Abstract

MAYTA, Roddy  and  MAYTA, Jhony. Removal of chromium and chemical oxygen demand of tannery wastewater by electrocoagulation. Rev. Soc. Quím. Perú [online]. 2017, vol.83, n.3, pp.331-340. ISSN 1810-634X.

Removal of trivalent chromium and chemical oxygen demand (DQO) of tannery wastewater samples by electrocoagulation (EC) from discontinuous operation electrochemical reactor were studied. The influence of times (15 to 45 min), voltages (5 to 10 V), dilutions (0 to 2) and their interactions in EC process were significant (p <0.05). Increases in pH, temperature, and decreases of conductivity of the samples during the EC process were observed. The maximum removal of trivalent chromium (~98 %) and DQO (~48 %) was obtained with the treatment (45 min, 10 V and dilution of 2). Likewise, the experimental results allowed to develop mathematical models for the removal of trivalent chromium and DQO, respectively.

Keywords : Electrocoagulation; trivalent chromium; chemical demand oxygen.

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