Journal
BIORESOURCE TECHNOLOGY
Volume 99, Issue 17, Pages 7976-7981Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2008.03.048
Keywords
denitrification; SBR; high nitrate wastewater; calcium
Funding
- European Union [ECSC-7210-PR-358]
- Consejeria de Educacion y Ciencia, Principado de Asturias, Spain [FC-05-IB-130]
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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. (C) 2008 Elsevier Ltd. All rights reserved.
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