Assessment of biological activity and fate of organic compounds in a reactor for the measurement of biodegradable organic carbon in water.

F Ribas, J Frías, F Ventura, L Mohedano, F Lucena
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引用次数: 11

Abstract

A new, rapid method for the determination of biodegradable dissolved organic carbon (BDOC), especially suited to water industry needs, was recently proposed by the authors. This dynamic method measured the BDOC of circulating water continuously pumped over a biofilm attached to a special support (sinterized porous glass) that fills a system of two glass columns. The BDOC value corresponds to the difference in dissolved organic carbon (DOC) between inflow and outflow water samples. The analytical results are not significantly different from those of other bioassays that use indigenous bacteria, and the total duration of the analysis is less than 3 h. However, a problem common to all the BDOC methods based on attached bacteria is the extent to which the decrease in DOC during the BDOC analysis is due to true biodegradation or to adsorption of organic matter to the reactor. In the present study, a reasonable support is provided for the hypothesis that this decrease, at least in the dynamic method, is predominantly due to microbiological activity. After comparing the support (sinterized porous glass) with a good physical adsorbent (granular activated carbon), the influence of temperature, residual chlorine and sodium azide on the reactor performance was tested, and a sensitivity only attributable to biological activity was observed. Another set of experiments were performed to assess the fate and specific elimination of different organic substances, explicable assuming that biodegradation processes were involved.

测定水中可生物降解有机碳的反应器中有机化合物的生物活性和归宿的评价。
最近,作者提出了一种新的快速测定生物可降解溶解有机碳(BDOC)的方法,特别适合于水工业的需要。这种动态方法测量了连续泵送循环水通过附着在特殊支撑(烧结多孔玻璃)上的生物膜的BDOC,该生物膜填充了由两个玻璃柱组成的系统。BDOC值对应的是流入和流出水样中溶解有机碳(DOC)的差异。分析结果与使用本地细菌的其他生物测定没有显著差异,分析的总持续时间小于3小时。然而,所有基于附着细菌的BDOC方法的共同问题是,在BDOC分析过程中DOC的减少是由于真正的生物降解还是有机物吸附到反应器中。在目前的研究中,一个合理的支持假设,这种减少,至少在动态方法中,主要是由于微生物活性。通过将载体(烧结多孔玻璃)与良好的物理吸附剂(颗粒活性炭)进行对比,测试了温度、余氯和叠氮化钠对反应器性能的影响,并观察到仅归因于生物活性的敏感性。进行了另一组实验来评估不同有机物质的命运和特定消除,假设涉及生物降解过程,这是可以解释的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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