Trichloroacetaldehyde in Water Supplies
ISBN: 1 84057 044 X
The objective of this work was to survey trichloroacetaldehyde (TCAL) concentrations in final waters from a selection of water treatment works acrtoss the UK. The selection covered a wide range of raw water types and treatment conditions. The results were compared to the provisional WHO guideline of 10 ug/ 1 in order to determine whether this value is likely to be exceeded in practice. The survey indicated that TCAL only exceeded the guideline value at a few works, one works exceeded this value by a considerable amount. One resampling at this works the concentration of TCAL was well below the provisional value. No clear explanation was obtained for these high concentrations of TCAL. In general concentrations were found to be low, with most having concentrations of less than 20% of the provisional guideline value. It was therefore considered that TCAL concentrations would not be aproblem for most treatment works. A few treatment works may experience concentrations close to or exceeding the guideline level.
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