Development of biological arsenic removal from contaminated soil

砷的生物气化可以是从包括土壤在内的固体中修复砷的一种机制。他的研究证实，在厌氧分批培养条件下，污染场地土壤中的微生物对砷进行了生物甲基化（气化）。从分批培养中观察到大量毒性较小的单甲基胂的产生。本研究为生物气化砷净化土壤奠定了基础。通过土柱试验进一步考察了该工艺应用于砷生物修复的可行性。与间歇试验相似，砷在土柱中以单甲基胂为主要气体形态发生气化。土柱试验中砷的气化率较低。气化率可以通过添加一些其他厌氧牛粪为基础的微生物，这是生长在反应器中，并适应砷以前的生物增强。据观察，砷的气化率迅速增加后，增加到8倍。砷在环境中的命运尚不清楚。通过对挥发性砷在环境中的去向研究，介绍了砷生物修复技术的应用。

Biological gasification of arsenic can be a mechanism of arsenic remediation from solids including soil. his study confirmed biological methylation (gasification) of arsenic by microorganism present in soil of contaminated site under anaerobic batch culture condition. Production of considerable amount of less toxic monomethylarsine was observed from the batch culture. This observation established the platform of using the process of biological gasification of arsenic for soil clean up. Soil column tests were further conducted to observe the feasibility of practical application of this process for bioremediation of arsenic. Similar to batch test, arsenic gasification was observed in soil column with monomethylarsine as the main gaseous species. The observed rate of arsenic gasification was low in soil column test. The rate of gasification can be bioaugmented by adding some other anaerobic cow dung based microbes, which were grown in reactors and acclimated to arsenic previously. It was observed that gasification rate of arsenic was rapidly increased after augmentation up to 8 times. The fate of arsenic in the environment is not known yet. The application arsenic bioremediation can be introduced after investigation of the fate of volatile arsenic in the environment.