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Effect of fulvic acids with different characteristics on biological denitrification

机译：富含特征对生物脱氮的影响

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摘要

The influences of three fulvic acids, referred to as SAFA (purchased from Shanghai Aladdin Reagent Company), SRFA (Suwannee River Fulvic Acid from International Humic Substances Society (IHSS)) and PPFA (Pahokee Peat Fulvic Acid from IHSS), with different chemical composition, structure, hydrophobicity and aromaticity degree on biological wastewater denitrification were investigated. It was found that SAFA remarkably enhanced the denitrification performance, while SRFA and PPFA had no obvious effect. Mechanistic study revealed that SAFA remarkably improved the metabolism of a carbon source (glucose) by stimulating the activities of key enzymes (hexokinase, 6-phosphofructose kinase, glyceraldehyde-3-phosphate dehydrogenase (GAPDH), and pyruvate kinase) involved in glycolysis. The increase of glucose utilization resulted in the increase of intracellular NADH/NAD+ ratio that favored microbial denitrification. Meanwhile the bacterial growth was significantly improved in the presence of SAFA. Further studies revealed that SAFA also increased the activities of key denitrifying enzymes, including nitrate reductase (NAR), nitrite reductase (NIR), nitric oxide reductase (NOR), and nitrous oxide reductase (N2OR), thus enhancing the reduction of nitrate and transformation of its intermediates, especially nitrite and nitrous oxide. All the above positive effects posed by SAFA might be attributed to its lower molecular weight, less complex aromatic structures with predominantly aliphatic carbons and higher hydrophilicity than SRFA and PPFA, which lead to a more active interaction with denitrifying microorganisms via metabolism process regulation. A better knowledge of the relationship between molecular structure of fulvic acids and microbial denitrification activity may be of practical interest in the nitrogen cycle in nature's niches.
机译：三种富核酸的影响，被称为SAFA（从上海阿拉丁试剂公司购买），SRFA（来自国际腐殖质物质（IHSS）的Suwannee River Fulvic酸）和PPFA（来自IHSS的Pahokee Peat Fulvic酸），具有不同的化学成分研究了对生物废水反硝化的结构，疏水性和芳香性程度。有人发现，Safa显着提高了脱硝化性能，而SRFA和PPFA没有明显的效果。机械研究表明，SAFA通过刺激糖醇分解的关键酶（六酮酶，6-磷酸溶酶，甘油醛-3-磷酸脱氢酶（GAPDH）和丙酮酸激酶）来显着改善碳源（葡萄糖）的代谢。葡萄糖利用的增加导致了有利于微生物反硝化的细胞内NADH / NAD +比率的增加。同时，在Safa的存在下，细菌生长显着提高。进一步的研究表明，SAFA还增加了键硝化酶的活性，包括硝酸还原酶（NAR），亚硝酸盐还原酶（NIR），一氧化氮还原酶（NOR）和氧化二氮还原酶（N2OR），从而提高硝酸盐和转化的减少其中间体，特别是亚硝酸盐和氧化氮。 Safa占据的所有上述正面效果可能归因于其较低的分子量，较低的芳族结构，其主要是脂族碳的脂肪族和更高的亲水性，而不是SRFA和PPFA，这导致通过代谢过程调节的与反硝化微生物相互作用。更好地了解富酸和微生物反硝化活性的分子结构与微生物反硝化活性之间的关系可能对自然核心的氮循环中的实际兴趣。

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  • 来源
    《RSC Advances》 |2016年第18期|共9页
  • 作者

    Li Mu; Chen Yinguang; Su Yinglong; Wan Rui; Zheng Xiong;

  • 作者单位

    Tongji Univ Sch Environm Sci &

    Engn State Key Lab Pollut Control &

    Resource Reuse 1239 Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ Sch Environm Sci &

    Engn State Key Lab Pollut Control &

    Resource Reuse 1239 Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ Sch Environm Sci &

    Engn State Key Lab Pollut Control &

    Resource Reuse 1239 Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ Sch Environm Sci &

    Engn State Key Lab Pollut Control &

    Resource Reuse 1239 Siping Rd Shanghai 200092 Peoples R China;

    Tongji Univ Sch Environm Sci &

    Engn State Key Lab Pollut Control &

    Resource Reuse 1239 Siping Rd Shanghai 200092 Peoples R China;

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