Basically in a situation ...

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Basically in a situation where there is a lack of dissolved oxygen in the wastewater which is normal depending on the sewer design anaerobic organisms will start to strip oxygen from whatever source they can. If there is a lot of sulphate in the water this can lead to SO2 and ultimately to H2S formation. The if we could get this to happen with drinking water without having to add organics it would be a lot easier to reduce nitrate concentrations