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 Denitrification
Denitrifying reactor:Bio-electrochemical reactor (BER) coupled with adsorber
Medium:Granular activated carbon or Silicone resin
Culture taken from:nan
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:The bio-electrochemical reactor (BER) coupled with adsorber process proposed in this study is promising process to remove nitrate and the insectcide isoprothiolane (IPT). A mathematical model was developed to evalute the performance of this system.
Authors:Feleke and Sakaibara., 2002
Title:A bio-electrochemical reactor coupled with adsorber for the removal of nitrate and inhibitory pesticide.
Pubmed link:Link
Full research link:Link
Abstract:In this study, the treatment characteristics of nitrate and toxic pesticide by a combined bioelectrochemical reactor (BER)/adsorption process was investigated. Experimental results showed that the disappearance of NO3- in BER was in accordance with the applied current. NO2- was not detected in the effluent, but the production of N2O was increased with increasing IPT loading. In the presence of IPT, up to 30% of the nitrate nitrogen consumed was converted to N2O, while more than 95% converted to N2 in the absence of IPT. In adsorption column, IPT was efficiently removed onto either granular activated carbon or silicone resin so as to meet the guideline value (40 microg/I) and to reduce the N2O accumulation. A simplified kinetic model that considers the sequential reduction of nitrate and inhibition of the N2O reduction step by pesticide as well as Langmuir adsorption isotherm was developed and used to evaluate the process performance. Theoretically predicted effluent concentrations were in good agreement with the observed results for nitrate, nitrite, N2O, N2 and IPT. It was considered that high removal performance of nitrate and pesticide by the combined process is attributable to high affinity of adsorbates for IPT in comparison with relatively large inhibition constant (Ki).