Hydrogeochemistry Evidence for Impacts of Chemical Acidic Wastewater on Karst Aquifer in Dawu Water Source Area, Northern China

Henghua Zhu, Jianwei Zhou, Zhizheng Liu, Lizhi Yang and Yunde Liu
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Henghua Zhu: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Jianwei Zhou: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China
Zhizheng Liu: Shandong Institute of Geological Survey, Jinan 250000, China
Lizhi Yang: Shandong Institute of Geological Survey, Jinan 250000, China
Yunde Liu: School of Environmental Studies, China University of Geosciences, Wuhan 430074, China

IJERPH, 2021, vol. 18, issue 16, 1-10

Abstract: The study of the hydrochemical characteristics and the water–rock interaction of karst groundwater is very important for the rational exploitation of karst groundwater and its pollution control. In this paper, the systematic clustering method was used to analyze the hydrochemical characteristics of different types of groundwater, combined with hydrochemical graphic analysis and correlation analysis to explore the impact of chemical acidic wastewater on the evolution of karst aquifer in the Dawu water source area, northern China. The results show that the chemical acid wastewater, sourcing from discharges/spillages from the local chemical industries, has different degrees of pollution impact on karst groundwater, causing the total hardness of all karst groundwater and the total dissolved solids, Cl ? and SO 4 2? in nearly half of the karst groundwater to exceed the quality indexes of class III water in China’s standard for groundwater quality (GB/T 14848-2017). Hydrochloric acid and sulfuric acid in the wastewater can be buffered by the dissolution of carbonate rocks, resulting in a nearly neutral pH (pH-buffering effect) and an increase in Ca 2+ , Mg 2+ , Sr, Cl ? and SO 4 2? concentrations in karst groundwater.

Keywords: groundwater; karst aquifer; hydrogeochemistry; groundwater quality; pollution (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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