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:Saline wastewater
Denitrification system:Sulfur-driven denitrification (SDN) system
Denitrifying reactor:Batch culture
Medium:Sulphur granules
Culture taken from:Sludge from the tidal flats
Organism (s) cultured:nan
Respiration:nan
Electron donor:Elemental sulphur
Electron acceptor:Nitrate
Input NO3-N (mg/l):nan
Nitrate removal rate (mg NO3-N/l/h):8–50
Denitrification rate (gNO3-N removed/m3/day):nan
Microorganisms identified:nan
Molecular tools:nan
Major findings:In this sulfur-driven denitrification application in high saline wastewater plan validated that, salinity affects the pH of the reactor and the efficiency of denitrification is affected by the pH. Also at high temperatures denitrification ceases.
Authors:Koenig and Liu., 2004
Title:Autotrophic Denitrification of High–Salinity Wastewater Using Elemental Sulfur: Batch Tests
Pubmed link:Link
Full research link:Link
Abstract:The feasibility of autotrophic denitrification of a highsalinity wastewater using sulfur–oxidizing autotrophic denitrificants was studied. These autotrophic bacteria oxidize elemental sulfur to sulfate while reducing nitrate to elemental nitrogen gas, thereby eliminating the need for the addition of organic carbon compounds. A series of bench–scale batch tests was performed with synthetic and actual flue gas desulfurization (FGD) wastewater to examine the effects of various environmental and operational factors such as temperature, pH, high salinity, and potentially toxic substances on the rate of autotrophic denitrification using elemental sulfur. Specific denitrification rates of 6 to 8 mg nitrate–nitrogen (NO3—?N)/g volatile suspended solids (VSS)·h were obtained. The highest denitrification rates were found between pH 7.0 and 8.0 and a temperature of 30 8 C. The denitrification rate started to decrease above an osmotic pressure of 19 atm (approximately 70% of seawater), independent of the type of salt ions, and amounted to approximately 70% activity at the concentration of seawater. Polyphosphate or pyrophosphate could be used as the source of phosphorus instead of orthophosphate because the latter caused immediate calcium phosphate precipitation in the FGD wastewater. Inhibiting factors attributed to inorganic or organic compounds originating from coal combustion were discussed.