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Recent Applications of the Electrocoagulation Process on Agro-Based Industrial Wastewater: A Review. SUSTAINABILITY 2022. [DOI: 10.3390/su14041985] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
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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Process Optimization of Electrochemical Treatment of COD and Total Nitrogen Containing Wastewater. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2022; 19:ijerph19020850. [PMID: 35055672 PMCID: PMC8776051 DOI: 10.3390/ijerph19020850] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2021] [Revised: 12/12/2021] [Accepted: 12/13/2021] [Indexed: 02/04/2023]
Abstract
In this work, an electrochemical method for chemical oxygen demand (COD) and total nitrogen (TN, including ammonia, nitrate, and nitrite) removal from wastewater using a divided electrolysis cell was developed, and its process optimization was investigated. This process could effectively relieve the common issue of NO3-/NO2- over-reduction or NH4+ over-oxidation by combining cathodic NO3-/NO2- reduction with anodic COD/NH4+ oxidation. The activity and selectivity performances toward pollutant removal of the electrode materials were investigated by electrochemical measurements and constant potential electrolysis, suggesting that Ti electrode exhibited the best NO3-/NO2- reduction and N2 production efficiencies. In-situ Fourier transform infrared spectroscopy was used to study the in-situ electrochemical information of pollutants conversion on electrode surfaces and propose their reaction pathways. The effects of main operating parameters (i.e., initial pH value, Cl- concentration, and current density) on the removal efficiencies of COD and TN were studied. Under optimal conditions, COD and TN removal efficiencies from simulated wastewater reached 92.7% and 82.0%, respectively. Additionally, reaction kinetics were investigated to describe the COD and TN removal. Results indicated that COD removal followed pseudo-first-order model; meanwhile, TN removal followed zero-order kinetics with a presence of NH4+ and then followed pseudo-first-order kinetics when NH4+ was completely removed. For actual pharmaceutical wastewater treatment, 79.1% COD and 87.0% TN were removed after 120 min electrolysis; and no NH4+ or NO2- was detected.
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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.
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Muniz GL, Borges AC, da Silva TCF, Batista RO, de Castro SR. Chemically enhanced primary treatment of dairy wastewater using chitosan obtained from shrimp wastes: optimization using a Doehlert matrix design. ENVIRONMENTAL TECHNOLOGY 2022; 43:237-254. [PMID: 32544037 DOI: 10.1080/09593330.2020.1783372] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2020] [Accepted: 06/05/2020] [Indexed: 06/11/2023]
Abstract
Dairy operations generate large volumes of polluted wastewater that require treatment prior to discharge. Chemically enhanced primary treatment (CEPT) is a widely utilized wastewater treatment strategy; but it requires the use of non-biodegradable coagulants that can lead to toxic-byproducts. In this study, chitin from shrimp shell waste is extracted and converted into chitosan. Chitosan was demonstrated to be a natural, low-cost alternative coagulant compatible with the CEPT. Following treatment, dissolved air flotation allowed for the removal of turbidity, COD, and UV254 from the synthetic dairy effluent (SDE). Doehlert matrix was used to optimize the chitosan dosage and pH of the CEPT; as well as to model the process. The mechanisms behind the coagulation-flocculation were revealed using zeta potential analysis. FTIR spectroscopy was utilized to confirm the functional groups present on the chitosan. Chitosan with a degree of deacetylation equal to 81% was obtained. A chitosan dose of 73.34 mg/L at pH 5.00 was found to be optimal for the removal of pollutants. Removals of COD, turbidity and UV254 were 77.5%, 97.6%, and 88.8%, respectively. The amount of dry sludge generated to treat 1 m³ of SDE was 0.041 kg. Coagulation-flocculation mechanisms involved in chitosan-mediated treatment of SDE involve the neutralization of electrostatic charges carried on the amine groups present in cationic chitosan at pH 5.00. Doehlert matrix proved to be a useful tool in optimizing parameters throughout the coagulation-flocculation process. Chitosan from shrimp waste is a low-cost, eco-friendly coagulant alternative for the removal pollutants from dairy effluent using the CEPT.
