Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 8, Pages 3291-3296Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2007.07.006
Keywords
ASO reactor; anoxic sulfide biooxidation; anoxic nitrite removal; optimum pH; pH tolerance range
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The effects of pH on the performance of anoxic sulfide oxidizing (ASO) reactor were evaluated. Performance was investigated under various operational conditions at influent pH range of 4-11. At the influent pH of 7-7.5 during loading tests and HRT tests, the sulfide oxidation was partial. In general, the amount of sulfate formed decreased with the increasing sulfide and nitrite loadings. The bacterial communities in ASO reactors were more sensitive to acidic pH compared with alkaline pH, as nitrite and sulfide removal rates dropped significantly when exposed to acidic pH 3. High dissolved bisulfide ions, nitrite and excess of sulfate (> 300 mg/L) might have inhibited the sulfide oxidation under highly acidic and alkaline conditions in the ASO reactor. Based on sulfide and nitrite removal efficiencies, the ASO reactor can be operated in a wide range of pH, i.e. 5-11. (c) 2007 Elsevier Ltd. All rights reserved.
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