Until recently, residents in a neighbour- hood in the city of Hobro, Denmark, were plagued by the smell of hydrogen sulphide. The odour problem came from manholes outside the city where a pumping main transports wastewater. The production of hydrogen sulphide in the pressurised pipes was so significant that concentrations of up to 500 ppm were measured in the manholes. In addition to the serious odour problems, hydrogen sulphide corrode

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