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Affiliation(s)
- Gustavo Lopes Muniz
- College of Agricultural Engineering, Campinas State University, São Paulo, Brazil
| | - Alisson Carraro Borges
- Department of Agricultural Engineering, Federal University of Viçosa, Minas Gerais, Brazil
| | | | - Rafael Oliveira Batista
- Department of Engineering and Environmental Sciences, Federal Rural University of the Semi-Arid., Rio Grande do Norte, Brazil
| | - Simone Ramos de Castro
- Department of Biochemistry and Tissue Biology, Campinas State University, São Paulo, Brazil
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5
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de Sousa E Silva A, Tavares Ferreira TJ, Sales Morais NW, Lopes Pereira E, Bezerra Dos Santos A. S/X ratio impacts the profile and kinetics of carboxylic acids production from the acidogenic fermentation of dairy wastewater. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 287:117605. [PMID: 34171726 DOI: 10.1016/j.envpol.2021.117605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 04/20/2021] [Accepted: 05/17/2021] [Indexed: 06/13/2023]
Abstract
The acidogenic fermentation of dairy wastewater (DW) was evaluated for carboxylic acids (CA) production, investigating the influence of substrate/microorganism (S/X) ratio and applying different mathematical models to the bioproduct formation data. The experiments were performed in batch reactors for 28 days, and four S/X ratios were tested (0.8, 1.2, 1.6, and 1.9 gCOD gVSS-1). The S/X ratio increase did not influence the percentage of DW conversion into carboxylic acids (42-44%), but the productivity was positively affected (100-200% in general). Acetic acid was the CA formed in the highest concentration for all experiments, followed by propionic and butyric acids. Exponential models were better suited to describe this kinetics process. Therefore, according to the estimated kinetic parameters, the S/X ratio 1.6 was more suitable for CA production from acidogenic fermentation of dairy wastewater, in which the concentrations of longer CA, such as propionate and butyrate, were formed in higher quantities. In addition, it was determined a correlation between the S/X ratio and kinetic parameters like degradation/production rate constant (K) and maximum productivity rate (μm).
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Affiliation(s)
- Amanda de Sousa E Silva
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | | | - Naassom Wagner Sales Morais
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - Erlon Lopes Pereira
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil
| | - André Bezerra Dos Santos
- Department of Hydraulic and Environmental Engineering, Federal University of Ceará, Fortaleza, Ceará, Brazil.
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6
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Arenas CB, González R, González J, Cara J, Papaharalabos G, Gómez X, Martínez EJ. Assessment of electrooxidation as pre- and post-treatments for improving anaerobic digestion and stabilisation of waste activated sludge. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 288:112365. [PMID: 33765574 DOI: 10.1016/j.jenvman.2021.112365] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2020] [Revised: 07/24/2020] [Accepted: 03/11/2021] [Indexed: 05/16/2023]
Abstract
This study evaluates the effects of electro-oxidation as a means for enhancing sludge stabilisation. Boron-doped diamond electrodes were used to treat waste activated sludge and digestate under different operating parameters (current density, conductivity, pH, and time). Electro-oxidation runs affected the solubilisation of organic matter, which seemed to improve anaerobic digestion and dewaterability characteristics. Among the tested parameters, pre-treating sludge via electro-oxidation under alkaline conditions (Treatment T5) resulted in the highest increase in soluble organic material compared to that in the control, with total organic carbon (TOC) and soluble chemical oxygen demand (COD) values of 2753 and 7819 mg L-1, respectively (control TOC and COD values were 385 and 1073 mg L-1). This pretreatment also achieved a high hydrolysis rate (higher concentration in volatile fatty acids) with a concomitant increase in methane yield (approximately 18%). On the other hand, the application of electro-oxidation as a post-treatment for improving digestate dewaterability resulted in noticeable changes in the release of water during drying due to protein and aliphatic matrix modification of the sample.
