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Slowly released carbon source from composite materials system for removing nitrate pollution in groundwater

机译：缓释复合材料系统中的碳源以去除地下水中的硝酸盐污染

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Chemoheterotrophic denitrification technologies using biopolymers as a solid carbon source and biofilm carriers have been widely trialed to remove nitrate from groundwater. Here, we use a polyhydroxyalkanoates (PHA) and cellulose blend as a slowly released carbon material, the performance of which was detected through static and dynamic experiments. In the static experiment, the carbon released from the straw, cob and bagasse was 66.95, 40.12 and 40.65 mg L?1, respectively. Results show that the straw possessed higher carbon content than the others. In the dynamic experiments, the PHA/cellulose blend exhibited excellent nitrate removal efficiency and less adverse effects in nitrite accumulation during stable operation. The nitrate nitrogen removal rate reduced from 99.80% to 73.13% as nitrate loading increased from 40 to 60 mg L?1. The microbial structure of a permeable reactive barrier (PRB) system was revealed by high-throughput sequencing analysis. Azospira, Rhizomicrobium and Acidovorax were found to be the predominant species in the PHA system after the system had stabilized. Our results highlight that the PHA/cellulose blend is an economically attractive carbon source with good denitrification performance.
机译：使用生物聚合物作为固体碳源和生物膜载体的化学营养型反硝化技术已被广泛尝试以去除地下水中的硝酸盐。在这里，我们使用聚羟基链烷酸酯（PHA）和纤维素共混物作为缓慢释放的碳材料，通过静态和动态实验检测其性能。在静态实验中，从稻草，玉米芯和蔗渣中释放的碳分别为66.95、40.12和40.65 mg L ？1 。结果表明，秸秆的碳含量高于其他秸秆。在动态实验中，PHA /纤维素混合物在稳定运行期间表现出出色的硝酸盐去除效率，并且对亚硝酸盐积累的不利影响较小。随着硝酸盐负荷从40 mg L增加到60 mg L ？1 ，硝酸盐氮的去除率从99.80％降低到73.13％。通过高通量测序分析揭示了可渗透反应性屏障（PRB）系统的微生物结构。在系统稳定后，发现 Azospira ， Rhizomicrobium 和 Acidovorax 是PHA系统中的主要物种。我们的结果表明，PHA /纤维素混合物是一种经济上有吸引力的碳源，具有良好的反硝化性能。

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