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Microbial nitrate removal by waste iron shavings from the biological and catalytic ozonation treated dyeing and finishing wastewater

机译：废铁屑从生物和催化臭氧氧化处理的染整废水中去除硝酸盐的微生物

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摘要

The concentration of total nitrogen (TN) (between 40 and 60 mg/L, mainly nitrate) in the biological and catalytic ozonation treated dyeing and finishing wastewater needs to be reduced before discharge. The present study investigated the feasibility of using waste iron shavings as electron donor for nitrogen removal by biological denitrification. Two anoxic sequencing batch reactors (AnSBR) were continuously operated for more than 100 days. The results showed that the TN removal efficiency increased from 12% in the control reactor (AnSBR-C) to 20% in the reactor with waste iron shavings (AnSBR-Fe). The TN removal was mainly achieved by the reduction of nitrate by heterotrophic denitrification and autotrophic denitrification for AnSBR-Fe. The residual COD (38.4 mg/L) in the effluent of AnSBR-Fe was higher than that (22 mg/L) in the effluent of AnSBR-C, which could be due to that the bacteria preferred to use iron instead of the recalcitrant organics that present in the wastewater. Furthermore, 3DEEM, UHPLC-QTOF and GC–MS analysis were used to characterize the organics in the wastewater, and the results showed that the addition of waste iron shavings affected the degradation of organics during the biological denitrification process.
机译：经过生物和催化臭氧氧化处理的染整废水中的总氮（TN）浓度（40至60 mg / L，主要为硝酸盐）需要在排放前降低。本研究调查了使用废铁屑作为电子供体通过生物反硝化脱氮的可行性。两个缺氧顺序分批反应器（AnSBR）连续运行超过100天。结果表明，TN去除效率从对照反应堆（AnSBR-C）中的12％提高到带有废铁屑（AnSBR-Fe）的反应器中的20％。 TN去除主要是通过AnSBR-Fe的异养反硝化和自养反硝化还原硝酸盐来实现的。 AnSBR-Fe废水中的残留COD（38.4 mg / L）高于AnSBR-C废水中的残留COD（22 mg / L），这可能是由于细菌更喜欢使用铁代替顽固的细菌废水中存在的有机物。此外，使用3DEEM，UHPLC-QTOF和GC-MS分析来表征废水中的有机物，结果表明添加废铁屑会影响生物反硝化过程中有机物的降解。

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