It has also been found that DMS did not show a decreasing trend with increasing biostability and oxygen content, inferring that its formation is mainly an abiotic process [ 13 , 30 ].
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Inhibitory Effects of the Addition of KNO<sub>3</sub> on Volatile Sulfur Compound Emissions during Sewage Sludge Composting.
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The arylsulfatase activity showed a trend of increasing and then decreasing and was the highest in the early stage of sewage sludge composting ( Figure 4 ).