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首页> 外文期刊>African Journal of Biotechnology >Degradation of di-, tri-, tetra-, and pentachlorophenol mixtures in an aerobic biofilter
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Degradation of di-, tri-, tetra-, and pentachlorophenol mixtures in an aerobic biofilter

机译：好氧生物滤池中二氯，三氯，四氯和五氯苯酚混合物的降解

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Chlorophenols are highly toxic xenobiotic compounds, normally found in the effluents of many industries. Due to the high toxicity of these compounds, it is difficult to treat effluent streams containing high concentrations of chlorophenols. The aim of this work is to demonstrate the capabilities of an aerobic submerged filter previously characterized in the degradation of phenol and chlorophenols in the treatment of highly toxic di-, tri-, tetra- and penta- chlorophenols mixtures (200 - 800 mgL-1?as total phenols concentration). It is shown that the system is capable of treating up to 600 mgL-1?of total chlorophenols with excellent reduction values, and biodegradation rates (BDRs) between 87 - 97%, and 34 - 157 mgL-1?day-1, respectively (total organic carbon, TOC degradations up to 80%). In the case of the 800 mgL-1, a strong inhibition due to the high toxicity of the mixture was observed. The system reduced the influent toxicity (EC50 or toxic units) by 48 - 76%, even when the initial toxicities of the mixtures were in the range of 40 - 358 toxic units (classified as very toxic). The kinetics of the phenol and TOC degradation were characterized through a first order kinetic expression. The values of TPho, TOCo, k1?and k2?are reported for the biodegradation of the total phenols and for the TOC, respectively. A system with powerful capabilities in the treatment of industrial streams, contaminated aquifers or accidentally contaminated municipal wastewaters containing high quantities of chlorophenols, is described.
机译：氯酚是剧毒的异种生物化合物，通常在许多行业的废水中发现。由于这些化合物的高毒性，因此难以处理含有高浓度氯酚的废水。这项工作的目的是证明一种好氧浸入式过滤器的功能，该滤池以前以苯酚和氯酚的降解为特征，用于处理高毒性的二，三，四和五氯酚混合物（200-800 mgL-1）。 （以总酚浓度计）。结果表明，该系统能够处理高达600 mgL-1？的总氯酚，还原值极好，生物降解率（BDR）分别在87-97％和34-157 mgL-1？day-1之间。 （有机碳总量，TOC降解高达80％）。在800mgL-1的情况下，由于混合物的高毒性而观察到强烈的抑制作用。该系统将进水毒性（EC50或毒性单位）降低了48-76％，即使混合物的初始毒性在40-358毒性单位（被分类为极毒性）的范围内。通过一级动力学表达来表征苯酚和TOC降解的动力学。分别报告了总酚的生物降解和TOC的TPho，TOCo，k1？和k2？的值。描述了一种在处理含有大量氯酚的工业流，被污染的含水层或被意外污染的城市废水中具有强大功能的系统。

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