Comparative Evaluation of the Fate of Disinfection Byproducts at Eight Aquifer Storage and Recovery Sites

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• 作者：Paul Pavelic ; Peter J. Dillon ; and Brenton C. Nicholson
• 刊名：Environmental Science & Technology
• 出版年：2006
• 出版时间：January 15, 2006
• 年：2006
• 卷：40
• 期：2
• 页码：501 - 508
• 全文大小：331K
• 年卷期：v.40,no.2(January 15, 2006)
• ISSN：1520-5851

文摘

Despite the growth in aquifer storage and recovery (ASR)as a technique for the provision of potable water supplies,quantitative data on the fate of disinfection byproducts thatmay be present in the injected water remain rare. Thisstudy evaluates the data from eight ASR sites in Australiaand the United States that cover a wide range of sourcewater compositions, hydrogeological environments, andoperating conditions. Rates of attenuation and formation oftrihalomethanes (THMs) in groundwater were determinedusing analytical techniques that took dilution effectsinto account. Half-lives varied by more than 2 orders ofmagnitude (e.g., <1 to >120 days for total THMs) and wereboth compound- and site- specific. Chloroform was mostpersistent, and more highly brominated compounds tendedto be less persistent, as has generally been found. Forany particular THM compound, much of the variability couldbe explained by contrasts in geochemical conditionswithin the aquifer since microbial degradation is the primarymechanism for THM attenuation. As such, bounds onthe half-life were defined according to the redox state ofthe groundwater. In situ formation of some THMs in theaquifer after injection was directly observed at a numberof sites, and was predicted to have taken place at allsites. The variance in formation estimates was large betweenthe different methods used. Formation may be morecommon than previously thought because of the lowfrequency of groundwater sampling after injection andconcomitant attenuation and mixing.