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Zero-emission treatment process of cutting liquid wastewater

A treatment process and cutting fluid technology, applied in the field of cutting fluid wastewater treatment technology, can solve the problems of membrane flux attenuation, high treatment cost, and inability to fully realize zero discharge of wastewater, and achieve the effect of reducing formation and improving membrane flux.

Active Publication Date: 2019-03-29
大连博斯特科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, there are also certain problems in membrane separation, which are mainly manifested in: the composition of cutting fluid wastewater is complex, not only contains a large number of metal particles after cutting, but also contains more components such as surfactants, emulsified oil, high molecular polymers, etc. It is easy to cause compound pollution formed by particles, emulsions, and polymers on the surface of the ceramic membrane, resulting in rapid attenuation of membrane flux and difficulty in membrane regeneration. At the same time, there are also problems such as large investment, cumbersome membrane cleaning, and strict requirements for wastewater pretreatment. The problem of high processing costs, and the use of ceramic membranes for treatment cannot completely achieve zero discharge of wastewater, which will lead to a large amount of ceramic membrane concentrates that need to be incinerated

Method used

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  • Zero-emission treatment process of cutting liquid wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The cutting fluid wastewater is sent to the water-oil-solid three-phase cyclone separator for treatment. The pressure difference between the solid phase outlet of the water-oil-solid three-phase cyclone separator and the feed is 0.15MPa, and the oil-water-solid three-phase The output volume ratio is 0.2:3.2:1.1, the feed flow rate is 4m / s, the water phase is sent to the cutting process for reuse; the solid phase outlet of the cyclone separator is sent to the first ceramic membrane for concentration treatment, and the first ceramic membrane The average pore size is 500nm, cross-flow filtration mode is adopted, the membrane surface flow rate is 4m / s, and the operating pressure is 0.3MPa. The concentrated liquid of the first ceramic membrane is sent to the plate and frame filter press to filter out large particles of metal slag, and the plate and frame filter press The filtrate of the machine is returned to the first ceramic membrane to be filtered again, and the filtrate o...

Embodiment 2

[0038] The cutting fluid wastewater is sent to the water-oil-solid three-phase cyclone separator for treatment. The pressure difference between the solid phase outlet of the water-oil-solid three-phase cyclone separator and the feed is 0.35MPa, and the oil-water-solid three-phase The output volume ratio is 0.25: 4.2: 1.4, the feed flow rate is 6m / s, the water phase is sent to the cutting process for reuse; the solid phase outlet of the cyclone separator is sent to the first ceramic membrane for concentration treatment, and the first ceramic membrane The average pore size is 500nm, cross-flow filtration mode is adopted, the membrane surface flow rate is 4m / s, and the operating pressure is 0.2MPa. The filtrate of the machine is returned to the first ceramic membrane to be filtered again, and the filtrate of the first ceramic membrane is sent to the cutting process for reuse;

[0039] Step 3, the oil phase in step 1 is mixed with the extractant, the extractant is mixed with KOH a...

Embodiment 3

[0041] The cutting fluid wastewater is sent to the water-oil-solid three-phase cyclone separator for treatment. The pressure difference between the solid phase outlet of the water-oil-solid three-phase cyclone separator and the feed is 0.2MPa, and the oil-water-solid three-phase The output volume ratio is 0.2:3.8:1.2, the feed flow rate is 5m / s, the water phase is sent to the cutting process for reuse; the solid phase outlet of the cyclone separator is sent to the first ceramic membrane for concentration treatment, and the first ceramic membrane The average pore size is 500nm, cross-flow filtration mode is adopted, the membrane surface flow rate is 3m / s, and the operating pressure is 0.4MPa. The filtrate of the machine is returned to the first ceramic membrane to be filtered again, and the filtrate of the first ceramic membrane is sent to the cutting process for reuse;

[0042] Step 3, the oil phase in step 1 is mixed with the extractant, the extractant is mixed with KOH and n...

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Abstract

The invention relates to a zero-emission treatment process of cutting liquid wastewater and belongs to the technical field of water treatment. According to the zero-emission treatment process, metal components and cutting liquid of the cutting liquid wastewater can be recycled, forming of an organic-inorganic composite pollution layer on the surface of a ceramic membrane is reduced advantageously,and the membrane flux is increased advantageously.

Description

technical field [0001] The invention relates to a treatment process for cutting fluid waste water, which belongs to the technical field of water treatment. Background technique [0002] Cutting fluid is widely used in mechanical processing, mainly for cooling, lubrication, cleaning, rust prevention and so on. Cutting fluid can be divided into two categories: oil-based cutting fluid and water-based cutting fluid. With the development of machining automation process, the usage of flame retardant water-based cutting fluid is gradually increasing. According to statistics, the current usage of oil-based cutting fluid accounts for 23% of the total, and water-based cutting fluid accounts for 77%. Water-based cutting fluid waste liquid belongs to oily wastewater with high concentration of organic matter. After pretreatment by physical and chemical methods, it still needs to be diluted in large quantities before biological treatment can be carried out, resulting in high treatment...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/34
CPCC02F9/00C02F1/04C02F1/26C02F1/38C02F11/122C02F1/441C02F1/44C02F1/4693C02F2301/08C02F2301/046C02F2209/10C02F2209/08C02F2103/34Y02A20/131
Inventor 王莉毛强平
Owner 大连博斯特科技有限公司
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