Waste emulsion demulsification processing method

A waste emulsion and treatment method technology, which is applied in metallurgical wastewater treatment, chemical instruments and methods, filtration treatment, etc., can solve the problems of difficult solid-liquid separation and clear liquid turbidity, and achieve good water permeability, low water content, and reduced The effect of solid waste generation

Inactive Publication Date: 2017-05-10
ZHANGJIAGANG GREEN TECH ENVIRONMENTAL PROTECTION EQUIP
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a demulsification treatment method for waste emulsion, which uses adsorption and flocculation to achieve effective demulsification of waste emulsion, and solves the problems of slightly turbid clear liquid and difficult solid-liquid separation in the prior art.

Method used

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  • Waste emulsion demulsification processing method

Examples

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Effect test

Embodiment 1

[0029] The COD content in the waste lubricating fluid produced by a cutting steel wire factory is 78000mg / L, the copper ion content is 430mg / L, the zinc ion content is 355mg / L, and the pH value is 8.1. Add 5g / L of bentonite and 1.2g / L of sodium sulfide to the waste emulsion and stir for 30min, then add 6g / L of polyaluminum chloride, stir for 15min and adjust the pH value to 8.5 with sodium hydroxide, press filter , the whole demulsification process is completed. After demulsification, the content of COD in the serum was 8100mg / L, the total amount of copper and zinc was 11mg / L, and the removal rates of COD and heavy metals reached 89.6% and 98.6% respectively.

[0030] As shown in Figure 1(a), the comparison before and after the demulsification treatment shows that the waste emulsion is clear and transparent after the demulsification treatment. Such as figure 2 As shown, the filter cake obtained by solid-liquid separation after demulsification of the waste emulsion has good ...

Embodiment 2

[0032] The COD content in the waste cutting fluid produced by an auto parts factory is 155000mg / L, the total dissolved solids is 2300mg / L, and the pH value is 7.1. Add 12g / L of diatomaceous earth to the waste emulsion and stir for 30min, then add 5g / L of polyaluminum chloride and 0.1g / L of polyacrylamide, stir for 10min and adjust the pH value to 7.3 with sodium hydroxide , press filtration, and the whole demulsification process is completed. After demulsification, the COD content in the supernatant was 11000mg / L, the total dissolved solids was 5300mg / L, the COD removal rate reached 92.9%, and the increase of total dissolved solids was not significant, which was beneficial for subsequent treatment. Usually, the salting out method and acidification method will increase the total dissolved solids in the water to more than 20000mg / L. As shown in Figure 1(b), the comparison before and after the demulsification treatment shows that the waste cutting fluid is clear and transparent ...

Embodiment 3

[0034] The COD content in the waste emulsion produced by a metal product factory is 138000mg / L, the total copper and zinc ion content reaches 5300mg / L, and the pH value is 8.2. Add 10g / L diatomaceous earth and 5g / L sodium sulfide to the waste emulsion and stir for 45min, then add 10g / L polyferric sulfate, stir for 10min and adjust the pH value to 7.9 with sodium hydroxide, press filter , the whole demulsification process is completed. After demulsification, the content of COD in the clear liquid was 13500mg / L, the total content of copper and zinc ions was 27mg / L, and the removal rates of COD and heavy metal ions reached 90.2% and 99.5% respectively.

[0035]The results of the examples show that the method of the present invention adopts processes such as oil adsorption, flocculation and sedimentation, and solid-liquid separation. With obvious operability, it can be widely used in the disposal of waste emulsion, waste cutting fluid and waste saponification liquid in metal prod...

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Abstract

The invention belongs to the field of industrial waste water treatment, and relates to a waste emulsion demulsification processing method. The method employs at least one of bentonite, diatomite and activated clay as an adsorbent, employs at least one of polymeric aluminium, polymerization ferric chloride, polyferric sulfate and polyacrylamide as a flocculating agent, and performs demulsification processing on waste emulsion, wherein grease adsorption is carried out by an adsorbent, flocculation settlement is carried out by a flocculating agent, and solid-liquid separation is carried out. The method has the advantages of simple process, low operation cost, low energy consumption and high processing efficiency. the used agent has the advantages of nontoxicity and innocuousness, low cost and easy acquisition, has obvious maneuverability, and can be widely used for processing the waste emulsion, waste cutting fluid and waste saponification liquor for metal product, machining and other industries. According to the invention, more than 90% of chemical oxygen demand (COD) in the waste emulsion can be removed by a one step, and favorable condition can be provided for subsequent deep treatment such as chemical oxidation and biodegradation.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment, and relates to a demulsification treatment method of waste emulsion, in particular to the demulsification treatment of waste emulsion produced in metal processing processes such as cutting, grinding and drawing. Background technique [0002] The emulsion is mainly composed of mineral oil, surfactants, additives and water. It mainly plays the role of lubrication, cooling, and rust prevention in the metal processing process. After being used to a certain extent, it will deteriorate and become a waste emulsion. With the rapid development of industry, the discharge of waste emulsion is increasing day by day, which brings great pressure to environmental protection. The COD in the waste emulsion is usually as high as tens of thousands or even hundreds of thousands, and its main pollutant is mineral oil. After the waste emulsion enters the water, the oily substance floats on the water sur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/16
CPCC02F9/00C02F1/001C02F1/281C02F1/38C02F1/52C02F1/5236C02F1/56C02F1/66C02F2103/16
Inventor 尚建库徐正超
Owner ZHANGJIAGANG GREEN TECH ENVIRONMENTAL PROTECTION EQUIP
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