Usability of rice straw biochar for remediation and amelioration of vanadium contaminated soils in areas under acid rain leaching

IF 2 4区环境科学与生态学 Q3 CHEMISTRY, ANALYTICAL

Environmental Chemistry Pub Date : 2022-07-28 DOI:10.1071/en21153

Ya-qi Yu, Jin-xin Li, Jin-yan Yang

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引用次数: 1

Abstract

Environmental context Biochar produced by agricultural wastes can be used for vanadium treatment, soil fertility improvement, and agricultural waste disposal, whereas acid rain leaching may decrease its remediating efficiency of the metal contaminated soil. Therefore, vanadium behaviour in soil and soil quality change after biochar application were analysed under simulated acid rain leaching. Findings provide insights into acid rain leaching effects on soil quality, vanadium release from soil, and biochar remediating efficiency. Rationale Considering the effects of acid rain on the leaching of metals and nutrients in soil, rice straw biochar, with the potential to remediate and improve the quality of vanadium contaminated soil, was further evaluated for its remediating and ameliorating performance of soil under acid rain. Methodology The adsorption capacity and isotherm of vanadium by rice straw biochar were investigated. Simulated acid rain leaching experiments were performed to study the influence of acid rain on vanadium behaviour in soil and nutrients and on the structure of the soil. Results Isotherm adsorption studies indicated a preference for a monolayer process without transmigrations of the adsorbed vanadium onto the biochar surface. After leaching with simulated acid rain, compared with the untreated soil, the available vanadium (129.63 ± 3.75–76.10 ± 3.24 mg kg−1) in the soil decreased notably by adding 2–3 wt% biochar (P < 0.05). The organic matter content (1.71 ± 0.25–4.31 ± 0.42%) and available P content (15.13 ± 0.56–29.88 ± 0.28 mg kg−1) in the soil increased with the biochar application ratio increasing from 0 to 3 wt%. Whereas the available N concentration in the soil amended with 3 wt% biochar (27.70 ± 4.35 mg kg−1) was significantly lower than that without biochar addition (41.28 ± 1.62 mg kg−1) (P < 0.05). In addition, an increased proportion of macro-aggregates and decreased proportion of micro-aggregates of the soil after application of 2–3 wt% biochar was also observed. Discussion The application of rice straw biochar at the addition level of 3 wt% has potential for remediating and ameliorating vanadium contaminated soil under acid rain. Appropriate modification of the biochar should be undertaken in future to achieve an effective remediation and amelioration of soil under a long-term influence of acid rain. It is also of interest to study the capacity of the biochar to amend soils with high N load.

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秸秆生物炭对酸雨淋洗地区钒污染土壤修复和改良的可用性

农业废弃物产生的生物炭可用于钒的处理、土壤肥力的提高和农业废弃物的处理，而酸雨淋溶可能会降低其对金属污染土壤的修复效率。因此，在模拟酸雨淋滤条件下，分析了施用生物炭后土壤中钒的行为和土壤质量的变化。研究结果揭示了酸雨淋滤对土壤质量、土壤钒释放和生物炭修复效率的影响。基于酸雨对土壤中金属和养分淋溶的影响，进一步评价了秸秆生物炭对酸雨下钒污染土壤的修复和改良效果，认为其具有修复和改善钒污染土壤质量的潜力。方法考察秸秆生物炭对钒的吸附量和等温线。通过模拟酸雨淋滤试验，研究了酸雨淋滤对土壤中钒的行为和养分以及土壤结构的影响。结果等温线吸附研究表明，单分子层吸附过程不会使吸附的钒迁移到生物炭表面。模拟酸雨淋滤后，添加2 ~ 3 wt%生物炭的土壤有效钒(129.63±3.75 ~ 76.10±3.24 mg kg−1)显著低于未处理土壤(P < 0.05)。土壤有机质含量(1.71±0.25 ~ 4.31±0.42%)和速效磷含量(15.13±0.56 ~ 29.88±0.28 mg kg−1)随生物炭施用量从0 wt%增加而增加。添加3 wt%生物炭的土壤有效氮含量(27.70±4.35 mg kg−1)显著低于未添加生物炭的土壤有效氮含量(41.28±1.62 mg kg−1)(P < 0.05)。此外，施用2 ~ 3 wt%的生物炭后，土壤的大团聚体比例增加，微团聚体比例降低。讨论秸秆生物炭添加量为3 wt%时，对酸雨条件下钒污染土壤具有修复和改良的潜力。今后应对生物炭进行适当的改性，以实现对酸雨长期影响下土壤的有效修复和改良。研究生物炭对高氮负荷土壤的修复能力也具有重要意义。

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来源期刊

Environmental Chemistry 环境科学-分析化学

CiteScore

4.50

自引率

0.00%

发文量

审稿时长

2.7 months

期刊介绍： Environmental Chemistry publishes manuscripts addressing the chemistry of the environment (air, water, earth, and biota), including the behaviour and impacts of contaminants and other anthropogenic disturbances. The scope encompasses atmospheric chemistry, geochemistry and biogeochemistry, climate change, marine and freshwater chemistry, polar chemistry, fire chemistry, soil and sediment chemistry, and chemical aspects of ecotoxicology. Papers that take an interdisciplinary approach, while advancing our understanding of the linkages between chemistry and physical or biological processes, are particularly encouraged. While focusing on the publication of important original research and timely reviews, the journal also publishes essays and opinion pieces on issues of importance to environmental scientists, such as policy and funding. Papers should be written in a style that is accessible to those outside the field, as the readership will include - in addition to chemists - biologists, toxicologists, soil scientists, and workers from government and industrial institutions. All manuscripts are rigorously peer-reviewed and professionally copy-edited. Environmental Chemistry is published with the endorsement of the Commonwealth Scientific and Industrial Research Organisation (CSIRO) and the Australian Academy of Science.