Hydrological buffering during groundwater acidification in rapidly industrializing alluvial plains

Xu, Beiyi1,2,4; Wang, Guangcai1; Yang, Qiang2; Zheng, Yan2,3

2018-11

10.1016/j.jconhyd.2018.08.006

JOURNAL OF CONTAMINANT HYDROLOGY   影响因子和分区

0169-7722

1873-6009

Shallow groundwater in alluvial plains is vulnerable to contamination due to infiltration of pollutants from anthropogenic activities. In the alluvial plain of the Yangtze River near Poyang Lake, a silicone monomer industrial park was found to discharge undisclosed amount of effluents containing high levels of hydrochloric acid and total dissolved solids into ponds and ditches that in turn, displayed characteristics of acidic water with high total dissolved solids. However, most shallow groundwater (n = 35, depth 5.5-22 m) collected from the alluvial aquifer downgradient of the industrial park contained low Cl- (< 59 mg/L). Only 4 groundwater samples showed high Cl- (59-790 mg/L) with two containing superlative levels (449 mg/L and 790 mg/L) located within a 50 m distance from the polluted ponds and ditches. In addition to hydrochemical data, modeling was used to explain why a highly vulnerable alluvial aquifer was not more contaminated when subjected to such intense point source pollution and to estimate the effluent discharge. Flow and solute transport modeling suggests that a hydrological buffering mechanism resulting from a topography driven groundwater outflow along the boundary between the Pleistocene (Qpw) and the Holocene (Qhl) aquifers where the polluted ponds and ditches are fortuitously located has restricted acid infiltration, with only a few percent of the estimated acid discharge in the amount of 1700-4200 tons per year entering the aquifer. Our model results show that pumping from the upland Qpw aquifer breaks this hydrological buffering much more easily than pumping from the downgradient Qhl aquifer, suggesting the vulnerability of this buffering mechanism thus compromising groundwater utilization in the future.

Alluvial plain aquifer Groundwater acidification Hydrological buffering Chloride Poyang Lake

SCI ; EI

英语

通讯

Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control[2017B030301012]

Environmental Sciences & Ecology ; Geology ; Water Resources

Environmental Sciences ; Geosciences, Multidisciplinary ; Water Resources

WOS:000451103200003

ELSEVIER SCIENCE BV

20183705803597

Acidification ; Aquifers ; Chlorine compounds ; Effluents ; Groundwater resources ; Hydrogeology ; Infiltration ; Lakes ; River pollution ; Silicones ; Solute transport ; Water analysis

Groundwater:444.2 ; Industrial Wastes:452.3 ; Water Pollution:453 ; Geology:481.1 ; Organic Polymers:815.1.1 ; Food Processing Operations:822.2 ; Classical Physics; Quantum Theory; Relativity:931 ; Materials Science:951

ENVIRONMENT/ECOLOGY

Web of Science

1.China Univ Geosci, State Key Lab Biogeol & Environm Geol, Sch Water Resources & Environm, Beijing 100083, Peoples R China
2.Columbia Univ, Lamont Doherty Earth Observ, Palisades, NY 10964 USA
3.Southern Univ Sci & Technol, Guangdong Prov Key Lab Soil & Groundwater Pollut, Shenzhen 518055, Guangdong, Peoples R China
4.Nanjing Tech Univ, Coll Transportat Sci & Engn, Nanjing 210009, Jiangsu, Peoples R China

Xu, Beiyi,Wang, Guangcai,Yang, Qiang,et al. Hydrological buffering during groundwater acidification in rapidly industrializing alluvial plains[J]. JOURNAL OF CONTAMINANT HYDROLOGY,2018,218:19-33.

Xu, Beiyi,Wang, Guangcai,Yang, Qiang,&Zheng, Yan.(2018).Hydrological buffering during groundwater acidification in rapidly industrializing alluvial plains.JOURNAL OF CONTAMINANT HYDROLOGY,218,19-33.

Xu, Beiyi,et al."Hydrological buffering during groundwater acidification in rapidly industrializing alluvial plains".JOURNAL OF CONTAMINANT HYDROLOGY 218(2018):19-33.