Treatment of oily wastewater from mining industry using electrocoagulation: Fundamentals and process optimization

Merma, Antonio Gutiérrez; Santos, Brunno F.; Rego, Artur S. C.; Hacha, Ronald Rojas; Torem, Maurício Leonardo

doi:10.1016/j.jmrt.2020.10.107

Cited by 45 publications

(19 citation statements)

References 65 publications

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“…A relatively higher removal efficiency of HA was observed at pH 5. This is also consistent with the results of previous studies (Merma et al 2020). This phenomenon can be explained by the formation of a gel layer on the surface of the aluminum anode under high pH and high HA concentration.…”

Section: Ha Removalsupporting

confidence: 93%

Optimum parameters for humic acid removal and power production by Al–air fuel cell electrocoagulation in synthetic wastewater

Wei

Gong

Sheng

et al. 2021

Water Science and Technology

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Although humic acid (HA) is a complex natural organic matter, it can potentially harm the environment and human health. In this study, aluminum–air fuel cell electrocoagulation (AAFCEC) was used to remove HAs from water while generating electricity. Initial pH, electrolyte concentration, HA concentration electrode distance and external resistance were investigated to determine the power generation and removal efficiency. The results showed that the better performance of power generation has been acquired in the alkaline solution and larger electrolyte concentration and short electrode distance. Further, Al–Ferron complexation timed spectrophotometry was used to determine the Al speciation distribution in the solution under different parameters. The power density of the cell reached 313.47 mW/cm2 for the following conditions: 1 g/L NaCl concentration, 3 cm electrode distance, 20 Ω external resistor, and pH 9. After about an hour electrolysis, the optimum removal rate of HA was above 99%. The results demonstrated that the AAFCEC is an efficient and eco-friendly water treatment process, and it could be further developed and disseminated in the rural areas and households.

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Section: Ha Removalsupporting

confidence: 93%

Optimum parameters for humic acid removal and power production by Al–air fuel cell electrocoagulation in synthetic wastewater

Wei

Gong

Sheng

et al. 2021

Water Science and Technology

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“…As a result, it is not easy to produce enough OHions for metal hydroxide production in an acidic condition. In line with this finding, Merma et al (2020) explained that the stable component of aluminum at a pH lower than 5 is Al 3+ . It means that the Al(OH)3 as the coagulant at EC treatment is difficult to be generated.…”

Section: The Effect Of Phsupporting

confidence: 54%

“…Other researchers also reported that pH has an influence on the EC process performance, such as in the copper removal (Kim et al 2014;Yılmaz et al 2008) and removal of Cu, Ni, and Mn (Al-Aji et al 2012). According to Merma et al (2020), Al(OH)3 is precipitated at the pH range of 5 and 9.5, while at pH higher than 9.5, [Al(OH)4] − is the major species. Therefore, it is suggested that the decrease in the efficiency of Cu and Pb ions removal at pH 11 is due to the dissociation of metal hydroxides and the generation of [Al(OH)4] − species which is a soluble species.…”

Section: The Effect Of Phmentioning

confidence: 99%

Copper and Lead Ions Removal by Electrocoagulation: Process Performance and Implications for Energy Consumption

Prasetyaningrum

Ariyanti

Widayat

et al. 2021

Int. J. Renew. Energy Dev.

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Electroplating wastewater contains high amount of heavy metals that can cause serious problems to humans and the environment. Therefore, it is necessary to remove heavy metals from electroplating wastewater. The aim of this research was to examine the electrocoagulation (EC) process for removing the copper (Cu) and lead (Pb) ions from wastewater using aluminum electrodes. It also analyzes the removal efficiency and energy requirement rate of the EC method for heavy metals removal from wastewater. Regarding this matter, the operational parameters of the EC process were varied, including time (20−40 min), current density (40−80 A/m2), pH (3−11), and initial concentration of heavy metals. The concentration of heavy metals ions was analyzed using the atomic absorption spectroscopy (AAS) method. The results showed that the concentration of lead and copper ions decreased with the increase in EC time. The current density was observed as a notable parameter. High current density has an effect on increasing energy consumption. On the other hand, the performance of the electrocoagulation process decreased at low pH. The higher initial concentration of heavy metals resulted in higher removal efficiency than the lower concentration. The removal efficiency of copper and lead ions was 89.88% and 98.76%, respectively, at 40 min with electrocoagulation treatment of 80 A/m2 current density and pH 9. At this condition, the speciﬁc amounts of dissolved electrodes were 0.2201 kg/m3, and the energy consumption was 21.6 kWh/m3. The kinetic study showed that the removal of the ions follows the first-order model.

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“…Tiny bubbles of hydrogen and oxygen gas released from the electrodes collide with air bubbles to float the pollutant particles (Chaturvedi 2013). It requires no chemical (except for pH control); tolerate broad range of pollutants and fluctuation in influent quality; reduced residue; fully automated with less operator attention; lower sludge volume and better sludge quality (Kumar et al 2004;Merma et al 2020). However, high capital and energy costs formed crucial barriers to industrial application of EC, despite its high effectiveness and environmental friendliness (Gu et al 2009;Uludag-Demirer et al 2020).…”

Section: Electrocoagulation Treatment Technologymentioning

confidence: 99%

Treatment of industrial oily wastewater by advanced technologies: a review

2021

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Oily wastewater consists of fats, oils and greases together with a broad spectrum of dissolved organic and/or inorganic substances in suspension. It is regarded as one of the most hazardous wastewaters, causing serious environmental and health threats to the ecosystems, flora and fauna. The global increase in the discharge of oily wastewater coupled with stringent regulations for effluent discharge and incessant drive for re-use of treated wastewater necessitate the need for treatment of the wastewater. Conventional approaches employed in the past are inept for oily wastewater treatment due to low treatment efficiency and high operational costs, among others, hence the need for adoption of advanced technologies as promising alternatives to existing treatment systems for oily wastewater. Furthermore, the use of combined treatment processes is effective for the removal of hazardous pollutants present in high-strength oily wastewater. This review provides insights into advanced and emerging state-of-the-art technologies for safe and efficient treatment of industrial oily wastewater.

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Treatment of oily wastewater from mining industry using electrocoagulation: Fundamentals and process optimization

Cited by 45 publications

References 65 publications

Optimum parameters for humic acid removal and power production by Al–air fuel cell electrocoagulation in synthetic wastewater

Optimum parameters for humic acid removal and power production by Al–air fuel cell electrocoagulation in synthetic wastewater

Copper and Lead Ions Removal by Electrocoagulation: Process Performance and Implications for Energy Consumption

Treatment of industrial oily wastewater by advanced technologies: a review

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