Abstract A comparison between a mixed aerobic-anoxic horizontal fixed-bed reactor (MAAFBR) and an aerobic horizontal fixed-bed reactor coupled with an anoxic vertical fixed-bed reactor (AHFBR-AVFBR) was made in order to evaluate the nitrogen removal behavior when nitrification and sulfide-driven autotrophic denitrification occurred in a single unit or spatially separated. Both systems achieved Total-N removal efficiencies (RE) higher than 89 %. Moreover, for both reactors, the effluent pH was affected for bicarbonate alkalinities lower than 250 mg CaCO3 L−1, decreasing the biogas desulfurization from 98 to 50 % in the MAAFBR and from 100 to 61 % in the AVFBR. Hydraulic retention times (HRTs) of 6, 8, 10 and 12 h did not affect the nitrification RE on the AHFBR, maintaining values higher than 99 %. In both cases, biogas desulfurization was achieved. However, results suggested that elemental sulfur (S0) was not predominantly formed due to the interference of oxygen. Such interference was more severe for the MAAFBR, in which the results implied diffusion of O2 and H2S between the aerobic and anoxic chambers.

中文翻译：

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结合沼气生物脱硫脱氮的两种不同固定床反应器配置的比较

摘要 比较好氧-缺氧混合卧式固定床反应器 (MAAFBR) 和好氧卧式固定床反应器与缺氧立式固定床反应器 (AHFBR-AVFBR) 相结合，以评估当硝化作用和硫化物驱动的自养反硝化作用发生在一个单元或空间上。两种系统都实现了高于 89% 的总氮去除效率 (RE)。此外，对于两个反应器，碳酸氢盐碱度低于 250 mg CaCO3 L-1 的出水 pH 值会受到影响，MAAFBR 中的沼气脱硫率从 98% 降低到 50%，AVFBR 中的沼气脱硫率从 100% 降低到 61%。6、8、10 和 12 小时的水力停留时间 (HRT) 不影响 AHFBR 上的硝化 RE，保持值高于 99%。在这两种情况下，都实现了沼气脱硫。然而，结果表明由于氧的干扰，元素硫（S0）并不是主要形成的。这种干扰对于 MAAFBR 更为严重，其中结果表明 O2 和 H2S 在好氧和缺氧室之间扩散。