Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
Center for Environmental Remediation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China; College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China.
Sci Total Environ. 2019 Apr 1;659:664-672. doi: 10.1016/j.scitotenv.2018.12.404. Epub 2018 Dec 27.
Volatile organic compounds (VOCs) are the major components of the odor emitted from sewage sludge composting plants and are generally associated with odorous nuisances and health risks. However, few studies have considered the potential ozone generation caused by VOCs emitted from sewage sludge composting plants. This study investigated the VOC emissions from a full-scale composting plant. Five major treatment units of the composting plant were chosen as the monitoring locations, including the dewatered room, dewatered sludge, blender room, fermentation workshop, and product units. The fermentation workshop units displayed the highest concentration of VOC emissions at 2595.7 ± 1367.3 μg.m, followed by the blender room, product, dewatered sludge, and dewatered room units, whose emissions ranged from 142.2 ± 86.8 μg.m to 2107.6 ± 1045.6 μg.m. The detected VOC families included oxygenated compounds, alkanes, alkenes, sulfide compounds, halogenated compounds, and aromatic compounds. Oxygenated compounds, particularly acetone, were the most abundant compounds in all samples. Principal component analysis revealed that the dewatered room and dewatered sludge units clustered closely, as indicated by their similar component emissions. The product units differed from the other sampling units, as their typical compounds were methanethiol, styrene, carbon disulfide, and hexane, all of which were the products of the latter stages of composting. Among the treatment units, the fermentation workshop units had the highest propylene equivalent (propy-equiv) concentration. Dimethyl disulfide and limonene were the major contributors. Limonene had the highest propy-equiv concentration, which contributed to the increased atmospheric reactivity and ozone formation potential in the surrounding air. To control the secondary environmental pollution caused by the VOC emissions during sewage sludge composting, the emission of limonene and dimethyl disulfide must be controlled from the blender room and fermentation workshop units.
挥发性有机化合物（VOCs）是污水处理厂堆肥厂排放气味的主要成分，通常与恶臭扰民和健康风险有关。然而，很少有研究考虑过污水处理厂堆肥厂排放的 VOC 可能产生的臭氧。本研究调查了一个全规模堆肥厂的 VOC 排放情况。选择了堆肥厂的五个主要处理单元作为监测地点，包括脱水室、脱水污泥、搅拌机室、发酵车间和产品单元。发酵车间单元的 VOC 排放浓度最高，为 2595.7±1367.3μg·m-3，其次是搅拌机室、产品、脱水污泥和脱水室单元，排放范围为 142.2±86.8μg·m-3至 2107.6±1045.6μg·m-3。检测到的 VOC 家族包括含氧化合物、烷烃、烯烃、硫化物化合物、卤代化合物和芳香族化合物。含氧化合物，特别是丙酮，是所有样品中最丰富的化合物。主成分分析表明，脱水室和脱水污泥单元聚类紧密，表明它们的成分排放相似。产品单元与其他采样单元不同，因为它们的典型化合物是甲硫醇、苯乙烯、二硫化碳和己烷，这些都是堆肥后期的产物。在处理单元中，发酵车间单元的丙烯当量（propy-equiv）浓度最高。二甲基二硫醚和柠檬烯是主要贡献者。柠檬烯具有最高的 propy-equiv 浓度，这导致周围空气中大气反应性和臭氧形成潜力增加。为了控制污水处理厂堆肥过程中 VOC 排放引起的二次环境污染，必须从搅拌机室和发酵车间单元控制柠檬烯和二甲基二硫醚的排放。
