植草沟对农村污水水质净化效果的研究

The Effect of Grass Planting-Ditch on Rural Sewage Purification

植草沟对农村污水水质净化效果仍不清楚。为定量化评价植草沟对农村污水的净化效果,以厦门市英村为典型研究区,随机选取三处污水点,进行野外采样和室内试验,每次采样和实验均重复3次。分别测定BOD5、COD、氨氮、总氮和总磷的经过15和30 cm土柱的前后变化。结果显示,植草沟厚度为15 cm时,对BOD5、COD、氨氮、总氮和总磷的去除率为39.3%、52.0%、53.9%、36.2%、85.1%,且可完成大部分去除效果;植草沟厚度为30 cm时,对BOD5、COD、氨氮、总氮和总磷的去除率为56.0%、67.5%、64.8%、43.7%、64.6%。可见30 cm厚度的植草沟其净化效果的70%是在0~15 cm之间完成。植草沟对农村污水的净化效果明显,是改造硬化排污沟渠和改善农村生态环境的一种有效方式。

The effect of grass planting ditch on rural sewage purification is still unclear. In order to quantitatively evaluate the purification effect of grass planting ditch on rural sewage, three sewage points are randomly selected in Yingcun of Xiamen City for field sampling and indoor test, and sampling and experiment are repeated three times. The changes of BOD5, COD, ammonia nitrogen, TN and TP after 15 and 30 cm soil columns are measured. The results show that the removal rates of BOD5, COD, ammonia nitrogen, TN and TP were 39.3%, 52.0%, 53.9%, 36.2% and 85.1%, and most of them could be removed when the thickness of the swale was 15 cm;the removal rates of BOD5, COD, ammonia nitrogen, TN and TP were 56.0%, 67.5%, 64.8%, 43.7% and 64.6% when the thickness of the swale was 30 cm. It can be seen that 70% of the purification effect of 30 cm thick grass planting ditch is completed between 0~15 cm, and less than 30% in the range of 15~30 cm.Grass planting ditch has obvious purification effect on rural sewage, which is an effective way to transform and harden the drainage ditch and improve the rural ecological environment.