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  1. Sewage Treatment 1 (1992 Video)

    Subject
    Chemistry; Environmental science
    Distribution
    Sale, Videocassette. VHS. col. 22 min., 1997 sale: £28.75 (+VAT +p&p)

    Looks at the technical response to changing community standards on sewage treatment: 40 years ago - public health (primary treatment - screening, settling, anaerobic digestion, chlorination); 20 years ago -...

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  2. Water Management (2 Parts) (1977 Film, Video)

    Director
    Brian Spencer
    Producer
    Brian Spencer
    Subject
    Environmental science
    Distribution
    Film (16mm)

    Part 1: To maintain the quality of mains water, collected, treated and distributed by the water authorities requires close control of waste water discharges by industry at all stages. Costs of supplying and...

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