Optimization of saline wastewater treatment using electrochemical oxidation process: Prediction by RSM method

MethodsX, Journal Year: 2019, Volume and Issue: 6, P. 1101 - 1113

Published: Jan. 1, 2019

Response surface methodology (RSM) was applied to find the optimum parameters for COD and TOC removal from saline wastewaters using electrochemical oxidation process. The independent variables considered were reaction time, pH, salt concentration, voltage. Optimization of performed by analysis variance (ANOVA). Quadratic regression equation suggested as a model prediction chemical oxygen demand (COD) total organic carbon (TOC) efficiency. results indicated that efficiencies at optimal conditions pH 7.69, time 30.71 min, content 30. 94 g/L voltage 7.41 V 91.78% 68.49%, respectively. In terms efficiency, coefficients determination found be 0.95 0.94, This study suggests electro-oxidation is an effective process in decreasing wastewaters. Further, RSM suitable technique optimization involved through •The findings demonstrate response good tool experimental data.•A quadratic prediction.•The proved agreement between data predicted equation.

Language: Английский

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Taguchi Method and Response Surface Methodology in the Treatment of Highly Contaminated Tannery Wastewater Using Commercial Potassium Ferrate

Materials, Journal Year: 2019, Volume and Issue: 12(22), P. 3784 - 3784

Published: Nov. 18, 2019

The potential implementation of Envifer®, a commercial product containing potassium ferrate (40.1% K2FeO4), for the purification highly contaminated tannery wastewater from leather dyeing processes was proposed. employment Taguchi method optimization experiments allowed discoloration (98.4%), chemical oxygen demand (77.2%), total organic carbon (75.7%), and suspended solids (96.9%) values to be lowered using 1.200 g/L K2FeO4 at pH 3 within 9 min. application central composite design (CCD) response surface methodology (RSM) with use 1.400 4.5 diminished discoloration, demand, carbon, is suitable initial implementation, while RSM superior extended treatment processes.

Language: Английский

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Chromium removal and water recycling from electroplating wastewater through direct osmosis: Modeling and optimization by response surface methodology

Environmental Health Engineering and Management, Journal Year: 2019, Volume and Issue: 6(2), P. 113 - 120

Published: May 19, 2019

Background: Considering the carcinogenic effects of heavy metals, such as chromium, it is essential to remove these elements from water and wastewater. Direct osmosis a new membrane technology, which can be proper alternative conventional chromium removal processes. Methods: The wastewater samples were collected an electroplating unit, located in Alborz industrial city, Qazvin, Iran. Magnesium chloride was used draw solution, semipermeable (Aquaporin) this study. experiments designed, using response surface methodology (RSM) central composite design (CCD) with solution concentration (0.5- 1.5 M), feed (4-12 mg/L), experiment time (30-90 minutes) variable factors. flux also measured, based on atomic absorption spectrophotometry equation, respectively. Results: highly efficient recycling. Water efficiency 15.6 LMH 85.58%, respectively, under optimal conditions (draw = 1.27 mol/L, 4 mg/L, 90 min). In terms validity, results predicted by quadratic polynomial model good agreement responses reported laboratory. Conclusion: direct osmosis, use magnesium resulted acceptable Using method, reduced level lower than discharge standards, established Iran’s Department Environment.

Language: Английский

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Electrocoagulation Process as a Consolidated Technology in the Treatment of Industrial Effluents and as a Promising Process in the Treatment of Effluents Generated by Car Washes: A Brief Review

ACS ES&T Water, Journal Year: 2024, Volume and Issue: 4(5), P. 1978 - 2004

Published: April 29, 2024

Electrocoagulation (EC) is an efficient treatment method that involves the electrodissolution of anodes, formation coagulants in situ, and production hydrogen at cathode, facilitating removal pollutants by flotation. Industry general aims to reduce contaminant load, expressed as chemical oxygen demand (COD), EC effluent particularly effective this process. The development processes has been alternative for effluents with high pollutant loads, such tannery, pulp paper, textile, beverage, food industries, many demonstrate potential application car wash effluent. This study presents a review use various containing COD, OGs, surfactants, color, turbidity, but greater focus on vehicle washing sector. It also discusses factors influence efficiency main discussions authors. Presently, investigations studies already carried out show performance process dependent relationships factors, type material constituting electrode, electric difference, current density, distance between electrodes, surface area pH, initial concentration contaminants, conductivity time. demonstrated employed types relatively rates, general, 60.0% up 90.0%, aiming reduction COD indexes, from 99.0% color content, 87.0% chromium. In turn, it varied average 44.0 99.0%. For other parameters MBAS most studies, exceeded 90.0%.

