Work

Sulfide-induced dissimilatory nitrate reduction to ammonia in anaerobic freshwater sediments

Year: 1996

Type: article

Abstract: Different reduced sulfur compounds (H2S, FeS, S2O32−) were tested as electron donors for dissimilatory nitrate reduction in nitrate-amended sediment slurries. Only in the free sulfide-enriched slurries was nitrate appreciably reduced to ammonia (), with concomitant oxidation of sulfide to S0 (). The initial concentration of free sulfide appears as a factor determining the type of nitrate reduction. At extremely low concentrations of free S2− (metal sulfides) nitrate was reduced via denitrification whereas at higher S2− concentrations, dissimilatory nitrate reduction to ammonia (DNRA) and incomplete denitrification to gaseous nitrogen oxides took place. Sulfide inhibition of NO- and N2O- reductases is proposed as being responsible for the driving part of the electron flow from S2− to NH4+.

Source: FEMS Microbiology Ecology

DOI: 10.1111/j.1574-6941.1996.tb00340.x

Authors: R.C. Brunet, L.J. Garcia-Gil

Institution: Universitat de Girona

Language: English

Topic: Wastewater Treatment and Nitrogen Removal

Subfield: Pollution

Field: Environmental Science

Domain: Physical Sciences

Open Access status: bronze

Funder: Universitat de Girona

OpenAlex ID: W2040154656