Biochar aging alters the bioavailability of cadmium and microbial activity in acid contaminated soils

IF 12.2 1区环境科学与生态学 Q1 ENGINEERING, ENVIRONMENTAL Journal of Hazardous Materials Pub Date : 2021-10-15 DOI:10.1016/j.jhazmat.2021.126666

Tharanga Bandara , Ashley Franks , Jianming Xu , J.B.A.J. Chathurika , Caixian Tang

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引用次数: 16

Abstract

The effects of biochar aging on heavy-metal bioavailability and microbial activity are not fully understood. This study determined the effect over 270 days of poultry-litter biochar (PBC) and sugar-gum-wood biochar (SBC) on the bioavailability of Cd and microbial activity in acidic soils differing in organic matter content. Soil basal and substrate-induced respirations, microbial properties, Cd bioavailability and plant Cd bioaccumulation were evaluated at 1, 30, 90 and 270 days. The addition of PBC decreased Cd bioaccumulation by 81% and 85% while SBC decreased bioaccumulation by 47% and 56% in high (Chromosol) and low (Sodosol) organic matter soils, respectively, at Day 1. By Day 270, Cd bioaccumulation significantly (P < 0.05) increased in SBC-amended soils but decreased in PBC-amended soils. The addition of PBC increased both basal and substrate-induced microbial respirations compared to the other treatments over 270-day aging. However, SBC increased microbial biomass C compared to the PBC after Day 30. Aging decreased microbial respiration and biomass C in biochar-amended soils. It is concluded that Cd bioaccumulation increased in SBC-amended soils during aging whereas the PBC decreased Cd bioaccumulation and that the selection of biochar is important to enhance remediation efficiency in the long term.

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生物炭老化改变了酸污染土壤中镉的生物利用度和微生物活性

生物炭老化对重金属生物利用度和微生物活性的影响尚不完全清楚。本研究测定了270 d内不同有机质含量的酸性土壤中，禽肉残渣生物炭(PBC)和糖胶木生物炭(SBC)对Cd生物有效性和微生物活性的影响。分别在1、30、90和270 d对土壤基底和基质诱导呼吸、微生物特性、Cd生物利用度和植物Cd生物积累进行了评价。在第1天，添加PBC使高有机质(Chromosol)和低有机质(Sodosol)土壤的Cd生物积累分别减少了81%和85%，而SBC使高有机质(Chromosol)和低有机质(Sodosol)土壤的Cd生物积累分别减少了47%和56%。到第270天，Cd的生物积累显著(P <0.05)， sbc修正后的土壤中土壤水分含量增加，而pbc修正后的土壤中土壤水分含量减少。在270天的衰老过程中，与其他处理相比，添加PBC增加了基础和底物诱导的微生物呼吸。然而，与PBC相比，SBC在第30天增加了微生物生物量C。老化降低了生物炭改性土壤的微生物呼吸和生物量C。结果表明，在老化过程中，sbc对土壤Cd的累积量增加，而PBC对土壤Cd的累积量减少，生物炭的选择对提高土壤Cd的长期修复效率至关重要。

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来源期刊

Journal of Hazardous Materials 工程技术-工程：环境

CiteScore

25.40

自引率

5.90%

发文量

3059

审稿时长

58 days

期刊介绍： The Journal of Hazardous Materials serves as a global platform for promoting cutting-edge research in the field of Environmental Science and Engineering. Our publication features a wide range of articles, including full-length research papers, review articles, and perspectives, with the aim of enhancing our understanding of the dangers and risks associated with various materials concerning public health and the environment. It is important to note that the term "environmental contaminants" refers specifically to substances that pose hazardous effects through contamination, while excluding those that do not have such impacts on the environment or human health. Moreover, we emphasize the distinction between wastes and hazardous materials in order to provide further clarity on the scope of the journal. We have a keen interest in exploring specific compounds and microbial agents that have adverse effects on the environment.