Oily water treatment method and oily water treatment system

Abstract

The invention discloses an oily water treatment method. The oily water treatment method comprises the following treatment links: step 1, primary sedimentation treatment; step 2, homogenization treatment and preliminary three-phase centrifugal separation treatment so as to realize separation nof oil sludge, crude oil and oily water; step 3, secondary sedimentation treatment; step 4, primary dosingtreatment and desliming treatment so as to separate oil sludge from floccules flocculated by dosing flocculation; step 5, secondary three-phase hydrocyclone separation treatment, wherein light oil andsewage are separated through a hydrocyclone separation technology; step 6, secondary dosing treatment and air floatation separation treatment again so as to allow sewage, residual solid sludge and floccules to be separated; step 7, adsorption and filtration treatment: removing heavy metal molecules and suspended particles in the sewage; and step 8, discharging or recycling. The oily water treatment method can purify oily water with high oil sludge content and is good and thorough in purification treatment, national sewage discharge standards in China can be met, standards for oilfield reinjection water can also be met, and purified water can be recycled.

Description

technical field [0001] The invention relates to the technical field of oily sewage treatment, and more specifically, to an oily sewage treatment method and an oily sewage treatment system. Background technique [0002] Oily sewage mainly comes from petroleum, petrochemical, steel, coking, gas generation stations, mechanical processing and other industrial sectors. If the oily sewage does not meet the discharge standards stipulated by the state, if it is discharged into rivers, lakes or bays, it will pollute the water body and affect the survival of aquatic organisms; if it is used for agricultural irrigation, it will block the soil gap and hinder the growth of crops. At present, oily sewage treatment methods are generally aimed at the treatment of oily sewage with less oily sludge, and oil separation, flotation, and biochemical treatment processes are often used. Although the flotation process is easy to operate and can remove most of the suspended oil in oily sewage, it do...

AI Technical Summary

Problems solved by technology

Although the flotation process is easy to operate and can remove most of the suspended oil in oily sewage, it does not achieve ideal results for the removal of dispersed oil, dissolved oil, and emulsified oil

In biochemical treatment, the treated oily sewage can meet the specified discharge indicators, but the equipment needed is expensive, energy consumption is high, the treatment cycle is long, and a lot of resources are consumed

In addition, in the treatment of oily sewage with a large amount of sludge, sedimentation is used to settle part of the sludge first, and then the treatment process is carried out according to the above-mentioned treatment process with less sludge content. The treatment effect needs to be improved, and the disposal standard index is unstable and often fails to reach The emission standards stipulated by the state are difficult to popularize and apply in practice, let alone meet the oilfield reinjection water standards

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