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 wastewater
Denitrification system:Lithotrophic-heterotrophic denitrification
Denitrifying reactor:Membrane bioreactor (MBR)
Medium:Sulfur; Calcium carbonate; Powder activated carbon
Culture taken from:Activated sludge
Organism (s) cultured:nan
Respiration:Anoxic–anaerobic
Electron donor:Elemental sulfur
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:Sulfur-based carrier application to increased nitrogen removal effectiveness within the system. The sulfate that is produced as a by-product of sulfur-driven autotrophic denitrification was produced in low concentrations. An increase in elemental sulfur carriers resulted in an increase in nitrate removal.
Authors:Vo et al., 2018
Title:Nitrogen Removal by Sulfur-Based Carriers in a Membrane Bioreactor (MBR).
Pubmed link:Link
Full research link:Link
Abstract:Sulfur-based carriers were examined to enhance the nitrogen removal efficiency in a mixed anoxic?anaerobic-membrane bioreactor system, in which sulfur from the carrier acts as an electron donor for the conversion of nitrate to nitrogen gas through the autotrophic denitrification process. A total nitrogen removal efficiency of 63% was observed in the system with carriers, which showed an increase in the removal efficiency of around 20%, compared to the system without carriers. The results also indicated that the carriers had no adverse effect on biological treatment for the organic matter and total phosphorus. The removal efficiencies for chemical oxygen demand (COD) and total phosphorus (TP) were 98% and 37% in both systems, respectively. The generation of sulfate ions was a major disadvantage of using sulfur-based carriers, and resulted in pH drop. The ratio of sulfate in the effluent to nitrate removed in the system ranged from 0.86 to 1.97 mgSO?2-/mgNO?--N, which was lower than the theoretical value and could be regarded as due to the occurrence of simultaneous heterotrophic and autotrophic denitrification.