School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China; Tianjin Municipal Engineering Design & Research Institute Co., Ltd., Tianjin 300380, China.
J Environ Sci (China). 2023 Jun;128:224-249. doi: 10.1016/j.jes.2022.07.038. Epub 2022 Aug 16.
This study aims to comprehensively analyze the Greenhouse Gases (GHGs) emissions from current sewage sludge treatment and disposal technologies (building material, landfill, land spreading, anaerobic digestion, and thermochemical processes) based on the database of Science Citation Index (SCI) and Social Science Citation Index (SSCI) from 1998 to 2020. The general patterns, spatial distribution, and hotspots were provided by bibliometric analysis. A comparative quantitative analysis based on life cycle assessment (LCA) put forward the current emission situation and the key influencing factors of different technologies. The effective GHG emissions reduction methods were proposed to mitigate climate change. Results showed that incineration or building materials manufacturing of highly dewatered sludge, and land spreading after anaerobic digestion have the best GHG emissions reduction benefits. Biological treatment technologies and thermochemical processes have great potential for reducing GHGs. Enhancement of pretreatment effect, co-digestion, and new technologies (e.g., injection of carbon dioxide, directional acidification) are major approaches to facilitate substitution emissions in sludge anaerobic digestion. The relationship between the quality and efficiency of secondary energy in thermochemical process and GHGs emission still needs further study. Solid sludge products generated by bio-stabilization or thermochemical processes are considered to have a certain carbon sequestration value and can improve the soil environment to control GHG emissions. The findings are useful for future development and processes selection of sludge treatment and disposal facing carbon footprint reduction.
本研究旨在基于 1998 年至 2020 年科学引文索引（SCI）和社会科学引文索引（SSCI）数据库，全面分析当前污水污泥处理处置技术（建材、填埋、土地利用、厌氧消化和热化学工艺）的温室气体（GHG）排放。通过文献计量分析提供了一般格局、空间分布和热点。基于生命周期评估（LCA）的比较定量分析提出了不同技术的当前排放情况和关键影响因素。提出了有效的 GHG 减排方法，以减轻气候变化。结果表明，高度脱水污泥的焚烧或制造建材，以及厌氧消化后的土地利用具有最佳的 GHG 减排效益。生物处理技术和热化学工艺具有很大的减排潜力。增强预处理效果、共消化和新技术（例如，二氧化碳注入、定向酸化）是促进污泥厌氧消化替代排放的主要方法。热化学工艺中二次能源的质量和效率与 GHGs 排放之间的关系仍需要进一步研究。生物稳定化或热化学工艺产生的固体污泥产物被认为具有一定的碳封存价值，可以改善土壤环境以控制 GHG 排放。这些发现有助于未来减少碳足迹的污泥处理处置的发展和工艺选择。
