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Organic carbon coupling with sulfur reducer boosts sulfur based denitrification by Thiobacillus denitrificans
Science of the Total Environment ( IF 8.2 ) Pub Date : 2020-09-21 , DOI: 10.1016/j.scitotenv.2020.142445
Wen Hao , Jiao Zhang , Rui Duan , Peng Liang , Meng Li , Xiang Qi , Qingcheng Li , Panpan Liu , Xia Huang

Sulfur autotrophic denitrification utilizes elemental sulfur as the electron donor for nitrate removal from aquatic environments. Organic carbon could stimulate the conversion of sulfur and facilitates the S0-based denitrification process in the mix-trophic. In this study, the co-cultured system of sulfur reducer (Geobacter sulfurreducens) and Thiobacillus denitrificans was used to investigate that how organic carbon could boost the S0-based denitrification. The results showed that the rate of S0-based denitrification was improved with C/N ratio of 0.13 and this improvement continued even after the acetate was exhausted. Sulfur probe test and Raman analysis suggested that reduced sulfur species (Sx2-) were formed with the addition of organic carbon. The Sx2- could recombine with element sulfur and the bioavailability of S0 would be improved, as a result, the rate of S0-based denitrification increased as well. Nitrate reduction rate could further increase with the C/N ratio of 0.88, but it would decrease significantly when the C/N ratio increased to 1.50 as the high concentration of generated S2-. Our results provided explanations that why organic carbon addition would improve the bioavailability of S0 which could further promote the S0-dominant denitrification process.



中文翻译:

有机碳与减硫剂的结合可促进反硝化硫杆菌的硫基反硝化

硫的自养反硝化利用元素硫作为电子供体,从水生环境中去除硝酸盐。有机碳可以刺激硫的转化并促进混合营养中基于S 0的反硝化过程。在这项研究中,硫剂(Geobacter sulphreducens)和反硝化硫杆菌共培养系统用于研究有机碳如何促进基于S 0的反硝化。结果表明,当C / N比为0.13时,基于S 0的反硝化速率提高,并且即使在乙酸盐耗尽后,这种改进仍持续。硫探针测试和拉曼分析表明,还原的硫种类(S通过添加有机碳形成x 2-)。S x 2-可以与元素硫复合,S 0的生物利用度得到改善,结果,基于S 0的反硝化率也提高了。随着C / N比为0.88,硝酸盐还原率可以进一步提高,但是当C / N比增加至1.50时,由于高浓度的生成的S 2-,硝酸盐还原率会显着降低。我们的结果提供了解释,说明为什么添加有机碳会提高S 0的生物利用度,从而进一步促进S 0占优势的反硝化过程。

更新日期:2020-09-21
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