不同粒径沸石好氧堆肥中重金属的关键钝化机制。
Critical passivation mechanisms on heavy metals during aerobic composting with different grain-size zeolite.
机构信息
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory of Wetland Ecology and Environment, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China; Jilin Provincial Engineering Center of CWs Design in Cold Region & Beautiful Country Construction, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130102, China.
出版信息
J Hazard Mater. 2021 Mar 15;406:124313. doi: 10.1016/j.jhazmat.2020.124313. Epub 2020 Oct 19.
Available information about the passivation effect on heavy metals (HMs) through adsorption and humification during zeolite-amended composting remains limited. Thus, this study explored the dynamic changes in HM-fractions (Zn, Cu, Cd, Cr and Pb) during aerobic composting added with different grain-size zeolite (Fine zeolite, < 0.1 mm, ZF; Coarse zeolite: 3-5 mm, ZC). Compared to the control (without zeolite, CK) and ZF treatments, ZC treatment got the highest temperature in the thermophilic phase, and significantly reduced the bioavailability factor (BF) of HMs, especially for Cu (45.13%), Cd (16.11%) and Pb (25.49%). Redundancy analysis (RDA) and structural equation models (SEMs) indicated that zeolite accelerated the passivation effect on Cd and Pb through regulating the electrical conductivity (EC) as a result of surface adsorption, and on Cu by influencing total carbon (TC) under the function of humification. These results increase our understanding of the passivation mechanisms of HMs during aerobic composting.
沸石添加到好氧堆肥中对重金属（HM）的钝化作用通过吸附和腐殖化的相关信息仍然有限。因此，本研究探索了在添加不同粒径沸石（细沸石，<0.1mm，ZF；粗沸石：3-5mm，ZC）的好氧堆肥过程中，HM 各形态（Zn、Cu、Cd、Cr 和 Pb）的动态变化。与对照（无沸石，CK）和 ZF 处理相比，ZC 处理在高温阶段获得了最高的温度，并显著降低了重金属的生物有效因子（BF），特别是 Cu（45.13%）、Cd（16.11%）和 Pb（25.49%）。冗余分析（RDA）和结构方程模型（SEM）表明，沸石通过表面吸附调节电导率（EC）加速了 Cd 和 Pb 的钝化作用，通过腐殖化作用影响总碳（TC）来影响 Cu 的钝化作用。这些结果增加了我们对好氧堆肥过程中重金属钝化机制的理解。
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