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Assessing carbon availability in bioelectrochemical systems for nitrate removal by environmental isolates

机译：评估生物电化学系统中的碳可用性，用于通过环境分离硝酸盐去除硝酸盐

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Nitrate (NO_3~-) is one of the most common targets for water quality control. High nitrate concentration in the water systems negatively impact human health and the environment. Excessive nitrate content in the aquatic environment led to a decrease in water quality, which can be evaluated from changes in color, odor, increased turbidity, and reduced levels of dissolved oxygen. Denitrification as a biological method of tackling nitrate pollution has been studied since three decades ago in various systems, including recent investigations into bioelectrochemical systems. Bioelectrochemical cells are driven by microorganisms in carrying out oxidation/reduction reactions such as denitrification. However, the popularity of BES is still low. This study aim to optimize the source of carbon as substrate in culture media for the system and compare the efficiency of nitrate elimination and denitrification rate among isolates and culture conditions. Axenic cultures of Pseudomonas entomophila and Acinetobacter oleivorans were done in 20 mL single-chambered Microbial Electrolysis Cells (MECs) equipped with graphite as anode and stainless steel mesh as cathode. Sodium acetate and sodium bicarbonate was used as carbon sources in the formulation of heterotrophic and mixotrophic media. Denitrification performance in bioelectrochemical cells was evaluated from the evolution of nitrate concentration in the medium and the growth of target microorganisms. Environmental isolates presented similar behavior on the medium supplemented with bicarbonate by reaching 68-69% maximum nitrate removal efficiency across all experiments, suggesting inability to carry out autotrophic denitrification. On the other hand, Pseudomonas aeruginosa reached 78% efficiency on acetate-only medium, suggesting a preference towards acetate as carbon source over bicarbonate. Environmental isolates presented an interesting potential of tolerating the potential inhibitory effects of sodium bicarbonate in the medium compared to Pseudomonas aeruginosa, which demonstrated inhibitory effects in this medium.
机译：硝酸盐（NO_3〜 - ）是水质控制最常见的目标之一。水系统中的高硝酸盐浓度对人体健康和环境产生负面影响。水生环境中过量的硝酸盐含量导致水质的降低，可以从颜色，气味，浊度增加和溶解氧水平降低的变化评估。自三十年前在各种系统中已经研究了作为解决硝态污染的生物学方法的反硝化，包括最近调查生物电化学系统。生物电化学电池在进行氧化/还原反应的微生物中驱动，例如脱硝化。然而，BES的普及仍然很低。本研究旨在优化碳作为系统培养基中的底物的源，并比较分离物和培养条件的硝酸盐消除和反硝化率的效率。在配备有石墨作为阴极的阳极和不锈钢网的20ml单腔微生物电解细胞（MEC）中，在20ml单腔微生物电解细胞（MEC）中进行了昆虫菌昆虫菌和AcineTophirans的轴烯培养物。乙酸钠和碳酸氢钠被用作异养和混纺介质的制剂中的碳源。从培养基中的硝酸盐浓度的演变和靶微生物的生长评估生物电化学细胞中的脱氮性能。环境分离物通过在所有实验中达到68-69％的最大硝酸盐去除效率，在补充有碳酸氢盐的培养基上呈现了类似的行为，表明无法进行自养反硝化。另一方面，假单胞菌铜绿假单胞菌在乙酸盐培养基上达到78％，表明乙酸盐偏好为碳源。与假单胞菌铜绿假单胞菌相比，环境分离物呈现了耐受碳酸氢钠在培养基中的潜在抑制作用的有趣潜力，这在该培养基中表现出抑制作用。

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