The superintendent of a conventional activated-sludge plant receives complaints from nearby residents and businesses about odors, particularly in the summer. After a comprehensive field investigation, the major sources were found to be emissions of predominantly hydrogen sulfide from the grit chamber and primary clarifiers. Apparently, in the summer, convection lifts the foul air over the bushes and trees in the buffer zone and in the summer people are more likely to be outside or have their windows open. Recommend alternative schemes for containing and cleansing the foul air before it is released to the atmosphere.
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