Removal of oil from biodiesel wastewater by electrocoagulation method

Electrocoagulation treatment of black liquor from soda-AQ pulping of wheat straw

“…After 20 min, increasing current density beyond 15 mA/cm 2 did not show any significant improvement on the percentage of color, COD, and BOD removal. Also, Ahmadi et al (2013) reported that the higher (>10 mA cm −2 ) current density has no significant effect on the removal efficiency of oil and grease. In optimum conditions, COD removal efficiency reached up to 80.1 %.…”

Effect of the Mixed Oleophilic Fibrous Coalescer Geometry and the Operating Conditions on Oily Wastewater Separation

“…In the petrochemical industry, oily wastewater is produced at various stages, such as oil extraction, storage, transportation, petroleum refining, and utilization [1,2]. This wastewater results in serious environmental pollution and resource wasting problems.…”

“…Most kinds of industrial wastewater contain O/W emulsions among their basic contaminants [4]. Various physical methods are used for oil-water separation, such as gravity separation, parallel-plate separation [5], air flotation [6], hydrocyclone separation [7], centrifugal separation [8], filtration [9], micro-and ultrafiltration [10,11], electric field separation [1,12], ultrasonic separation [13,14], and membrane separation [15,16]. These methods can separate free and dispersed oil droplets in wastewater efficiently and economically.…”

“…The fibrous-bed coalescer, which is considered as an effective separation apparatus, has been used as an inexpensive means to separate the secondary emulsion, which has droplet sizes in the range of 1-20 μm [22]. Factors affecting bed coalescence and separation efficiency (E) 1) are the media properties, the operation conditions, and the emulsion properties.…”

Removal of Imidacloprid Pesticide by Electrocoagulation Process using Iron and aluminum Electrodes

“…The EC process has many advantages like simple equipment requirement, easy operation, no chemical use requirement, rapid sedimentation, sludge stability, low sludge production, and environmental compatibility. It has successfully been employed for the treatment of different wastewaters such as from hospitals [12], baker's yeast [13], laundries [14], biodiesel [15,16], and slaughter houses [17], wastewaters including surfactants [18], fluoride [19] and heavy metal-containing solutions [20,21]. Different technological processes such as adsorption [22], biodegradation [23,24], nanofiltration [25], electrocoagulation, electrochemical reduction and oxidation, indirect electro-oxidation with strong oxidants, and photocatalytic degradation [26,27], for the removal of pesticides have been reported recently.…”