Language: Английский

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Synthetic Textile Wastewater Treatment using Potassium Ferrate(VI) – Application of Taguchi Method for Optimisation of Experiment

Fibres and Textiles in Eastern Europe, Journal Year: 2018, Volume and Issue: 26(3(129)), P. 104 - 109

Published: June 30, 2018

The article attempts to assess the usefulness of Taguchi method optimise purification process synthetic textile wastewater (pH 6.7 - 7.2, Conductivity = 6.71 6.84 mS/cm, Salinity 3581 3648 mg NaCl/l, Colour 560 4710 Pt/l, COD 2220 2290 O2/l, TOC 394 551 mg/l) using K2FeO4. research was conducted 3 types containing anionic detergent (sodium lauryl sulfate, 100 and differing only in concentration azo dye Acid Green 16 (AG 16). Technical K2FeO4 used as an oxidiser, which subjected physico-chemical analysis (purity, UV-VIS spectrum, surface characteristics chemical composition SEM EDX methods). For planning optimising treatment process, for four input parameters: pH (2, 7, 12), reaction time (10, 30, 50 min), AG concentrations (20, 120, 220 (25, 125, 225 mg/l), 9 experiments were performed accordance with plan adopted. Test result allowed indicate optimal values individual parameters 2, min, 20 mg/l, 125 mg/l). Under these conditions, visual discoloration obtained 0.4 ↓98% ), colour removal (66 ↓88%) DOC (249 ↓37%).

Language: Английский

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Influence of Elevated Temperature and Pressure on Treatment of Landfill Leachate by Potassium Ferrate(VI)

Water Air & Soil Pollution, Journal Year: 2021, Volume and Issue: 232(11)

Published: Oct. 26, 2021

Abstract The significant problem is the treatment of landfill leachate characterized by high chemical oxygen demand (COD) and total organic carbon (TOC) presence biodegradation inhibitors such as heavy metals oily substances. For case (pH 7.9, color 1550 mg Pt/L, COD 1880 O 2 /L, TOC 620 mg/L, nitrogen (TN) 220 phosphorus (TP) 6 mg/L metals), effect elevated pressure temperature on decrease value potassium ferrate(VI) (K FeO 4 ) was investigated. Taguchi method (TM) employed for optimizing process parameters (repetition, pH, K concentration, time, temperature, pressure). Maximizing criterion function signal-to-noise (S/N), optimal were determined: pH 3.5, 2.0 g/L, time 45 min, 30 °C, 1 MPa. At conditions, a color, COD, TOC, TP above 91%. Additionally, TN 48.2%. Comparatively, at atmospheric (0.1013 MPa) 19 TP, 99.9%, 83.0%, 79.0%, 19.1%, 100%, respectively. Addition may improve compound removal decreases energy consumption in subcritical water oxidation. Graphical abstract

Language: Английский

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Effectiveness of electrocoagulation and chemical coagulation methods on paper industry wastewaters and optimum operating parameters

Separation Science and Technology, Journal Year: 2020, Volume and Issue: 56(12), P. 2074 - 2086

Published: Aug. 11, 2020

Electrocoagulation and chemical coagulation are treatment methods based on the same removal mechanism.In this study, it was investigated effectiveness of using Al electrodes Al2(SO4)3.18H2O wastewaters from cardboard production.In electrocoagulation experiments, optimum current pH where highest COD efficiency by 54% achieved were determined respectively as 10A 6.62.The study also seen that 58%COD reached for KCl concentration 0.5 mg/L applied.In efficiencies obtained 36%, 95% 97% COD, color turbidity.The results show higher could be a pre-treatment step.

Language: Английский

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Optimizing functions of coagulants in treatment of wastewater from metalworking fluids: Prediction by RSM method

Environmental Health Engineering and Management, Journal Year: 2018, Volume and Issue: 5(1), P. 15 - 21

Published: Jan. 10, 2018

Optimizing functions of coagulants in treatment wastewater from metalworking fluids: Prediction by RSM method

Language: Английский

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Treatment of Real Textile Wastewater by Using Potassium Ferrate(VI) and Fe(III)/H2O2. Application of Aliivibrio Fischeri and Brachionus plicatilis Tests for Toxicity Assessment

Fibres and Textiles in Eastern Europe, Journal Year: 2019, Volume and Issue: 27(3(135)), P. 78 - 84

Published: April 24, 2019

The paper presents the possibility of applying combined chemical oxidation processes using potassium ferrate(VI) (K2FeO4) and Fe(III)/H2O2 for treatment real wastewater from textile industry characterised by an increased content organic substances (COD = 1920 mg O2/L). use both under optimal conditions included RSM method (Response Surface Methodology) in order to make it possible decrease COD 75.4% (final 472 toxicity treated most favourable conditions, determined two test organisms (Aliivibrio fischeri Brachionus plicatilis), decreased 33 45%, respectively. In some cases described can be used on a larger scale.

Language: Английский

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Optimization of Electrocoagulation-Flocculation for Chlorella Vulgaris Biomass Recovery Using Response Surface Methodology

E3S Web of Conferences, Journal Year: 2024, Volume and Issue: 559, P. 04032 - 04032

Published: Jan. 1, 2024

The issue of how to economically harvest and recover algal biomass has always been concern green wastewater treatment systems utilizing microalgal technology. This study explores the efficiency recovery from Chlorella Vulgaris using an electrocoagulation-flocculation method, aiming optimize environmentally friendly harvesting biomass. Utilizing a response surface methodology (RSM) with central composite design (CCD), research investigates impact pH, current intensity, reaction time, salinity on efficiency. Optimal conditions were identified as pH 6.5, intensity 1.5A, time 20 minutes, 15ppt, achieving optimal 84.36%. findings underscore significant influence where deviations optimum value substantially reduced confirms that electrocoagulation is viable effective method for enhancing recovery, offering sustainable alternative traditional chemical flocculation methods by reducing dependency coagulants minimizing production costs. results provide solid scientific basis future enhancements in industrial application algae, promoting environmental protection economic viability.

Language: Английский

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