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Title: Streetley Chemicals/ Redland Bricks
Author: National Rivers Authority
Document Type: Monograph
Steetley Chemicals was recently taken over by Redland Bricks at a cost of 400 million pounds. One of the sites at Cranleigh has had a chequered past and due to mismanagement has a legacy of contaminated land, in particular high concentrations of Zinc, Bromates and other chemicals not desirable on any land or in any watercourse. Before Redland Bricks Ltd are able to divest the Cranleigh site certain environmental considerations must be taken into account to make it desirable to any prospective purchaser. This includes the treatment of any surface water off the site which inevitably washes out some of the contaminated material. The run off from the site is collected into a lower lagoon where it is treated to decrease the levels of toxicants to within the consent limits applied to the site, this is then discharged into the Collins Brook in the usual manner. An upper dilution lagoon (see diagram) is used to blend with the untreated effluent so that levels of contaminants may also be lowered and hence decrease the need for chemical treatment. Flocculation with lime and subsequent precipitation helps to rid the effluent of the high Zinc content, but the capacity for treatment is small. Redland Bricks have now decided that a reverse Osmosis plant (costing some 0.5 million pounds) will be necessary to treat the run off. At present the pilot plant can only deal with lnr/hour but when the plant is running at full capacity (August/September 1993) there will be the ability to deal with 5m3/hour.
Publisher: National Rivers Authority
Publication Date: 1992
Publication Place: [Bristol]
Subject Keywords: Flow rateChemical contaminationPollution controlIndustrial pollutantsEffluents
Geographic Keywords: Surrey
Extent: n.p. [31]
Total file downloads: 127

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