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首页> 外文期刊>Current Science: A Fortnightly Journal of Research >Development of self-sustaining phototrophic granular biomass for bioremediation applications
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Development of self-sustaining phototrophic granular biomass for bioremediation applications

机译：开发用于生物修复的自持光养粒状生物质

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Natural aquatic biofilms (e.g. periphyton) play a major role in the degradation of conventional pollutants as well as xenobiotics that enter our aquatic systems. The remarkable ability of biofilms to degrade pollutants has been harnessed for purposes such as waste-water treatment. Recent developments in aerobic microbial granulation technology have brought about substantial improvements in biofilm-based remediation processes, offering several advantages such as high biomass retention, rapid biomass settling, high tolerance to toxicity, ability to withstand shock loading and low excess sludge production. We hypothesized that the diverse metabolic machinery and mixed microbial (bacterial, cyanobacterial and microalgal) functions of lotic biofilms could be exploited, if they can be successfully reproduced in the laboratory in the form of granular biomass. Accordingly, a method was developed for the cultivation of phototrophic aerobic microbial granules using bubble column photobioreactors. Mixed inoculum consisting of activated sludge and mixed microalgal cultures was added to column-type bubbled photobioreactors, which were operated in sequential batch mode with 24 h cycle time and 30% volumetric retention. Granulation of biomass was achieved within five weeks. The significance of the work is that it combines the advantages of both aerobic granular sludge and phototrophic biofilms. The bioreactors can be operated without addition of any external organic carbon source, as carbon fixation by the phototrophic elements can support the mixed microbial biomass in the reactor. This granular phototrophic mixed microbial biomass consortium has tremendous applications in environmental biotechnology, which was demonstrated by degrading a toxic model pollutant (phenol).
机译：天然水生生物膜（例如水生植物）在常规污染物以及进入我们水生系统的异生物素的降解中起主要作用。生物膜具有出色的降解污染物的能力，已用于废水处理等目的。有氧微生物制粒技术的最新发展已大大改善了基于生物膜的修复工艺，具有许多优势，例如高生物质保留能力，快速生物质沉降，对毒性的高耐受性，承受冲击负荷的能力和低过量污泥产生。我们假设，如果可以在实验室中以颗粒状生物质的形式成功繁殖出许多生物膜，则可以利用多种代谢机制和混合微生物（细菌，蓝细菌和微藻）功能。因此，开发了使用鼓泡柱光生物反应器培养光养性需氧微生物颗粒的方法。将由活性污泥和混合微藻培养物组成的混合接种物添加到柱型鼓泡光生物反应器中，以连续分批模式操作，循环时间为24小时，体积保留率为30％。在五周内实现了生物质的制粒。这项工作的意义在于，它结合了好氧颗粒污泥和光养生物膜的优点。生物反应器可以在不添加任何外部有机碳源的情况下运行，因为通过光养元素进行的碳固定可以支持反应器中混合的微生物生物量。这个颗粒状的营养营养型混合微生物生物质财团在环境生物技术中具有巨大的应用，这通过降解有毒模型污染物（苯酚）得到证明。

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