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Affiliation(s)
- Cristian B Arenas
- Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Av. de Portugal 41, 24009, León, Spain
| | - Ruben González
- Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Av. de Portugal 41, 24009, León, Spain
| | - Judith González
- Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Av. de Portugal 41, 24009, León, Spain
| | - Jorge Cara
- Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Av. de Portugal 41, 24009, León, Spain
| | - George Papaharalabos
- Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Av. de Portugal 41, 24009, León, Spain
| | - Xiomar Gómez
- Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Av. de Portugal 41, 24009, León, Spain
| | - E Judith Martínez
- Chemical and Environmental Bioprocess Engineering Group, Natural Resources Institute (IRENA), University of León, Av. de Portugal 41, 24009, León, Spain.
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7
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Benekos AK, Tsigara M, Zacharakis S, Triantaphyllidou IE, Tekerlekopoulou AG, Katsaounis A, Vayenas DV. Combined electrocoagulation and electrochemical oxidation treatment for groundwater denitrification. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2021; 285:112068. [PMID: 33581453 DOI: 10.1016/j.jenvman.2021.112068] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 01/21/2021] [Accepted: 01/26/2021] [Indexed: 06/12/2023]
Abstract
Electrocoagulation (EC) with an aluminum electrode arrangement as anode-cathode was applied to denitrify groundwater and electrooxidation (EO) was examined as a post-treatment step to remove the produced by-products. Initially, EC experiments were performed under batch operating mode using artificially-polluted tap water to investigate the effects of initial pH (5.5, 7.5, 8.5), initial NO3--N concentration (25, 35, 45, 55 mg L-1) and applied current density (10, 20 mA cm-2) on process efficiency. The effect of initial solution pH on ammonium cation concentration was also investigated as their generation (as a by-product) is the main drawback preventing wide-scale application of these treatment processes. Experimental results revealed high nitrate removal percentages (up to 96.3%) for initial pH 7.5 and all initial concentrations and current densities, while the final ammonium concentrations ranged between 5.3 and 9.2 mg NH4+-N L-1 (for initial NO3--N of 25 mg L-1). Therefore, EO was examined to oxidize the ammonium cations to nitrogen gas on iridium oxide coated titanium electrodes (IrO2/Ti) anode surface. The effects of cathode material (aluminum, stainless steel), total current density and anode surface area (3.3-30 mA cm-2 and 12-36 cm2, respectively) were investigated, and lead to NH4+-N percentage removals of between 25% (10 mA cm-2, 12 cm2) and 100% (30 mA cm-2, 24 cm2) for an initial NH4+-N concentration of 10 mg L-1. The optimum EC (20 mA cm-2, natural initial pH 7.5-7.8) and EO parameters (30 mA cm-2, 24 cm2 surface area anode, Al cathode) were combined into a hybrid system to treat two real nitrate-polluted groundwaters with initial NO3--N concentrations of 25 and 75 mg L-1. Results revealed that the proposed hybrid treatment system can be used to efficiently remove nitrate from groundwaters.
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Affiliation(s)
- Andreas K Benekos
- Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece
| | - Maria Tsigara
- Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece
| | - Stergios Zacharakis
- Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece
| | | | | | - Alexandros Katsaounis
- Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece
| | - Dimitris V Vayenas
- Department of Chemical Engineering, University of Patras, Rio, GR-26504, Patras, Greece; Institute of Chemical Engineering Sciences (ICE-HT), Stadiou Str., Platani, GR-26504, Patras, Greece.
