Experimental studies on pretreatment process of brackish water using electrocoagulation (EC) method

Wang, Sanfan; Wang, Qinlai

doi:10.1016/0011-9164(87)90217-7

Cited by 13 publications

(7 citation statements)

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“…According to the existing process of the beneficiation plant, sequential addition of regulator, collector, and frother to the flotation cell were carried out, as shown in Figure 2. After flotation, the products were dried, weighed, and assayed, and then the recovery was calculated on the basis of the mass and metal balance, as shown in Equation (7).…”

Section: Flotation Experimentsmentioning

confidence: 99%

“…It is worth noting that coagulation-flocculation, the most common technique in beneficiation plants because of its economy, usually has a relative low COD removal rate of only 35% [3]. Electrocoagulation (EC) has become widely used as a wastewater treatment technology in the past decade and has exhibited a satisfactory removal of COD in diverse fields, such as in textiles [4], the food industry [5], dairying [6], brackish water [7], and potable water [8]. Its advantages include easy operation, small area occupation, and a high degree of automation.…”

Section: Introductionmentioning

confidence: 99%

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Electrocoagulation: A Promising Method to Treat and Reuse Mineral Processing Wastewater with High COD

Jing

Ren

Gao

et al. 2020

Water

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Mineral processing wastewater contains large amounts of reagents which can lead to severe environmental problems, such as high chemical oxygen demand (COD). Inspired by the wastewater treatment in such industries as those of textiles, food, and petrochemistry, in the present work, electrocoagulation (EC) is applied for the first time to explore its feasibility in the treatment of wastewater with an initial COD of 424.29 mg/L from a Pb/Zn sulfide mineral flotation plant and its effect on water reuse. Typical parameters, such as anode materials, current density, initial pH, and additives, were characterized to evaluate the performance of the EC method. The results showed that, under optimal conditions, i.e., iron anode, pH 7.1, electrolysis time 70 min, 19.23 mA/cm2 current density, and 4.1 g/L activated carbon, the initial COD can be reduced to 72.9 mg/L, corresponding to a removal rate of 82.8%. In addition, compared with the untreated wastewater, EC-treated wastewater was found to benefit the recovery of galena and sphalerite, with galena recovery increasing from 25.01% to 36.06% and sphalerite recovery increasing from 59.99% to 65.33%. This study confirmed that EC is a promising method for the treatment and reuse of high-COD-containing wastewater in the mining industry, and it possesses great potential for wide industrial applications.

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Section: Flotation Experimentsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Electrocoagulation: A Promising Method to Treat and Reuse Mineral Processing Wastewater with High COD

Jing

Ren

Gao

et al. 2020

Water

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“…Within experimental error, the concentrations of the sodium and potassium species did not show any notable reduction. Wang and Wang [28] used electrocoagulation for pre-treatment of brackish water and also reported that sodium and potassium ions were not removed to any notable extent. Removal of sodium and potassium ions from the coal seam water sample was not expected due to the difficulty in provision of a mechanism for this to occur, as for example, precipitation was highly unlikely.…”

Section: Physical Parametersmentioning

confidence: 99%

“…Significant control of the COD content was observed, albeit problems were encountered in terms of metal ion removal and this was attributed to a lack of "green rust" formation when using mild steel electrodes. Sanfan and Qinlai [28] reported a mechanistic investigation of brackish water purification using electrocoagulation and considered current density to be the most important factor. Koparal [29] demonstrated the applicability of electrocoagulation in conjunction with conventional water treatment methods such as precipitation, adsorption, filtration and electrodialysis for removal of salinity from produced water.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of electrocoagulation for the pre-treatment of coal seam water

Millar

Lin

Arshad

et al. 2014

Journal of Water Process Engineering

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“…9 Além da formação do agente coagulante, a EF pode gerar microbolhas de gases (3) que são responsáveis pela flotação de óleos, graxas e outros compostos particulados. [26][27][28] …”

Section: Introductionunclassified

Avaliação do processo eletrolítico em corrente alternada no tratamento de água de produção

Cerqueira

Marques

2011

Quím. Nova

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objective was to study the treatment of wastewater generated by the oil industry. This work consisted of tests of electroflocculation with alternate current (AC), and chemical coagulation. The removal efficiencies of organic load were evaluated by the removal of oils and greases, color and turbidity. The parameters investigated were the change in alternate current frequency, the initial pH, the distance between electrodes, the applied potential and time lapse. From the results, one may conclude that the electroflocculation process is potential applicability to the effluent studied, while chemical coagulation was not successful.Keywords: electroflocculation; offshore platforms; water production. INTRODUÇÃOAs atividades de exploração de petróleo, devido à crescente preocupação com o meio ambiente e ao surgimento de novas leis e resoluções ambientais mais restritivas, precisam se enquadrar dentro das novas exigências. Uma das questões mais preocupantes envolve a água de produção gerada nessa atividade, a qual aumenta gradativamente em volume à medida que os poços vão envelhecendo e que novos poços são perfurados. 1 Normalmente, essa água corresponde a mais de 90% de todos os efluentes gerados na indústria do petróleo: em média, para cada m³/dia de petróleo produzido são gerados de 3 a 4 m³/dia de água, podendo chegar a 7 ou mais, nas atividades de exploração, perfuração e produção. Para que a água produzida possa ser descartada em corpos receptores ou utilizada na reinjeção em poços de petróleo, é necessário o seu tratamento prévio para enquadrá-la na legislação vigente. A Resolução CONAMA 357/2005, 4 estabelece que para o descarte em corpos receptores, o limite de óleos e graxas na água produzida é de até 20 mg/dm 3 . Especificamente, para descarte em plataformas off-shore, aplica-se a Resolução CONAMA 393/2007, 5 que estabelece a média aritmética simples mensal do teor de óleos e graxas de até 29 mg/dm 3 , com valor máximo diário de 42 mg/dm 3 . Para reinjeção em poços de petróleo, a água deverá ter no máximo 5 mg/dm 3 de óleos e graxas.Uma parte do óleo presente na água de produção está na forma de emulsão devido às partículas sólidas finamente divididas oriundas da perfuração, assim como os produtos químicos residuais utilizados na desestabilização de emulsões óleo/água (O/A) e as moléculas surfactantes naturais do petróleo. 6 Neste caso, o diâmetro das gotas situa-se abaixo de 50 μm, o que dificulta a sua separação por meios gravitacionais. A separação do óleo emulsificado requer a desestabilização da emulsão O/A, a qual é governada por quatro diferentes fenômenos: coagulação, floculação, sedimentação (creaming) e coalescência. 7 O creaming é o deslocamento gravitacional das gotas para a superfí-cie da fase contínua em função da diferença de densidade entre as duas fases, não necessariamente após a coagulação e/ou floculação das gotas.A colisão entre as gotas pode levar à coalescência com a formação de grandes agregados até se tornar novamente uma fase contínua separada do meio dispersante por uma simples inte...

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Experimental studies on pretreatment process of brackish water using electrocoagulation (EC) method

Cited by 13 publications

References 0 publications

Electrocoagulation: A Promising Method to Treat and Reuse Mineral Processing Wastewater with High COD

Electrocoagulation: A Promising Method to Treat and Reuse Mineral Processing Wastewater with High COD

Evaluation of electrocoagulation for the pre-treatment of coal seam water

Avaliação do processo eletrolítico em corrente alternada no tratamento de água de produção

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