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Davyhulme Sewage Works, 1935
Rapid aerobic nitrification of sewage
Edward Arden and W.T. Lockett of the Davyhulme Sewage Works in Manchester, England design an aerobic, aquatic, continuously flowing waste treatment process that can achieve complete and rapid nitrification of sewage. The success of the process depends on maintaining an optimal concentration of microorganisms to consume and convert carbonaceous materials into cell tissues and energy. This is accomplished by reusing portions of settled sludge. The process has been refined, but not surpassed.