Passivation Effect of Corn Vinasse Biochar on Heavy Metal Lead in Paddy Soil of Pb-Zn Mining Area

Q4 Environmental Science

Nature Environment and Pollution Technology Pub Date : 2024-03-01 DOI:10.46488/nept.2024.v23i01.036

M. Xiong, G. Q. Dai, R. G. Sun, Z. Zhao

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引用次数: 0

Abstract

The in-lab incubation experiments were conducted to identify the passivation effect of corn vinasse biochar, which was prepared at different temperatures, on heavy metal Pb in paddy soil of the Pb-Zn mining area. The results showed that after 30 days of biochar amended to the soil, the soil pH and organic carbon content increased by 2.72%-8.47% and 27.79%-65.26%, respectively. The CO32- and OH- contained in corn vinasse biochar could react with Pb and generate carbonate and hydroxide of Pb. In comparison with the treatment control, the bioavailable fractions of Pb were reduced by 26.6%, 23.30%, 26.95%, and 35.33%, respectively, in biochar-amended treatments. Exchangeable fractions of Pb decreased by 21.50%, 21.33%, 22.58%, and 22.58% for the treatment 3% (300°C), 6% (300°C), 3% (600°C), and 6% (300°C) corn vinasse biochar, respectively, compared with the treatment control. As a whole, corn vinasse biochar could effectively promote the transformation of Pb in soil from the exchangeable fractions into the Fe-Mn oxide-bound fractions and residue fractions, with a significant passivation effect for Pb in soil and more effective passivation by high-temperature preparation and increased dosage of biochar.

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玉米沼渣生物炭对铅锌矿区水稻土中重金属铅的钝化效果

为了确定不同温度下制备的玉米沼渣生物炭对铅锌矿区水稻土中重金属铅的钝化效果，进行了实验室培养实验。结果表明，在土壤中添加生物炭 30 天后，土壤 pH 值和有机碳含量分别提高了 2.72%-8.47%和 27.79%-65.26%。玉米沼渣生物炭中的 CO32- 和 OH- 能与铅发生反应，生成铅的碳酸盐和氢氧化物。与处理对照相比，经生物炭改良的处理中，铅的生物可利用部分分别减少了 26.6%、23.30%、26.95% 和 35.33%。与处理对照相比，3%（300°C）、6%（300°C）、3%（600°C）和 6%（300°C）玉米沼渣生物炭处理的可交换部分的铅分别减少了 21.50%、21.33%、22.58% 和 22.58%。总体而言，玉米沼渣生物炭能有效促进土壤中的铅从可交换组分转化为铁锰氧化物结合组分和残渣组分，对土壤中的铅有显著的钝化作用，高温制备和增加生物炭的用量能更有效地钝化土壤中的铅。

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来源期刊

Nature Environment and Pollution Technology Environmental Science-Environmental Science (all)

CiteScore

1.20

自引率

0.00%

发文量

159

审稿时长

36 weeks

期刊介绍： The journal was established initially by the name of Journal of Environment and Pollution in 1994, whose name was later changed to Nature Environment and Pollution Technology in the year 2002. It has now become an open access online journal from the year 2017 with ISSN: 2395-3454 (Online). The journal was established especially to promote the cause for environment and to cater the need for rapid dissemination of the vast scientific and technological data generated in this field. It is a part of many reputed international indexing and abstracting agencies. The Journal has evoked a highly encouraging response among the researchers, scientists and technocrats. It has a reputed International Editorial Board and publishes peer reviewed papers. The Journal has also been approved by UGC (India). The journal publishes both original research and review papers. The ideology and scope of the Journal includes the following. -Monitoring, control and management of air, water, soil and noise pollution -Solid waste management -Industrial hygiene and occupational health -Biomedical aspects of pollution -Toxicological studies -Radioactive pollution and radiation effects -Wastewater treatment and recycling etc. -Environmental modelling -Biodiversity and conservation -Dynamics and behaviour of chemicals in environment -Natural resources, wildlife, forests and wetlands etc. -Environmental laws and legal aspects -Environmental economics -Any other topic related to environment