Abstract
AbstractThe paper outlines the commissioning, performance trials, and operational experience of the direct‐filtration process at the Yau Kom Tau treatment works in Hong Kong.The commissioning tests established the capability of the treatment plant to produce water of the required potable quality. However, the contractual performance trials were carried out at a time when adverse raw water might be expected, in order to assess the overall attainment of guarantees on the treated water quality, filter run, and washwater percentage.Since the works became operational in November 1985, a number of incidents of raw water quality outside the design limits have been experienced. The use of polyelectrolyte was found to enhance the performance and reliability of the direct‐filtration process.The paper also reports the results of some optimization tests and comments on the overall performance of the plant compared with expectations at the time of design.
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