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. 2020 Mar 10;707:135478. doi: 10.1016/j.scitotenv.2019.135478. Epub 2019 Nov 12.
The implementation of domestic waste classification following the principles of reduction, recycling, and harmlessness is an effective method to improve the urban and rural environments and to promote resource recycling. However, in many developing countries, the community residents lack awareness of the benefits of classified collection, which leads to a lack of initiative to classify MSW. To make the people realize the importance of MSW classification and increase the classification dynamics, Suzhou, China was taken as an example in this study, and residential areas were selected as sampling sites for classified and mixed collection of domestic waste. The main components of the odorous volatile organic compounds (VOCs) emitted from the dustbins via different disposal modes were determined by sampling in spring, summer, autumn, and winter. In addition, the ozone formation potential (OFP) and human health risk assessment of the VOCs were analyzed. Halogenated compounds were the major pollutants from the household waste dustbins of the residential areas. However, aromatic compounds contributed the most to the OFP of the VOCs. The OFP of VOCs reached the highest peak in summer, which was 1.02 × 10 μg/m. Furthermore, more attention needs to be paid in classifying waste to reduce the concentration of OFP. Although there was a carcinogenic risk in spring and summer, it declined after waste classification. Compared with mixed collection, the source-classified collection of garbage had advantages in terms of controlling the emission of VOCs, ozone formation potential, and human health risk. These results could provide the evidence demonstrating the advantages of waste classification and attract people's attention. Furthermore, the results can also provide impetus to those countries, where separate collection of waste has not yet been implemented, to improve the enthusiasm for classification and the integrity of waste classification system. Residents should be encouraged to classify household waste in residential areas.
实施生活垃圾减量化、资源化、无害化分类，是改善城乡环境、促进资源循环利用的有效途径。然而，在许多发展中国家，社区居民缺乏对分类收集效益的认识，导致缺乏对生活垃圾进行分类的积极性。为了让人们认识到垃圾分类的重要性，提高垃圾分类的积极性，本研究以中国苏州为例，选择居民区作为分类和混合收集生活垃圾的采样点。通过在春、夏、秋、冬四个季节对不同处理模式下垃圾桶散发的恶臭挥发性有机化合物（VOCs）的主要成分进行采样，分析了 VOCs 的臭氧形成潜力（OFP）和人体健康风险评估。结果表明，卤代化合物是居民区生活垃圾垃圾桶的主要污染物，但芳香族化合物对 VOCs 的 OFP 贡献最大。VOCs 的 OFP 在夏季达到最高峰值，为 1.02×10μg/m。此外，在分类垃圾时需要更加注意，以降低 OFP 的浓度。虽然在春季和夏季存在致癌风险，但垃圾分类后风险有所降低。与混合收集相比，垃圾源头分类收集在控制 VOCs 排放、臭氧形成潜力和人体健康风险方面具有优势。这些结果可以为垃圾分类的优势提供证据，吸引人们的关注。此外，这些结果还可以为尚未实施废物分类的国家提供动力，提高分类积极性和废物分类系统的完整性。应该鼓励居民在居民区对家庭垃圾进行分类。
