Electrochemical Oxidation of Effluents from Food Processing Industries: A Short Review and a Case-Study

Martínez-Cruz, Alfredo; Fernandes, Annabel; Ciríaco, Lurdes; Carvalho, Fátima; Afonso, Alexandra; Madeira, Luís M.; Luz, Silvana; Lopes, Ana

doi:10.3390/w12123546

Cited by 11 publications

(3 citation statements)

References 48 publications

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“…A COD removal of 22% was attained. Although it is not a remarkable removal, the treatment time was just 1 h. Since the objective was to recover phosphorus, it was not worth extending the treatment time to reach higher COD removal, as this can be performed in a secondary electrochemical treatment, without magnesium consumable anodes [62]. A COD removal of 22% was attained.…”

Section: Effect Of a Real Matrixmentioning

confidence: 99%

Electrochemical Recovery of Phosphorus from Simulated and Real Wastewater: Effect of Investigational Conditions on the Process Efficiency

Sousa,

Fernandes,

Amaro

et al. 2023

Sustainability

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The development of recovery processes has become essential in recent years as a strategy to minimize environmental pollution while boosting circular economy and sustainable development. Due to the exponential growth in agricultural production and the increased pollution of waterbodies, the production of fertilizers from recovered phosphorus has become an alternative to phosphate rock-based production. In this work, the effect of different operational parameters in the efficiency of the electrochemical recovery of phosphorus, from organic and inorganic sources, was investigated. Among the studied variables, the most significant was the electrode material utilized in the system. The use of magnesium sacrificial electrodes, as AZ31 alloys, led to phosphorus removal from solution of above 90%, allowing the recovery of both orthophosphates and organic phosphorus (glyphosate) as struvite, brucite, and other amorphous compounds. Since there is a lack in the literature about the use of magnesium electrodes in real wastewater electrochemical treatment, system efficiency was also evaluated using a sanitary landfill leachate, reaching 96% of phosphorus recovery. The specific energy consumption and faradaic efficiency of the phosphorus recovery process were also assessed.

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Section: Effect Of a Real Matrixmentioning

confidence: 99%

Electrochemical Recovery of Phosphorus from Simulated and Real Wastewater: Effect of Investigational Conditions on the Process Efficiency

Sousa,

Fernandes,

Amaro

et al. 2023

Sustainability

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“…Activated sludges have considerable energy consumption and are poorly tolerant to load and flow variations [5]. In this way, different SWW treatment processes have been investigated, namely chemical (e.g., electrochemical oxidation [6],…”

Section: Fibentech21mentioning

confidence: 99%

Phytoremediation as a Sustainable Alternative for Organic Matter Removal From Slaughterhouse Wastewater Pretreated by Immediate One-Step Lime Precipitation

Madeira¹,

Carvalho²,

Teixeira³

et al. 2022

Kms

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In this study, slaughterhouse wastewater previously treated by immediate one-step lime precipitation was treated using a vertical flow constructed wetland (VFCW). A VFCW pilot scale planted with Vetiveria zizanioides in light expanded clay aggregates was used to study the influence of the organic load applied (3 to 212 g m−2 d−1) and the bed depth of the VFCW (0.35 and 0.70 m) on the organic matter removal (COD). Two VFCWs operated in parallel under continuous flow, and a hydraulic load of around 80 L m−2 d−1 was used. The results indicated that an increase in the organic load decreased COD removal efficiency. The bed depth of the VFCW had a significant influence on the removal of organic matter, with greater removal at high bed depths. For organic loads applied up to 9.5 g m−2 d−1, COD removal efficiencies of 71.4 ± 4.0% and 85.2 ± 3.4% were observed for lower and higher VFCW bed depth, respectively, which met the requirements for water reuse for irrigation. Throughout the tests, Vetiveria zizanioides did not show signs of toxicity, and its growth was substantial. Keywords: slaughterhouse wastewater, vertical flow constructed wetlands, Vetiveria zizanioides, organic matter removal, immediate one-step lime precipitation

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“…(2020) (landfill site located in South Korea, closed in the year 2000 after eight years of operation) obtained COD 0.536 g LÀ1 and pH 8.2; and Poblete et al (2019) (landfill situated in Chile) found COD 12.3 g LÀ1 and pH 8.9. The reason for these notable differences was the variability in the production and composition of leachates in landfills(Deng and Englehardt, 2006;Mandal et al, 2017;Martínez-Cruz et al, 2020).…”

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confidence: 99%

Leachate treatment: comparison of a bio-coagulant (Opuntia ficus mucilage) and conventional coagulants using multi-criteria decision analysis

Martínez-Cruz

Valencia

Araiza-Aguilar

et al. 2021

Heliyon

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The main aim of this research was to compare a bio-coagulant, organic coagulant, and a conventional coagulant applied to the treatment of leachates. Coagulant options were Stage 1 FeCl 3 , Stage 2 Polyamine, and Stage 3 Opuntia ficus mucilage (OFM). Optimal conditions for maximum chemical oxygen demand (COD) removal were determined by experimental data and Response Surface Methodology. The application of Multiple Criteria Decision Analysis using Multi-Criteria Matrix (MCM) was explored by evaluating the Coagulation-Flocculation processes. Maximum COD removal (%) and the best MCM scores (on a scale from 0 to 100) were: Stage 1: 69.2AE0.9 and 48.50, Stage 2: 37.8AE1.1 and 79.0, and Stage 3: 71.1AE1.7, and 81.5. Maximum COD removal using FeCl 3 and OFM was not statistically different (p 0.15 < 0.05). OFM extraction process was evaluated (yield 0.70 AE 1.17%, carbohydrate content 32.6 AE 1.18%). MCM allows the evaluation of additional technical aspects, besides oxygen COD removal, as well as economic aspects, permitting a more comprehensive analysis. Significant COD removals indicate that the use of OFM as a coagulant in the treatment of stabilized leachate was effective. Opuntia ficus cladodes, a residue, were used to treat another residue (leachates).

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Electrochemical Oxidation of Effluents from Food Processing Industries: A Short Review and a Case-Study

Cited by 11 publications

References 48 publications

Electrochemical Recovery of Phosphorus from Simulated and Real Wastewater: Effect of Investigational Conditions on the Process Efficiency

Electrochemical Recovery of Phosphorus from Simulated and Real Wastewater: Effect of Investigational Conditions on the Process Efficiency

Phytoremediation as a Sustainable Alternative for Organic Matter Removal From Slaughterhouse Wastewater Pretreated by Immediate One-Step Lime Precipitation

Leachate treatment: comparison of a bio-coagulant (Opuntia ficus mucilage) and conventional coagulants using multi-criteria decision analysis

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