Biological nutrient removal from synthetic wastewater containing 2,4 dichlorophenol in a sequencing batch reactor


Uygur A. , Kargi F.

ENVIRONMENTAL ENGINEERING SCIENCE, vol.21, no.5, pp.569-574, 2004 (Journal Indexed in SCI) identifier identifier

  • Publication Type: Article / Article
  • Volume: 21 Issue: 5
  • Publication Date: 2004
  • Doi Number: 10.1089/ees.2004.21.569
  • Title of Journal : ENVIRONMENTAL ENGINEERING SCIENCE
  • Page Numbers: pp.569-574

Abstract

Nutrient removal from synthetic wastewater was investigated using a four-step sequencing batch reactor (SBR) at different 2,4 dichlorophenol (DCP) concentrations. The nutrient removal process consisted of anaerobic, oxic, anoxic, and oxic phases with hydraulic residence times (HRT) of 1/3/1/1 h and a settling phase of 45 min. Solids retention time (SRT) was kept constant at 10 days in all experiments. Initial dichlorophenol concentrations were varied between 0 and 240 mg/L at eight different levels. Effects of dichlorophenol on removal of COD, NH4-N, and PO4-P and on effluent nutrient concentrations were investigated. Dichlorophenol was almost completely degraded up to 123 mg/L influent concentration. Adverse effects of dichlorophenol on COD removal were almost negligible for DCP concentrations below 123 mg/L. About 96% COD, 46% NH4-N, and 22% PO4-P removals were obtained at a DCP concentration of 123 mg/L. The sludge volume index (SVI) changed in a range of 59 to 93 mL/g for DCP concentrations below 123 mg/L, which increased to 142 mL/g at a DCP level of 240 mg/L.