The paper gives reasons for and an overview of the septicity and odour control efforts of Anglian Water Services. It outlines the chemicals available and indicates some practical dosages. A comparison is given of types and number of installations and changes which have taken place since 1979. The paper describes an example of bioaugmentation to control hydrogen sulphide formation and the effective use of bioscrubbers and ozone for the treatment of malodorous air. Treatment costs are discussed. It is concluded that our better understanding of the mechanisms involved has led to an increase in the use of nitrate salts. A combination of chemical dosing systems may be necessary to prevent septicity and eliminate malodorous compounds.

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