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Method for treating aluminum-containing waste emulsion

A treatment method, biochemical treatment technology, applied in the direction of metallurgical wastewater treatment, chemical instruments and methods, multi-stage water treatment, etc., can solve the problem of low quality sewage, no mention of the treatment method of aluminum-containing emulsified waste liquid, and poor wastewater treatment Thoroughness and other issues, to achieve the effect of sequence layout optimization, water treatment cost reduction, and reasonable design

Inactive Publication Date: 2017-01-04
SHANGHAI EMPEROR OF CLEANING HI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above two published patents did not mention the specific treatment method for the aluminum-containing emulsified waste liquid, and the treatment of the waste water was not very thorough, and the quality of the treated sewage was not high.

Method used

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  • Method for treating aluminum-containing waste emulsion

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Experimental program
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Effect test

Embodiment 1

[0030] The aluminum-containing emulsified waste liquid discharged from a certain workshop has a COD of 100,000mg / L, an aluminum chip of 4g / L, and an oil concentration of 12-15wt%. The waste liquid is treated according to the method of the present invention, and the treatment capacity is 15t / d , the schematic diagram of the process flow is shown in figure 1 As shown, the specific steps are:

[0031] (1) Pretreatment: inject the aluminum-containing emulsified waste liquid into the demulsification tank, add non-ionic demulsifier and sulfuric acid, stir until the aluminum chips are completely dissolved, and adjust the pH in the demulsification tank to 5; inject the effluent from the demulsification tank into the air flotation tank , collect the upper oil slick into the collection tank, inject the lower liquid into the reaction tank, and control the pH in the reaction tank at 8-10; add sodium hydroxide into the reaction tank; the effluent from the reaction tank enters the sedimenta...

Embodiment 2

[0037] The aluminum-containing emulsified waste liquid discharged from a processing workshop has a COD of about 30,000mg / L, an aluminum scrap of about 2g / L, and an oil concentration of about 6%. Adopt the inventive method to process this waste liquid, the processing capacity is 10t / d, and concrete steps are:

[0038] (1) Pretreatment: inject the aluminum-containing emulsified waste liquid into the demulsification tank, add non-ionic demulsifier and hydrochloric acid, stir until the aluminum chips are completely dissolved, and adjust the pH in the demulsification tank to 3; inject the effluent from the demulsification tank into the air flotation tank , collect the upper floating oil to the collection tank, inject the lower clear liquid into the reaction tank, and adjust the pH in the reaction tank to 9; add sodium hydroxide into the reaction tank; the effluent from the reaction tank enters the sedimentation tank, and the sediment in the sedimentation tank is collected into the s...

Embodiment 3

[0044] An aluminum-containing emulsified waste liquid has an aluminum content of 3 mg / L, an emulsified oil content of 8 wt%, and a chemical oxygen demand of 80,000 mg / L. The waste liquid is treated by the method of the present invention, and the specific steps are as follows:

[0045] (1) Pretreatment: inject the aluminum-containing emulsified waste liquid into the demulsification tank, add non-ionic demulsifier and sulfuric acid, stir until the aluminum chips are completely dissolved, and adjust the pH in the demulsification tank to 2; inject the effluent from the demulsification tank into the air flotation tank , collect the upper oil slick into the collection tank, inject the lower liquid into the reaction tank, and control the pH in the reaction tank at 9; add sodium hydroxide into the reaction tank; the effluent from the reaction tank enters the sedimentation tank, and the sediment in the sedimentation tank is collected into the sludge The collection tank, the supernatant ...

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Abstract

The invention relates to a method for treating aluminum-containing waste emulsion. The method comprises the following four steps: pretreatment, membrane treatment, biochemical treatment and advanced treatment. The method disclosed by the invention comprises the following specific steps: demulsifying, and removing aluminum scraps, so that smooth subsequent treatment is guaranteed; removing the upper floating oil through air flotation, regulating the pH value to be alkaline, and allowing aluminum ions in the solution to form aluminum hydroxide floc, adsorbing suspended particulate matters in water in the floc sinking process, and removing one part of SS and COD in the liquid waste; performing membrane treatment on the pretreated liquid waste by adopting a vibrating membrane; performing biochemical treatment on effluent subjected to membrane treatment, wherein a treatment process of combining hydrolytic acidification and MBR is adopted during biochemical treatment; performing advanced treatment by adopting Fenton oxidation, and reaching the emission standard after treatment. Compared with the prior art, the method disclosed by the invention has the advantages that metal impurities such as the aluminum scraps are preferentially treated, and smooth subsequent membrane treatment is guaranteed; moreover, an extra coagulant is not needed during pretreatment, the water treatment cost is reduced, the aluminum-containing waste emulsion is completely treated in the invention, and the treated water is high in quality.

Description

technical field [0001] The invention relates to a treatment method for emulsified waste liquid, in particular to a treatment method for aluminum-containing emulsified waste liquid. Background technique [0002] Aluminum alloy is an important raw material in the production line of automobile ABS (anti-lock braking system). In the production process, aluminum alloy raw materials need to be processed by CNC machine tools. The emulsified waste liquid discharged during the production process of such machine tools often contains some aluminum chips. For the treatment of emulsified waste liquid, different treatment methods have been developed, such as sedimentation method, air flotation method, biological treatment method, etc. Among them, membrane treatment method has been widely used and promoted in recent years. However, when the aluminum-containing emulsified waste liquid is treated by the membrane treatment method, when the aluminum scrap enters the membrane device, it will c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F103/16
CPCC02F1/24C02F1/44C02F1/56C02F1/722C02F3/1268C02F9/00C02F2103/16C02F2301/08
Inventor 王炜
Owner SHANGHAI EMPEROR OF CLEANING HI TECH
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