Beijing Key Laboratory for Source Control Technology of Water Pollution, Engineering Research Center for Water Pollution Source Control and Eco-remediation, College of Environmental Science and Engineering, Beijing Forestry University, Beijing 100083, China.
Beijing Key Laboratory of Airborne Particulate Matter Monitoring Technology, Beijing Municipal Environment Monitoring Center, Beijing 100048, China.
Waste Manag. 2018 Jul;77:593-602. doi: 10.1016/j.wasman.2018.05.049. Epub 2018 Jun 19.
The emission of volatile sulfur compounds (VSCs) causing strong odors is a major problem in municipal sewage sludge composting plants (MSSACPs). Improving the knowledge on characteristics of VSCs emission in MSAACPs is of particular significance to elimate odors, but the studies conducted on-site to identify them are scarce. To this purpose, characteristics of VSCs emission were studied on-site from a MSSACP during different ambient temperatures corresponding with seasonal variations. Results reveal that (1) the total emission of VSCs which included methyl disulfide (DMDS), methyl sulfide (DMS), carbon disulfide, methyl mercaptan, and hydrogen sulfide (HS) was 561.89 mg/dry kg in summer, 358.45 mg/dry kg in spring, and 215.52 mg/dry kg in winter, and the greatest amounts of VSCs were emitted during the mesophilic and pre-thermophilic phases; (2) although DMDS and DMS contributed the most towards total VSCs emissions during winter (81.93%), spring (82.55%), and summer (83.90%), their odor contributions were less than that of HS; (3) in summer, the odor nuisance of total VSCs was higher than that in winter and spring; (4) sulfur loss in the form of VSCs emissions and total sulfur loss both increased with rising ambient temperatures during the sewage sludge aerobic composting. Results obtained in this study will be beneficial towards the elimation of odors released from MSSACPs.
挥发性含硫化合物（VSCs）的排放会产生强烈的气味，是城市污水污泥堆肥厂（MSSACPs）中的一个主要问题。提高对 MSSACPs 中 VSCs 排放特征的认识对于消除异味尤为重要，但目前对现场进行的研究很少。为此，本研究在不同环境温度下（对应季节性变化）对 MSSACP 进行了现场研究，以研究 VSCs 的排放特征。结果表明：（1）夏季总 VSCs 排放量（包括二甲基二硫（DMDS）、甲硫醚（DMS）、二硫化碳、甲硫醇和硫化氢（HS））为 561.89 mg/dry kg，春季为 358.45 mg/dry kg，冬季为 215.52 mg/dry kg，最大排放量出现在中温和预升温阶段；（2）尽管冬季（81.93%）、春季（82.55%）和夏季（83.90%）DMDS 和 DMS 对总 VSCs 排放的贡献最大，但它们的气味贡献小于 HS；（3）夏季总 VSCs 的异味问题比冬季和春季严重；（4）在污水污泥好氧堆肥过程中，随着环境温度的升高，以 VSCs 形式排放的硫损失和总硫损失均增加。本研究的结果将有助于消除 MSSACPs 释放的异味。
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