Modeling an industrial dissolved air flotation tank used for separating oil from wastewater

Behin, Jamshid; Bahrami, S. Hajir

doi:10.1016/j.cep.2012.05.004

Cited by 50 publications

(29 citation statements)

References 27 publications

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“…Therefore, adequate treatment of these wastewaters is essential before it is discharged into water bodies. The potential treatment methods for pollutants in the CMW include dissolved air flotation [9], chemical treatment [10], membrane separation [11,12], adsorption [13] and ion exchange [14]. However, most of these treatment methods have some some disadvantages because these methods take considerable operating time, addition of treatment chemicals, require an extensive set-up, generate release of secondary pollutants (chloride, sulphate in the coagulationprecipitation), and generate large volumes of sludge or waste which have to be disposed of.…”

Section: Introductionmentioning

confidence: 99%

Evaluations of operating parameters on treatment of can manufacturing wastewater by electrocoagulation

Kobya

Demirbaş

2015

Journal of Water Process Engineering

106

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Section: Introductionmentioning

confidence: 99%

Evaluations of operating parameters on treatment of can manufacturing wastewater by electrocoagulation

Kobya

Demirbaş

2015

Journal of Water Process Engineering

106

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“…Nowadays, the treatments of the spilled oil and wasteoil are important aspects in environmental governance. The common methods of oil treatment include in situ combustion , chemical condensation , gravitational sedimentation , air flotation , adsorption , and so forth. Due to the advantages of low requirements to the instruments, easy operation, low cost, and so forth, adsorption with special absorbents is an efficient way to separate oil from water.…”

Section: Introductionmentioning

confidence: 99%

Superhydrophobic PCL/PS composite nanofibrous membranes prepared through solution blow spinning with an airbrush for oil adsorption

Yin

et al. 2018

Polymer Engineering & Sci

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Superhydrophobic composite nanofibrous membranes(PP) were prepared from polycaprolactone (PCL)/polystyrene (PS) through solution blow spinning with an airbrush for oil adsorption. PP membranes were characterized by fourier transform infrared spectroscopy, scanning electron microscopy, water contact angle, X‐ray Photoelectron Spectroscopy, X‐ray diffractometer, and thermogravimetric analysis instrument. The effects of mass ratio of PCL and PS on the morphology, porosity, density, cyrstallinity, thermal stability, and oil adsorption ability were investigated. PP membranes had higher density than PCL and PS, while better hydrophobicity. The saturation adsorption capacity of PP to peanut oil, motor oil, and diesel oil is 16.89 g/g, 20.33 g/g, and 12.17 g/g, respectively. After 6 cycles of reutilization, the adsorption capacity to peanut oil, motor oil, and diesel oil remained at 6.16, 7.46, and 5.33 g/g, respectively, higher than that of pure PCL membrane.The water/oil adsorption selectivity of PP was about 7:100. PP had higher oil adsorption capacities and better water/oil adsorption selectivity than the commercial oil absorbent polypropylene. PP membrane could be prepared and used in situ to separate oil from oil/water mixture. POLYM. ENG. SCI., 59:E171–E181, 2019. © 2018 Society of Plastics Engineers

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“…The pre-flocculated mixture passes to a second chamber equipped with a mechanical paddle-type agitator (4) activated by an electric motor. With a satisfactory degree of blending, the water-oil mixture comes into contact with a flow of microbubbles that exit a sparger (5) in a preliminary flotation chamber (6). The mixture of the flocculated influent with microbubbles produces oily foam that floats due to the difference in density in comparison with the water and is gathered in a collector (7) as the foam overflows from the chamber.…”

Section: Daf Prototypementioning

confidence: 99%

“…Like every productive process, the equipment should be automated so that the system can be maintained in a steady state throughout its operation [5]. Considering the need to control the mixture of fluids and maintain the level of the foam-liquid interface in the flotation chamber, the development of strategies to meet such needs should be associated with the enhancement of the separation efficiency in the chamber [6]. It is possible to maintain the level of the liquid in a DAF chamber in accordance with previously established references values using process control systems and the development of controllers [7,8].…”

Section: Introductionmentioning

confidence: 99%

Strategy for Controlling the Level in a Dissolved Air Flotation Chamber

Galdino¹,

Moura²,

Santos³

et al. 2015

JCCE

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The aim of the present study was to implant an efficient strategy for controlling the level of the effluent-oily foam interface in a DAF (dissolved air flotation) chamber of a pilot-scale prototype. DAF has been successfully used in the treatment of oily water, which is one of the main environmental problems in different industrial facilities. Along with important operational parameters, such as microbubble size and flow rate, the control strategy for the automation of a DAF chamber may be an important tool for increasing efficiency. Controlling the level was the strategy chosen to enhance the separation efficiency in a pilot-scale DAF prototype, with monitoring performed using a computational program in LabVIEW (laboratory virtual instrument engineering workbench). The findings demonstrate that it is possible to maintain the level of the fluid at a reference value established by the operator using the software program through the application of classic proportional integral derivative controllers. Using this control tool, the efficiency of water-oil separation in the pilot flotation chamber prototype was increased to nearly 98%.

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Modeling an industrial dissolved air flotation tank used for separating oil from wastewater

Cited by 50 publications

References 27 publications

Evaluations of operating parameters on treatment of can manufacturing wastewater by electrocoagulation

Evaluations of operating parameters on treatment of can manufacturing wastewater by electrocoagulation

Superhydrophobic PCL/PS composite nanofibrous membranes prepared through solution blow spinning with an airbrush for oil adsorption

Strategy for Controlling the Level in a Dissolved Air Flotation Chamber

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