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:Water from a closed reservoir
Denitrification system:Chemoautotrophic hydrogenotrophic denitrification
Denitrifying reactor:Continuous flow fixed film reactor
Medium:Microporous polypropylene hollow fiber membranes
Culture taken from:nan
Organism (s) cultured:nan
Respiration:Anaerobic
Electron donor:Hydrogen
Electron acceptor:Nitrate
Input NO3-N (mg/l):2263
Nitrate removal rate (mg NO3-N/l/h):312
Denitrification rate (gNO3-N removed/m3/day):nan
Microorganisms identified:nan
Molecular tools:nan
Major findings:Results obtained from this study indicate that membrane hydrogen transfer technology appears to be a viable technology for transferring hydrogen gas to water. Scaling up studies need to be performed.
Authors:Jahan et al., 2002
Title:Membrane Delivery of Hydrogen for Autotrophic Denitrification
Pubmed link:None
Full research link:Link
Abstract:This research focused on the novel use of hollow fiber membrane modules for gas delivery in biological denitrification using hydrogen-oxidizing bacteria. Autotrophic denitrification is a biological process that reduces nitrate to nitrogen gas using an inorganic carbon source. Hydrogen gas is an electron donor and nitrate is the electron acceptor in the reaction. The specific research objectives were to evaluate the hydrogen transfer characteristics of hollow fiber membrane modules, and assess technical feasibility of a continuous bioreactor-membrane system for denitrification. Laboratory scale mass transfer tests were conducted using hollow fiber membrane modules and the following mass transfer correlation was developed to design membrane modules for hydrogen dissolution into water: Sh = 2.68 Rede/L1.02Sc 0.33 where, Sh is the Sherwood number, Re is the Reynolds number, de is the equivalent diameter of the membrane module, L is the length of the fibers and Sc is the Schmidt Number. Continuous flow studies indicated that a stable biofilm can be developed in a packed bed reactor to remove nitrate using hydrogen as the electron donor. Hydrogen gas was successfully delivered to the reactor via the hollow fiber membrane gas transfer module without fouling. Dissolved hydrogen concentrations indicate that the system did not experience hydrogen limitations at detention times of 3.25 hours or greater. Membrane gas delivery appears to be a viable technology for transferring hydrogen to water for autotrophic denitrificiation.