香根草和风车草人工湿地对猪场废水氮磷处理效果的研究

分别以香根草 (Vetiveriazizanioides )和风车草 (Cyperusalternifolius)为植被 ,按 1.0m× 0 .5m×0 .8m建立人工湿地 ,通过四季测试研究其对猪场废水N、P的净化功能及其随季节、进水浓度及水力停留时间变化的规律 .结果表明 ,两湿地对NH3 N和S PO3 -4 去除率受污水停留时间和污水浓度影响较大 .香根草或风车草人工湿地在春季对NH3 N和S PO3 -4 有明显的去除效果 ;在秋季 ,则对去除废水TN均有效果 ,在去除TP上 ,香根草湿地效果明显 ,风车草湿地效果差 .秋春季人工湿地随水力停留时间 (t)延长 ,TP或S PO3 -4 (Y)的去除遵从指数方程Yt=Y0 ·e-kt规律 .冬季和夏季 ,进水浓度对湿地去除P影响较大 ;在相同停留时间内 ,冬夏季人工湿地随进水浓度变化 ,进出水S PO3 -4 遵从直线方程 y =a +bx规律

Effects of constructed wetlands on treating with nitrogen and phosphorus in wastewater from hoggery

Using plant species Vetiveria zizanioides (VCWS) and Cyperus alternifolius (CCWS) respectively, two constructed wetlands (CWS) with size of 1.0 m x 0.5 m x 0.8 m were established. The purifying function and its change pattern among different seasons, influent concentration and hydraulic retention time (HRT) of CWS on nitrogen and phosphorus in wastewater from a hoggery was studied throughout four seasons in the year. The results showed that the effects of HRT and wastewater concentration on the removal rate of NH3-N and S-PO4(3-) were obvious in both VCWS and CCWS. High removal rates of NH3-N and S-PO4(3-) were obtained in CCWS and VCWS in spring. Significant removal of TN in wastewater existed in CCWS and VCWS in autumn, while significant removal of TP in wastewater existed only in VCWS. The removal of TP or S-PO4(3-) against the HRT in CWS followed exponential function. The rates of P removal in winter and summer changed with the influent concentrations. Under the same HRT, the change of S-PO4(3-) concentrations in outflow against the influent concentration followed a linear relationship.