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:Tap water
Denitrification system:Sulfur-based autotrophic denitrification and heterotrophic denitrification
Denitrifying reactor:Membrane bioreactor (MBR)
Medium:Polyethersulfone (PES)
Culture taken from:Denitrifying bacteria obtained from a sulfur-packed column bioreactor
Organism (s) cultured:nan
Respiration:Anaerobic
Electron donor:Methanol; Elemental sulfur
Electron acceptor:Nitrate
Input NO3-N (mg/l):0.22
Nitrate removal rate (mg NO3-N/l/h):nan
Denitrification rate (gNO3-N removed/m3/day):0.22
Microorganisms identified:nan
Molecular tools:nan
Major findings:The membrane reactor was operated for 200 days without chemical cleaning at flux of 15-32 LMH. Autotrophic denitrifers were adversely inhibited at Cr(VI) concentrations of 5mg/L, which resulted in the denitrification rates lowered.
Authors:Sahinkaya et al., 2017
Title:A Novel Elemental Sulfur-Based Mixotrophic Denitrifying Membrane Bioreactor for Simultaneous Cr(VI) and Nitrate Reduction
Pubmed link:Link
Full research link:Link
Abstract:This study aims at investigating the simultaneous nitrate and chromate reduction by combining the advantages of sulfur-based autotrophic denitrification, heterotrophic denitrification and membrane bioreactor (MBR) technologies. A laboratory-scale MBR equipped with hydrophilic flat sheet polyethersulfone (PES) membranes (0.45?m) was used to evaluate the performance of mixotrophic denitrification at varying nitrate and Cr(VI) concentrations. Methanol was supplied at C/N (mg methanol/mg NO3--N) ratio of 1.33. In the absence of Cr(VI), almost complete denitrification of 50mg/L NO3--N was obtained and the methanol requirement (3.60±0.9mg COD/(mg NO3--N)) for heterotrophic denitrifiers, was quite close to the theoretical value (3.7mg COD/(mg NO3--N)). Around 54% of the influent nitrate was denitrified by heterotrophs and the rest (56%) was denitrified by autotrophic sulfur oxidizers. The effluent sulfate averaged around 200mg/L, which was below than the theoretical sulfate concentration if autotrophic denitrification process was used alone. Autotrophic denitrification activity completely ceased at 5mg/L Cr(VI), but heterotrophic denitrification did not show any inhibition. Almost complete chromate and nitrate reduction was observed at 1mg/L Cr(VI). MBR was operated for around 200days and a weekly physical membrane cleaning was enough at a flux of 15 LMH.