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首页> 外文会议>Membrane technology 2008 >CONTROLLING GASEOUS NITROGEN OXIDE EMISSIONS AND NITROGENREMOVAL PERFORMANCE IN HOLLOW FIBER MEMBRANE-AERATEDBIOFILM REACTORS
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CONTROLLING GASEOUS NITROGEN OXIDE EMISSIONS AND NITROGENREMOVAL PERFORMANCE IN HOLLOW FIBER MEMBRANE-AERATEDBIOFILM REACTORS

机译：控制中空纤维膜-厌氧生物膜反应器中的气相氮氧化物排放和脱氮性能

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A hollow fiber membrane-aerated biofilm reactor (HFMBR) was operated at elevatedrntemperature (30℃) and low bulk liquid dissolved oxygen (DO, <0.3 mg/l) to achieve nitritationrnfrom a synthetic, high-strength, nitrogenous wastewater. Rapid startup was achieved despite highrnammonia concentrations and stable nitritation was obtained for ～70 days, at which time nitriternoxidation was observed. Of the three corrective actions used to deter proliferation of nitriteoxidizingrnbacteria (NOBs), decreased oxygenation via reduction of the lumen pressure appearedrnto be the most effective. Microbial population analysis via fluorescence in-situ hybridizationrn(FISH) revealed biofilm aggregates throughout the reactor dominated by Betaproteobacterialrnammonia-oxidizing bacteria (AOBs) hybridizing with probe Nso1225. Nitrospira genus NOBsrnhybridizing with probe Ntspa662 were present only at the most downstream sampling location inrnthe reactor, where the biofilm developed latest in time when nitrite concentrations were high.rnBiomass sloughing and a pump failure resulted in conditions favorable for continued NOBrnproliferation. Nitrogen balancing revealed up to 10% of the ammonia oxidized was recovered asrngaseous nitrogen oxide emissions in the outlet gas (N_2O, NO, NO_2). Two short-term correctivernaction experiments (increased oxygenation, elevated pH) were insufficient to mitigate thesernemissions, demonstrating an emerging challenge for implementing low DO nitritation systemsrnfor nutrient removal.
机译：中空纤维膜曝气生物膜反应器（HFMBR）在高温（30℃）和低散装液体溶解氧（DO，<0.3 mg / l）下运行，以从合成的高强度含氮废水中获得亚硝化作用。尽管氨浓度高，但仍能快速启动，并且在约70天内获得稳定的硝化作用，此时观察到亚硝酸盐氧化作用。在用于阻止亚硝酸氧化细菌（NOBs）增殖的三种纠正措施中，通过降低管腔压力来减少氧合似乎是最有效的。通过荧光原位杂交（FISH）进行的微生物种群分析显示，整个反应器中的生物膜聚集体均由与探针Nso1225杂交的Betaproteobacterialrnammonia氧化细菌（AOB）占主导。用探针Ntspa662杂交的硝化螺菌属NOBsrn杂交仅出现在反应器的最下游采样位置，在亚硝酸盐浓度高的时候，生物膜最迟出现。氮平衡表明，高达10％的被氧化氨被回收为出口气体（N_2O，NO，NO_2）中的气态氮氧化物排放。两项短期纠正性实验（增加氧合作用，提高pH值）不足以减轻发电厂的排放，这表明在实施低DO硝化系统以去除营养物方面面临着新的挑战。

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