H2S Logger Successful in Sewage Treatment Trials The BACKGROUND The project was run by Cobra Hydro, a leading odour consultant and odour abatement chemical manufacturer. The PROBLEM The trial site at a sewage treatment works in Essex has, for many years been a problematic site from a point of view for odour management and control. The site receives and processes sludge from Southend Sewage Treatment Works which is extremely sceptic and has controlled odours by a combination of liquid dosing and dry scrubbing technologies. The liquid dosing is intended to reduce the sulphide levels to an acceptable level prior to the dry scrubbing system so that the final scrubbing leaves a gas stream in a non-noxious state. Prior to these trials, Cobra Hydro carried out some odour logging with the RTx Odal

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