The Hutt Valley Drainage Board Milliscreen Treatment Plant, commissioned in July 1984, treats municipal waste using 0.5mm and 1.0mm wedgewire single pass rotary screens. The plant is designed to remove all gross solids not readily assimilated by the sea and is an alternative to primary treatment prior to discharge into coastal waters via a marine outfall. This paper describes the plant and background to the investigations, pilot plant studies, design, and operational data available to date. Milliscreening as a pretreatment option for marine disposal is also discussed.

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