稻田湿地处理农村生活污水除磷试验研究

Study on Phosphorus Removal of Rural Domestic Wastewater With the Paddy Wetland

在水稻的一个生长周期内进行了稻田湿地处理农村生活污水除磷的田间试验。结果表明,五个处理出水中的TP去除率顺序为:GW(98.17%)】DW(97.28%)】BW(97.04%)】SW(96.78%)】CK(75.20%)。同时,GW、DW和BW处理中来自农村生活污水中磷的去除率(60.3%~71.4%)显著性(P≤0.05)高于化肥磷的去除率(26.8%~36.7%),表明相对于磷肥,农村生活污水中磷的形态更易于被稻田湿地去除。随着水稻的生长,磷素从根部分别向茎部、叶部迁移,最后在谷籽中富积。另外,五个处理的水稻产量差异不显著(P≤0.05),说明采用农村生活污水替代地表水灌溉稻田湿地可在保证产量的同时高效除磷。

The results from the phosphorus-removal field experiment of rural domestic wastewater treatment by the paddy wetland showed that phosphorus removal rates were in the following order at: GW(98.17%)>DW(97.28%)>BW(97.04%)>SW(96.78%)>CK(75.20%).Phosphorus removal rates from rural domestic wastewater(60.3%~71.4%) was significantly higher than that from P fertilizer(27.5%~32.7%)(P≤0.05),which showed that P from rural domestic wastewater was removed preferentially.P transferred from roots to stems and leaves with the rice growth,and finally accumulated in the grains.In addition,the rice yields of five treatments had not significant difference(P≤0.05),which suggested irrigating the paddy wetland by rural domestic wastewater instead of surface water could effectively remove P and keep the rice yields simultaneously.