Abstract

AGUDELO-VALENCIA, Rafael Nikolay et al. Degradation of sulfide from leather tanning wastewater by hydrodynamic cavitation. Rev. ion [online]. 2019, vol.32, n.1, pp.21-33.  Epub June 03, 2019. ISSN 0120-100X.  https://doi.org/10.18273/revion.v32n1-2019002.

Sulfide present in the wastewater from industrial tanneries is resulting from unhairing (depilated of the skin) in concentrations that affects significantly the water system due to its toxicity, producing the mortality of flora and fauna, responsible for the presence of unpleasant odors in the riverbed and decreasing the dissolve oxygen in the water of the receiver stream. In the present research, removal of sulfide is evaluated using hydrodynamic cavitation (HC). An advanced technology is analyzed by different parameters as initial pH solution and inlet pressure, set in two prototypes established for a reaction time of 90 minutes. Design parameters as number and diameter of holes in the constriction are estimated according on the degradation extent with the objective of knowing best reactor characteristics for wastewater treatment applying this technique. A maximum extent of sulfide oxidation of 32.6% was reached without using any further reagents; cost - benefit analysis had been discussed in the present investigation due to the enhance of cavitation hydrodynamic reached compared with the energy required by the reactor observing a shortfall of 198% related with the conventional treatment, HC was found as a sustainable technology for tannery industries.

Keywords : Advanced Oxidation; Hydrodynamic Cavitation; Liming Wastewater; Sulfur; Tannery..

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