Inhibitory Effects of the Addition of KNO on Volatile Sulfur Compound Emissions during Sewage Sludge Composting.

Odor released from the sewage sludge composting process often has a negative impact on the sewage sludge treatment facility and becomes a hindrance to promoting compost technology. This study investigated the effect of adding KNO on the emissions of volatile sulfur compounds, such as hydrogen sulfide (HS), dimethyl sulfide (DMS), and carbon disulfide (CS), during sewage sludge composting and on the physicochemical properties of compost products, such as arylsulfatase activity, available sulfur, total sulfur, moisture content, and germination index. The results showed that the addition of KNO could inhibit the emissions of volatile sulfur compounds during composting. KNO can also increase the heating rate and peak temperature of the compost pile and reduce the available sulfur loss. The addition of 4% and 8% KNO had the best effect on HS emissions, and it reduced the emissions of HS during composting by 19.5% and 20.0%, respectively. The addition of 4% KNO had the best effect on DMS and CS emissions, and it reduced the emissions of DMS and CS by 75.8% and 63.0%, respectively. Furthermore, adding 4% KNO had the best effect from the perspective of improving the germination index of the compost.