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| Removal of PAHs in the aerobic composting of municipal sludge |
| Received:March 18, 2023 |
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| KeyWord:polycyclic aromatic hydrocarbons;sludge;aerobic composting;source analysis |
| Author Name | Affiliation | E-mail | | ZHANG Huiyu | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | SONG Xueying | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China
Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, Putian University, Putian 351100, China | songxy2046@163.com | | YOU Mingchao | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | XUE Liyuan | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | LI Fengjiao | Key Laboratory of Regional Environment and Eco-Remediation, Ministry of Education, Shenyang University, Shenyang 110044, China | | | ZHAO Xiaoxu | Fujian Provincial Key Laboratory of Ecology-Toxicological Effects & Control for Emerging Contaminants, Putian University, Putian 351100, China | | | WANG Xing | Liaoning Huadian Changxing Biological Environmental Protection Co., Ltd., Shenyang 110000, China | |
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| Abstract: |
| This study conducted three batches of aerobic compost field experiments using Shenyang municipal sludge to investigate the removal dynamics of polycyclic aromatic hydrocarbons（PAHs） during aerobic composting. The analysis focused on the pollution characteristics, pollution sources, and removal dynamics of PAHs in municipal sludge. The results showed significant variations in the content of ∑PAHs in Shenyang municipal sludge across different seasons, ranging from 0.82 mg`kg-1 to 3.73 mg·kg-1. High-ring PAHs （n≥4）accounted for 94.0% of the sludge composition in summer, while low-ring PAHs（n<4）dominated in winter and spring with mass ratios of 76.0% and 63.0%, respectively. Source analysis of PAHs in Shenyang sludge using the double ratio method indicated that the main source of PAHs in the sludge was coal combustion. The degradation effect of PAHs after composting followed the order of ∑PAHs removal rate in spring at 52.8%, followed by summer at 49.1%, and winter at 46.7%. Aerobic composting resulted in significant degradation of PAHs, which contributes to the achievement of harmless resource recovery from sludge. |
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