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8
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Lei Y, Zhan Z, Saakes M, van der Weijden RD, Buisman CJN. Electrochemical Recovery of Phosphorus from Acidic Cheese Wastewater: Feasibility, Quality of Products, and Comparison with Chemical Precipitation. ACS ES&T WATER 2021; 1:1002-1013. [PMID: 33889867 PMCID: PMC8054673 DOI: 10.1021/acsestwater.0c00263] [Citation(s) in RCA: 24] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/20/2020] [Revised: 02/18/2021] [Accepted: 02/18/2021] [Indexed: 05/09/2023]
Abstract
The recovery of phosphorus (P) from high-strength acidic waste streams with high salinity and organic loads is challenging. Here, we addressed this challenge with a recently developed electrochemical approach and compared it with the chemical precipitation method via NaOH dosing. The electrochemical process recovers nearly 90% of P (∼820 mg/L) from cheese wastewater in 48 h at 300 mA with an energy consumption of 64.7 kWh/kg of P. With chemical precipitation, >86% of P was removed by NaOH dosing with a normalized cost of 1.34-1.80 euros/kg of P. The increase in wastewater pH caused by NaOH dosing triggered the formation of calcium phosphate sludge instead of condensed solids. However, by electrochemical precipitation, the formed calcium phosphate is attached to the electrode, allowing the subsequent collection of solids from the electrode after treatment. The collected solids are characterized as amorphous calcium phosphate (ACP) at 200 mA or a precipitation pH of ≥9. Otherwise, they are a mixture of ACP and hydroxyapatite. The products have sufficient P content (≤14%), of which up to 85% was released within 30 min in 2% citric acid and a tiny amount of heavy metals compared to phosphate rocks. This study paves the way for applying electrochemical removal and recovery of phosphorus from acidic P-rich wastewater and offers a sustainable substitute for mined phosphorus.
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Affiliation(s)
- Yang Lei
- Wetsus,
Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900CC Leeuwarden, The Netherlands
- Department
of Environmental Technology, Wageningen
University and Research, P.O. Box 17, 6700AA Wageningen, The Netherlands
- School
of Environmental Science and Engineering, Southern University of Science and Technology (SUSTech), Shenzhen 518055, China
| | - Zhengshuo Zhan
- Wetsus,
Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900CC Leeuwarden, The Netherlands
- Department
of Environmental Technology, Wageningen
University and Research, P.O. Box 17, 6700AA Wageningen, The Netherlands
| | - Michel Saakes
- Wetsus,
Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900CC Leeuwarden, The Netherlands
| | - Renata D. van der Weijden
- Wetsus,
Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900CC Leeuwarden, The Netherlands
- Department
of Environmental Technology, Wageningen
University and Research, P.O. Box 17, 6700AA Wageningen, The Netherlands
| | - Cees J. N. Buisman
- Wetsus,
Centre of Excellence for Sustainable Water Technology, P.O. Box 1113, 8900CC Leeuwarden, The Netherlands
- Department
of Environmental Technology, Wageningen
University and Research, P.O. Box 17, 6700AA Wageningen, The Netherlands
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9
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Electrochemical Oxidation of Effluents from Food Processing Industries: A Short Review and a Case-Study. WATER 2020. [DOI: 10.3390/w12123546] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
A short review on the treatment of effluents from food processing industries by electrochemical oxidation (EO) was performed. Olive mill wastewater (OMW) and boron-doped diamond (BDD) are the most reported effluent and anode material, respectively. The addition of NaCl or Na2SO4 as supporting electrolytes is common in these studies, and their influence on the EO performance depends, among other things, on the anode material, since the electrolyte oxidation mechanism is different when active and non-active anode materials are utilized. A case-study on the application of a pilot plant, working in batch mode with recirculation, equipped with a BDD anode, to treat 4 L of OMW, slaughterhouse (SW) and winery (WW) wastewaters, with initial chemical oxygen demands (COD) of 20.5, 3.6 and 0.26 g L−1, respectively, is presented and discussed. In 16 h assays, 94% COD removal was achieved for OMW, and for SW and WW the Portuguese COD legal discharge limit of 150 mg L−1 was accomplished. Process efficiency decreased for lower organic load. NaCl addition increased COD removal in SW and WW, but presented an adverse effect for OMW COD removal, when compared to Na2SO4 addition. Nevertheless, lower specific energy consumptions were attained in chloride medium (48 Wh (g COD)−1).
