School of Environment, Harbin Institute of Technology, Harbin 150090, China.
School of Environment, Harbin Institute of Technology, Harbin 150090, China; College of Resources and Environment, University of Chinese Academy of Sciences (UCAS), Beijing 100049, China.
Ecotoxicol Environ Saf. 2021 Jan 15;208:111756. doi: 10.1016/j.ecoenv.2020.111756. Epub 2020 Dec 8.
To deeply assess the feasibility of sewage sludge-based biochars for use in soil applications, this review compared sewage sludge-based biochars (SSBBs) with lignocellulose-based biochars (LCBBs) in terms of their pyrolysis processes, various fractions and potential soil applications. Based on the reviewed literature, significant differences between the components of SSBB and LCBB result in different pyrolysis behavior. In terms of the fractions of biochars, obvious differences were confirmed to exist in the carbon content, surface functional groups, types of ash fractions and contents of potential toxic elements (PTEs). However, a clear influence of the feedstock on labile carbon and polycyclic aromatic hydrocarbons (PAHs) was not observed in the current research. These differences determined subsequent discrepancies in the soil application potential and corresponding mechanisms. The major challenges facing biochar application in soils and corresponding recommendations for future research were also addressed. LCBBs promote carbon sequestration, heavy metal retention and organic matter immobilization. The application of SSBBs is a promising approach to improve soil phosphorus fertility, immobilize heavy metals and provide available carbon sources for soil microbes to stimulate microbial biomass. The present review provides guidance information for selecting appropriate types of biochars to address targeted soil issues.
为了深入评估基于污水污泥的生物炭在土壤应用中的可行性，本综述比较了基于污水污泥的生物炭（SSBB）和基于木质纤维素的生物炭（LCBB）在热解过程、各种组分和潜在土壤应用方面的差异。基于文献综述，SSBB 和 LCBB 成分之间存在显著差异，导致其热解行为不同。在生物炭的组分方面，碳含量、表面官能团、灰分类型和潜在有毒元素（PTE）含量存在明显差异。然而，目前的研究并未观察到原料对活性碳和多环芳烃（PAHs）的明显影响。这些差异决定了随后在土壤应用潜力和相应机制方面的差异。还讨论了生物炭在土壤中应用面临的主要挑战以及未来研究的建议。LCBB 促进碳固存、重金属保持和有机质固定。SSBB 的应用是提高土壤磷肥力、固定重金属并为土壤微生物提供可用碳源以刺激微生物生物量的有前途的方法。本综述为选择合适类型的生物炭来解决特定的土壤问题提供了指导信息。
