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Phosphorus and COD removal from chemically and electrochemically coagulated wastewater

Smoczyński L., Muńska K. T., Kosobucka M., Pierożyński B.

Environment Protection Engineering

2014

Vol. 40, nr 3

63--73

Wastewater coagulation and electrocoagulation were investigated as sorption processes involving colloidal sorbents such as (Al(OH)3)n, (Fe(OH)3)m and (Fe(OH)2)p. An attempt was made to fit experimental data to two popular sorption models. Based on a statistical and mathematical analysis of the obtained results, the Langmuir model of chemical adsorption was regarded more probable than the Freundlich model. The highest maximum adsorption of phosphorus in the analyzed wastewater was achieved with the use of PIX, and the lowest adsorption maxima were reported for an iron electrocoagulant. PAC was most effective in reducing COD of wastewater. PAC and PIX delivered higher adsorption maxima for compounds responsible for COD than aluminum and iron electrocoagulants.

Simultaneous decolorization of ternary dye mixture from aqueous solution by electrocoagulation

Keskin C. S., Özdemir A., Karabayir E., Şengil I. A.

Environment Protection Engineering

2013

Vol. 39, nr 3

119--133

The current study focused on the treatment of a ternary mixture of dyes which includes Disperse Blue 56 (DB56), Basic Yellow 28 (BY28) and Acid Violet 90 (AV90) using the electrocoagulation (EC) process with iron electrodes. In the presence of all dye molecules, the optimum pH was found to be 6, optimum NaCl concentration was 3000 mg/dm3 and optimum current density was 8.66 mA/cm2. Under the optimized conditions in the case of 100 mg/dm 3 each dye concentration, the average colour removal efficiency was reached 93%. Dye concentration dependent highest COD removal efficiency was measured as 88.70% at 150 mg/dm3 dye concentration.