Supplementary information files for "China’s enhanced wastewater treatment capacity may accelerate greenhouse gas emissions from rural domestic pollution"

Supplementary files for article " China’s enhanced wastewater treatment capacity may accelerate greenhouse gas emissions from rural domestic pollution"<br><br>The diminution of the benefits of domestic pollution control by greenhouse gas (GHG) emissions has received considerable attention. Emission factors related to the construction and operation of wastewater treatment systems have been well characterized in urban settings but far less so in rural areas. To address this gap, we developed an integrative modeling framework that quantifies the entire chain of rural domestic pollution processes together with the associated GHG emissions. Our analysis suggests that the control of China’s rural domestic pollution has realized a threefold increase over the past decade, resulting in a decline of carbon (C), nitrogen (N), and phosphorus (P) discharge to surface waters by 1158 Gg, 316 Gg, and 43 Gg, respectively. However, GHG emissions have also discernibly increased from 26.7 Tg to 31.4 Tg. Even though over 70% of China’s rural domestic pollution is still being discharged untreated, GHG emissions from wastewater treatment systems have become prevalent and currently account for more than 60% of total GHG emissions from rural areas. Considering the on-going construction of numerous new wastewater treatment systems in rural areas, enhancing wastewater treatment capacity, strengthening resource recovery, optimizing dietary patterns of the public, and promoting the use of clean energy are recommended to balance the trade-offs between environmental pollution abatement and climate change mitigation.<br><br>© The Author(s), CC BY-NC-ND 4.0

《中国提升污水处理能力或加剧农村生活污染带来的温室气体排放》论文补充材料

温室气体（GHG）排放削弱了生活污染治理的效益，该问题已受到广泛关注。与污水处理系统建设及运行相关的排放因子，在城市场景中已得到充分表征，但在农村地区的相关研究却相对匮乏。为填补这一研究空白，本研究构建了一套综合建模框架，可量化农村生活污染全过程及其伴随的温室气体排放。分析结果显示，近十年来我国农村生活污染治理力度提升至原来的三倍，使得排入地表水体的碳（C）、氮（N）、磷（P）分别减少1158 Gg、316 Gg和43 Gg。但与此同时，温室气体排放量也显著上升，从26.7 Tg增至31.4 Tg。尽管我国仍有超70%的农村生活污染未经处理直接排放，但污水处理系统产生的温室气体排放已愈发普遍，目前占农村地区温室气体排放总量的60%以上。鉴于当前农村地区仍在兴建大量新增污水处理系统，本研究建议通过提升污水处理能力、强化资源回收、优化公众饮食结构以及推广清洁能源使用，来平衡环境污染治理与气候变化减缓之间的权衡关系。

© 作者，CC BY-NC-ND 4.0