Effect of Bicarbonate on the Performance of Hydrogen-based Denitrification at Different Hydraulic Retention Times
Effect of Bicarbonate on the Performance of Hydrogen-based Denitrification at Different Hydraulic Retention Times
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DOI：
10.2521/jswtb.56.33
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Suphatchai Rujakom;Kenta Shinoda;T. Singhopon;Mai Nakano;T. Kamei;F. Kazama
中科院分区：
文献类型：
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作者：
Suphatchai Rujakom;Kenta Shinoda;T. Singhopon;Mai Nakano;T. Kamei;F. Kazama
碳酸氢盐(HCO3)可作为氢基反硝化的无机碳源。由于HCO3被认为可以加速NO2的还原速率，本研究试图使用不同数量的HCO3来最小化HD系统的水力停留时间(HRT)：不足的、适中的和充足的。结果表明，在不适当的短水力停留时间下，NO2的去除量很低，尽管补充了大量的HCO3，但HD的效率很低。HCO3有助于NIRS基因细菌的快速驯化，导致较高的NO2还原速率，并有助于改变细菌群落。多伊埃拉种。在HCO3充足的条件下，优势菌最多，在HRT为8~24 h时可获得较高的HD效率，而在HCO3缺乏和适中的系统中，通过红景天科、产碱科和黄单胞菌的协同作用，可获得令人满意的效率。近红外光谱(NIRS)基因的丰度与海燕属(Thauera spp.)有很强的相关性。也被发现了。本研究结果揭示了利用HCO3富集含NIRS基因的氢氧化反硝化菌以减少NO2积累以提高HD效率的重要性。
Bicarbonate (HCO3) can be used as an inorganic carbon source for hydrogen-based denitrification (HD). Since HCO3 is considered to accelerate the NO2 reduction rate, this study is attempted to minimize the hydraulic retention time (HRT) of HD systems using varied amounts of HCO3: deficient, moderate, and abundant amounts. The results implied that a low NO2 amount was removed at unsuitably short HRTs, resulting in poor HD efficiency despite being supplemented with abundant HCO3 amounts. HCO3 assisted in rapidly acclimatizing the bacteria having nirS gene, causing higher NO2 reduction rate and aided in changing the bacterial communities. Thauera spp. were the most dominant bacteria in abundant HCO3 conditions, achieving high HD efficiency at 8 to 24 h HRT whereas satisfactory efficiency was achieved in the deficient and moderate HCO3 amountsystems through the collaboration of Rhodocyclaceae, Alcaligenaceae, and Xanthomonadaceae as predominant bacteria in the community. A strong correlation between the abundance of nirS gene and Thauera spp. was also found. The findings in this study revealed the importance of using HCO3 for the enrichment of H2-oxidizing denitrifiers containing nirS gene in order to reduce NO2 accumulation to enhance the HD efficiency.