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:Municipal wastewate
Denitrification system:Heterotrophic denitrification
Denitrifying reactor:Sequencing Batch Reactor (SBR)
Medium:Suspended culture
Culture taken from:Activated sludge
Organism (s) cultured:nan
Respiration:Anaerobic–aerobic
Electron donor:Ice-cream factory wastewater
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):3.28
Microorganisms identified:nan
Molecular tools:nan
Major findings:Results from the study validated the notion that external carbon source addition may serve as a suitable control variable to improve process performance.
Authors:Cappai et al., 2004
Title:Use of Industrial Wastewaters for the Optimization and Control of Nitrogen Removal Processes
Pubmed link:Link
Full research link:Link
Abstract:In this experimental study the characterization of 2 industrial wastewaters, coming from an ice cream production industry (IW1) and a beet-sugar factory (IW2), with respect to their readily biodegradable fraction and denitrification potential, has been performed. To this end physical-chemical and biological characterization methods, both anoxic and aerobic, were used. Moreover a pilot scale SBR fed with municipal wastewater was started to verify the effect of the gradual addition of the concentrated organic wastewaters during the anoxic phase. The SBR was initially fed only with a primary municipal wastewater, then the organic load was increased by adding to the feed, during the anoxic phase, a small amount of the IW1 (second period). Once the initial conditions were restored the load was again raised using the second industrial wastewater (IW2) (third period). With those additions the nitrogen removal efficiency increased from 26% to 50%, in the case of the IW1 and from 23% to 53% in the case of the wastewater IW2, without any negative effect on the global performance of the system. In addition, periodical kinetic studies of denitrification and nitrification in the SBR, were performed.