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10
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Nurhayati E, Bagastyo AY, Hartatik DD, Direstiyani LC. The enhancement of biodegradability index of mature landfill leachate by electrochemical oxidation process using boron-doped diamond and dimensionally stable anode. RESEARCH ON CHEMICAL INTERMEDIATES 2020. [DOI: 10.1007/s11164-020-04242-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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11
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Zhi D, Zhang J, Wang J, Luo L, Zhou Y, Zhou Y. Electrochemical treatments of coking wastewater and coal gasification wastewater with Ti/Ti 4O 7 and Ti/RuO 2-IrO 2 anodes. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 265:110571. [PMID: 32421562 DOI: 10.1016/j.jenvman.2020.110571] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Revised: 03/02/2020] [Accepted: 04/04/2020] [Indexed: 06/11/2023]
Abstract
Electrochemical treatments of coking wastewater (CW) and coal gasification wastewater (CGW) were conducted with Ti/Ti4O7 and Ti/RuO2-IrO2 anodes. The performances of Ti/Ti4O7 and Ti/RuO2-IrO2 anodes were investigated by analyzing the effects of five key influencing factors including anodes material, current density, anode-cathode distance, initial pH value, and electrolyte type. The removal efficiencies of total organic carbon (TOC) were analyzed during the processes of CW and CGW electro-oxidation. The removal efficiencies of sixteen polynuclear aromatic hydrocarbons (PAHs) in CW and CGW by electro-oxidation were also explored to further assess the electrochemical activities of Ti/Ti4O7 and Ti/RuO2-IrO2 anodes. The Ti/Ti4O7 anode achieved 78.7% COD removal efficiency of CW, 85.8% COD removal efficiency of CGW, 50.3% TOC removal efficiency of CW, and 54.8% TOC removal efficiency of CGW, higher than the Ti/RuO2-IrO2 anode (76.7%, 78.1%, 44.8% and 46.8%). The COD removal efficiencies increased with the applied current density, decreased with the increase of the anode-cathode distance, and slightly decreased with the increase of the initial pH value. Meanwhile, the removal efficiencies of sixteen PAHs by the Ti/Ti4O7 anode were mostly higher than those by the Ti/RuO2-IrO2 anode. By comprehensively analyzing the performances of Ti/Ti4O7 and Ti/RuO2-IrO2 anodes on electrochemical treatments of CW and CGW, this study may supply insights into the application potentials of these anodes to the electrochemical treatments of real wastewater.
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Affiliation(s)
- Dan Zhi
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China
| | - Jia Zhang
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China
| | - Jianbing Wang
- School of Chemical and Environmental Engineering, Beijing Campus, China University of Mining and Technology, Beijing, 100083, PR China
| | - Lin Luo
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China.
| | - Yuzhou Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China
| | - Yaoyu Zhou
- College of Resources and Environment, Hunan Agricultural University, Changsha, 410128, PR China.
