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首页> 外文会议>Water Environment Federation 75th annual technical exhibition amp; conference (WEFTEC 2002) >MEMBRANE DELIVERY OF HYDROGEN FOR AUTOTROPHIC DENITRIFICATION
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MEMBRANE DELIVERY OF HYDROGEN FOR AUTOTROPHIC DENITRIFICATION

机译：氢膜自养脱氮

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摘要

This research focused on the novel use of hollow fiber membrane modules for gas delivery inrnbiological denitrification using hydrogen-oxidizing bacteria. Autotrophic denitrification is arnbiological process that reduces nitrate to nitrogen gas using an inorganic carbon source.rnHydrogen gas is an electron donor and nitrate is the electron acceptor in the reaction. Thernspecific research objectives were to evaluate the hydrogen transfer characteristics of hollow fiberrnmembrane modules, and assess technical feasibility of a continuous bioreactor-membrane systemrnfor denitrification.rnLaboratory scale mass transfer tests were conducted using hollow fiber membrane modules andrnthe following mass transfer correlation was developed to design membrane modules forrnhydrogen dissolution into water:rnSh = 2.68 Rede/L1.02Sc0.33rnwhere, Sh is the Sherwood number, Re is the Reynolds number, de is the equivalent diameter ofrnthe membrane module, L is the length of the fibers and Sc is the Schmidt Number.rnContinuous flow studies indicated that a stable biofilm can be developed in a packed bed reactorrnto remove nitrate using hydrogen as the electron donor. Hydrogen gas was successfullyrndelivered to the reactor via the hollow fiber membrane gas transfer module without fouling.rnDissolved hydrogen concentrations indicate that the system did not experience hydrogenrnlimitations at detention times of 3.25 hours or greater. Membrane gas delivery appears to be arnviable technology for transferring hydrogen to water for autotrophic denitrificiation.
机译：这项研究集中于中空纤维膜组件在利用氢氧化细菌进行气体生物反硝化中的新型应用。自养反硝化是一种生物过程，利用无机碳源将硝酸盐还原为氮气。rn氢气是电子供体，硝酸盐是反应中的电子受体。具体的研究目标是评估中空纤维膜组件的氢传递特性，并评估连续生物反应器-膜系统脱氮的技术可行性。使用中空纤维膜组件进行实验室规模的传质测试，并开发以下传质相关性来设计膜氢溶解在水中的模量：rnSh = 2.68 Rede / L1.02Sc0.33rn其中，Sh是舍伍德数，Re是雷诺数，de是膜组件的等效直径，L是纤维的长度，Sc是施密特数字连续流动研究表明，可以在填充床反应器中形成稳定的生物膜，以使用氢作为电子给体除去硝酸盐。氢气通过中空纤维膜气体传输模块成功地输送到反应器中，没有积垢。溶解的氢气浓度表明，系统在滞留时间为3.25小时或更长的时间内不会受到氢气的限制。膜气体输送似乎是将氢转移到水中以进行自养反硝化的可行技术。

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