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:Autotrophic denitrification
Denitrifying reactor:Column packed-bed reactor
Medium:Sulfur granules
Culture taken from:Anoxic sludge tank
Organism (s) cultured:nan
Respiration:Anaerobic
Electron donor:Elemental sulfur-limestone
Electron acceptor:Nitrate
Input NO3-N (mg/l):0.1
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 concentration of chromate did not adversely affect the rate of denitrification in both denitrifcation systems. At high nitrate loading rates the heterotrophic denitrification systems performed better than autotrophic denitrication system.
Authors:Sahinkaya and Kilic., 2014
Title:Heterotrophic and Elemental-Sulfur-Based Autotrophic Denitrification Processes for Simultaneous Nitrate and Cr(VI) Reduction
Pubmed link:Link
Full research link:Link
Abstract:Nitrate and chromate can be present together in water resources as nitrate is a common co-contaminant in surface and ground waters. This study aims at comparatively evaluating simultaneous chromate and nitrate reduction in heterotrophic and sulfur-based autotrophic denitrifying column bioreactors. In sulfur-based autotrophic denitrification process, elemental sulfur and nitrate act as an electron donor and an acceptor, respectively, without requirement of organic supplementation. Autotrophic denitrification was complete and not adversely affected by chromate up to 0.5 mg/L. Effluent chromate concentration was <50 ?g/L provided that influent chromate concentration was ?0.5 mg/L. Heterotrophic denitrification performance was not adversely affected even at 20 mg/L chromate and complete chromate reduction was attained up to 10 mg/L. Although autotrophic denitrification rate was much lower compared with heterotrophic one, it may be preferred in drinking water treatment due to the elimination of organic supplementation and the risk of treated effluent contamination.