双膜曝气生物膜反应器除水中硝氮和高氯酸盐

发布时间：2018-01-02 17:15

本文关键词：双膜曝气生物膜反应器除水中硝氮和高氯酸盐　出处：《中国环境科学》2016年10期 　论文类型：期刊论文

【摘要】：构建了一种以CO_2为唯一碳源的膜曝气氢基质生物膜反应器(H_2-MBf R)对模拟地下水中2种主要的氧化型无机无污染物(NO_3~--N和ClO_4~-)进行生物还原去除.通过膜曝气方式使CO_2起到提供碳源和调节反硝化过程中pH值跃升的双重作用,克服了传统方法所带来的二次污染和运行成本增加的问题.通过调整H_2和CO_2压力能够实现对反应器出水pH值的较为稳定的控制,当CO_2压力分别为0.05MPa和0.08MPa 2个阶段时,在平均NO_3~--N和ClO_4~-进水浓度分别为20.73mg/L和10.57mg/L条件下,两阶段出水平均pH值分别为8.45和8.06,NO_3~--N和ClO_4~-去除率均大于95%;当第3阶段CO_2压力提升至0.12MPa时,平均出水pH值下降至6.93,此时NO_3~--N和ClO_4~-去除通量明显降低.而提供过量的CO_2会导致在偏酸性条件下甲烷化过程的产生,从而会导致其对H_2的负面消耗进而使目标污染物的还原速率下降.因此,合理控制CO_2压力使反应体系pH值维持在中性偏碱性条件下有利于NO_3~--N和ClO_4~-还原过程的高效进行.
[Abstract]:A membrane aerated hydrogen matrix biofilm reactor (H2-MBf R) with CO_2 as the sole carbon source was constructed for the treatment of two main oxidized inorganic pollutants in simulated groundwater. Through membrane aeration, CO_2 can provide carbon source and adjust pH jump in denitrification process. It overcomes the problems of secondary pollution and increased operation cost brought by traditional method. By adjusting the pressure of H2 and CO_2, the effluent pH value of reactor can be controlled stably. When the CO_2 pressure is 0.05MPa and 0.08MPa, respectively. The average NO_3~--N and ClO4- influent concentration were 20.73 mg / L and 10.57 mg / L, respectively. The average pH values of effluent in the two stages were 8.45 and 8.06 respectively. When the CO_2 pressure increased to 0.12 MPA in the third stage, the average effluent pH value decreased to 6.93. At this time, the NO_3~--N and CIO _ 4 removal fluxes were significantly decreased, and the methanation process under the condition of partial acidity would be induced by the excessive supply of CO_2. This will lead to its negative consumption of H2 and then reduce the reduction rate of the target pollutants. Reasonably controlling the pressure of CO_2 to maintain the pH value of the reaction system under neutral and alkaline conditions is beneficial to the efficient implementation of the reduction process of NO_3~--N and CIO _ 4.
【作者单位】：同济大学环境科学与工程学院污染控制与资源化研究国家重点实验室;
【基金】：国家自然科学基金资助项目(51378368)
【分类号】：X703
【正文快照】： 硝酸盐(NO3--N)和高氯酸盐(Cl O4-)是2种常见的无机氧化态污染物,常存在于城市污水、工业废水、地表水、地下水等各类污染水体中.水中NO3--N的污染主要来源于农业生产中化肥和农药的过多使用,以及工业废水和生活污水的排放[1].饮用水中NO3--N浓度过高,会诱发产生一些亚硝胺类

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