Hydrogenotrophic denitrification in a packed bed reactor: effects of hydrogen-to-water flow rate ratio.
Hydrogen dissolution and hydrogenotrophic denitrification performance were investigated in a lab-scale packed bed reactor (PBR) by varying the hydrogen flow rate and hydraulic retention time (HRT). The denitrification performance was enhanced by increasing the hydrogen flow rate and HRT as a result of high dissolved hydrogen concentration (0.39mg/L) and utilization efficiencies (79%). In this study, the hydrogen-to-water flow rate ratio (Q(g)/Q(w)) was found to be a new operating factor representing the two parameters of hydrogen flow rate and HRT. Hydrogen dissolution and denitrification efficiency were nonlinearly and linearly correlated with the Q(g)/Q(w), respectively. Based on its excellent linear correlation with denitrification efficiency, Q(g)/Q(w) should be greater than 2.3 to meet the WHO's guideline of nitrate nitrogen for drinking water. This study demonstrates that Q(g)/Q(w) is a simple and robust factor to optimize hydrogen-sparged bioreactors for hydrogenotrophic denitrification.
Lee
J W
JW
Department of Environmental Engineering, College of Science and Technology, Korea University, Jochiwon-eup, Yeongi-gun, Chungnam 339-700, Republic of Korea. jaewoo@korea.ac.kr
Lee
K H
KH
Park
K Y
KY
Maeng
S K
SK
D006859:Hydrogen / Q000737:chemistry*; D007700:Kinetics; D009566:Nitrates / Q000737:chemistry*; D012995:Solubility; D014867:Water / Q000737:chemistry*
D009566:Nitrates; D014867:Water; D006859:Hydrogen