摘要:
采用水平潜流人工湿地系统处理微污染原水，同时考察了水力停留时间、温度、水力负荷以及植物的生长状况等对人工湿地系统处理效果的影响。结果表明，水平潜流人工湿地系统对微污染原水有较好的处理效果，COD、TP、TN、NH+4-N、NO-3-N和NO-2-N的平均去除率分别为51.55%、49.90%、51.74%、 47.36%、52.67%和63.23%。按照国家地表水环境质量标准（GB3838-2002），经过湿地处理后，出水COD平均值达到Ⅰ类；出水TP平均值达到Ⅱ类；出水TN平均值基本接近Ⅳ类；出水NH+4-N平均值达到Ⅱ类。另外，研究表明, 本系统在水力停留时间为3 d时,水力负荷为0.2 m/d处理效果最好，温度的变化与污染物的去除率呈正相关关系，植物生长旺盛程度直接影响着整个系统的处理效果。
Abstract:
The horizontal subsurface flow constructed wetland was used to treat micropolluted raw water, and the influences of hydraulic retention time, temperature, hydraulic load and the growth of plants on the constructed wetland’s treatment effect were investigated. The results show that the horizontal subsurface flow constructed wetland performs well on the treatment of the micropolluted raw water, the average removal rates of COD, TP, TN, NH+4-N, NO-3-N, NO-2-N are 51.55%, 49.90%, 51.74%, 47.36%, 52.67% and 63.23% respectively. According to the China Standard for Surface Water Resources (GB3838-2002), after the treatment of the wetland, mean effluent COD can reach nearly GradeⅠ. Mean effluent TP can reach GradeⅡ. Mean effluent TN can nearly reach GradeⅣ. Mean effluent NH+4-N can nearly reach GradeⅡ. Otherwise, the research also shows that when the hydraulic retention time is 3 d, and the hydraulic load is 0.2 m/d the wetland system has the best treatment effects. The change of the temperature is positively correlated with the removal rates of the pollutants. The growth degree of the plants affects the treatment effects of the whole system directly.
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