Treatment of winery wastewater by anodic oxidation using BDD electrode. (September 2018)

• Record Type: Journal Article
• Authors: Candia-Onfray, Christian; Espinoza, Nicole; Sabino da Silva, Evanimek B.; Toledo-Neira, Carla; Espinoza, L. Carolina; Santander, Rocío; García, Verónica; Salazar, Ricardo
• Is Part Of: Chemosphere. Volume 206(2018)
• Page Start: 709
• Page End: 717
• Publication Date: 2018-09
• Subjects: Anodic oxidation -- Winery wastewater -- Boron-doped diamond electrode -- Hydroxyl radical -- Mineralization; Pollution -- Periodicals; Pollution -- Physiological effect -- Periodicals; Environmental sciences -- Periodicals; Atmospheric chemistry -- Periodicals; 551.511
• DOI: 10.1016/j.chemosphere.2018.04.175
• Languages: English
• ISSNs: 0045-6535

Abstract

Abstract: The effective removal of organics from winery wastewater was obtained in real residual effluents from the wine industry using anodic oxidation (AO). The effluent had an initial organic load of [COD]0 of 3490 mg L −1 equal to [TOC]0 of 1320 mg L −1 . In addition, more than 40 organic compounds were identified by means of GC-MS. Different density currents as well as the addition of electrolytes were tested during electrolysis. The results show the decay of [COD]t by 63.6% when no support electrolyte was added, whereas almost total mineralization and disinfection was reached after adding of 50 mM of sodium sulfate and sodium chloride and applying higher density currents. The presence of sulfate and chloride in large concentration favors the production of oxidants such as hydroxyl radicals and active chlorine species that react with organics in solution. Moreover, the addition of a supporting electrolyte to industrial wastewater increases conductivity, reduces cell potential and therefore, decreases the energy consumption of the AO process. Highlights: Total mineralization and disinfection of organics from real winery wastewater by anodic oxidation. Treatment of industrial winery wastewater using BDD/Stainless Steel system. Hydroxyl radicals, active chlorine species and persulfate anion oxidate the organics. Addition of sulfate or chloride increases the mineralization and reduces the costs. A colorless wastewater without organics and solids after 4 h applying 60 mAcm −2 .