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:Wastewater from the stainless steel industry
Denitrification system:Heterotrophic denitrification
Denitrifying reactor:Sequencing Batch Reactor (SBR)
Medium:Suspended culture
Culture taken from:Activated sludge
Organism (s) cultured:nan
Respiration:Anaerobic
Electron donor:Methanol
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):29.8
Microorganisms identified:nan
Molecular tools:nan
Major findings:The high COD concentration of methanol enables for complete denitrification in the system. Calcium presence in the wastewater has a negative impact on the denitrification process.
Authors:Fernández-Nava et al., 2008
Title:Denitrification of wastewater containing high nitrate and calcium concentrations.
Pubmed link:None
Full research link:Link
Abstract:The removal of nitrate from rinse wastewater generated in the stainless steel manufacturing process by denitrification in a sequential batch reactor (SBR) was studied. Two different inocula from wastewater treatment plants were tested. The use of an inoculum previously acclimated to high nitrate concentrations led to complete denitrification in 6 h (denitrification rate: 22.8 mg NO 3 -N=g VSS h), using methanol as carbon source for a COD/N ratio of 4 and for a content of calcium in the wastewater of 150 mg/L. Higher calcium concentrations led to a decrease in the biomass growth rate and in the denitrification rate. The optimum COD/N ratio was found to be 3.4, achieving 98% nitrate removal in 7 h at a maximum rate of 30.4 mg NO 3 -N=g VSS h and very low residual COD in the effluent.