铁对反硝化脱硫运行效能影响:《环境科技》2012年03期

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铁对反硝化脱硫运行效能影响

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【摘要】:研究基于Fe2+可以刺激硫酸盐还原菌的活性,氢气又可以作为电子供体促进反硝化脱氮理论,考察了铁粉对同步反硝化脱硫运行效能的影响。在混养(主)、自养和异养(辅)条件下对比加入铁粉前后各种底物的代谢规律,结果表明:混养条件下加入铁粉前后,硫化物去除率均在99%以上,硝酸盐和乙酸盐的去除率分别为80%,90%和88%,62%。铁粉不影响碳、氮、硫的同步脱除,而且可以强化硫酸盐还原作用和反硝化作用,却使硫化物的去除时间延长2倍。经分析得知,铁粉的加入可以提高自养菌群的活性,进而提供氢气这种更容易被自养菌利用的电子供体将硝酸盐还原为氮气,使硫化物剩余。而且,Fe和H2O发生化学反应生成的Fe2+和氢气均能提高硫酸盐还原菌的活性,硫酸盐还原菌群和自养菌群之间可能存在一定的共生关系,Fe的加入会破坏这种共生关系。

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【作者单位】:水利论文-M |%C.SL;krq/s

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苏州科技学院环境工程与科学学院;哈尔滨工业大学市政环境工程学院;苏州高新区虎丘区环境监察大队;水利论文s&Of |b5c

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【关键词】:

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0引言制药制革、石油、食品发酵、纺织化工等行业,均产生了大量高浓度的含硫含氮废水,这类废水毒性大浓度高,处理不妥则会产生二次污染。据2009年环境状况公报统计,我国年排放含硫含氮有机污水废水量超过60亿t,仅有机物(COD)的排放量就超过300万t,占水体受纳污染物的10%以上水利论文$PD%G/\WkU+c|(f ^R

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