不同湿地植物对扎染废水处理效果的研究

分别以芦苇、美人蕉、菖蒲和水芹菜为湿地植物来构建垂直潜流人工湿地系统,研究其对扎染废水的处理效果.结果表明,在相同进水浓度下,芦苇湿地系统的出水COD平均浓度最低,仅为25.7 mg/L;美人蕉湿地系统的出水氨氮和TN平均浓度最低,分别为0.96和4.25 mg/L;水芹菜湿地系统的出水TP平均浓度最低,仅为0.09 mg/L.综合考虑可知,芦苇和美人蕉对扎染废水的处理能力较强.4种植物对扎染废水均具有较好的处理效果,湿地出水的各项指标均优于<城镇污水处理厂污染物排放标准>(GB 18918-2002)的一级A标准.

Treatment of Tie-dyeing Wastewater by Vertical Subsurface-flow Constructed Wetlands with Different Plants

Vertical subsurface-flow constructed wetlands with Phragmites communis, Canna generalis, Acorus calamus and Oenanthe javanica as vegetation were built to study the treatment effect of tie-dyeing wastewater. The experimental results show that under the same influent conditions, the effluent COD concentration of constructed wetland with Phragmites communis is lowest, at 25.7 mg/L; the effluent NH_4~+-N and TN concentrations of constructed wetland with Canna generalis are lowest, at 0.96 mg/L and 4.25 mg/L respectively; the effluent TP concentration of constructed wetland with Oenanthe javanica is lowest, at 0.09 mg/L. The comprehensive consideration suggests that Phragmites communis and Canna generalis are more suitable for treatment of tie-dyeing wastewater, while all four plants have excellent treatment effects. The pollutant indexes in the effluent are better than the first level criteria specified in Discharge Standard of Pollutants for Municipal Wastewater Treatment Plant (GB 18918-2002).