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Method for treating waste cutting liquid by coupling technique

A combined technology and cutting fluid technology, applied in the direction of flotation water/sewage treatment, osmosis/dialysis water/sewage treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of poor biodegradability and achieve low working pressure , no secondary pollution, low operating costs

Inactive Publication Date: 2007-04-25
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, the water-soluble emulsified oil cutting fluid wastewater produced by some chemical companies in the production process contains base fluids (animal and vegetable oils, mineral oils, synthetic oils), oily agents (greases, fatty acids, higher alcohols), surfactants (anions system, non-ionic system), anti-rust agent, anti-corrosion agent and others such as defoamer, metal ion complexing agent, coloring agent, etc., with extremely poor biochemical properties

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Treatment effect of conventional flocculants on cutting fluid wastewater

[0023] The flocculation effect takes the value when the optimal amount of flocculant is used. The amount of anionic polyacrylamide used as a polymer coagulant aid is 15mg / L, COD Cr (Determination of Chemical Oxygen Demand) The water quality dichromate method (GB 11914-89) was used for analysis, the same below.

[0024] COD of raw water after oil separation treatment Cr : 76869mg / L, PH: 7-8, the flocculation results are shown in Table 1.

[0025] Table 1. The best effect of conventional flocculants on the treatment of cutting fluid wastewater

[0026] flocculant

Aluminum sulfate

(6%)

ferrous sulfate

(6%)

Polyaluminum

(1.5%)

poly iron

(1.5%)

COD after flocculation Cr

(mg / L) *

13048

14857

11840

13762

COD after flocculation Cr

(mg / L) **

14250

21048

11958

...

Embodiment 2

[0031] Compared with the treatment efficiency of eddy current method

[0032] Under the same experimental conditions (wastewater quality, water quantity and dosage are the same as that of the medicament), the wastewater was treated using the full-pressure dissolved air flotation method and the eddy current method, and polyaluminum was used as the flocculant, and the dosage was 1.5% of the wastewater volume. The treatment results See Table 2.

[0033] Table 2. Comparison of the wastewater treatment results between the full pressure dissolved air flotation method and the eddy current method

[0034] method

[0035] According to the experimental results, the flocculation of wastewater by the full pressure dissolved air flotation method is better than the eddy current method.

Embodiment 3

[0037] Treatment effect of flocculant on cutting fluid wastewater during scale-up

[0038] After confirming the use of chemicals, increase the amount of flocculation water to test the flocculation effect. From the above results, in order to achieve the best treatment effect, the amount of medicament should be 1.5% of the wastewater.

[0039] Raw water COD Cr : 76869mg / L, PH: 7-8, the flocculation results are shown in Table 4.

[0040] Table 4. Treatment effect of different flocculants on cutting fluid wastewater during scale-up

[0041] Amount of water sample (ml)

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Abstract

The present invention relates to industrial effluent treating technology, and is especially one kind of comprehensive cutting effluent treating technological method. The technological process includes the first air floatation-flocculation treatment in pressure of 0.2-0.4 MPa and flocculant consumption of 0.1-6 wt% of the effluent; subsequent ultrafiltration-reverse osmosis treatment including two-stage of microfilm filtering at 0.05-0.6 MPa and reverse osmosis at 0.5-1.5 MPa; and final electrical multiphase catalytic oxidation in the voltage 10-15 V and current density of 100-400 mA / sq dm and in the presence of supported catalyst with Fe or Mn oxide as the active component and in the amount of 1 / 5 to 5 / 6 of effluent volume. The present invention has the advantages of high effluent treating effect resulting in capacity of direct exhaust, low treatment cost, simple operation and no secondary pollution.

Description

technical field [0001] The invention relates to industrial waste water treatment technology, in particular to a method for treating cutting fluid waste water by using combined technology. Background technique [0002] At present, the water-soluble emulsified oil cutting fluid wastewater produced by some chemical companies in the production process contains base fluids (animal and vegetable oils, mineral oils, synthetic oils), oily agents (greases, fatty acids, higher alcohols), surfactants (anions system, non-ionic system), anti-rust agent, anti-corrosion agent and others such as defoamer, metal ion complexing agent, coloring agent, etc., have extremely poor biochemical properties. [0003] The air flotation method is mainly to introduce or generate a large number of bubbles in the water to form a three-phase heterogeneous system of water, gas and the substance to be removed. The combination floats to the surface of the water to separate from the water. The flocculation me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/24C02F1/52C02F1/44
Inventor 杨旭于永辉孙承林杜远华蔡钊荣肖羽堂
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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