Organic and nitrogenous matter effects on the denitrification of saline and protein-rich effluents

Environmental Technology
C HuiliñirM Roeckel

Abstract

The separate effect of protein concentration, nitrate concentration and carbon/nitrogen (C/N) ratio on the rate and efficiency of nitrate reduction was studied in batch reactors fed with a mixture of a synthetic substrate and a saline protein-rich salmon-plant effluent. At a constant nitrate concentration (40 mg L(-1)), the specific rate of nitrate removal decreased by 60% with increasing initial protein concentration (392 to 1900 mg L(-1)) and ammonification prevailed under these conditions; meanwhile at a constant protein concentration (1104 mg L(-1)), the specific rate of nitrate removal increased 58 times with increasing nitrate concentrations (0.5 to 78 mg L(-1)) and denitrification was the main route for nitrate reduction. The C/N ratio had an inverse effect on the specific rate of denitrification; the latter ranged from 227 to 563 [mg NO3(-)-N (g VSS d)(-1)] for a C/N ratio of 163 to 16 [mg TOC (total organic carbon) (mg NO3(-)-N)(-1)], respectively. On the other hand, the ammonia production rate was proportional up to a C/N ratio of 150.

References

Sep 21, 2001·Water Environment Research : a Research Publication of the Water Environment Federation·E AspéM Roeckel
Jan 4, 2005·Bioresource Technology·Lucija FoglarMarija Vuković
Jun 5, 1995·Biotechnology and Bioengineering·J S AlmeidaM J Carrondo

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Citations

Nov 17, 2009·Applied Microbiology and Biotechnology·Utomo SudarnoClaudia Gallert

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