Evaluation of anammox biocathode in microbial desalination and wastewater treatment
Evaluation of anammox biocathode in microbial desalination and wastewater treatment
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DOI：
10.1016/j.cej.2018.02.088
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发表时间：
2018-06-15
影响因子：
15.1
通讯作者：
Brooks, John P.
中科院分区：
文献类型：
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作者：
Kokabian, Bahareh;Gude, Veera Gnaneswar;Brooks, John P.
本研究利用自养微生物厌氧氨氧化细菌作为微生物脱盐池(MDCs)中的可持续生物催化剂/生物催化剂，用于能量阳性废水的处理。我们报告了首次概念证明研究，证明厌氧氨氧化机制可以有益于在产生生物电的同时提供废水中的碳和氮化合物的同时去除。为了丰富和评价厌氧氨氧化的机理和在连续、间歇进水模式下的工艺性能，进行了一系列实验。在连续的间歇试验中，MDCs的库仑效率和废水中亚硝酸盐和氨氮的去除都有所提高。该系统的最大功率密度为0.092 Wm~(-3)(最大电流密度为0.814 am~(-3))，氨氮的去除效率可达90%以上。我们计算了Anammox生物催化室中亚硝酸盐还原的能斯特电势，并与实验值进行了比较。还对阳极室和阴极室中碳化合物和氮化合物的顺序去除进行了评估。在此基础上，研究了不同碳源和氨源浓度下，高浓度氮的抑制效果和微生物群落结构的变化，特别是厌氧氨氧化的存在。详细介绍了实验研究和微生物群落分析。
This study presents the use of an autotrophic microorganism, Anammox bacteria, as a sustainable biocatalyst/biocathode in microbial desalination cells (MDCs) for energy-positive wastewater treatment. We report the first proof of concept study to prove that anammox mechanism can be beneficial in MDCs to provide simultaneous removal of carbon and nitrogen compounds from wastewater while producing bioelectricity. A series of experiments were conducted to enrich and evaluate the anammox mechanism and the process performance in continuous, fed-batch mode conditions. Coulombic efficiency of MDCs and nitrite and ammonium removal of wastewater increased in successive batch studies. A maximum power density of 0.092 Wm(-3) (or a maximum current density of 0.814 Am-3) with more than 90% of ammonium removal was achieved in this system. We calculated the Nernst potential for the nitrite reduction in the anammox biocathode chamber and compared with experimental values. Sequential removal of carbon and nitrogen compounds in anode and cathode chambers respectively, was also evaluated. Further, the inhibition effect of high nitrogen concentrations and the variations in microbial community profiles, especially, anammox presence was studied at different carbon and ammonia concentrations. Experimental studies and microbial community analysis are presented in detail.