Air flotation-magnetic separation treatment system of oil-containing wastewater

A technology of magnetic separation and magnetic separation device, applied in flotation water/sewage treatment, magnetic field/electric field water/sewage treatment, liquid separation, etc. Remarkable oil removal effect, high oil removal rate and small footprint

Inactive Publication Date: 2015-05-27
袁根福
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Problems solved by technology

At present, the removal of slick oil mainly adopts gravity separation method, and the commonly used equipment is grease trap; the removal of dispersed oil usually adopts filtration method or air flotation method; the removal methods of emulsified oil mainly include air flotation method, flocculation method, electrochemical method, Coarse granulati

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specific Embodiment

[0009] Specific embodiments: the treatment system of the present invention adds a magnetic separation device after the traditional air flotation process, mixes a small amount of flocculant, magnetic particles and oily wastewater, uses magnetic particles as a carrier, and makes the oil adsorb on the magnetic particles, and then passes through The magnetic separation device separates the magnetic substance and its adsorbed oil from the water, so as to achieve the purpose of oil-water separation, and has the advantages of high efficiency, energy saving, land saving, and high recycling rate of magnetic species.

[0010] Its composition includes sequentially connected flocculation air flotation tanks, magnetic separation devices and filtration devices. During the air flotation process, the flocculant PAC is added to the wastewater, and the addition amount is 45-55mg / L for air flotation separation. During the air flotation process, the air flotation The flotation stirring speed is 20...

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Abstract

The invention provides an air flotation-magnetic separation treatment system of oil-containing wastewater and belongs to the field of oilfield wastewater treatment. For solving the problems of the existing treatment methods, namely insufficient treatment effect, or requirement on much equipment and complex treatment steps, an oilfield wastewater treatment system short in treatment process, short in time, small in floor area and high in treatment effect is provided. The system comprises a flocculation air-flotation tank, a magnetic separation device and a filter device, which are orderly connected with each other; in the air flotation process, the dosage of a flocculant PA is 45-55mg/L; in the magnetic separation process, the dosage of PAC is 20-25mg/L; the magnetic seed is Fe3O4 and the dosage of the magnetic seed is 100mg/L; under the condition that the magnetic field intensity is 40mT, the wastewater is firstly stirred for 2 minutes at a rotating speed of 150r/min and then stirred for 5 minutes at a rotating speed of 50r/min, and then the treated wastewater is fed into the filter device for filtration. The treatment system is short in treatment time, small in floor area and stable in treatment effect.

Description

technical field [0001] The invention belongs to the field of oil field wastewater treatment. Background technique [0002] In recent years, Sinopec has actively promoted the work of "water conservation and emission reduction", and has achieved remarkable results. Among them, the reuse of wastewater is one of the important ways to promote the work of "water saving and emission reduction". The oil content of petrochemical wastewater is relatively high, and the oil in wastewater exists in the form of slick oil, dispersed oil, emulsified oil and dissolved oil. At present, the removal of slick oil mainly adopts gravity separation method, and the commonly used equipment is grease trap; the removal of dispersed oil usually adopts filtration method or air flotation method; the removal methods of emulsified oil mainly include air flotation method, flocculation method, electrochemical method, Coarse granulation method and membrane separation method; the removal methods of dissolved ...

Claims

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Application Information

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IPC IPC(8): C02F1/24C02F1/52C02F1/48C02F1/40
Inventor 袁根福
Owner 袁根福
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