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Method and system for pretreatment of waste emulsion

A waste emulsion and pretreatment technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problems of high COD, large discharge, and high pollution intensity of waste emulsion

Inactive Publication Date: 2019-12-06
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] Therefore, the technical problem to be solved by the present invention is to provide a waste emulsion with low operating cost, high removal efficiency and simple operation for the characteristics of high COD, large discharge and high pollution intensity in the metallurgical manufacturing industry. Emulsion pretreatment technology reduces the pressure of downstream wastewater treatment. After this pretreatment, the waste emulsion can be subjected to subsequent biological treatment

Method used

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  • Method and system for pretreatment of waste emulsion
  • Method and system for pretreatment of waste emulsion
  • Method and system for pretreatment of waste emulsion

Examples

Experimental program
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Effect test

Embodiment 1

[0082] The waste emulsion first enters the primary separation tank for steam heating and separation. The heating time is about 6 hours, heated to 90°C, and passed through the secondary separation. The residence time of each separation is 3 hours, and the cooling temperature is 70°C. then by 1m 3 The flow rate per hour enters the oxidation reaction tank 4, by adjusting the pH value to 2, adding oxidizing agent 20L / hour (wherein hydrogen peroxide 18L / hour, nitric acid 2L / hour), catalyst 35L / hour. and stirred through an oxidation mixer, dwelling 45 minutes. Then enter the aeration tank 5 for aeration and oxidation, and enter the sedimentation tank after a residence time of about 3 hours. Continue to stay in the sedimentation tank for 4.5 hours, and the supernatant enters the neutralization flocculation tank. By adjusting the pH value of the waste emulsion to 9, add 20 L / hour evenly. Stir with a coagulation mixer, stay for about 30 minutes, enter the inclined plate sedimentation...

Embodiment 2

[0084] The waste emulsion first enters the primary separation tank for steam heating and separation. The heating time is about 6 hours, heated to 90°C, and passed through the secondary separation. The residence time of each separation is 3 hours, and the cooling temperature is 70°C. then by 1m 3 The flow rate per hour enters the oxidation reaction tank 4, by adjusting the pH value to 3, adding oxidizing agent 30L / hour (wherein hydrogen peroxide 27L / hour, peracetic acid 3L / hour), catalyst 45L / hour. and agitated through an oxidation mixer, leaving for about 45 minutes. Then enter the aeration tank 5 for aeration and oxidation, and enter the sedimentation tank after a residence time of about 3 hours. Continue to stay in the sedimentation tank for 4.5 hours, and the supernatant enters the neutralization flocculation tank. By adjusting the pH value of the waste emulsion to 11, add 30 L / hour evenly. Stir with a coagulation mixer, stay for about 30 minutes, enter the inclined plate...

Embodiment 3

[0086] The waste emulsion first enters the primary separation tank for steam heating and separation. The heating time is about 6 hours, heated to 90°C, and passed through the secondary separation. The residence time of each separation is 3 hours, and the cooling temperature is 70°C. then at 2m 3 The flow rate per hour enters the oxidation reaction tank 4, by adjusting the pH value to 3, adding oxidant 40L / hour (wherein hydrogen peroxide 36L / hour, ammonium persulfate 4L / hour), catalyst 70L / hour. and stirred through an oxidation mixer, dwelling 30 minutes. Then enter the aeration tank 5 for aeration and oxidation, and enter the sedimentation tank after a residence time of about 2 hours. Continue to stay in the sedimentation tank for 3 hours, and the supernatant enters the neutralization flocculation tank. By adjusting the pH value of the waste emulsion to 10, add 40 L / hour evenly. Stir with a coagulation mixer, stay for about 20 minutes, enter the inclined plate sedimentation ...

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Abstract

The invention discloses a method for pretreatment of waste emulsion. The method comprises the following three steps: oil-water separation, catalytic oxidation, and sedimentation and coagulation. The invention also provides a treatment system adopting the method. The treatment system comprises three separation tanks and an oxidation reaction tank which are connected in sequence and are respectivelyprovided with a first-stage lifting pump, a second-stage lifting pump and a third-stage lifting pump, wherein an outlet of the oxidation reaction tank is connected with an aeration tank, and an outlet of the aeration tank is connected with a sedimentation tank; an outlet of the sedimentation tank is connected with a neutralization coagulation tank, and an outlet of the neutralization coagulationtank is connected with an inclined-plate sedimentation tank; and the sedimentation tank and the inclined-plate sedimentation tank are separately connected with a suspension tank. The method and systemare good in treatment effect on the waste emulsion; the removal rate of COD in the waste emulsion reaches 98.74%-99.57%; and pretreated wastewater reaches the standard of wastewater capable of beingbiochemically treated. The system is simple in equipment, low in investment, wide in applicability, convenient to operate and maintain and low in later equipment maintenance cost and chemical feedingcost.

Description

technical field [0001] The invention relates to a method and system for treating waste emulsion. In particular, it relates to a pretreatment system for converting high-concentration waste emulsion into biochemically treatable low-concentration wastewater in industrial wastewater treatment. Background technique [0002] Waste emulsion is a kind of high-concentration and refractory organic wastewater, which contains a large amount of emulsifier (surfactant), mineral oil, preservative and metal scrap impurities, etc. It is characterized by high concentration of organic matter (usually COD concentration and petroleum ether The extract can reach 1000~100000mg / L), high chroma, intermittent discharge, small amount but high pollution intensity, etc. It is an important pollution source in industrial pollution sources. [0003] Iron and steel enterprise wastewater treatment station mainly treats various types of wastewater such as emulsion, concentrated alkali, concentrated tin solut...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/30
CPCC02F1/40C02F1/5236C02F1/5281C02F1/66C02F1/72C02F1/722C02F1/725C02F9/00C02F2101/30
Inventor 李宏张雷钟铭
Owner BAOSHAN IRON & STEEL CO LTD
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