Shanghai Urban Construction Design & Research Institute Groups Co., Ltd., Shanghai 200125, China.
China Civil Engineering Society Water Industry Association, Beijing 100082, China.
Waste Manag. 2020 Mar 15;105:355-363. doi: 10.1016/j.wasman.2020.02.027. Epub 2020 Feb 28.
The treatment, disposal and resource recovery of sewage sludge is a major bottleneck for the water and environmental remediation efforts in China. In this paper, sixteen sludge treatment plants using anaerobic digestion and aerobic composting as stabilization procedures were investigated and analysed. The organic degradation rates varied from 0.5% to 80.2% of different plants, showing the close relationship with raw sludge property and treatment process. The increment rate of humic-like substances ranged from 19% to 81% in different cases. It has been aware of that stabilization procedures coupled the degradation of simple organics (proteins, polysaccharides, lipids) with the synthesis of complex organics (humic-like substances). Therefore, an alternative methodology, considering the content of humic-like substances (no less than 150 mg/gVS) and the fluorescence complexity index (up to 5.0) in the end-products, was proposed to evaluate the stabilization level. Humic-like substances indicate the ecological value of the end-products. Fluorescence complexity index, combining the reduction of protein-like substances with the increment of humic-like substances, can predict the humification degree. The new criterion can be the supplementary of the current ones.
污水污泥的处理、处置和资源回收是中国水和环境修复努力的主要瓶颈。本文对采用厌氧消化和有氧堆肥作为稳定化程序的 16 个污泥处理厂进行了调查和分析。不同工厂的有机降解率从 0.5%到 80.2%不等，这与原始污泥性质和处理工艺密切相关。不同情况下类腐殖质物质的增量率在 19%到 81%之间。人们已经意识到，稳定化程序将简单有机物（蛋白质、多糖、脂质）的降解与复杂有机物（类腐殖质物质）的合成结合在一起。因此，提出了一种替代方法，考虑最终产物中类腐殖质物质（不少于 150mg/gVS）和荧光复杂度指数（高达 5.0）的含量，以评估稳定化水平。类腐殖质物质表明了最终产物的生态价值。荧光复杂度指数结合了蛋白质类物质的减少和类腐殖质物质的增加，可以预测腐殖化程度。新标准可以作为现行标准的补充。
