Hydrogen sulphide has the potential to form in most sewer systems due to bacterial action when oxygen is limited. The consequences of sulphide generation range from odour complaints to corrosion in the sewer main and/or at the inlet works of the treatment plant. Oxygen injected into the main, treats the cause of the problem ensuring the bacteria have sufficient dissolved oxygen for aerobic respiration. Hence anaerobic conditions and consequent generation of sulphides do not occur.

This paper outlines oxygen control strategies and the variety and application of available oxygen dissolving systems. To achieve the most efficient and cost effective oxygen control of sulphides, a holistic approach is used to model the entire sewerage network.

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