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Mechanism and effect insight on stabilizing biological S0 in sulfur-rich wastewater

Year: 2024
Type: article
Abstract: To improve the recovery rate of biological elemental sulfur(S0) in the simultaneous denitrification and sulfur removal process in sulfur wastewater, the effect and mechanism of stabilizing biological S0 in sulfur-rich wastewater were studied. The experiments were conducted using blockers to stable biological S0 in sulfur-rich wastewater(300 mg/L S2-) and sulfur-poor wastewater(200, 100 mg/L S2- ). It was found that in sulfur-rich wastewater, 68.79 mg/L of S0 was accumulated in the stable group (adding 30 mg/L blocker) at 60 h, which was 25.34 mg/L higher than that in the unstable group (adding 0 mg/L blocker), the S0 stability rate reached 58.31% and the S0 recovery rate was 36.84%. However, the S0 in sulfur-poor wastewater (200, 100 mg/L S2-) was unstable, the S0 stability rate was only 11.2%, 14.14%, and the S0 recovery rate was low (15.71%, 12.39%). It could be seen that the blockers stabilized the biological S0 in sulfur-rich wastewater. Additionally, the blockers were conducive to the accumulation of denitrifying bacteria and Thiobacillus denitrificans, and the high proportion of Thiobacillus denitrificans was conducive to stable S0 in sulfur-rich wastewater. The blockers inhibited the formation of thiosulfate and sulfate and made nitrate get more electrons(19.76 mmol/L more electrons in stable group than in unstable group), promoting the generation and stability of biological S0. This technology could provide a theoretical basis for the recovery and utilization of biological S0 in wastewater.
DOI: 10.19965/j.cnki.iwt.2023-0930
Authors: XU Jinlan, XUE Shujun, CAO Zezhuang, GONG Lixia, CAO Fen
Language: English
Subfield: Pollution
Open Access status: green
OpenAlex ID: W6944735100
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