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Type: Masters Coursework thesis × Subject: Aquifer Storage Recovery × Subject: Water management ×

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    Improving water quality through aquifer storage recovery
    Chan, Candice ( 2006)
    Aquifer Storage Recovery (ASR) is a technique used to store excess water in the sub-surface during periods of low demand for recovery during periods of high demand. Often, the excess water stored is treated effluent, and a secondary benefit of ASR is water quality improvement through reduction of disinfection-by products (DBPs) in this effluent. A review of published data from a number of ASR sites has found there are two processes dominating the DBP concentration of recovered groundwater from an ASR site: biodegradation of DBPs and DBP formation. Favourable conditions for biodegradation of DBPs are a redox environment that is highly reducing as well as the availability of sufficient dissolved organic carbon for microbial consumption. DBP formation during ASR can be reduced by limiting the organic carbon concentration and chlorine residual of the injected water.