Pressurized hydrogenotrophic denitrification reactor for small water systems.
The implementation of hydrogenotrophic denitrification is limited due to safety concerns, poor H2utilization and low solubility of H2gas with the resulting low transfer rate. The current paper presents the main research work conducted on a pressurized hydrogenotrophic reactor for denitrification that was recently developed. The reactor is based on a new concept suggesting that a gas-liquid equilibrium is achieved in the closed headspace of denitrifying reactor, further produced N2gas is carried out by the effluent and gas purging is not required. The feasibility of the proposed reactor was shown for two effluent concentrations of 10 and 1 mg NO3--N/L. Hydrogen gas utilization efficiencies of 92.8% and 96.9% were measured for the two effluent concentrations, respectively. Reactor modeling predicted high denitrification rates above 4 g NO3--N/(Lreactor·d) at reasonable operational conditions. Hydrogen utilization efficiency was improved up to almost 100% by combining the pressurized reactor with a following open-to-atmosphere polishing unit. Also, the potential of the reactor to remove ClO4-was shown.
Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel. Electronic address: epsztein@campus.technion.ac.il.
Razi
R
Epsztein
Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel.
Michael
M
Beliavski
Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel.
Sheldon
S
Tarre
Faculty of Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 32000, Israel.
Michal
M
Green
D019149:Bioreactors; D058440:Denitrification; D006859:Hydrogen; D009566:Nitrates; D014867:Water; D018508:Water Purification
D009566:Nitrates; D014867:Water; D006859:Hydrogen
Drinking water; Hydrogen utilization; Hydrogenotrophic denitrification; Nitrate removal; Nitrogen accumulation; Perchlorate removal