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首页> 外文会议>Sixth International in Situ and On-Site Bioremediation Symposium, 6th, Jun 4-7, 2001, San Diego, California >IN SITU BIOTREATMENT OF PERCHLORATE AND CHROMIUM IN GROUNDWATER
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IN SITU BIOTREATMENT OF PERCHLORATE AND CHROMIUM IN GROUNDWATER

机译：原位生物处理地下水中的高氯酸盐和铬

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A bench-scale treatability study was implemented to evaluate the feasibility of in situ biological treatment for perchlorate (C1O_4~-)- and hexavalent chromium [Cr(VI)]-contaminated groundwater at a solid rocket fuel manufacturing facility. Traditional batch and intermittent continual flow bioreactors were used to evaluate two media (sand and gravel) and four electron donors (acetate, molasses, composted manure, and concentrated fruit juice). Both acetate and molasses were effective electron donors during the bench-scale study. Because molasses costs less than acetate, molasses will be recommended for use in a planned pilot- or full-scale system. It was found that acetate may be required to initiate the treatment system, but molasses would be used as the long-term electron donor. No specialized consortia of microorganisms are required to innoculate the subsurface when initiating the in situ treatment system. Indigenous microorganisms can be acclimated to support an in situ ClO_4~- biotreatment system. Furthermore, there was no evidence of media plugging or fouling since the inception of the bench-scale study. ClO_4~- concentrations were regularly reduced at rates ranging from 200 to 600 mg/L/d. As a result, the bioreactive zone for ClO_4~--contaminated groundwater (1,500 mg/L) in an aquifer with a relatively high conductivity (1 ft/day) would only extend 2.5 to 7.5 feet downgradient of the amendment application. C1O_4~- reduction below method detection limits would take 2.5 to 7.5 days. Despite its potential toxic effects, Cr(VI) concentrations used in the study did not inhibit ClO_4~- reduction as it was routinely reduced to below method detection limits within minutes.
机译：进行了台式可处理性研究，以评估在固体火箭燃料生产设施中原位生物处理高氯酸根（C1O4〜-）-和六价铬[Cr（VI）]污染的地下水的可行性。传统的间歇式和间歇式连续流动生物反应器用于评估两种介质（砂和砾石）和四种电子供体（乙酸盐，糖蜜，堆肥和浓缩果汁）。在基准规模研究中，乙酸盐和糖蜜都是有效的电子供体。由于糖蜜的成本低于乙酸盐，因此建议将其用于计划的中试或全规模系统。已经发现，可能需要乙酸盐来引发处理系统，但是糖蜜将用作长期的电子给体。启动原位处理系统时，不需要专门的微生物群落接种地下物质。可以使土著微生物适应环境，以支持原位ClO_4〜-生物处理系统。此外，自开展台式研究以来，没有证据表明介质堵塞或结垢。 ClO 4-的浓度有规律地降低，范围为200至600 mg / L / d。结果，具有较高电导率（1 ft / day）的含水层中ClO_4〜被污染的地下水（1,500 mg / L）的生物反应区只会使修正申请的降级幅度降低2.5至7.5英尺。 C1O_4〜-降低到检测限以下需要2.5到7.5天。尽管有潜在的毒性作用，但本研究中使用的Cr（VI）浓度并未抑制ClO_4〜-的还原，因为它在数分钟内被常规还原至方法检测限以下。

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