Anodic Oxidation of Industrial Winery Wastewater Using Different Anodes

Abstract

Winery wastewater represents the largest waste stream in the wine industry. This deals with the mineralization of the organic matter present in winery wastewater using anodic oxidation and two types of anodes—namely, a boron-doped diamond electrode (BDD) and two mixed metal oxides (MMO), one with the nominal composition Ti/Ru0.3Ti0.7O2 and the other with Ti/Ir0.45Ta0.55O2. To conduct the study, the variability of different quality parameters for winery wastewater from the Chilean industry was measured during eight months. A composite sample was treated using anodic oxidation without the addition of supporting electrolyte, and the experiments were conducted at the natural pH of the industrial wastewater. The results show that this effluent has a high content of organic matter (up to 3025 ± 19 mg/L of total organic carbon (TOC)), which depends on the time of the year and the level of wine production. With MMO electrodes, TOC decreased by 2.52% on average after 540 min, which may be attributed to the presence of intermediate species that could not be mineralized. However, when using a BDD electrode, 85% mineralization was achieved due to the higher generation of hydroxyl radicals. The electrolyzed sample contained oxamic, acetic, and propionic acid as well as different ions such as sulfate, chloride, nitrate, and phosphate. These ions can contribute to the formation of different species such as active species of chlorine, persulfate, and perphosphate, which can improve the oxidative power of the system.

Study on Facile and Full-Scale Reuse Treatment of Wastewater Produced from Tail Gas Oxidation-Absorption Technology of Natural Gas Purification Plant

“…Water quality measurements were carried out as follows: The pH of the samples was measured with a SevenGo Duo Pro pH meter (Mettler Toledo, Zurich, Switzerland) at 25 • C. The conductivity of samples was quantified using a DDS-307 conductometer (INESA & Scientific Instruments Co., Ltd., Shanghai, China) at 25 • C. Measurements of COD, BOD 5 , TOC, and suspended solid (SS) were carried out on the basis of the APHA Standard Methods [32][33][34]. In addition, a UV7504 UV-Vis spectrophotometer (Shanghai jingmi instrument Co., Ltd., Shanghai, China) was employed to measure ammonia-N and TN.…”

Wastewater Treatment Using Shear Enhanced Flotation Separation Technology: A Pilot Plant Study for Winery Wastewater Processing

“…In relation to percentage composition, it consists of 7.5% grape stems, up to 45% grape pomace, and approximately 6% grape seeds [4]. The liquid component, i.e., winery wastewater, on the other hand, is generated during the cleaning of barrels and tanks, washing of transfer lines and floors, wine extraction, as well as numerous other operations in filtration units and water drains [5].…”

Ecotoxicological Risk Assessment as a Decision Tool for the Valorisation of Winery Wastewater Treatment Byproducts to Agricultural Purposes

“…If properly treated, winery wastewater can be reused for agricultural irrigation (Mosse et al 2012). Winery wastewater treatment studies have already been presented in the specialized literature, such as, coagulation-flocculation (Braz et al 2010;Rizzo et al 2010); coagulation-flocculation-decantation and ozonization process (Jorge et al 2021a) membrane processes (nanofiltration and reverse osmosis) (Ferrarini et al 2001;Ioannou et al 2013a); ozonation (Beltrán et al 1999;Lucas et al 2009aLucas et al , 2009b; combination of ozone and radiation and/or hydrogen peroxide (Lucas et al 2009 a); photo-Fenton (Mosteo et al 2006;Ormad et al 2006); photo-Fenton with solar radiation (Monteagudo et al 2012); wet oxidation (Domínguez et al 2014); anodic oxidation (Lauzurique et al 2022;Candia-Onfray et al 2018), anaerobic digestion (Kaira et al 2022), combination of adsorption and thermocatalytic processes (Jorge et al 2021b) advanced oxidation processes based on sulfate radicals (Amor et al 2019), photocatalytic/ photolytic processes (Agustina et al 2008) and microalgae and immobilized TiO 2 /UV-A LEDs (Marchão et al 2021). However, the application of alkaline precipitants for the treatment of wastewater in wineries still needs to be further studied.…”