A comparative optimization and performance analysis of four different electrocoagulation-flotation processes for humic acid removal from aqueous solutions

Hasani, Gona; Maleki, Afshin; Daraei, Hiua; Ghanbari, Reza; Safari, Mahdi; McKay, Gordon; Yetilmezsoy, Kaan; İlhan, Fatih; Marzban, Nader

doi:10.1016/j.psep.2018.10.025

Cited by 43 publications

(15 citation statements)

References 55 publications

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“…When treatment time and current density increase, there are also higher production rates of metal ions and their hydroxide flocs as well as gas bubbles. Consequently, the concentration of pollutants decreases faster [20,[72][73][74]. The optimal treatment time and current density needed for efficient removal can be considered as 14.10 mA/cm 2 and 40 min, respectively.…”

Section: Simultaneous Efficacy Of Critical Parameters On the Removal mentioning

confidence: 99%

The treatment of printing and packaging wastewater by electrocoagulation– flotation: the simultaneous efficacy of critical parameters and economics

Emamjomeh¹,

Kakavand²,

Jamali³

et al. 2020

Desalination and Water Treatment

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In this work, electrocoagulation-flotation (ECF) following sedimentation was applied as a printing and packaging wastewater treatment using four Al electrodes with a parallel monopolar configuration. A sedimentation process was applied after the ECF as a post-treatment phase to remove large pollutants. The simultaneous efficacy of the operating parameters initial color content (1,843.44-12,156.56 ADMI), initial pH (3.56-10.44), current density (6.02-22.18 mA/cm 2), and treatment time (5.62-74.38 min) on color and chemical oxygen demand (COD) removal efficiencies were evaluated alongside processing costs. Response surface methodology (RSM) and central composite design (CCD) optimized these key parameters to achieve the highest removal efficiencies and lowest operating costs. Based on the results analyzed by RSM-CCD, using initial color content of 5,576.38 ADMI, initial pH of 7.29, the current density of 18.49 mA/cm 2 , and treatment time of 59.76 min as optimum operational conditions can result in 97.8% and 92.1% for color and COD removal efficiencies, respectively. At these optimum conditions, operating costs (OPCs), including electrodes material and energy consumption, were 0.07 US$/(kg color removed) and 0.4 US$/(kg COD removed). The results confirm ECF-sedimentation as a promising and costeffective tool for the treatment of printing and packaging wastewater.

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Section: Simultaneous Efficacy Of Critical Parameters On the Removal mentioning

confidence: 99%

The treatment of printing and packaging wastewater by electrocoagulation– flotation: the simultaneous efficacy of critical parameters and economics

Emamjomeh¹,

Kakavand²,

Jamali³

et al. 2020

Desalination and Water Treatment

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“…Several methods like the coagulation process [8], membrane technology [9], adsorption processes [10], and advanced oxidation processes (AOPs) have been employed to remove HSs from the aqueous solution. In AOPs, the hydroxyl radical of OH• as the strongest oxidizing agent is generated, which can degrade both organic and inorganic matters [11].…”

Section: Introductionmentioning

confidence: 99%

Evaluation of Sonocatalytic and Photocatalytic Processes Efficiency for Degradation of Humic Compounds Using Synthesized Transition-Metal-Doped ZnO Nanoparticles in Aqueous Solution

Maleki

Seifi

Marzban

2021

Journal of Chemistry

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The existence of a humic substance in water causes the growth of microorganisms and reduces the quality of water; therefore, the removal of these materials is crucial. Here, the ZnO nanoparticles doped using transition metals, copper (Cu) and manganese (Mn), were used as an effective catalyst for photocatalytic removal of humic substances in an aqueous environment under ultraviolet, visible light, and light-emitting diode irradiations. Also, we study the effect of the sonocatalytic method. A solvothermal procedure is used for doping, and the Cu- and Mn-doped ZnO nanocatalyst were characterized by means of FTIR, XRD, AFM, SEM, and EDAX analyses. We investigate the effect of operational variables, including doping ratio, initial pH, catalyst dose, initial HS content, and illuminance on the removal efficiency of the processes. The findings of the analyses used for the characterization of the nanoparticles illustrate the appropriate synthesis of the Cu- and Mn-doped ZnO nanocatalysts. We observe the highest removal efficiency rate under acidic conditions and the process efficiency decreased with increasing solution pH, when we tested it in the range of 3–7. Photocatalytic decomposition of HS increases with a rise in catalyst dose, but an increase in initial HS content results in decreasing the removal efficiency. We observe the highest photocatalytic degradation of humic acid while using the visible light, and the highest removal efficiency is obtained using Cu.ZnO. The Cu.ZnO also shows better performance under ultraviolet irradiation compared to other agents.

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“…Characteristics of greywater significantly vary depending on many factors such as point of generation, community demographics, human habits, level of occupation, culture and geographical zone (Eriksson et al 2002;Hasani et al 2019). Moreover, detergents, cosmetics and other chemical products could also contribute to the variation of the quality of greywater and its pollutant content (Eriksson et al 2003; Barzegar et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Impact of Storage Time on Characteristics of Synthetic Greywater for Two Different Pollutant Strengths to Be Treated or Recycled

Abed

Almuktar

Scholz

2020

Water Air Soil Pollut

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Storage of greywater is controversial for environmental and health reasons. Artificial greywater was assessed after 2 and 7 days of storage time. Two different greywater pollutant strengths were statistically compared at each storage time. A negative significant (p < 0.05) correlation was evident with increasing storage time for the 5-day biochemical oxygen demand for more than 2 days. However, the concentrations of 5-day biochemical oxygen and chemical oxygen demands reduced significantly at 2 days of storage when compared with freshly prepared greywater. Biodegradability (5-day biochemical oxygen demand/chemical oxygen demand ratio) decreased significantly after storage to between 0.14 and 0.39. The nitrification process was improved significantly with increasing storage time concerning low strength greywater with a significant increase in the removal of ammonianitrogen and a non-significant decrease in the removal of nitrate-nitrogen. The correlation was significantly positive between ammonia-nitrogen and 5-day biochemical oxygen demand for stored greywater, while it was significantly negative between total suspended solids and both 5-day biochemical oxygen demand and dissolved oxygen. Significant reductions in colour, total suspended solids and turbidity were correlated positively with storage time. Precipitation of dissolved metals was suspected to occur in storing greywater by binding the inorganic components with the sediment and collide surfaces through adsorption, allowing a significant drop in concentrations of dissolved and undissolved metals with increasing storage time through sedimentation. Synthetic greywater of low mineral pollution had significantly higher removals for almost all concentrations compared with those for high concentrations. More advanced technologies for high trace element removal are required.

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A comparative optimization and performance analysis of four different electrocoagulation-flotation processes for humic acid removal from aqueous solutions

Cited by 43 publications

References 55 publications

The treatment of printing and packaging wastewater by electrocoagulation– flotation: the simultaneous efficacy of critical parameters and economics

The treatment of printing and packaging wastewater by electrocoagulation– flotation: the simultaneous efficacy of critical parameters and economics

Evaluation of Sonocatalytic and Photocatalytic Processes Efficiency for Degradation of Humic Compounds Using Synthesized Transition-Metal-Doped ZnO Nanoparticles in Aqueous Solution

Impact of Storage Time on Characteristics of Synthetic Greywater for Two Different Pollutant Strengths to Be Treated or Recycled

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