硫歧化生物硫化物提高了硫自养反硝化过程中硝酸盐的去除和N2O的产生。

IF 8.1 2区 环境科学与生态学 Q1 ENVIRONMENTAL SCIENCES
Zhikun Lu , Yifeng Xu , Chuanzhou Liang , Wenshan Guo , Huu Hao Ngo , Lai Peng
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引用次数: 0

摘要

硫自养反硝化(SADN)被认为是一种经济有效的硝酸盐污染水体生物修复技术。然而,硫的低生物利用度是阻碍氮去除效率的主要挑战。提出了硫自养歧化(SADP)过程,将硫转化为生物硫化物,大大增加了电子供体的可用性。在201天的实验室规模试验中,SADP工艺达到了理想的性能,其生物硫化物产量为198.87±39.8 mg S/L /d,可以为SADN工艺处理671.22±134.40 mg N/L/d的硝酸盐提供足够的电子供体。微生物群落分析证实了硫歧化菌(SDB)的存在和优势(如Desulfocaspa sp.,占整个微生物群落的8.27%),硫氧化菌(SOB)属是硫杆菌属(Thiobacillus),占整个群落的87.32%。进一步的实验表明,化学硫化物和生物硫化物的加入对SADN工艺的硝酸盐去除率分别提高了1.31和1.34倍。此外,生物硫化物被发现是最有效的一氧化二氮(N2O)缓释剂,在反硝化和反硝化过程中分别减少82%和95%的排放。结果表明,SADP和SADN一体化工艺是处理硝酸盐污染水的一种更有效和碳中性的替代方案。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Biogenic sulfide by sulfur disproportionation enhances nitrate removal and reduces N2O production during sulfur autotrophic denitrification

Biogenic sulfide by sulfur disproportionation enhances nitrate removal and reduces N2O production during sulfur autotrophic denitrification
Sulfur autotrophic denitrification (SADN) is regarded as a cost-effective bioremediation technology for nitrate-contaminated water. Nevertheless, the low bioavailability of sulfur is a major challenge that hinders nitrogen removal efficiency. A sulfur autotrophic disproportionation (SADP) process was proposed to convert sulfur to biogenic sulfide, greatly increasing the availability of electron donors. Throughout the 201-day laboratory-scale test, it was observed that the SADP process achieved desirable performance with 198.87 ± 39.8 mg S/L biogenic sulfide production per day, which could provide sufficient electron donors for the SADN process in treatment of 671.22 ± 134.40 mg N/L/d nitrate. Microbial community analysis confirmed the presence and dominancy of sulfur-disproportionating bacteria (SDB) (e.g., Desulfocaspa sp. taking up to 8.27% of the entire microbial community), while Thiobacillus was the most dominant genus of sulfur oxidizing bacteria (SOB), accounting for 87.32% of the entire community. Further experiments revealed that the addition of chemical and biogenic sulfides enhanced the nitrate removal rate of the SADN process by a factor of 1.31 and 1.34, respectively. Additionally, biogenic sulfide was found to be the most effective nitrous oxide (N2O) mitigator, reducing emission by 82% and 95% in denitrification and denitritation processes, respectively. The results demonstrated that the integrated SADP and SADN processes was a more effective and carbon-neutral alternative in treatment of nitrate-contaminated water.
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来源期刊
Chemosphere
Chemosphere 环境科学-环境科学
CiteScore
15.80
自引率
8.00%
发文量
4975
审稿时长
3.4 months
期刊介绍: Chemosphere, being an international multidisciplinary journal, is dedicated to publishing original communications and review articles on chemicals in the environment. The scope covers a wide range of topics, including the identification, quantification, behavior, fate, toxicology, treatment, and remediation of chemicals in the bio-, hydro-, litho-, and atmosphere, ensuring the broad dissemination of research in this field.
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