Abstract
AbstractCompliance with the new trihalomethane standard is a major item in Yorkshire Water's water‐quality capital programme using conventional granular activated‐carbon filters as the final stage of treatment. Detailed investigations were carried out at three water‐treatment works to find an alternative solution which would ensure compliance at a lower cost and with minimum disruption to the existing treatment process. Low‐cost solutions were tailor made at each site, where possible modifying the existing process to improve the removal of organic material.The key to the success of this work was the use of ultraviolet light absorbance at 254 nm as a surrogate for precursors for the investigatory phase, making modifications easy and quick to evaluate, for modelling trihalomethane formation and, ultimately, by the plant engineer.
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