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Performance improvement of a thermophilic sulfate-reducing bioreactor under acidogenic conditions: Effects of diversified operating strategies

机译:产酸条件下嗜热硫酸盐还原生物反应器的性能改进:多种操作策略的影响

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The establishment of a sulfidogenic environment under thermophilic (55 ℃) acidogenic conditions was assessed in an innovative structured-bed bioreactor to enhance sulfate removal and acetate production prior to methanogenesis. Diversified operating strategies, i.e., variations in the hydraulic retention time (HRT; 6-12 h), sulfate loading rate (SLR; 8-16 kg SO_4~(2-) m~(-3) day~(-1)) and liquid phase recirculation ratio (0.0-57.0) were assessed to both enable the establishment of sulfate-reducing conditions and remove H_2S from the liquid phase. Ethanol was used as the only carbon source. Applying a low HRT (6 h) as the initial operating strategy severely hindered the establishment of sulfate-reducing bacteria (SRB) populations within the system (sulfate removal < 27.5%). In turn, applying effluent recirculation had a positive impact on the system (sulfate removal ~ 60%) by providing an adequate buffer control along the entire height of the system, as well by displacing over 70% of the H_2S to the gaseous phase. The maintenance of pH values above 6.1 proved to be adequate for the sulfidogenic activity, whereas enhanced acidic conditions (pH < 6.0) at the basal portion of the reactor comprised a determining factor to hinder sulfate reduction. SRB were able to handle H_2S and acetate concentrations as high as 232 mg L~(-1) and 3111 mg L~(-1), respectively, after establishing an effective acidogenic/sulfidogenic environment, indicating that the proposed system has the potential to be used as the first stage in the anaerobic processing of sulfate-rich wastewater streams.
机译:在创新的结构化床生物反应器中评估了在嗜热(55℃)产酸条件下形成硫化物的环境,以增强甲烷生成之前硫酸盐的去除和乙酸盐的产生。多样化的操作策略,例如水力停留时间(HRT; 6-12 h),硫酸盐负载率(SLR; 8-16 kg SO_4〜(2-)m〜(-3)天〜(-1))的变化评估液相再循环比(0.0-57.0)既可以建立硫酸盐还原条件,又可以从液相中除去H_2S。乙醇被用作唯一的碳源。采用低HRT(6小时)作为初始操作策略严重阻碍了系统内硫酸盐还原细菌(SRB)种群的建立(硫酸盐去除率<27.5%)。反过来,通过在整个系统高度上提供足够的缓冲液控制,以及通过将超过70%的H_2S置换为气相,使废水再循环对系统具有积极的影响(硫酸盐去除率约为60%)。维持高于6.1的pH值足以满足硫化作用,而反应器底部的酸性条件增强(pH <6.0)是阻碍硫酸盐还原的决定性因素。在建立有效的产酸/生硫环境之后,SRB能够分别处理高达232 mg L〜(-1)和3111 mg L〜(-1)的H_2S和乙酸盐,这表明所提议的系统有潜力用作富硫酸盐废水流厌氧处理的第一阶段。

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