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首页> 外文期刊>Bioprocess and Biosystems Engineering >Aerobic/anoxic post-treatment of anaerobically digested sewage sludge as an alternative to biological nitrogen removal from reject water
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Aerobic/anoxic post-treatment of anaerobically digested sewage sludge as an alternative to biological nitrogen removal from reject water

机译：厌氧消化的污水污泥的需氧/缺氧后处理可作为去除废水中生物氮的替代方法

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Stabilisation and biological nitrogen removal (BNR) of anaerobically digested sewage sludge were studied in a post-aeration reactor at pilot scale working under alternating anoxic-aerobic conditions. Digested sludge came from a two-stage anaerobic digestion (thermophilic + mesophilic). The best post-aerator performance was achieved when working at an HRT of 10 days (4 days aerobic; dissolved oxygen of 1.8 mg L-1) and VS content in the feed no lower than 6.7 g L-1. Free ammonia concentration values in the effluent above 1.5 mg N L-1 (around 150 mg NH4 (+)-N L-1 at pH 7) were necessary to promote the BNR over nitrite. Removal efficiencies up to 80 % NH4 (+)-N, 50-55 % total nitrogen and 15-20 % VS were recorded in this study, with no external addition of chemicals. A nitrogen mass balance revealed that the high percent of NH4 (+)-N assimilated in heterotrophic growth was counteracted with that released in ammonification and fermentation, leading to a NH4 (+)-N removal mainly related to biological nitritation/denitritation.
机译：在后曝气反应器中，在交替的缺氧-好氧条件下进行的曝气反应器中，研究了厌氧消化的污泥的稳定性和生物脱氮（BNR）。消化的污泥来自两阶段厌氧消化（嗜热+中温）。当在10天的HRT（需氧4天；溶氧为1.8 mg L-1）下工作时，最佳的曝气后性能达到最佳，进料中的VS含量不低于6.7 g L-1。高于1.5 mg N L-1（pH 7时约为150 mg NH4（+）-N L-1）的废水中的游离氨浓度值对于促进BNR超过亚硝酸盐是必需的。这项研究记录了去除效率高达80％NH4（+）-N，总氮50-55％和VS 15-20％的情况，而且没有外部添加化学物质。氮的质量平衡表明，异养生长中同化的高含量NH4（+）-N与氨化和发酵中释放的NH4（+）-N抵消，导致主要与生物硝化/反硝化作用相关的NH4（+）-N去除。

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