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炮打总统府

金虫 (小有名气)

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A shortcut biological nitrogen removal (SBNR) process converts ammonium directly through nitrite to nitrogen gas, thus requiring less aeration and carbon. We evaluated a hybrid SBNR (HSBNR) reactor containing an anoxic tank followed by an aerobic tank and a settling tank. The aerobic tank was filled with polyvinyl alcohol sponge media (20%, v/v) to attach and retain ammonium oxidizers. Two configurations of the HSBNR reactor were tested for treating a wastewater with high strength ammonium and organic electron donor. The HSNBR reactors accumulated nitrite stably for 1.5 years and maintained a high free ammonia (FA) concentration (20–25 mg/L) and a low dissolved oxygen (DO) concentration (<1 mg/L) in the aerobic tank. Apparently, the biofilm carriers increased the solids retention time (SRT) for ammonium oxidizers, while high FAand low DO selected against nitrite oxidizers and promoted direct denitrification of nitrite in the aerobic tank. The significant amount of chemical
oxygen demand (COD) was removed by shortcut denitrification of nitrite in the anoxic tank.
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zuodg

铁杆木虫 (正式写手)

有为青年

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炮打总统府(金币+10, 翻译EPI+1): ★★★很有帮助 谢谢! 2012-01-31 21:33:11
短程生物脱氮(SBNR)是将氨气转化成亚硝酸盐后直接转化成氮气,因此耗氧量、碳消耗较少。我们设计一个混合型SBNR反应器(HSBNR),其包括厌氧池,其后连接着好氧池、沉淀池。好氧池内填充聚乙烯醇(20%,体积比)海绵介质,用以吸附、保留氨氧化剂。使用两种形态的HSBNR反应器处理含高浓度氨及有机电子供体的废水。经1年测试HSBNR反应器的好氧池内维持着较高浓度的游离氨(FA,20-25 mg/L)、较低浓度的溶氧(DO,<1 mg/L)。很显然,生物膜载体增加了胺氧化剂的固体保留时间(SRT)。另外一方面,高浓度的FA及较低的DO选定了亚硝酸盐氧化剂,促进了好氧池亚硝酸盐直接脱氮。SBNR反应器厌氧池显著降低了化学耗氧量(COD)。
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