Integrated simultaneous desulfurization and denitrification (ISDD) process at various COD/sulfate ratios.
The integrated simultaneous desulfurization and denitrification (ISDD) is a novel treatment process to handle sulfate and nitrate-laden wastewaters of high loadings. This study experimentally explored the effect of COD/SO4(2-) ratio on the performance of ISDD process, particularly considering the complex interactions between sulfate-reducing bacteria (SRB), heterotrophic denitrifiers (hNRB) and autotrophic denitrifiers (aNRB). There existed an optimal COD/SO4(2-) ratio (=1.5:1 in the present study) to reach 100% SO4(2-) and NO3(-) removals and 42.6% S(0) recovery. At COD/SO4(2-)=1.5:1, the functional strains could form granules with high retention in the ISDD reactor. The microbial community analysis identified the SRB, hNRB and aNRB in the studied system, whose shifts correlated well with the noted ISDD performance change at different COD/SO4(2-) ratio. Interactions between different groups of bacteria and the possible strategy to enhance the ISDD performance were discussed.
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Chuan
C
Chen
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Lihong
L
Liu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan. Electronic address: djlee@ntu.edu.tw.
Duu-Jong
DJ
Lee
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Wanqian
W
Guo
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China. Electronic address: waj0578@hit.edu.cn.
Aijie
A
Wang
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Xijun
X
Xu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Xu
X
Zhou
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan.
Donghai
D
Wu
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Nanqi
N
Ren
D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D017931:DNA Primers / Q000235:genetics; D058440:Denitrification; D059013:Microbial Consortia; D009566:Nitrates / Q000032:analysis / Q000302:isolation & purification*; D012722:Sewage / Q000382:microbiology; D013431:Sulfates / Q000032:analysis / Q000302:isolation & purification*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000302:isolation & purification*; D018508:Water Purification / Q000379:methods*
D017931:DNA Primers; D009566:Nitrates; D012722:Sewage; D013431:Sulfates; D062065:Wastewater; D014874:Water Pollutants, Chemical
Carbon to sulfate ratio; Denitrification; Denitrifiers; Desulfurization; Sulfate-reducing bacteria