Emission, dispersion, and potential risk of volatile organic and odorous compounds in exhaust from two sludge thermal drying processes
Emission, dispersion, and potential risk of volatile organic and odorous compounds in exhaust from two sludge thermal drying processes
复制标题
两个污泥热干燥工艺废气中挥发性有机物和恶臭化合物的排放、扩散和潜在风险
DOI：
10.1016/j.wasman.2021.11.040
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发表时间：
2022
期刊：
影响因子：
8.1
通讯作者：
Junxin Liu
中科院分区：
文献类型：
--
作者：
Song Xue;Wenjie Ding;Lin Li;Jiawei Ma;Fengguang Chai;Junxin Liu
研究了两种污泥干燥方法之间的有臭味和挥发性有机化合物 (VOC) 的排放情况。通过间接干燥法对污泥干燥废气中总共鉴定并定量了 37 种化合物。检测到的VOCs总量范围为3.45×10-3至4.53mg/m3，其中包括苯系物、挥发性有机硫和含氮有机化合物。采用直接干燥法的干燥车间废气排放量较高。二氧化硫、芳烃和氯化化合物占主导地位。根据嗅觉效果分析和致癌风险评估，主要致臭气态污染物为甲硫醇、甲硫醚（间接污泥干化工艺）和SO2（直接污泥干化工艺），主要致癌物为苯、四氯化碳、氯仿、亚甲基。这项研究为热污泥干燥过程废气中挥发性有机化合物和有味化合物的排放特征、嗅觉影响和癌症风险提供了新的见解。
Emissions of odorous and volatile organic compounds (VOCs) were investigated between two sludge drying methods. A total of 37 chemical compounds were identified and quantified from the off-gases from sludge drying by indirect drying method. The total number of VOCs detected ranged from 3.45 × 10-3to 4.53 mg/m3, which includes benzene series, volatile organic sulfur, and nitrogenous organic compounds. High emissions were found in the exhaust gas released from drying workshop that used direct drying method. Sulfur dioxide, aromatics, and chlorinated compounds were dominant. Based on the olfactory effect analysis and cancer risk assessment, the main odor-causing gaseous pollutants were methyl mercaptan and methyl sulfide (for indirect sludge drying process) and SO2(for direct sludge drying process), while the dominant carcinogens were benzene, carbon tetrachloride, chloroform, and methylene. This study provides new insights into the emission characteristics, olfactory effects, and cancer risks of VOCs and odorous compounds in the exhaust gas from thermal sludge drying processes.