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38. Inhibitory Effects of Appropriate Addition of Zero-Valent Iron on NH 3 and H 2 S Emissions during Sewage Sludge Composting.

Author

Liu, Yuan, Liu, Junwan, Zheng, Guodi, Yang, Junxing, and Cheng, Yuan

Subjects
SLUDGE composting, SEWAGE sludge, COMPOSTING, IRON, WOOD waste, POLLUTION
Abstract

Large amounts of NH3 and H2S are emitted during sewage sludge composting, resulting in odor pollution. This composting experiment was carried out using sewage sludge mixed with sawdust, and different amounts of zero-valent iron (ZVI) were added to investigate the effect on volatile gases, such as NH3 and H2S, and to analyze the effect on the available sulfur, total sulfur, moisture content, and germination index of the compost. The results showed that the addition of ZVI during the composting process had noticeable effects on the emission of NH3 and H2S. ZVI could also increase the heating rate and peak temperature of the pile, reduce the available sulfur loss, and promote the dewatering and decomposition of the compost pile. The addition of 3% ZVI had the best effect on NH3 emissions; it reduced the peak concentration of NH3 release during composting by 21.0% compared to the blank group. However, the addition of 2% ZVI was the most effective for H2S emissions; it reduced the peak release concentration of H2S by 20.0%. A higher addition of ZVI was more effective in reducing the moisture content and increasing the germination index of the compost. [ABSTRACT FROM AUTHOR]

Published
2022
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40. Inhibitory Effects of the Addition of KNO 3 on Volatile Sulfur Compound Emissions during Sewage Sludge Composting.

Author

Zheng, Guodi, Liu, Yuan, Li, Yongjie, Liu, Junwan, and Yang, Junxing

Subjects
*SLUDGE composting, *COMPOSTING, *SEWAGE sludge, *SLUDGE management, *SULFUR compounds, *DIMETHYL sulfide, *CARBON disulfide, *HYDROGEN sulfide
Abstract

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 KNO3 on the emissions of volatile sulfur compounds, such as hydrogen sulfide (H2S), dimethyl sulfide (DMS), and carbon disulfide (CS2), 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 KNO3 could inhibit the emissions of volatile sulfur compounds during composting. KNO3 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% KNO3 had the best effect on H2S emissions, and it reduced the emissions of H2S during composting by 19.5% and 20.0%, respectively. The addition of 4% KNO3 had the best effect on DMS and CS2 emissions, and it reduced the emissions of DMS and CS2 by 75.8% and 63.0%, respectively. Furthermore, adding 4% KNO3 had the best effect from the perspective of improving the germination index of the compost. [ABSTRACT FROM AUTHOR]

Published
2022
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46. Effects of nitrogen and phosphorus additions on soil organic carbon and nitrogen mineralization and hydrolase kinetics in Chinese fir plantations

Author

郑国砥 Zheng Guodi, 聂二旗 Nie Erqi, 陈伏生 Chen Fusheng, 孙晓敏 Sun Xiaomin, 王辉民 Wang Huimin, 张心昱 Zhang Xinyu, and 杨洋 Yang Yang

Subjects
Ecology, Chemistry, Environmental chemistry, Phosphorus, Hydrolase, Kinetics, chemistry.chemical_element, Soil carbon, Nitrogen cycle, Nitrogen, Ecology, Evolution, Behavior and Systematics
Published
2018

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