Efficiency Evaluations of Bacteria and Bio-products in Reducing Arsenic Toxicity in Soils
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Abstract
Microbial reduction of arsenic (As) plays an important role in arsenic (As) detoxification in contaminated soils. Arsenic reducing microorganisms i.e. isolate BPAs17 and FPAs24 were isolated from arsenic-contaminated soils, exhibited high potential in As resistance. In this study, therefore, the two isolates were used to test their effectiveness in soil-arsenic reduction. Preliminary study showed that liming for pH adjustment together with microbial application resulted in As reduction in all the treatments. Liming with BPAs17 application gave the highest reduction of As in soil. Therefore, isolate BPAs17 was used to evaluate its survival in three types of carriers. The results showed that mixed media (MMC) gave the highest BPAs17 population at all stages of incubation. From the results of the experiments, isolate BPAs17 was selected to mix with MMC to produce bio-product prototype. The bio-product was then used to test its effectiveness to reduce As in soils with initial As concentration of 50 mg/kg. The results showed that soil pH adjustment with the application of bio-product gave the highest reduction of As at both 7 and 30 days after incubation with the reduced values of only 24.7 and 20.8 mg/kg, respectively (reduction percentage of -50.6 and -58.5%, respectively). The results of the present investigation indicated that bio-product prototype could be applied for management of As contaminated soils.
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References
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