Abstract
In this study, two lab-scale UASB reactors were established to testify S0 recovery efficiency, and one of which (M-UASB) was improved from the previous T-UASB by shortening reactor height once S2− over oxidation was observed. After the height was shortened from 60 to 30cm, S0 recovery rate was improved from 7.4% to 78.8%, and while, complete removal of acetate, nitrate and S2− was simultaneously maintained. Meanwhile, bacterial community distribution was homogenous throughout the reactor, with denitrifying sulfide oxidization bacteria predominant, such as Thauera and Azoarcus spp., indicating the optimized condition for S0 recovery. The effective control of working height/volume in reactors plays important roles for the efficient regulation of S0 recovery during DSR process.
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