Formation of H2S and other odorous compounds in sludge can be prevented efficiently by controlled dosage of nitrate. Lillehammer WWTP (N) had problems with malodour that originated mainly from the sludge treatment. Highlevels of H2S caused poor working conditions, and resulted in an overloaded hypochlorite scrubber. In addition, neighbours were complaining. Controlled dosing was necessary to avoid increased loads on the nitrogen removal process and floating sludge in the thickener, and to keep the H2S concentration and chemical costs low. This resulted in considerably better working environment and eliminated complaints from neighbours. A cost-benefit for Nutriox® Septicity Control has been performed.
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Einarsen et al. (2000) studied this question.
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