نوع مقاله : مروری
نویسنده
دانشگاه تبریز
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسنده [English]
Nowadays, contamination of water and soil resources with the metalloid arsenic (As) is believed to be a major problem for human health. This element is identified as a cause of cancer by World Health Organization (WHO) as well as a toxic substance for plants. Decontamination of soils containing As are varied including physical, chemical and biological methods each of which have their advantages and disadvantages. Biochar, as one of the solutions, involves thermochemical treatment of agricultural residues, urban solid waste, and livestock manure. The use of biochar is generally associated with four major goals, namely soil fertility enhancement, carbon sequestration in soil, restoring degraded lands, and soil and water contamination management. Data-based studies concerning As immobilization in soils are not well-reported in literature; however, examining biochar impact mechanisms on water and contaminated soils and the ways to apply the findings on industrial scales are newly emerging areas of interest. In the present study, metalloid arsenic chemistry in soil and water is briefly explained, and the research findings on biochar and arsenic interaction are reviewed. As a conclusion, the initial biomass type, and pyrolysis conditions are discussed as determining factors in such an interaction. Also, it is argued that arsenic speciation contained in water and soil may influence mobility, bioavailability, and transfer of arsenic in the presence of biochar due to soil chemistry variability, which is largely an under-investigated area in literature. Biochar interaction with soil microbes in immobilizing toxic arsenic species still needs to be explored. No study has so far dealt with cost-benefit analysis for biochar application as a water and soil decontamination method which can be considered a gap addressed in this study.
کلیدواژهها [English]
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