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

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 ...

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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 granulation method and membrane separation method; the removal methods of dissolved oil mainly include biological method, adsorption method, membrane separation method, advanced oxidation method, sonic method, ultrasonic method and microwave method, etc., but either the treatment effect is incomplete or equipment is needed Many and complex processing steps