HAOXiao-di,LIJia-yong,HAOLi-ting,et al.Analysis and Assessment on the Feasibility of Sludge-based Biochar[J].China Water & Wastewater,2023,39(20):1-8.
剩余污泥制取生物炭可行性分析与评价
- Title:
- Analysis and Assessment on the Feasibility of Sludge-based Biochar
- Keywords:
- waste activated sludge; straw; biochar; heavy metals
- 摘要:
- 在碳中和背景下，剩余污泥资源与能源化利用成为今后研究与应用的方向。用污水处理后产生的剩余污泥制造生物炭受到广泛关注，但是对污泥生物炭的研究却值得商榷。在简述生物炭一般制备原理与过程的基础上，通过详细计算定量评估并分析了污泥生物炭制造过程能耗、成本、性能等方面的内容，并与秸秆生物炭进行了横向比较。结果显示，污泥生物炭制备需投入大量能量（-695 kW·h/tDS），难以抵消其产能，且生产成本高达927.49元/t生物炭。相比之下，秸秆生物炭制造为净能量输出过程，平衡投入能量后仍有1 400 kW·h/t秸秆的盈余能量；秸秆生物炭制备成本远低于污泥生物炭，仅为575.72元/t生物炭。在性能方面，污泥生物炭“固碳”含量仅为秸秆生物炭的20%，灰分含量却高达秸秆生物炭的两倍。显然，与秸秆生物炭相比，污泥生物炭无论是制备过程还是性能方面都不占优势。在秸秆生物炭尚未大规模推广应用的情况下，大规模投入对污泥生物炭的研究应慎行。
- Abstract:
- With the background of carbon neutrality, resource and energy utilizations of waste activated sludge (WAS) have become a future topic of research and application. Biochar produced by WAS seems currently attractive in the aspect of research & development (R & D). However, is it practical for sludge conversion to biochar-Based on a summarized description on the principles and processes of biochar production, this article is dealt with quantitative (calculation-based) evaluations on energy consumption, cost and performance of sludge-based biochar, which is then compared with those of straw-based biochar. The calculated results reveal that sludge-based biochar would consume a lot of net energy (-695 kW·h/tDS), which can not balance the energy input and thus result in a high producing cost, up to 927.49 yuan per ton of biochar. By comparison, the manufacturing process of straw-based biochar could produce an energy surplus of 1 400 kW·h/t straw, associated with a lower producing cost, down to 575.72 yuan per ton of biochar. Regarding the carbon-fixation performances, the fixed carbon content by sludge-based biochar is about 20% of straw-based biochar, while sludge-based biochar contains two-time higher ash content than that of straw-based biochar. Clearly, sludge-based biochar has no priority over straw-based biochar, in regard of both production and performance. Considering straw-based biochar has not been applied widely, input into R & D on sludge-based biochar is inappropriate.
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