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Oily sewage reinjection technique without drug feeding treatment

A sewage and process technology, applied in the direction of filtration treatment, special treatment targets, multi-stage water treatment, etc., can solve the problems of heavy burden, etc., and achieve the effect of increasing treatment cost, good degreasing effect, and reducing backwashing cycle

Inactive Publication Date: 2017-12-29
ENMAN TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, when the combination of physical and chemical methods is used to treat oily sewage, a large amount of flocculant, coagulant and other agents are added in the early stage, which will increase the burden on the subsequent filtration process.

Method used

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  • Oily sewage reinjection technique without drug feeding treatment
  • Oily sewage reinjection technique without drug feeding treatment
  • Oily sewage reinjection technique without drug feeding treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0040] Embodiment 1: A kind of reinjection system for treating oily sewage without adding medicine, such as figure 1 and figure 2 As shown, it includes a settling oil removal tank 1 , a cyclone purification device 2 , an air flotation filter device 3 and a sterilization device 4 connected in sequence. The oily sewage enters the settling oil removal tank 1 and is divided into oil slick layer and sewage under the action of gravity. The sewage enters the cyclone purification device 2 for further centrifugation to obtain the oil phase and primary separated water. The primary separated water enters the air flotation filter device 3 for further separation to obtain the secondary separated water and oil phase. The oil phase is discharged, and the secondary separated water enters the sterilizing device 4 for disinfection treatment to obtain reinjection water that can be directly recharged. In addition, an oil collection mechanism 12 is provided in the settling oil removal tank 1, ...

Embodiment 2

[0053] Example 2: A process for reinjection of oily sewage without adding chemicals, using the oily sewage reinjection system in Example 1 to detect oily sewage stations in a certain place, wherein the oil content of the oily sewage is about 1.3kg / L. The oily sewage is injected into the sedimentation oil removal tank 1 to separate layers, and an oil collection mechanism 12 is arranged at the liquid injection port of the sedimentation oil removal tank 1 . After 40 minutes of oil recovery treatment, the oil slick collected from the sedimentation oil removal tank 1 appeared to be separated, and then after 20 minutes of oil recovery treatment, oily sewage was obtained. At this time, the oil content in the oily sewage was about 500 mg / L.

[0054] Oily sewage passes through an aeration demulsification device (not shown in the figure, a conventional coalescing plate demulsification device is used), and under the action of air flow, the oil-water interface in the oily sewage is destr...

Embodiment 3

[0067] Example 3: A reinjection process for treating oily sewage without adding chemicals. The oil content in the oily sewage after oil recovery treatment is about 45 mg / L. The specific results after treatment by this process are shown in Table 3.

[0068] Table 3 Analysis of oil content in influent and effluent of oily sewage

[0069]

[0070]

[0071] To treat oily sewage with low oil content, there is no need to add aeration and demulsification process. After this process, the oily sewage can meet the recharge standard, and the sludge treatment rate is as high as 98%.

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Abstract

The invention relates to a reinjection process for treating oily sewage without adding drugs, which mainly includes the following steps: after the oily sewage is subjected to sedimentation treatment, it is successively subjected to aeration and demulsification, swirling air flotation, collision coalescence, microflotation and adsorption filtration to obtain Water to be reinjected; an automatic oil collector is added to the sedimentation treatment process to remove oil, and the sludge mixture separated in each process section is collected into the sludge tank, and the sludge layer and supernatant are obtained by sedimentation and stratification, and the sludge layer is discharged after being concentrated . This process adopts the method of physical separation, and the separated water can be directly reinjected, which has the advantages of good degreasing effect and reducing floating oil and sludge.

Description

technical field [0001] The invention relates to the field of oily sewage treatment, more specifically, it relates to a reinjection process for treating oily sewage without adding chemicals. Background technique [0002] In the initial stage of oil field production, the production fluid produced from the oil well includes a mixture of produced crude oil, formation water and mud. In the process of petroleum refining, if water and crude oil are heated together, the water will rapidly vaporize and expand, and the pressure will increase, which may cause an explosion hazard. Therefore, before exporting crude oil, it needs to be dehydrated. After preliminary treatment, the produced fluid is separated to obtain oil and oily sewage. The oily sewage still includes slick oil, water and mud, and the water in the oily sewage mainly exists in the form of water-in-oil emulsion. In order to separate the water, conventional methods for treating oily sewage include microbial methods, chemic...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/02C02F103/10
CPCC02F9/00C02F1/001C02F1/24C02F1/28C02F1/38C02F1/40C02F1/52C02F11/12C02F2103/10C02F2301/08C02F2303/04C02F2303/14C02F2303/22
Inventor 周光辉
Owner ENMAN TECH BEIJING
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