Treatment of table olive processing wastewaters using electrocoagulation in laboratory and pilot-scale reactors

Benekos, Andreas K.; Zampeta, Charikleia; Argyriou, Rafailia; Economou, Christina Ν.; Triantaphyllidou, Irene-Eva; Tatoulis, Triantafyllos I.; Tekerlekopoulou, Athanasia G.; Vayenas, D.V.

doi:10.1016/j.psep.2019.08.036

Cited by 31 publications

(13 citation statements)

References 37 publications

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“…After 56 min of treatment, COD removals for 100, 200 and 300 mg.L −1 MO dye solutions were 66.7%, 54.6% and 43.2%, respectively; color removals were 91.1%, 63.2% and 52.6%, respectively and dye removals were 96.6%, 64.7% and 57.6%, respectively; indicating the highest removal efficiency for the lowest dye concentration (100 mg.L −1 ). Additionally, removal efficiencies increased with increasing electrolysis time for 100 mg.L −1 dye solution, whereas higher concentrations (200 and 300 mg.L −1 ) showed limiting removal efficiencies, which were supported by previous studies ( Benekos et al., 2019 ; El-Ashtoukhy et al., 2017 ; Zeboudji et al., 2013 ). Researchers recommended this effect due to the presence of insufficient amounts of flocs and exhaustion of adsorption capability of these limited flocs for higher contaminant concentrations ( Ahmadzadeh et al., 2017 ; An et al., 2017 ; Kabdaşlı et al., 2012 ).…”

Section: Resultssupporting

confidence: 89%

“…In the current study, Fe electrodes were used due to their higher treatment efficiency, longer durability, lower cost and non-toxic nature than Al electrodes ( Ghalwa et al., 2016 ; Ghernaout et al., 2011 ; Moreno et al., 2009 ). Also, Al electrodes eliminate contaminants only by EC mechanism whereas, Fe electrodes remove contaminants by both EC and electro-oxidation (EO) mechanisms ( Benekos et al., 2019 ; Nasrullah et al., 2018 ). The anodic electrochemical reactions of Fe follow two mechanisms and generate Fe(OH) 3 and Fe(OH) 2 ( Table 2 ) ( Ghernaout, 2018 ; Mollah et al., 2001 ; Zodi et al., 2009 ).…”

Section: Introductionmentioning

confidence: 99%

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Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study

Akter

Islam

2022

Heliyon

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Section: Resultssupporting

confidence: 89%

Section: Introductionmentioning

confidence: 99%

Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study

Akter

Islam

2022

Heliyon

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“…The treatment of COD removal also produces biogas, as reported by a previous study. The result shows that the COD removal of OOMW using the electrocoagulation process produces biogas around 0.741 g/L COD [90].…”

Section: Olive Oil Mill Wastewatermentioning

confidence: 98%

Recent Applications of the Electrocoagulation Process on Agro-Based Industrial Wastewater: A Review

et al. 2022

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Agro-based final discharge is one of the major contributors to wastewater in the world. It creates high demand for efficient treatment. The electrocoagulation process can be used for agro-based wastewater treatment. The performance of the electrocoagulation process is based on several parameters, including the electrode materials, electrolysis time, current density, and electrolyte support. Agro-based industrial wastewater (AIW) treatment processes depend on the characteristics of the wastewater. The removal of organic content from various sources of AIW can reach up to more than 80%. Some studies show that the performance of the electrochemical process can be increased using a combination with other methods. Those other methods include biological and physical treatment. The results of previous research show that organic content and color can be degraded completely. The relationship between the energy consumption and operating cost was analyzed in order to show the efficiency of electrocoagulation treatment.

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“…Ozonization [1,2], electrocoagulation [3] and electrochemical treatments [4,5] could, to a large extent, reduce the chemical oxygen demand contamination of the table olive wastewaters. Aerobic and anaerobic treatments alone, or in combination with another technique, have also been researched with promising results for the organic contamination reduction in these [6,7].…”

Section: Introductionmentioning

confidence: 99%

Assessment of the Antimicrobial and Fertilizing Activity of Table Olive Concentrated Waste Streams During Their Shelf Life

Brenes

Santos

Aguado

et al. 2021

Waste Biomass Valor

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Table olive wastewaters represent a big problem for factories not yet solved. Some partial solutions are the purification, the reuse or the generation of a smaller volume of these liquids. The purpose of this study was to investigate the possibility of obtaining a concentrate that can be stable over time and that has a biofertilizing capacity on tomato (Solanum lycopersicum L.) plants. In this study, washing waters from Spanish style green and storage liquids from black ripe olive processing were vacuum concentrated up to 10, 13 and 17 times so that they reached total sugar content of up to 700 mmol L−1, 925 mmol L−1 and 1200 mmol L−1 respectively. Interestingly, the evaporation achieved to retain most of the phenolic compounds that ranged from 18 mmol L−1 in the fresh solution to 140 mmol L−1 in the solution concentrated 10 times. Moreover, these concentrates showed in vitro antimicrobial activity against the bacteria Erwinia amylovora and Pseudomonas syringae, and the Oomycota Phytophthora sp. In addition, they increased the strength and cumulative yield of the tomato plants cultivated under greenhouse conditions, even after 12 months of storage at room temperature. It has been demonstrated that it is possible to reduce the large volume of the wastewaters of the table olive industry, and the concentrates have potential application for agricultural uses, even after 1 year of storage, thereby contributing to a more environmentally sustainable industry. Graphical Abstract

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Treatment of table olive processing wastewaters using electrocoagulation in laboratory and pilot-scale reactors

Cited by 31 publications

References 37 publications

Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study

Effect of additional Fe2+ salt on electrocoagulation process for the degradation of methyl orange dye: An optimization and kinetic study

Recent Applications of the Electrocoagulation Process on Agro-Based Industrial Wastewater: A Review

Assessment of the Antimicrobial and Fertilizing Activity of Table Olive Concentrated Waste Streams During Their Shelf Life

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