The application of electrochemical processes in oily wastewater treatment: a review

Drušković, Morana; Vouk, Dražen; Posavčić, Hana; Halkijević, Ivan; Nađ, Karlo

doi:10.1080/10934529.2021.1999714

Cited by 12 publications

(9 citation statements)

References 61 publications

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“…Although inorganic flocculants are inexpensive and simple to use, they are ineffective at separating particles and require pH modification. [14] Keqian Li and etal studied and explained membrane flux. Membrane fouling was significantly reduced by the use of ozone.…”

Section: Factors Affecting Electrocoagulationmentioning

confidence: 99%

Wastewater Treatment Using Electrocoagulation: Review

2023

IRJMETS

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Due to its versatility, ease of setup, low footprint, and eco-friendliness, electrocoagulation (EC) is a prominent wastewater treatment alternative that has been extensively researched for a wide range of wastewater types. The following hybrid EC processes are currently being researched: EC-adsorption, EC-peroxidation, ECchemical coagulation (CC), photovoltaic EC, and EC-membrane. The hybrid EC-membrane process undisputedly stands out as the future of wastewater treatment due to its overall low carbon footprint requirement, environmental sustainability, and strong potential for continuous operation without the necessity of extensive control. The efficiency of electrocoagulation is affected by current density, anode-cathode gap, electrode arrangement, composition, and shape; initial pollutant concentration; solution composition and pH; and electrolysis time. The dramatic rise in urbanization and industrialization has significantly increased the amount and variety of waste, particularly wastewater, generated. Wastewater contains a wide range of organic and inorganic pollutants. Various wastewater treatment technologies have been developed. It has taken several decades to tackle the increasing concern regarding effective pollutant removal from wastewater. Electrocoagulation (EC) is one such broad-based, highly reliable, and cost-effective technology. Additionally, it boasts a high pollutant extraction efficiency and produces less sludge than other techniques. Despite being used effectively to treat a wide range of wastewater, a thorough examination of its efficiency under various process variables has not been critically analyzed.

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Section: Factors Affecting Electrocoagulationmentioning

confidence: 99%

Wastewater Treatment Using Electrocoagulation: Review

2023

IRJMETS

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“…A more recent approach to treatment involves the use of electrochemical (electrocoagulation, EC) and advanced oxidation processes (electro-Fenton, EF). For each wastewater, it is observed how electrochemical processes alone or in combination with AOP affect its composition and what percentage of pollution can be removed to make the water safe for use or discharge to the environment [3]. Both methods have become the subject of numerous studies because they treat wastewater using electricity instead of chemical reagents and the biological activity of microorganisms, which may be less economical and operationally beneficial in certain circumstances.…”

Section: Electrochemical and Advance Oxidation Processes (Aop)mentioning

confidence: 99%

“…The final step is the cleaning of the water column with flocs floating to the surface. Suspended and dissolved impurities are removed by coagulation with electrochemically generated iron and aluminum cations, co-precipitation with iron and aluminum hydroxides, and precipitation of corresponding metal hydroxides [1,3,37].…”

Section: Electrochemical and Advance Oxidation Processes (Aop)mentioning

confidence: 99%

“…The development of industry leads to an increase in the amount of waste oils, and most of them are generated in petrochemical, metallurgical, mechanical, and marine industries [2]. Oily wastewater is defined as a combination of wastewater and oil in a certain ratio [3]. The wastewater generated by the aforementioned Higher porosity, defined pore distribution, higher flow at lower pressures, better separation efficiency, and good chemical, thermal, and mechanical stability Difficult to handle because they are very fragile and have high manufacturing costs Conventional methods have shown many limitations, so some modern techniques have been developed that have proven effective in removing oil from oily wastewater.…”

Section: Introductionmentioning

confidence: 99%

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The Influence of Pretreatment on the Efficiency of Electrochemical Processes in Oily Wastewater Treatment

Drušković¹,

Vouk

Bolanča

et al. 2022

Water

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Wastewater containing oil is becoming a growing problem worldwide due to increasing quantities and existing pollution. The pollutants contained in these effluents, when released into the environment, affect surface and groundwater pollution, endanger human life and health, and pollute the atmosphere. Their sustainable treatment should be cost-effective and meet all requirements to prevent the pollutants from being transferred to the environment or to humans. This study gives a brief overview of some conventional and modern technologies that have been proven in practice for the treatment of oily wastewater. Due to the high concentrations of chemical oxygen demand (COD) and total hydrocarbons (mineral oils) in oily wastewater its treatment is complex, and to achieve optimum treatment conditions and efficiency a combination of different technologies is required. This paper focuses on hybrid electrochemical process combining the electro-Fenton process (EF) using stainless steel (SS), and electrocoagulation (EC) with iron (Fe) and aluminum (Al) electrodes. The influence of the two different types of pretreatment, i.e., pretreatment of the raw wastewater on the overall efficiency of oily wastewater treatment using a hybrid treatment process, which is a combination of AOP and EC, is investigated. Two type of pretreatment were tested, with primary sedimentation and pretreatment of the mixture of raw wastewater and previously generated electrochemical sludge with primary sedimentation. During the applied treatment processes, the concentration of COD, mineral oils, and other elements in the raw and treated wastewater (As, Ca, Cd, Cr, Cu, Ni, Pb, Sn, Zn) and in the generated sludge (K, Ca, Fe, Ti, V, Cr, Mn, Ni, Cu, Zn, Ga, As, Br, Rb, Sr, Y, Zr, Pb, Th) were determined. By combining the primary sedimentation of the raw wastewater with the EF/EC process, a mineral oil removal efficiency of 72% (1.1 mg/L) and COD of 89% (170 mg/L) was achieved. Using primary sedimentation of a mixture of raw wastewater with previously generated sludge as pretreatment and followed by EF/EC treatment, a higher efficiency for mineral oils of 94% (7.6 mg/L) and COD of 98% (43 mg/L) was achieved.

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“…[1][2][3][4] Treatment of oily wastewater is an imminent global challenge. 5 Some traditional oil-water separation methods have been widely used, including centrifugal separation, 6 gravity separation, 7,8 biodegradation, 9,10 photocatalytic degradation, 11,12 oil slick recovery devices, 13 air flotation, 14 electrochemistry, 15 adsorption separation, 16 etc. Although the aforementioned treatment methods can separate oil-water mixtures to some extent, they are still limited by many objective factors, 5 such as timeconsuming separation, inefficiency, high energy consumption, 16 a complex and large area of equipment, the need for regular maintenance and management, and high working costs.…”

Section: Introductionmentioning

confidence: 99%