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12
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Tan X, Zhao Y, Sun W, Jin C, Chen L, Wei H, Sun C. Three-dimensional hierarchically porous PbO2 electrode for electrochemical degradation of m-cresol. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2019.113726] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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13
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Ahmadpour N, Sayadi MH, Homaeigohar S. A hierarchical Ca/TiO2/NH2-MIL-125 nanocomposite photocatalyst for solar visible light induced photodegradation of organic dye pollutants in water. RSC Adv 2020; 10:29808-29820. [PMID: 35518266 PMCID: PMC9056284 DOI: 10.1039/d0ra05192f] [Citation(s) in RCA: 30] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2020] [Accepted: 07/27/2020] [Indexed: 01/10/2023] Open
Abstract
In this study, for the first time, the Ca/TiO2/NH2-MIL-125 nanocomposite photocatalyst was synthesized for the purpose of photodegradation of Methyl Orange (MO) and Rhodamine B (RhB) dyes under visible light irradiation. The structural and chemical properties of the nanocomposite photocatalyst were characterized through FTIR, XRD, TGA, PL, XPS, ICP-OES and UV-DRS. For the photodegradation efficiency analysis, the effect of pH (3, 5, 7, 9, and 11), photocatalyst dosage (0.1, 0.2, 0.4, 0.6, and 0.8 g L−1), dye concentration (1–40 mg L−1), and contact time (10–120 min) was precisely evaluated. The largest photodegradation efficiency for RhB and MO dye models was 82.87% and 86.22%, respectively, that was obtained under optimal conditions in terms of pH and photocatalyst dosage and for Ca(30%)/TiO2/NH2-MIL-125. The photodegradation process of the dyes complied well with the first-order kinetic model. Moreover, the nanocomposite photocatalyst showed consistent photodegradation efficiency and after 6 successive cycles with fresh dye solutions, it could still perform comparably well. Taken together, Ca/TiO2/NH2-MIL-125 photocatalyst is able to show a high photodegradation efficiency for dye pollutants and optimum stability and reusability. In this study, for the first time, the Ca/TiO2/NH2-MIL-125 nanocomposite photocatalyst was synthesized for the purpose of photodegradation of Methyl Orange (MO) and Rhodamine B (RhB) dyes under visible light irradiation.![]()
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Affiliation(s)
- Najmeh Ahmadpour
- Department of Environmental Engineering
- Faculty of Natural Resources and Environment
- University of Birjand
- Birjand
- Iran
| | - Mohammad Hossein Sayadi
- Department of Environmental Engineering
- Faculty of Natural Resources and Environment
- University of Birjand
- Birjand
- Iran
| | - Shahin Homaeigohar
- School of Science & Engineering
- University of Dundee
- Dundee
- UK
- Nanochemistry and Nanoengineering
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14
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Vialkova EI, Sidorenko OV, Glushchenko ES. Qualitative composition and local pretreatment of dairy wastewaters. ACTA ACUST UNITED AC 2019. [DOI: 10.1088/1757-899x/687/6/066049] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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15
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S-rGO/ZnS nanocomposite-mediated photocatalytic pretreatment of dairy wastewater to enhance aerobic digestion. KOREAN J CHEM ENG 2019. [DOI: 10.1007/s11814-019-0319-6] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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16
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Zhang M, Shi Q, Song X, Wang H, Bian Z. Recent electrochemical methods in electrochemical degradation of halogenated organics: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2019; 26:10457-10486. [PMID: 30798495 DOI: 10.1007/s11356-019-04533-3] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/11/2018] [Accepted: 02/07/2019] [Indexed: 06/09/2023]
Abstract
Halogenated organics are widely used in modern industry, agriculture, and medicine, and their large-scale emissions have led to soil and water pollution. Electrochemical methods are attractive and promising techniques for wastewater treatment and have been developed for degradation of halogenated organic pollutants under mild conditions. Electrochemical techniques are classified according to main reaction pathways: (i) electrochemical reduction, in which cleavage of C-X (X = F, Cl, Br, I) bonds to release halide ions and produce non-halogenated and non-toxic organics and (ii) electrochemical oxidation, in which halogenated organics are degraded by electrogenerated oxidants. The electrode material is crucial to the degradation efficiency of an electrochemical process. Much research has therefore been devoted to developing appropriate electrode materials for practical applications. This paper reviews recent developments in electrode materials for electrochemical degradation of halogenated organics. And at the end of this paper, the characteristics of new combination methods, such as photocatalysis, nanofiltration, and the use of biochemical method, are discussed.
