Abstract Two bioreactors were investigated as an alternative for the post-treatment of effluent from an upflow anaerobic sludge blanket (UASB) reactor treating domestic sewage, aiming at dissolved sulfide and methane removal. The bioreactors (R-control and R-air) were operated at different hydraulic retention times (HRT; 6 and 3 h) with or without aeration. Large sulfide and methane removal efficiencies were achieved by the microaerated reactor at HRT of 6 h. At this HRT, sulfide removal efficiencies were equal to 61% and 79%, and methane removal efficiencies were 31% and 55% for R-control and R-air, respectively. At an HRT of 3 h, sulfide removal efficiencies were 22% (R-control) and 33% (R-air) and methane removal did not occur. The complete oxidation of sulfide, with sulfate formation, prevailed in both phases and bioreactors. However, elemental sulfur formation was more predominant at an HRT of 6 h than at an HRT of 3 h. Taken together, the results show that post-treatment improved the anaerobic effluent quality in terms of chemical oxygen demand and solids removal. However, ammoniacal nitrogen was not removed due to either the low concentration of air provided or the absence of microorganisms involved in the nitrogen cycle.

中文翻译：

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微曝气生物反应器对污水处理UASB实际出水中溶解硫化物和甲烷去除的影响

摘要研究了两个生物反应器作为对处理生活污水的上流式厌氧污泥床（UASB）反应器出水进行后处理的替代方案，旨在去除溶解的硫化物和甲烷。生物反应器（R-对照和 R-空气）在不同的水力停留时间（HRT；6 和 3 小时）下运行，有或没有通气。微曝气反应器在 HRT 为 6 小时时实现了较高的硫化物和甲烷去除效率。在此 HRT 下，R-对照和 R-空气的硫化物去除效率分别为 61% 和 79%，甲烷去除效率分别为 31% 和 55%。在 HRT 为 3 小时时，硫化物去除效率分别为 22%（R-对照）和 33%（R-空气），并且没有发生甲烷去除。在两个相和生物反应器中，硫化物完全氧化并形成硫酸盐。然而，元素硫的形成在 HRT 为 6 小时时比在 HRT 为 3 小时时更为主要。综上所述，结果表明，后处理在化学需氧量和固体去除方面改善了厌氧废水的质量。然而，由于提供的空气浓度低或缺乏参与氮循环的微生物，氨氮没有被去除。