Abstract

Managed aquifer recharge (MAR) using urban stormwater facilitates relieving water supply pressure, restoring the ecological environment, and developing sustainable water resources. However, compared to conventional water sources, such as river water and lake water, MAR using urban stormwater is a typically intermittent recharge mode. In order to study the clogging and water quality change effects of Fe, Zn, and Pb, the typical mental pollutants in urban stormwater, a series of intermittent MAR column experiments were performed. The results show that the type of pollutant, the particle size of the medium and the intermittent recharge mode have significant impacts on the pollutant retention and release, which has led to different clogging and water quality change effects. The metals that are easily retained in porous media have greater potential for clogging and less potential for groundwater pollution. The fine medium easily becomes clogged, but it is beneficial in preventing groundwater contamination. There is a higher risk of groundwater contamination for a shallow buried aquifer under intermittent MAR than continuous MAR, mainly because of the de-clogging effect of porous media during the intermittent period.

Highlights

  • Managed aquifer recharge (MAR) is part of the palette of solutions to water shortage, water security, water quality decline, falling water tables, and endangered groundwaterdependent ecosystem [1]

  • Compared with continuous MAR, we mainly explore the clogging and water quality change effects of typical metal pollutants, under intermittent MAR, using urban storm

  • Compared with continuous MAR, we mainly explore the clogging and water quality change effects of typical metal pollutants, under intermittent MAR, using urban stormwater

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Summary

Introduction

Managed aquifer recharge (MAR) is part of the palette of solutions to water shortage, water security, water quality decline, falling water tables, and endangered groundwaterdependent ecosystem [1]. E.g., municipal and industrial wastewater, that could be reclaimed, urban stormwater, as a MAR water source, has particular advantages, namely renewability and lower pollution degree [4,5], which make its usage more economical and sustainable. Many countries, such as Australia, the United States, and India, have successfully adopted stormwater as the recharge water source [6,7]. Common problems in MAR, using urban stormwater, include clogging of the filter media and water quality deterioration [8]. Clogging occurs when the permeability of the filter media decreases due to physical, chemical, and biological processes during recharge

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