Combined Coagulation and Electrochemical Process t

Authors: José M Aquino Gabriel F Pereira Romeu C RochaFilho Nerilso Bocchi Sonia R Biaggio

Publish Date: 2016/07/14

Volume: 227, Issue: 8, Pages: 266-

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Abstract

Combined coagulation and electrochemical treatment processes were used to mineralize the organic load and detoxify a real textile effluent The coagulation step was investigated for distinct pH values 4 to 11 and Al2SO43 concentrations 025 to 900 g L−1 Complete turbidity and partial total organic carbon TOC removals were attained at pH 5 using 050 g L−1Al2SO43 Moreover the coagulation process totally removed the initial toxicity 100  mortality of the effluent assessed by toxicity tests with the crustacean Artemia salina The remaining TOC was mineralized by the electrochemical step in a flow cell with a borondoped diamond BDD anode when the investigated parameters were the BDD borondoping level 100 500 2500 ppm pH 3 7 11 no control and current density 10 20 30 mA cm−2 No significant differences in TOC removal were observed when the BDD anode or pH value was changed however as the system was under mass transport limitation mineralization attained at low current densities led to a reasonable current efficiency ∼40  and low energy consumption ∼16 kW h m−3 The use of the electrochemical method solely led to poor TOC and turbidity removals thus not being recommendedWe gratefully acknowledge financial support and scholarships from the Brazilian funding agencies São Paulo Research Foundation FAPESP grant no 2012/135877 CNPq and CAPES Professors Antonio Aparecido Mozeto and Pedro Sérgio Fadini are gratefully acknowledged for granting access to different apparatuses Professor Edério Dino Bidóia and his master’s student José Rubens Moraes Júnior from the Universidade Estadual Paulista at Rio Claro SP are also gratefully acknowledged for helping with the A salina toxicity test

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