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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...
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