论文部分内容阅读
污灌是污水最终处置的常见方式之一,长期开展污水灌溉将对地下水水质造成影响。以栾城地区为研究实例,首先通过对比污灌区及清灌区各项水质指标的差异,分析污水灌溉对地下水水质的影响效应。在此基础上,运用主成分分析法对地下水污染组分的主要物源进行解析,明确污灌对于地下水污染组分的贡献程度。结果表明:长期污水灌溉会使地下水中Cl-及SO_4~(2-)组分含量显著增加,从而改变地下水化学类型;污水灌溉对地下水TDS、电导率、盐度、硬度等指标,以及Cr、Cd等组分含量都具有显著影响,会造成盐污染及部分重金属污染。主成分分析结果显示,各物源对地下水化学组分的贡献率由大至小排序依次为:污水灌溉、农业生产资料施放、矿物淋溶作用、其他作用。
Sewage irrigation is one of the common ways of final disposal of sewage. Long-term sewage irrigation will have an impact on groundwater quality. Taking Luancheng area as an example, this paper first analyzes the effect of wastewater irrigation on groundwater quality by comparing the difference of water quality indicators in sewage irrigation area and irrigation area. On this basis, using principal component analysis to analyze the main source of groundwater pollution components, clarify the contribution of sewage irrigation to groundwater pollution components. The results showed that the long-term sewage irrigation could significantly increase the content of Cl- and SO_4 2- in groundwater and change the chemical type of groundwater. The index of TDS, conductivity, salinity and hardness of groundwater, Cd and other components have a significant impact on the content will cause salt pollution and some heavy metal pollution. The principal component analysis showed that the contribution rates of various provenances to the chemical components of groundwater were ranked as follows: sewage irrigation, application of agricultural means of production, mineral leaching and other functions.