https://scholars.lib.ntu.edu.tw/handle/123456789/408383
標題: | Mitigating adverse impacts of varying sulfide/nitrate ratios on denitrifying sulfide removal process performance | 作者: | Chen C. Shao B. Zhang R.-C. Xu X.-J. Zhou X. Yuan Y. Ren N.-Q. Lee D.-J. |
關鍵字: | Aerobic biological oxidation; Denitrifying sulfide removal; Dissolved oxygen; Sulfur oxidizing bacteria | 公開日期: | 2018 | 卷: | 267 | 起(迄)頁: | 782-788 | 來源出版物: | Bioresource Technology | 摘要: | Complete removal of nitrogen, sulfur and carbon in wastewaters by denitrifying sulfide removal (DSR) process can be achieved at stoichiometry sulfide to nitrate ratio (S/N) of 1:1 in expanded granular sludge bed reactor. Wastewaters with varying S/N ratios can adversely impact the DSR performances with deterioration of synergetic cooperation between autotrophic and heterotrophic denitrifiers. DO (dissolved oxygen) serves effectively as supplementary electron receiver for sulfide oxidation, leaving more nitrate for heterotrophic denitrifiers to utilize acetate. The optimal oxygen to sulfide molar ratio (DO/S) is 0.5:1 for complete removal of sulfide, nitrate and acetate at different S/N ratios. The heterotrophic denitrification rate was decreased to 0.03 ± 0.002, 0.24 ± 0.011 and 0.35 ± 0.027 NO3 −-N·h−1·gVSS−1 at S/N ratio of 5:2, 5:5 and 5:8, respectively, when DO/S of 3:1 was performed. This optimal condition was proposed as an easy-to-implement control criterion for subsiding the adverse impact by varying S/N ratios in handling real wastewaters. © 2018 Elsevier Ltd |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/408383 | ISSN: | 09608524 | DOI: | 10.1016/j.biortech.2018.07.096 | SDG/關鍵字: | Aerobic bacteria; Denitrification; Dissolved oxygen; Nitrates; Sulfur compounds; Biological oxidations; Denitrifying sulfide removal; Expanded granular sludge bed reactor; Heterotrophic denitrification; Heterotrophic denitrifiers; Optimal conditions; Sulfur oxidizing bacteria; Synergetic cooperation; Nitrogen removal; nitrate; sulfide; thiosulfate; nitric acid derivative; sulfide; bioreactor; cation; denitrification; dissolved oxygen; microbial activity; oxic conditions; oxidation; pollutant removal; stoichiometry; sulfide; wastewater; wastewater treatment; Article; autotrophy; controlled study; denitrification; nonhuman; oxidation; oxygen concentration; priority journal; waste component removal; waste water management; bioreactor; denitrification; isolation and purification; sewage; Bioreactors; Denitrification; Nitrates; Sewage; Sulfides |
顯示於: | 化學工程學系 |
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