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Affiliation(s)
- Meng Zhang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China
| | - Qin Shi
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China
- School of Chemistry and Chemical Engineering, Guangxi University for Nationalities, Nanning, 530008, People's Republic of China
| | - Xiaozhe Song
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China
| | - Hui Wang
- College of Environmental Science and Engineering, Beijing Forestry University, Beijing, 100083, People's Republic of China.
| | - Zhaoyong Bian
- College of Water Sciences, Beijing Normal University, Beijing, 100875, Beijing, People's Republic of China.
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Ghazouani M, Akrout H, Jellali S, Bousselmi L. Comparative study of electrochemical hybrid systems for the treatment of real wastewaters from agri-food activities. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 647:1651-1664. [PMID: 30180367 DOI: 10.1016/j.scitotenv.2018.08.023] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Revised: 08/02/2018] [Accepted: 08/02/2018] [Indexed: 06/08/2023]
Abstract
Agri-food wastewaters are characterized by high contents of hardly biodegradable organics and large amounts of inorganics especially nitrogen and phosphorus. The present work investigates the efficiency of two electrochemical treatment processes, namely electrochemical oxidation/reduction (EOR), electrocoagulation (EC) and their combination for the treatment of two types of effluents collected from poultry slaughterhouse (SHWW) and dairy (DWW) industries. The optimization of these treatment systems in terms of pollutant performance removal and energy cost were carried out. The EOR treatment was assessed on a bipolar cell with Boron-Doped Diamond (BDD) supported on silicon electrodes. While, the EC treatment was performed on a reactor containing mild steel electrodes with parallel configuration. The simultaneous removal efficiencies of the organic matter in term of the chemical oxygen demand (COD), nitrates, ammonium/ammonia and phosphates, as well as the electric energy consumption (EEC), were evaluated for the different electrochemical scenarios. Results indicated that the EOR treatment shows the highest removal efficiencies of COD, nitrates and ammonia from the two studied wastewaters. While, the phosphates were removed only by the EC process. On the other hand, the EC process shows a relatively low cost in term of EEC (0.01 kWh/g COD-1), which is about 13 times lower than the one consumed during the EOR process. The combination of the two processes leads to the improvement of the removal rate of all coexistent pollutants when the EC technology was used as a pre-treatment step. While, this coupling mode has the highest EEC. However, when the EOR process was used before the EC one, the removal rates of COD and nitrates were globally similar to the EOR process alone with a relatively low EEC.
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Affiliation(s)
- Mouna Ghazouani
- Laboratory of Wastewaters and Environment, Centre of Water Researches and Technologies (CERTE), Technopark Borj Cedria, Touristic road of Soliman, BP 273, 8020, Tunisia
| | - Hanene Akrout
- Laboratory of Wastewaters and Environment, Centre of Water Researches and Technologies (CERTE), Technopark Borj Cedria, Touristic road of Soliman, BP 273, 8020, Tunisia.
| | - Salah Jellali
- Laboratory of Wastewaters and Environment, Centre of Water Researches and Technologies (CERTE), Technopark Borj Cedria, Touristic road of Soliman, BP 273, 8020, Tunisia.
| | - Latifa Bousselmi
- Laboratory of Wastewaters and Environment, Centre of Water Researches and Technologies (CERTE), Technopark Borj Cedria, Touristic road of Soliman, BP 273, 8020, Tunisia.
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Tirado L, Gökkuş Ö, Brillas E, Sirés I. Treatment of cheese whey wastewater by combined electrochemical processes. J APPL ELECTROCHEM 2018. [DOI: 10.1007/s10800-018-1218-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Espinoza LC, Henríquez A, Contreras D, Salazar R. Evidence for the production of hydroxyl radicals at boron-doped diamond electrodes with different sp 3 /sp 2 ratios and its relationship with the anodic oxidation of aniline. Electrochem commun 2018. [DOI: 10.1016/j.elecom.2018.03.007] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
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