ORGANIC WASTE DIGESTATE: A REVIEW OF ITS CHARACTERISTICS AND RESOURCES RECOVERY
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摘要: 有机固废厌氧消化是固体废物领域实现"双碳目标"的重要途径,但沼渣处理的"梗阻"问题制约了其应用与发展。通过文献调研大中型厌氧消化工程案例的实际数据,分析了4类典型有机固废沼渣,厨余垃圾、市政污泥、农业固废、城市固废有机组分的基本性质、营养物含量与重金属含量。基于沼渣特性、结合政策与规范标准阐述了国内外沼渣处理模式异同,并探讨了我国沼渣发展的瓶颈与发展方向。最后,从运输距离、规模效益、经济成本、市场渠道、碳排放等方面重点探讨了沼渣传统资源化处置路径与新兴资源化技术的机遇与挑战,旨在为政策制定、技术发展和产业应用提供参考。Abstract: Treatment of organic waste with anaerobic digestion (AD) is one of the most important steps in achieving carbon neutrality, but the treatment of biogas digestate limits the application and development of AD. In this paper, four typical types of organic waste digestate (i.e., food waste, sewage sludge, agricultural waste, and organic fraction of municipal solid waste) were studied. Their characteristics, nutrient and heavy metals concentrations were investigated, with the data derived from literature and internal unpublished databases of large and medium-sized AD plants. Furthermore, the bottleneck and future development of digestate treatment were discussed, by comparing the differences in policies, regulations, and standards from China and overseas. The opportunities and challenges of traditional digestate disposal means and the emerging resource-based technologies were evaluated, with a focus on transportation distance, scale-up capability, operation cost, and carbon emission, aiming to provide new information for policy formulation, technological development, and industrial applications.
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Key words:
- organic waste /
- anaerobic digestion /
- digestate /
- carbon emission /
- techno-economic assessment
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