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 Hydrogen-dependent Denitrification
Denitrifying reactor:Anaerobic MBR coupled with a novel hydrogen delivery system
Medium:nan
Culture taken from:Wasted activated sludge (WAS)
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:Hydrogen-dependent denitrification is of significant interest due to its potential economic advantage over heterotrophic denitrification. A bubble-less hydrogen delivery system was used for efficient gas delivery by introducing gas-supersaturated feed water to a gas-consuming reactor.
Authors:Rezania et al., 2007
Title:Hydrogen-dependent denitrification of water in an anaerobic submerged membrane bioreactor coupled with a novel hydrogen delivery system.
Pubmed link:Link
Full research link:Link
Abstract:Hydrogen-dependent denitrification has gained significant attention due to its potential economic advantage over heterotrophic denitrification. However, effective hydrogen delivery and biomass retention under anaerobic conditions are significant challenges to implementation of this process. An innovative hydrogenotrophic denitrification system, that addresses these challenges, consisting of an anaerobic submerged membrane bioreactor (MBR) and a novel hydrogen delivery unit, was evaluated for removal of nitrate from a synthetic groundwater feed. The hydrogen delivery unit was designed to release hydrogen-supersaturated water to the reactor and was efficient in hydrogen delivery, providing complete mass transfer. The anaerobic submerged MBR was successful in both reducing nitrate from 25 mg NO(3)-Nl(-1) to below detection and separating biomass from treated water to produce effluent free of suspended solids. Nitrogen gas produced during denitrification was internally recycled to effectively achieve membrane scouring and reactor mixing. The total organic carbon was similar to that of the incoming feed water, averaging approximately 6 mgl(-1).