Removal of PAHs in the aerobic composting of municipal sludge
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.
万方数据
维普
