Sulfide-induced nitrate reduction in the sludge of an anaerobic digester of a zero-discharge recirculating mariculture system

Water Research
Yonatan SherJ van Rijn

Abstract

The anaerobic digester is a vital component in a zero-discharge mariculture system as therein most of the organic matter is mineralized and nitrogen-containing compounds are converted to gaseous N(2). Although denitrification is a major respiratory process in this nitrate-rich treatment stage, also sulfate respiration takes place and may cause undesirable high sulfide concentrations in the effluent water. To examine the effect of sulfide on nitrate reduction, in situ depth profiles of inorganic nitrogen and sulfur compounds were determined. Additionally, nitrate reduction was examined as a function of ambient sulfide concentrations in sludge collected from different locations in the anaerobic reactor. Depth profiles showed high concentrations of nitrate and low concentrations of sulfide and ammonia in the aqueous layer of the reactor. A sharp decrease of nitrate and an increase in sulfide and ammonia concentrations was measured at the water-sludge interface. Nitrate reduction was highest in this interface zone with rates of up to 8.05+/-0.57 micromol NO(3)(-)h(-1)g((sludge))(-1). Addition of sulfide increased the nitrate reduction rate at all sludge depths, pointing to the important role of autotrophic denitrification in the an...Continue Reading

References

Jul 28, 2004·Water Research·Jesús Reyes-AvilaJorge Gomez
Jun 30, 2006·Biotechnology and Bioengineering·Ricardo Beristain CardosoJim A Field
Oct 13, 2006·Antonie van Leeuwenhoek·Niels Peter RevsbechLars Peter Nielsen
Jan 24, 2007·Biotechnology and Bioengineering·A Evren Tugtas, Spyros G Pavlostathis

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Citations

Apr 8, 2010·Current Opinion in Biotechnology·Harold J SchreierKeiko Saito
Jul 25, 2009·Water Research·Guangming JiangZhiguo Yuan
Apr 21, 2010·FEMS Microbiology Ecology·Carsten Ulrich SchwermerAndreas Schramm
Aug 12, 2018·Applied and Environmental Microbiology·Andrew S BurnsFrank J Stewart

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