Effects of different additives and aerobic composting factors on heavy metal bioavailability reduction and compost parameters: A meta-analysis.
Effects of different additives and aerobic composting factors on heavy metal bioavailability reduction and compost parameters: A meta-analysis.
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DOI：
10.1016/j.envpol.2022.119549
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发表时间：
2022-05
影响因子：
8.9
通讯作者：
Yousif Abdelrahman Yousif Abdellah-Yousif-Abdelrahman-Yousif-Abdellah-2166579122;Zhao-peng Shi;Yuhu Luo;Wenhao Hou;Xi Yang;Rui-Long Wang
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文献类型：
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作者：
Yousif Abdelrahman Yousif Abdellah-Yousif-Abdelrahman-Yousif-Abdellah-2166579122;Zhao-peng Shi;Yuhu Luo;Wenhao Hou;Xi Yang;Rui-Long Wang
添加剂被认为是加速堆肥过程和减轻污染物向环境传播的一种有前途的方法。然而，几乎所有先前的文章都集中在添加剂用量对堆肥过程中有机质减少的影响上，这可能不能完全代表影响堆肥过程中有机质生物利用度状态的主要因素。同时，以往的研究只探讨了堆肥过程中有机肥的影响、形成和毒性机制。因此，通过测量响应比[ln (RR)]和尺寸效应（%）的加权平均值，开展了一项全球尺度的荟萃分析，探讨了土壤有机质生物利用度和堆肥参数对不同添加剂、堆肥时间和堆肥因素（添加剂类型、原料、膨化剂和堆肥方式）的响应模式。结果表明，与对照组相比，添加物显著降低了最终堆肥产品中HMs的生物利用度≥40%。Zn、Pb、Ni、Cu、Cr和Cd的生物利用度递减率分别为- 40%、- 60%、- 57%、- 55%、- 42%和- 44%。添加剂显著提高了总氮（TN）（+16%）、pH（+5%）和温度（+5%），降低了总有机碳（TOC）（- 17%）、水分含量（MC）（- 18%）和C/N比（- 19%）。此外，堆肥时间的延长显著促进了添加剂对HMs生物利用度下降的影响（p< 0.05）。然而，添加量的增加对HMs生物利用度的降低影响不显著（p < 0.05）。以沸石为添加剂、鸡粪为原料、木屑为膨化剂、反应器为堆肥方式对HMs生物利用度的降低效果最为显著（p< 0.05）。本荟萃分析的结果可能有助于添加剂和堆肥因子的选择、修改和应用，以管理堆肥产品中生物可利用性HMs的水平。
Additives are considered a promising approach to accelerate the composting process and alleviate the dissemination of pollutants to the environment. However, nearly all previous articles have focused on the impact of additive amounts on the reduction of HMs, which may not fully represent the main factor shaping HMs bioavailability status during composting. Simultaneously, previous reviews only explored the impacts, speciation, and toxicity mechanism of HMs during composting. Hence, a global-scale meta-analysis was conducted to investigate the response patterns of HMs bioavailability and compost parameters to different additives, composting duration, and composting factors (additive types, feedstock, bulking agents, and composting methods) by measuring the weighted mean values of the response ratio "[ln (RR)]" and size effect (%). The results revealed that additives significantly lessened HMs bioavailability by ≥ 40% in the final compost products than controls. The bioavailability decline rates were −40%, −60%, −57%, −55%, −42%, and −44% for Zn, Pb, Ni, Cu, Cr, and Cd. Simultaneously, additives significantly improved the total nitrogen (TN) (+16%), pH (+5%), and temperature (+5%), and decreased total organic carbon (TOC) (−17%), moisture content (MC) (−18%), and C/N ratio (−19%). Furthermore, we found that the prolongation of composting time significantly promoted the effect of additives on declining HMs bioavailability (p< 0.05). Nevertheless, increasing additive amounts revealed an insignificant impact on decreasing the HMs bioavailability (p> 0.05). Eventually, using zeolite as an additive, chicken manure as feedstock, sawdust as a bulking agent, and a reactor as composting method had the most significant reduction effect on HMs bioavailability (p< 0.05). The findings of this meta-analysis may contribute to the selection, modification, and application of additives and composting factors to manage the level of bioavailable HMs in the compost products.