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Microwave demulsifying and purifying method for emulsifying liquid waste water

A technology of emulsion and purification method, applied in the field of water treatment, can solve the problems of slow rise of emulsion breaking temperature, poor economic benefit and demulsification effect, large energy consumption, etc., and achieves remarkable oil-water separation phenomenon, easy automatic control, and reaction energy. low consumption effect

Inactive Publication Date: 2005-08-03
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The deficiencies in the heating demulsification method are: (1) The temperature of the demulsification is slow to rise, resulting in an excessively long industrial operation period of the entire demulsification process; (2) The energy utilization rate is low, resulting in a large amount of energy waste and poor economic benefits
The shortcomings of electric demulsification technology are: (1) it can only act on W / O emulsion, and it is difficult to achieve the effect of demulsification for O / W (oil-in-water) emulsion with large water content; (2) it needs External high-voltage electric field consumes a lot of energy and has low safety
The disadvantages of the physical demulsification method are: (1) in general, especially for microemulsions, the speed of droplet polymerization is relatively slow. If there is a surfactant, the droplet will not polymerize or the speed will be extremely slow; (2) Due to the slow speed, the gravity settling equipment is huge, the centrifugal demulsification consumes a lot of energy, and the economic benefit and demulsification effect are poor.
The disadvantages of the chemical demulsification method are: (1) For different emulsion systems, different demulsifiers must be studied and used, otherwise good results cannot be achieved; The treated system brings some adverse effects, so the application of chemical demulsification method is greatly restricted

Method used

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  • Microwave demulsifying and purifying method for emulsifying liquid waste water

Examples

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Effect test

Embodiment 1

[0036] Treatment of emulsion wastewater provided by Dalian XX Company by using ferric sulfate as flocculation demulsifier

[0037] The color of the emulsion wastewater provided by Dalian XX Company is milky white, the pH value is neutral, and it is the emulsion wastewater with moderate oil content, chemical requirements and nutrients. The result of water quality analysis is: O / W (oil-in-water) type emulsion, its pH value is 7.06, COD Cr The index value is 24976.5mg / L, BOD 5 The (biochemical oxygen demand) index value is 4018.9mg / L, and the oil content is 4913.0mg / L.

[0038] Microwave Demulsification and Purification of Emulsion Wastewater

[0039] Utilize the microwave demulsification purification method of emulsion wastewater in the present invention, adopt a microwave demulsification reactor to the processing of cutting emulsion wastewater, its steps are:

[0040]In the first step, the emulsion wastewater to be treated is injected into the demulsification reactor [19] un...

Embodiment 2

[0047] Treatment of emulsion wastewater provided by Dalian XX Company by polyaluminum chloride and polyferric sulfate compound flocculation demulsifier

[0048] The water quality analysis results of the emulsion wastewater provided by Dalian ×× company are the same as in Example 1, being: O / W (oil-in-water) type emulsion, its pH value is 7.06, COD Cr The index value is 24976.5mg / L, BOD 5 The index value is 4018.9mg / L, and the oil content is 4913.0mg / L.

[0049] According to the microwave demulsification and purification operation steps described in the claims of the present invention, a microwave demulsification reactor is used to treat the cutting emulsion wastewater, and the steps are the same as in Example 1, wherein: the emulsion wastewater to be treated is injected into the demulsification The volume of the reactor [19] is about 1 / 2 of the volume of the demulsification reactor [19]; ​​in this embodiment, the polyaluminum chloride solution is mixed with the polyferric sul...

Embodiment 3

[0052] Treatment of industrial cutting fluid emulsion wastewater produced in XX workshop of XX machine tool factory by using a microwave demulsification reactor

[0053] This is a XX workshop of XX Machine Tool Factory with an annual production capacity of 3 tons of emulsion wastewater. The composition of emulsion wastewater is uniform and stable, milky yellow in color, COD Cr It is 50000-200000mg / L, the pH value is alkaline, and it is emulsion wastewater with high oil content and chemical nutrient requirements.

[0054] Sampling analysis results

[0055] Water quality parameters: the emulsion wastewater is O / W (oil-in-water) type emulsion, its pH value is 11.60, COD Cr The index value is 99568.4mg / L, BOD 5 The index value is 28331.4mg / L, and the oil content is 15301.15mg / L.

[0056] Flocculation Demulsifier Selection

[0057] The polyferric sulfate liquid industrial product commonly used in water treatment was selected and purchased, and the total iron content of the poly...

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Abstract

The microwave method of demulsifying and purifying emulsifying liquid waste water in water processing field features that microwave irradiation is adopted in processing emulsifying liquid waste water. The flocculating demulsifier solution is compounded with calcium chloride, aluminum chloride, ferric chloride, aluminum sulfate, ferric sulfate, polyaluminum sulfate, polyferric sulfate and polyacrylamide and the added amount is 0.5-25.0 g / L. The microwave has frequency 2450 MHz or 915 MHz, power 0.4-64 kw, and irradiation time 1-5 min. The microwave demulsifying reactor consists of mainly microwave generator and demulsifying reactor. The present invention has the advantages of oil content lowering rate over 95 %, CODCr lowering rate of about 80 %, short reaction time, low reaction power consumption and easy oil-water separation.

Description

technical field [0001] The microwave demulsification and purification method of emulsion wastewater of the present invention relates to the treatment of emulsion wastewater in the mechanical processing industry, especially industrial cutting emulsion wastewater with high oil content, high stability and refractory degradation, and belongs to the field of water treatment. Background technique [0002] Oil-water emulsification occurs in many industrial processes, that is, a phenomenon in which oil molecules and water molecules contain each other in a liquid state. Therefore, demulsification technology has a wide range of applications: the existence of oil-water emulsions in the petroleum industry will increase the burden on storage and transportation, reduce the service life of pipelines, and must separate oil and water; in liquid-liquid contact such as the emulsion formed during the extraction process or Solution entrainment Demulsification is required in these applications to...

Claims

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Application Information

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IPC IPC(8): C02F1/00C02F1/52
Inventor 全燮马宁陈硕赵雅芝赵慧敏
Owner DALIAN UNIV OF TECH
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