农村生活污水土地处理对土壤理化性质的影响

Effect of Rural Sewage Treatments on Soil Physicochemical Properties

地下升流式高效土地自然净化技术在处理农村生活污水的同时,利用上部覆土层种植作物做到土地综合利用。本文利用该技术处理东大寨村生活污水的工程设施研究其对土壤质量的影响。通过对系统顶部覆土层土壤理化性质分析结果表明:污水处理在一定程度上造成了耕作层土壤容重逐渐增加,孔隙度逐渐减小,田间持水量降低;随着土层深度的增加,土壤pH值有增加的趋势;土壤盐分出现了明显累积;阳离子交换量(CEC)和有机质含量也明显增加。说明污水处理在一定程度上能提高土壤的肥力水平,增强保肥能力和缓冲性能,顶部覆土层种植农作物可产生一定的经济效益,地下升流式高效土地自然净化技术可以在农村推广应用。

Abstact： Upflow high efficiency natural land purification technology is used in the rural sewage treatment,and the up layer soil is used for planting crops as a comprehensive utilization of land.The technology is used to study the effects of the system on soil quality,which is utilized in Dongdazhai Village.Based on analysis of the top layer soil physicochemical properties in the system,the bulk density increase,porosity decrease and field capacity decrease were to some extent caused by the treatment;which caused pH increased with the depth grows;The salinity accumulated,and the increase of CEC and organic matter content were very significantly.It suggets the treatment can improve the soil fertility to a certain extent,by enhancing fertilizer retention property and acid-buffer ability.Economic benefits can be generated by planting crops on the top layer soil,and the technology is feasible to promote in rural areas.