基于Feammox的生物膜反应器性能研究

发布时间：2018-01-12 12:19

本文关键词：基于Feammox的生物膜反应器性能研究　出处：《中国环境科学》2017年09期 　论文类型：期刊论文

【摘要】：铁还原氨氮氧化反应(Feammox)是近年来被证明在厌氧条件下由微生物驱动的氨氧化协同铁还原过程,为废水除氨提供了全新的思路.为了探究以Feammox建立生物膜反应器进行污水脱氮的可能,本研究通过接种Feammox菌落,在封闭条件下探讨了不同氨氮浓度对Feammox反应的影响,并在连续进水条件下构建基于Feammox的生物膜反应器研究其脱氮反应特征.结果表明,中(低)氨氮浓度有利于Feammox反应的发生,氨氮浓度为75mg/L时15d可达最高氨氮转化率41.49%.构建的基于Feammox的生物膜反应器连续运行90d,在进水氨氮浓度为75mg/L、水力停留时间为10d时,氨氮最高转化率达到33.78%;出水氮素和铁形态分析结果显示,氮素转化反应前期(10~60d)氨氮氧化产物为氮气,此阶段存在反硝化作用,后期(60~90d)氨氮氧化产物为硝态氮,此时反应器反硝化作用较弱;16Sr RNA测序结果显示,反应器内的Feammox反应主要由酸微菌和微小杆菌驱动.
[Abstract]:Iron reduction of ammonia oxidation (Feammox) is a recently proven ammonia oxidation under anaerobic conditions by microbial iron reduction process for CO removal of ammonia, provides a new way of thinking. In order to explore the establishment of Feammox biofilm reactor for possible wastewater denitrification, this research by inoculating Feammox colonies in the closed under the influence of different ammonia concentration on the reaction of Feammox, and in the continuous influent conditions on the construction of the denitrification reaction characteristics of biofilm reactor based on Feammox. The results showed that in (low) ammonia concentration for Feammox reaction, ammonia concentration was 75mg/L 15d showed the highest ammonia conversion rate of 41.49%. construction the biofilm reactor based on Feammox 90d, the influent ammonia concentration is 75mg/L, HRT is 10d, the highest nitrogen conversion rate reached 33.78%; the water nitrogen and iron speciation Analysis results show that nitrogen transformation in the early stage of the reaction (10~60d) ammonia oxidation products of nitrogen, denitrification exists in this stage, the late (60~90d) ammonia oxidation product of nitrate nitrogen, the reactor denitrification is weak; 16Sr RNA sequencing showed that the Feammox reaction in the reactor is mainly driven by small and micro acid bacteria coli.

【作者单位】：华南农业大学资源环境学院;环境保护部华南环境科学研究所国家环境保护城市生态环境模拟与保护重点实验室;
【基金】：国家自然科学基金资助项目(41501278) 广州市科技计划项目(2016201604040057) 广东省科技计划项目(2016B020242005)
【分类号】：X703
【正文快照】： 传统的废水除氮工艺由硝化反应和反硝化反应两个阶段组成,硝化阶段由好氧氨氧化细菌(AOB)在有氧的条件下,以氧气为电子受体,将NH4+氧化成NO2-[1],生成的NO2-进一步被亚硝酸盐氧化细菌(NOB)氧化成NO3-[2],从而完成硝化过程.反硝化阶段则由反硝化细菌将硝态氮还原成N2,使氮素从

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