Isolation of Iron Bacteria from Washing Sludge Filters Kolda (Senegal) Water Treatment Station and Study of the Kinetics of Biological Degradation of the Iron (II)

Abstract

In the present work, the treatment of synthetic waters doped with iron (II) has been studied. The treatment mechanism used in this study is the biological oxidation which consists, in test tubes, of bringing bacteria isolated on Petri dishes into contact with water containing divalent iron (II). These de-ironing bacteria (non-specific bacteria) are used to carry out laboratory biological oxidation experiments on iron (II) under different pH conditions (pH = 3.4-3.6, pH = 7.3-7.5 and pH = 9.8-10) and variable concentration of iron (II). Biological treatment trials included different concentrations of iron during time intervals of a day. Examination of the elimination kinetics of Iron (II) indicates a removal rate of 59.453% for an initial iron concentration in the synthetic solution of 1 mg•L −1 at basic pH (pH = 9.8-10). Therefore, the degradation of divalent iron by this method seems to be quite effective, but it should be noted that biological nitrification is impaired by the presence of high iron concentrations above 5 mg•L −1 .

Process for the Biological Removal of Fe (II) from Reconstituted Waters on a Support of Filter Material with Coated Jujube Seeds

“…In these experiments, the maximum value of the oxidation rate of Fe (II) was observed at pH 9.5 (Figure 5). This value is close to the value obtained during tests in tubes for the elimination of iron present in water reconstituted by ferrobacteria isolated on a Petri dish (9.8) (Faye et al, 2019). We have tried to reproduce the works of whose optimum pH was 7.3.…”

“…The Fe (II) concentration is calculated by multiplying the obtained concentration by 10. Iron concentrations were evaluated according to the following relationship (Faye et al, 2019):…”

“…To measure the amount of biomass in the three (3) beakers over time, we first determine the maximum wavelength from the release of a small amount of wash sludge in distilled water. The preparation of the solutions to be assayed follows the same protocol for the determination of Fe (II) by ortho-phenanthroline (Faye et al, 2019). Indeed, the principle will be to take the prepared solution and pass the monochromatic light at different wavelength, then build a graph of the absorbance as a function of the wavelength.…”