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Title: Sandon dock wastewater treatment works : outfall survey October 1992
Author: National Rivers Authority North West Region
Document Type: Monograph
The pollution resulting from the discharge of sewage and industrial effluent to the Mersey has been a long standing problem. The scale was such that in 1982, 48 outfalls were discharging crude sewage from Liverpool, Sefton and Wirral into the lower estuary (Alexander, 1982). To alleviate this situation a number of sites were proposed for new sewage treatment works, including a reclaimed island in the estuary between Eastham and Garston (Watson, 1974). By 1978, an outfall culvert routed through Alexandra Dock had become the favoured option with a preliminary assessment of possible problems (Hydraulics Research Station, 1978). In 1979 Hydraulics Research carried out surveys in the Canada Deep (see figure 1 ) on spring and neap tides which concluded that in this locality there was no significant time at which the depth averaged ambient velocity was zero (Hydraulics Research Station, 1979). During the planning investigations, the Liverpool North Docks site became available. This waterfront site with the advantages of minimum costs for Interceptor sewers and effluent outfall, and ideally located for transporting sludge for sea disposal became the focus for a new sewage treatment works. Planning permission to build a sewage treatment plant on the site was granted in 1980. This report summarises a survey carried out with the following objectives: 1) to determine the impact on the receiving waters of the present arrangement of 'through the wall' discharge; 2 ) to determine whether an outfall to deeper water is necessary; 3) to assess the hardware and methodology of a new data logging system supplied by Norcom Technology Ltd.
Publisher: National Rivers Authority
Publication Date: 1993
Publication Place: Warrington
Subject Keywords: EstuariesWater qualitySewage treatmentImprovement
Geographic Keywords: EA North WestMersey Estuary catchment
Extent: 31
Total file downloads: 293

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