African Journal of
Environmental Science and Technology

  • Abbreviation: Afr. J. Environ. Sci. Technol.
  • Language: English
  • ISSN: 1996-0786
  • DOI: 10.5897/AJEST
  • Start Year: 2007
  • Published Articles: 1082

Article in Press

Biological removal of iron from groundwater in a pilot column on a filter support material with coated jujube seeds

FAYE Mamadou, TOURE Alpha Ousmane, NDOYE Mouhamed, SAMBE Falilou Mbacké, DIOP Mar Codou Guèye

  •  Received: 22 April 2022
  •  Accepted: 23 September 2022
A co-flow pilot filter with a packing support material (coated jujube seeds) was constructed and tested for the biological removal of iron from Senegalese groundwater. Indeed, it is a PVC tube with an internal diameter of 40 mm and a height of 90 cm. The performance of the filter was tested at a constant hydraulic head of 261.67 m3/m2 per day while the iron feed concentrations varied between 0.5-1, 0.5-1.5 and 0.5-2 mg/L respectively. Coated jujube seeds, covered with a plastic layer and a biofilm containing microorganisms, were used as the filter material. The iron removal was carried out in a single stage, for which a period of two (2) months was required for the maturation of the bed. In optimal working conditions (QL = 8.11 L/h; pH = 9.5; [Fe2+]0 = 2 mg/L; P = 1.013 bar and T = 25±1° C; Redox potential = 300 mV), an operating cycle time of 1 day has proven to be sufficient for the filter bed backwash operation.. The results show that the biological treatment gives reduction percentages of 39.3%, 48.76% and 67.23% respectively for the boreholes of Pout Kirène (PK2), Pout Sud (PS5) and Koungheul (KK5).

Keywords: Biofilm, Continuous Test, Biological Oxidation, Iron Removal, Column, Doped Water