硝酸盐氮、硝酸盐氮、TN、TP、CODMn、凯氏氮的平均去除率分别达到37.1%、26.3%、45.39%、57.8%、64.7%、43.9%,对受污染河水的净化效果显著。出水均达到GB 18918—2002Ⅲ类水排放标准,部分指标已达到一级A类标准。该成果可以应用到永年洼高效净污人工湿地系统示范工程中。通过分析发现部分指标的去除率较低,如硝酸盐氮的平均去除率仅为26.3%,故建议修建湿地系统示范性工程时使水流以S型向前推流,以增加水力停留时间,为各污染因子的吸收提供足够的反应时间,进而提高这些指标的去除率。

Experimental study on purification of Fuyanghe River water with artificial wetland

In order to study the purification effects of different plants in the artificial wetland system of surface flow on the polluted water in Fuyanghe River，the treatment effects of all the plants in the system on the polluted water in Fujanghe River are studied herein by taking the artificial wetland system of surface flow. The result shows that the mean removal rates of nitrite nitrogen， nitrate nitrogen，TN，TP，CODMn and Kjeldahl nitrogen got from the wetland reach to 37. 1% ，26. 3% ，45. 39% ，57. 8% ， 64. 7% and 43. 9% respectively，thus the purification effects on the polluted river water are significant; from which all the outflow water reaches the discharge standard of the water of Class Ⅲ defined in GB 18918—2002 and a part of the discharged water reaches to the standard for the Class A of the first-grade. The result can be applied to the demonstration project of Yongnianwa Artificial Wetland of efficient purification. Through the relevant analysis，it is found out that the removal rates of part of indexes are lower，e. g. the mean removal rate of nitrate nitrogen is only 26. 3% ，thus it is suggested to make the water therein flow forward with a type of S during the construction of the demonstration project of the wetland system，so as to increase the hydraulic residence-time for providing enough response time to absorb all the pollution factors concerned，and then to improve the removal rates of them.