Response of the reactor performance and microbial community to a shift of ISDD process from micro-aerobic to anoxic condition
Journal
Chemosphere
Journal Volume
212
Pages
837-844
Date Issued
2018
Author(s)
Abstract
Micro-aerobic condition has proven to be effective in enhancing sulfide oxidation to elemental sulfur (S0) during integrated simultaneous desulfurization and denitrification process (ISDD). In this study we investigated and compared the performance and microbial community of ISDD process operating under initially anoxic, then micro-aerobic and finally switch back to anoxic condition. For all the three tested scenarios, comparable bioreactor performance in terms of sulfate (95.0 ± 4.4%, 90.6 ± 3.8%, 89.8 ± 3.5%) and nitrate (∼100%) removal was achieved. However, a shift of ISDD bioreactor from micro-aerobic to anoxic environment clearly increased the S0 production (30.6%), relative to that at initial anoxic condition (14.2%). Further anoxic bioreactor operation with different influent nitrate concentrations also obtained satisfactory performance particularly in terms of S0 production. Microbial community analysis results showed that functional microorganisms selectively enriched at micro-aerobic condition, particularly sulfide-oxidizing bacteria (SOB), could also function well and enhance S0 production when bioreactor switching from micro-aerobic to anoxic environment. We proposed that micro-aerobic strategy could function as a bio-selector and provide a new idea in functional microorganisms selectively enrichment for wastewater treatment. © 2018 Elsevier Ltd
Subjects
Anoxic; Bio-selector; Condition switchover; Integrated simultaneous desulfurization and denitrification process (ISDD); Micro-aerobic
SDGs
Other Subjects
Bioconversion; Bioreactors; Denitrification; Desulfurization; Nitrates; Sulfur compounds; Wastewater treatment; Anoxic; Bio-selectors; Micro aerobics; Simultaneous desulfurization and denitrification; Switchover; Aerobic bacteria; nitrate; sulfate; sulfide; sulfur; anaerobic digestion; anoxic conditions; bioreactor; denitrification; microbial community; oxidation; performance assessment; pollutant removal; wastewater treatment; analytic method; anoxia; Article; denitrification; desulfurization; micro aerobic technology; microbial community; oxidation; reactor operation; sampling; technology; waste water management; Bacteria (microorganisms)
Type
journal article