Technological method for recycling treatment of waste emulsified liquid

A technology of waste emulsion and process method, applied in chemical instruments and methods, special compound water treatment, filtration treatment, etc., can solve the problems of membrane damage, waste of resources, inability to reuse, etc., to prevent the precipitation of leachate, reduce The effect of running costs and reducing disposal costs

Active Publication Date: 2019-01-01
LUOYANG HAOHAI IND & TRADE
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  • Claims
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AI Technical Summary

Problems solved by technology

From the point of view of waste production enterprises, preliminary separation of oil and water slag can reduce the amount of hazardous waste, which can greatly reduce production costs. Therefore, the waste emulsion collected by disposal enterprises is generally high-concentration emulsion after evaporation treatment, black in color, Poor fluidity, viscous at low temperature, difficult to regenerate and dispose of, but incineration causes waste of resources, so it is urgent to develop a new process for the treatment and disposal of high-concentration waste emulsion
[0005] Patent No. 201810022218.5 High-concentration waste emulsion advanced treatment method, using adjustment, demulsification, stirring and membrane separation purification treatment, this method adds acid and mixed demulsifier, but there is still a mixed layer of oil residue in the middle that cannot be completely separated, and the subsequent membrane separation, Residue is easy to block the membrane channel, causing membrane damage or failure
The cost of mixing demulsifier is high, which increases the cost of secondary disposal. At the same time, the separated waste oil is not up to standard and cannot be reused
[0006] Patent No. 201710205207.6 A pretreatment method for waste emulsion, mainly for machining oily waste liquid, after pretreatment, homogeneous separation, two-stage demulsification, pH adjustment, Fenton oxidation, and then biochemical treatment. The treatment process of this method Long, high process control requirements, and the oil residue has not been disposed of

Method used

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  • Technological method for recycling treatment of waste emulsified liquid

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Comparison scheme
Effect test

Embodiment 1

[0024] Taking the waste emulsion produced by an aluminum processing enterprise as an example, its basic composition is about 55% water, about 25% oil phase, and about 20% slag. The specific disposal process is as follows:

[0025] 1. The raw material waste emulsion is sent to the pretreatment tank after passing through the pump and double cylinder filter, and it is heated to 80°C, stirred, and a certain proportion of separating agent (separating agent adopts sulfuric acid) is added at the same time, and the dosage is 1% of the waste emulsion. 1.5%, to achieve preliminary separation of oil, water and slag;

[0026] 2. After pretreatment, the lower layer is water and a small amount of slag, the middle mixture, and the upper layer is oil. The lower layer is pumped to the buffer tank 1, the intermediate mixture is sent to the buffer tank 2, and the upper layer oil is sent to the buffer tank 3.

[0027] 3. The water slag in the buffer tank 1 is pumped to the decanter centrifuge fo...

Embodiment 2

[0035] Take the waste emulsion produced by an aluminum processing enterprise as an example. Its basic composition is about 30% water, about 40% oil phase, and about 30% slag. The specific disposal process is as follows:

[0036] 1. The raw material waste emulsion is sent to the pretreatment tank after passing through the pump and double-tube filter, and it is heated to 60°C, stirred, and at the same time, a separating agent is added (separating agent adopts sulfuric acid and ferric chloride), and the dosage is the mass of the waste emulsion 0.5% of the oil, to achieve the preliminary separation of oil, water and slag;

[0037] 2. After pretreatment, the lower layer is water and a small amount of slag, the middle mixture, and the upper layer is oil. The lower layer material is pumped to the buffer tank 1, the intermediate mixture is sent to the buffer tank 2, and the upper layer oil is sent to the buffer tank 3;

[0038] 3. The water slag in the buffer tank 1 is pumped to the ...

Embodiment 3

[0044] Take the waste emulsion produced by an aluminum processing enterprise as an example. Its basic composition is about 55% water, about 15% oil phase, and about 50% slag. The specific disposal process is as follows:

[0045] 1. The raw material waste emulsion is sent to the pretreatment tank after passing through the pump and double-tube filter, and it is heated to 80°C, stirred, and at the same time, a separating agent is added (separating agent adopts sulfuric acid and ferric chloride), and the dosage is the mass of the waste emulsion 1% of the oil, to achieve the preliminary separation of oil, water and slag;

[0046] 2. After pretreatment, the lower layer is water and a small amount of slag, the middle mixture, and the upper layer is oil. The lower layer material is pumped to the buffer tank 1, the intermediate mixture is sent to the buffer tank 2, and the upper layer oil is sent to the buffer tank 3;

[0047] 3. The water slag in the buffer tank 1 is pumped to the deca...

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Abstract

The invention discloses a technological method for recycling treatment of waste emulsified liquid. The technological method comprises the following steps: (1) filtering the waste emulsified liquid andconveying the waste emulsified liquid into a pre-treatment tank; raising the temperature and stirring; adding a separation agent; dividing separated emulsified liquid into an upper layer, a middle layer and a lower layer; (2) conveying a lower-layer material into a centrifugal machine and separating to obtain waste dreg and wastewater I; carrying out high-temperature desorption on a middle-layermaterial; after condensing a gas phase, thus obtaining an oil-water mixture; meanwhile, obtaining wastewater II; conveying an upper-layer material into a distillation tower and carrying out vacuum treatment to obtain recyclable fuel oil; (3) carrying out secondary demulsification, Fenton oxidation and biochemical treatment on the wastewater I of step (2) and then discharging; carrying out the Fenton oxidation and the biochemical treatment on the wastewater II and discharging; (4) conveying tower-bottom waste dreg of the distillation tower in step (2) into a thermal desorption device and carrying out the high-temperature desorption; taking a generated gas phase as fuel gas for thermal desorption. The technology disclosed by the invention has the advantages that the quantity of the generatedwaste dreg is reduced, the oil content of residues can be reduced to be 1 percent or lower and the precipitation of leachate in treatment processes of backfilling and the like can be effectively prevented.

Description

technical field [0001] The invention relates to the field of waste utilization, in particular to a process method for recycling waste emulsion. Background technique [0002] Waste emulsion is mainly used in machinery manufacturing, steel rolling and metal processing industries for cleaning, rust prevention, lubrication and cooling. Its main components include base oil, emulsifier and additives, and a small amount of water. After the emulsion has been used many times, impurities such as metal shavings enter, causing the emulsion to fail and must be replaced, and the storage of the waste emulsion will also deteriorate, and its toxicity and pollution are very serious. Therefore, in our country, the waste emulsion is Included in the National Hazardous Waste List, the category is HW-09, and its collection, treatment and disposal are strictly controlled. [0003] With the rapid development of my country's economy, especially mechanical precision processing, such as the large-scal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C10G7/06C10G7/04C02F101/30
CPCC02F1/001C02F1/38C02F1/40C02F1/722C02F3/00C02F9/00C02F2101/30C02F2305/026C10G7/04C10G7/06
Inventor 徐品剧长生王旭阳
Owner LUOYANG HAOHAI IND & TRADE
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