Ling Chengpeng, Zhang Qiang
State Key Laboratory of Geohazard Prevention and Geoenvironment Protection (Chengdu University of Technology), 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, People's Republic of China.
Chengdu University of Technology, 1#, Dongsanlu, Erxianqiao, Chengdu, 610059, People's Republic of China.
Environ Monit Assess. 2017 Apr;189(4):140. doi: 10.1007/s10661-017-5832-7. Epub 2017 Mar 3.
As a primary disposal mean of municipal solid waste in China, the landfill has been recognized as one of the major threats to the surrounding surface water and groundwater environment due to the emission of leachate. The aim of this study was to determine the impact of leachate on the surface water and groundwater environment of the region of the Chang'an landfill, which is located in Sichuan province, China. The surface water and groundwater were sampled for hydrochemical analysis. Three electrical resistivity tomography profiles were conducted to evaluate the impact of leachate on the groundwater environment, and several laboratory tests were carried out to build the relationship between the soil bulk resistivity and the void fluid resistivity. The results showed that a seasonal creek named Longfeng creek, which crosses the landfill site, was contaminated by the leachate. The concentrations of COD, BOD5, and chlorides (Cl) of surface water samples increased by 12.3-105.7 times. The groundwater quality in the surface loose sediments along the valley deteriorated obviously from the landfill to 500 m downstream area. The laboratory tests of soil samples indicated that the resistivity value of 13 Ωm is a critical value whether the groundwater in the loose sediments is polluted. The groundwater at the site adjacent to the spillway in the landfill was partially contaminated by the emission of leachate. The groundwater contamination zones at 580 m downstream of the landfill were recognized at the shallow zones from 60 m left bank to 30 m right bank of Longfeng creek. The improved understanding of groundwater contamination around the landfill is beneficial for the landfill operation and groundwater environment remediation.
作为中国城市生活垃圾的主要处置方式，填埋场因其渗滤液的排放而被认为是对周边地表水和地下水环境的主要威胁之一。本研究的目的是确定渗滤液对位于中国四川省长安填埋场所在区域的地表水和地下水环境的影响。采集地表水和地下水样本进行水化学分析。进行了三条电阻率层析成像剖面测量，以评估渗滤液对地下水环境的影响，并开展了多项实验室测试，以建立土壤体积电阻率与孔隙流体电阻率之间的关系。结果表明，一条穿过填埋场的季节性小溪——龙凤溪受到了渗滤液的污染。地表水样本中的化学需氧量（COD）、生化需氧量（BOD5）和氯化物（Cl）浓度增加了12.3至105.7倍。沿山谷的地表松散沉积物中的地下水质量从填埋场到下游500米区域明显恶化。土壤样本的实验室测试表明，13Ωm的电阻率值是判断松散沉积物中的地下水是否受到污染的临界值。填埋场溢洪道附近场地的地下水受到渗滤液排放的部分污染。在龙凤溪左岸60米至右岸30米的浅层区域识别出了填埋场下游580米处的地下水污染带。对填埋场周围地下水污染的深入了解有利于填埋场运营和地下水环境修复。
