Biological Nitrogen Removal Database
A manually curated data resource for microbial nitrogen removal
Biological Nitrogen Removal Database
A manually curated data resource for microbial nitrogen removal
Influent:Synthetic water
Denitrification system:Autotrophic Denitrification
Denitrifying reactor:Bio-electrochemical reactor (BER) combined with microfiltration
Medium:Multiple-granular activated carbons
Culture taken from:Biofilm
Organism (s) cultured:nan
Respiration:Anaerobic
Electron donor:Hydrogen
Electron acceptor:Nitrate
Input NO3-N (mg/l):nan
Nitrate removal rate (mg NO3-N/l/h):nan
Denitrification rate (gNO3-N removed/m3/day):nan
Microorganisms identified:nan
Molecular tools:nan
Major findings:The proposed multi-cathode biofilm-electrode reactor (BER) combined with microfiltration (MF) is considered advantageous for the enhanced treatment of nitrate-polluted groundwater.
Authors:Prosnansky et al., 2002
Title:High-rate denitrification and SS rejection by biofilm-electrode reactor (BER) combined with microfiltration.
Pubmed link:None
Full research link:Link
Abstract:In this study, a multi-cathode biofilm-electrode reactor (BER) combined with microfiltration (MF) was investigated using a laboratory-scale experimental apparatus for treatment of nitrate-contaminated water. The multi-cathode electrodes were composed of multiple-granular activated carbons (GACs). GACs attached to each cathode to enlarge surface area of electrodes and to attach bacteria quickly and firmly. In BER, H2 gas is produced by applying electric current, which serves as an electron donor in biological reduction of nitrate to N2 gas. Since some suspended solids were escaping from BER, MF membrane with plate modules and a pore size of 0.2 mm was placed after BER. Experimental results demonstrated that it was possible to operate the multi-cathode BER with high denitrification rates and hydraulic retention time (HRT) as low as HRT=20 min. The denitrification rate was enhanced by 3–60 times in comparison with former studies. MF membrane successfully rejected the bacteria escaping from BER, so that the effluent concentration of SS was kept below 1 mg SS/l throughout the experiment. It was also possible to operate MF membrane at flux 2–9 times higher and pressure 2.5–31 times smaller than in former studies. This higher performance was mainly brought about by using biofilm and H2 gas as an electron donor. Also, an economic evaluation of BER/MF was included, showing the feasibility of this process. The present BER/MF process is considered advantageous for the enhanced treatment of nitrate-polluted groundwater.