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Adsorption and Biodegradation in Biological Activated Carbon Treatment of Drinking Water

饮用水生物活性炭处理中的吸附和生物降解

基本信息

批准号：
04650841
负责人：
SAKODA Akiyoshi
金额：
$ 1.22万
依托单位：
University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (C)
财政年份：
1992
资助国家：
日本
起止时间：
1992 至 1993
项目状态：
已结题

项目摘要

In 1992, adsorption and biodegradation of organics in biological activated carbon(BAC)column were investigated by the moment analysis of the pulse response and the following was concluded.(i)The biodegradation rate of easily-biodegradable substances is independent of the biofilm support.(ii)The biodegradation rate of total organics is also independent of the biofilm support, although the faster rates were observed when the activated carbon is used for the biofilm support due to the existence of irreversibly-adsorbing substances.(iii)The adsorption capacity is significantly reduced by competitive adsorption of biodegradation products. It can be said that this approach is useful for measuring the adsorption properties and the bacterial activities in BAC separately.In 1993, the behavior of trihalomethane precursors met in BAC treatment was investigated and the following was concluded.(i)In BAC treatments, trihalomethane precursors included in raw water can be adsorbed and biodegraded, and also simultaneously fresh precursors can be generated by bacterial activities as metabolic products and autolysis products. Especially, the control of the latter precursor is crucial when applying BAC to drinking water treatment.(ii)A part of autolysis products of bacteria is non-biodegradable and easily adsorbed onto activated carbons. The trihalomethane formation potential in BAC treatment water is controlled by the behavior of this particular substances. A mathematical model describing the behavior of various trihalomethane precursors was proposed and successfully simulated the experimental results.The further investigations may include the so-called bioregeneration of the substances above mentioned. By introducing the kinetics of such bioregeneration into the present mathematical model, it can be a useful tool for designing and operating BAC for drinking water treatment on scientific basis.

1992年，利用脉冲响应的矩分析法研究了生物活性炭柱对有机物的吸附和生物降解。（i）易生物降解物质的生物降解速率与生物膜载体无关。（ii）总有机物的生物降解速率也与生物膜载体无关，尽管当活性炭用于生物膜载体时由于存在不可逆吸附物质而观察到更快的速率。（iii）生物降解产物的竞争吸附显著降低了吸附能力。1993年，我们对生物活性炭处理过程中遇到的三卤甲烷前体物的行为进行了研究，得出了以下结论：(i)In生物活性炭处理后，原水中含有的三卤甲烷前体物质可以被吸附和生物降解，同时细菌活动可以产生新鲜的前体物质作为代谢产物和自溶产物。特别是，后一种前体物的控制在BAC应用于饮用水处理时至关重要。(ii)A细菌的部分自溶产物是不可生物降解的，并且容易吸附在活性炭上。BAC处理水中三卤甲烷形成的可能性由这种特定物质的行为控制。提出了一个描述三卤甲烷前体物行为的数学模型，并成功地模拟了实验结果，进一步的研究可能包括上述物质的生物再生。通过将这种生物再生的动力学引入到本数学模型中，它可以为在科学的基础上设计和运行饮用水处理的BAC提供有用的工具。