摘要
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 most common ways to treat wastewater. Implementation of long term sewage irrigation has an adverse impact on the quality of groundwater. Luancheng sewage irrigation area was chosen as the study area,and the environmental effects were studied by comparison of water quality indexes in sewage irrigation area and clear water irrigation area. The PCA method was used to study the contribution of sewage irrigation to pollutant compositions in groundwater. Results indicated that a long term sewage irrigation can change hydrochemical types of groundwater by increasing Cl^-and SO4^2-. Sewage irrigation had a huge impact on TDS,Cond,salty,water hardness,and the concentrations of Cr and Cd,which may lead to salt pollution and some of heavy metal pollution. The results of the PCA revealed that the contributions of different sources from high to low were in the rank of sewage irrigation,means of agricultural production,eluviation,industrial discharges.
出处
《环境科学与技术》
CAS
CSCD
北大核心
2016年第3期117-125,130,共10页
Environmental Science & Technology
基金
国家自然科学基金资助项目(41372252)
国家重点基础研究发展规划(2010CB428802)
国家高技术研究发展计划(2012AA062602)
国家水体污染控制与治理科技重大专项子课题(2012ZX07204-003-04)
关键词
污水灌溉
地下水水质
影响效应
栾城污灌区
sewage irrigation
groundwater quality
environmental effect
Luancheng sewage irrigation area
