Xu Jinlan, Ding Keshuai, Yang Chengwei, Huang Tinglin
a School of Environmental and Municipal Engineering , Xi'an University of Architecture and Technology , Shaanxi Xi'an , People's Republic of China.
Environ Technol. 2019 Apr;40(11):1392-1400. doi: 10.1080/09593330.2017.1422552. Epub 2018 Jan 12.
The objective of this study is to find a comprehensive regulation for sulfide removal and elemental sulfur transformation based on the denitrifying sulfide removal process. The experiment was performed based on several influent sulfide concentrations (150-600 mg/L) and nitrate-to-sulfur (N/S) molar ratios (0.5-2.0) at reaction times of 24 and 48 h. Sulfide and nitrate removals were mainly dependent on the influent sulfide concentration at sulfide concentrations of 150-200 and 400-600 mg/L, but on the N/S ratio at sulfide concentrations of 250-350 mg/L. Up to 99.7% and 93.8% of sulfide and nitrate were removed, respectively, with 26.5% of elemental sulfur formed at sulfide concentrations of 250-350 mg/L (N/S of 1.0). Only 4-9.4% of elemental sulfur was formed, with sulfide and nitrate removals of 99.9% and 98.7%, respectively, at sulfide concentrations of 150-200 mg/L. Meanwhile, 46.9-94.7% of sulfate was formed with a nitrogen gas conversion rate of 18.2-57.1%. Fewer microorganisms were detected by fluorescence in situ hybridization (FISH) at high sulfide concentrations of 400-600 mg/L, suggesting that the processes of anaerobic denitrification and desulfurization were inhibited.
本研究的目的是基于反硝化除硫过程找到一种综合的硫化物去除和元素硫转化的调控方法。实验在几种进水硫化物浓度（150 - 600 mg/L）和硝酸盐与硫（N/S）摩尔比（0.5 - 2.0）条件下进行，反应时间分别为24小时和48小时。在硫化物浓度为150 - 200 mg/L和400 - 600 mg/L时，硫化物和硝酸盐的去除主要取决于进水硫化物浓度，但在硫化物浓度为250 - 350 mg/L时则取决于N/S比。在硫化物浓度为250 - 350 mg/L（N/S为1.0）时，分别有高达99.7%和93.8%的硫化物和硝酸盐被去除，同时形成了26.5%的元素硫。在硫化物浓度为150 - 200 mg/L时，仅形成4 - 9.4%的元素硫，硫化物和硝酸盐的去除率分别为99.9%和98.7%。与此同时，形成了46.9 - 94.7%的硫酸盐，氮气转化率为18.2 - 57.1%。在硫化物浓度为400 - 600 mg/L的高浓度条件下，通过荧光原位杂交（FISH）检测到的微生物较少，这表明厌氧反硝化和脱硫过程受到了抑制。
