Soil aquifer treatment of artificial wastewater under saturated conditions

H. M K Essandoh, Chedly Tizaoui, Mostafa H A Mohamed, Gary L. Amy, Damir Brdjanovic

Research output: Contribution to journalArticlepeer-review

36 Scopus citations

Abstract

A 2000 mm long saturated laboratory soil column was used to simulate soil aquifer treatment under saturated conditions to assess the removal of chemical and biochemical oxygen demand (COD and BOD), dissolved organic carbon (DOC), nitrogen and phosphate, using high strength artificial wastewater. The removal rates were determined under a combination of constant hydraulic loading rates (HLR) and variable COD concentrations as well as variable HLR under a constant COD. Within the range of COD concentrations considered (42 mg L-1-135 mg L-1) it was found that at fixed hydraulic loading rate, a decrease in the influent concentrations of dissolved organic carbon (DOC), biochemical oxygen demand (BOD), total nitrogen and phosphate improved their removal efficiencies. At the high COD concentrations applied residence times influenced the redox conditions in the soil column. Long residence times were detrimental to the removal process for COD, BOD and DOC as anoxic processes and sulphate reduction played an important role as electron acceptors. It was found that total COD mass loading within the range of 911 mg d-1-1780 mg d-1 applied as low COD wastewater infiltrated coupled with short residence times would provide better effluent quality than the same mass applied as a COD with higher concentration at long residence times. The opposite was true for organic nitrogen where relatively high concentrations coupled with long residence time gave better removal efficiency. © 2011.
Original languageEnglish (US)
Pages (from-to)4211-4226
Number of pages16
JournalWater Research
Volume45
Issue number14
DOIs
StatePublished - Jun 5 2011

ASJC Scopus subject areas

  • Water Science and Technology
  • Pollution
  • Ecological Modeling
  • Waste Management and Disposal

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