Chen Wan-Ting, Haque Md Akiful, Lu Taofeng, Aierzhati Aersi, Reimonn Gregory
Department of Plastic Engineering, University of Massachusetts Lowell, Lowell, MA, USA, 01854.
Department of Agricultural & Biological Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA, 61801.
Curr Opin Environ Sci Health. 2020 Apr;14:63-73. doi: 10.1016/j.coesh.2020.02.008. Epub 2020 Mar 10.
The US annually produces 79 million dry tons of liquid organic waste including sewage sludge. Anaerobic digestion can only reduce the sludge volume by 50% in mass, leaving the other half as a growing waste management and hygienic problem. Hydrothermal processing (HTP), a set of several chemical digestion processes, could be used to convert sewage sludge into valuable products and minimize potential environmental pollution risks. Specifically, hydrothermal carbonization and hydrothermal liquefaction have been extensively studied to sustainably manage sludge. Two of the main reasons for this are the high upscalability of HTP for public waste management and that it is estimated that HTP can recover eleven times more energy from waste products than landfilling. An integration of HTP with anaerobic digestion or recycling the soluble organics (in the HTP aqueous products) into the HTP process could lead to a higher overall rate of energy recovery for municipal sewage sludge.
美国每年产生7900万干吨包括污水污泥在内的液态有机废物。厌氧消化只能使污泥体积在质量上减少50%，另一半则成为日益严重的废物管理和卫生问题。水热加工（HTP）是一组化学消化过程，可用于将污水污泥转化为有价值的产品，并将潜在的环境污染风险降至最低。具体而言，水热碳化和水热液化已被广泛研究以可持续地管理污泥。这样做的两个主要原因是HTP在公共废物管理方面具有很高的扩大规模的能力，并且据估计，HTP从废品中回收的能量比填埋多11倍。将HTP与厌氧消化相结合，或将可溶性有机物（在HTP水性产物中）再循环到HTP过程中，可能会提高城市污水污泥的总体能量回收率。
