Sign up & Download
Sign in

Denitrification of wastewater containing high nitrate and calcium concentrations

by Y. Fernández-Nava, E. Marañón, J. Soons, L. Castrillón
Bioresource Technology ()

Abstract

The removal of nitrate from rinse wastewater generated in the stainless steel manufacturing process by denitrification in a sequential batch reactor (SBR) was studied. Two different inocula from wastewater treatment plants were tested. The use of an inoculum previously acclimated to high nitrate concentrations led to complete denitrification in 6 h (denitrification rate: 22.8 mg NO3- -N / g VSS h), using methanol as carbon source for a COD/N ratio of 4 and for a content of calcium in the wastewater of 150 mg/L. Higher calcium concentrations led to a decrease in the biomass growth rate and in the denitrification rate. The optimum COD/N ratio was found to be 3.4, achieving 98% nitrate removal in 7 h at a maximum rate of 30.4 mg NO3- -N / g VSS h and very low residual COD in the effluent. © 2008 Elsevier Ltd. All rights reserved.

Cite this document (BETA)

Available from Bioresource Technology
Page 1
hidden
Page 2
hidden

Readership Statistics

18 Readers on Mendeley
by Discipline
 
 
 
by Academic Status
 
39% Student (Master)
 
22% Ph.D. Student
 
11% Professor
by Country
 
6% Japan

Sign up today - FREE

Mendeley saves you time finding and organizing research. Learn more

  • All your research in one place
  • Add and import papers easily
  • Access it anywhere, anytime

Start using Mendeley in seconds!

Already have an account? Sign in