Enhanced elementary sulfur recovery in integrated sulfate-reducing, sulfur-producing rector under micro-aerobic condition

► Sulfate-reducing bacteria (SRB) and sulfide oxidation bacteria (SOB) were cultivated. ► Activities of SRB and SOB were manipulated using DO level in a single reactor. ► At DO = 0.10-0.12 mg l−1, removal efficiency for sulfate is 81.5% and S0 recovery is 71.8%.