Analysis for remedial alternatives of unregulated municipal solid waste landfills leachate-contaminated groundwater

doi:10.1007/s11707-013-0374-y

Front Earth Sci

2013, Vol. 7

Issue (3) : 310-319 https://doi.org/10.1007/s11707-013-0374-y

RESEARCH ARTICLE

Analysis for remedial alternatives of unregulated municipal solid waste landfills leachate-contaminated groundwater

Da AN^1,2, Yonghai JIANG², Beidou XI²(

), Zhifei MA², Yu YANG², Queping YANG², Mingxiao LI², Jinbao ZHANG², Shunguo BAI², Lei JIANG²

1. School of Environment, Beijing Normal University, Beijing 100875, China; 2. State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China

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Abstract

A groundwater flow and solute transport model was developed using Visual Modflow for forecasting contaminant transport and assessing effects of remedial alternatives based on a case study of an unregulated landfill leachate-contaminated groundwater in eastern China. The results showed that arsenic plume was to reach the pumping well in the downstream farmland after eight years, and the longest lateral and longitudinal distance of arsenic plume was to reach 200 m and 260 m, respectively. But the area of high concentration region of arsenic plume was not to obviously increase from eight years to ten years and the plume was to spread to the downstream river and the farmland region after 20 years; while the landfill’s ground was hardened, the plume was not to reach the downstream farmland region after eight years; when the pumping well was installed in the plume downstream and discharge rate was 200 m³/d, the plume was to be effectively restrained; for leakage-proof barriers, it might effectively protect the groundwater of sensitive objects within an extent time range. But for the continuous point source, the plume was still to circle the leakage-proof barrier; when discharge rate of drainage ditches was 170.26 m³/d, the plume was effectively controlled; the comprehensive method combining ground-harden with drainage ditches could get the best effect in controlling contaminant diffusion, and the discharge rate was to be reduced to 111.43 m³/d. Therefore, the comprehensive remedial alternative combining ground-harden with drainage ditch will be recommended for preventing groundwater contamination when leachate leakage has happened in unregulated landfills.

Keywords unregulated landfill groundwater numerical simulation contaminant transport arsenic remedial alternative

Corresponding Author(s): XI Beidou,Email:anda7977@hotmail.com

Issue Date: 05 September 2013

Cite this article:

Beidou XI,Zhifei MA,Yu YANG, et al. Analysis for remedial alternatives of unregulated municipal solid waste landfills leachate-contaminated groundwater[J]. Front Earth Sci, 2013, 7(3): 310-319.

URL:

https://academic.hep.com.cn/fesci/EN/10.1007/s11707-013-0374-y
https://academic.hep.com.cn/fesci/EN/Y2013/V7/I3/310

Fig.1 Layout sketch of the study site.

Tab.1 Primary geological layers distribution of the study site

Tab.2 Parameters of the groundwater flow model

Fig.2 Match of the observed and calculated (a) groundwater level and (b) arsenic concentration.

Fig.3 Tendency of arsenic transport in the water-table aquifer for (a) five years, (b) eight years, (c) ten years and (d) 20 years.

Fig.4 Tendency of arsenic transport by hardening ground after eight years.

Fig.5 The remedial effect of the arsenic plume under the pumping well’s discharge rate of 100 md and pumping time of (a) ten years and (b) 20 years, 200 md and pumping time of (c) ten years and (d) 20 years and 300 mdand pumping time of (e) ten years and (f) 20 years.

Fig.6 Tendency of the arsenic transport by installing leakage-proof barrier for (a) ten years and (b) 20 years.

Fig.7 Tendency of the arsenic plume transport by installing the 80m length drainage ditch after 20 years.

Fig.8 Remedial effect of optimized method by combining ground harden with drainage ditches after 20 years.

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