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Short-range preprocessing method for cutting effluent

A cutting waste liquid and pretreatment technology, which is applied in water/sewage treatment, chemical instruments and methods, special compound water treatment, etc. High-efficiency demulsification, convenient oil-water separation, and simple operation for problems such as high oil content

Inactive Publication Date: 2017-06-13
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the acidification demulsification needs to adjust the pH to about 2, and the subsequent process needs to adjust the pH value to neutral, which will consume a lot of acid and alkali, and the demulsification effect is poor, and even some cutting waste liquid acidification demulsification has no effect, so acidification The demulsification method is not very versatile for different cutting waste fluids
Coagulation treatment has a certain demulsification effect, but the dosage of coagulant is large, and the sludge produced after demulsification has high oil content, which cannot be effectively filtered

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] Take 1000ml of cutting waste fluid produced by mechanical processing, its initial COD value is 68000mg / L, and its initial pH is 7.3. With sulfuric acid, the pH value of the waste liquid is adjusted to 3, and 6g of ferrous sulfate heptahydrate (0.0216molFeSO 4 ·7H 2 O), aerate and stir to dissolve, slowly add 24g of 30% hydrogen peroxide (containing 0.212mol H 2 o 2 ), reacted for 2h, left to separate after the reaction, and skimmed off the slick oil. Add Ca(OH) to the supernatant 2 , the pH of the solution was adjusted to 8, and then 10 mg of anionic PAM was added, stirred for 5 minutes, precipitated for 20 minutes, and the sediment was separated and filtered under pressure. After the above steps, the COD removal rate of the waste liquid is 95.4%.

Embodiment 2

[0016] Take 1000ml of cutting waste fluid produced by mechanical processing, its initial COD value is 88000mg / L, and its initial pH is 7.5. With sulfuric acid, the pH value of the waste liquid is adjusted to 3.5, and 7g ferrous sulfate heptahydrate (0.0252mol FeSO 4 ·7H 2 O), aerated and stirred to dissolve, slowly added 16.8g of 30% hydrogen peroxide (containing 0.148mol H 2 o 2 ), reacted for 2h, left to separate after the reaction, and skimmed off the slick oil. Add Ca(OH) to the supernatant 2 , the pH of the solution was adjusted to 8.5, and then 20 mg of anionic PAM was added, stirred for 5 minutes, precipitated for 20 minutes, and the sediment was separated and filtered under pressure. After the above steps, the COD removal rate of the waste liquid is 96.2%.

Embodiment 3

[0018] Take 1000ml of cutting waste fluid produced by mechanical processing, its initial COD value is 172620mg / L, and its initial pH is 9. With sulfuric acid, the pH value of the waste liquid is adjusted to 3.5, and 9g ferrous sulfate heptahydrate (0.0324mol FeSO 4 ·7H 2 O), aerate and stir to dissolve, slowly add 45g of 30% hydrogen peroxide (containing 0.4mol H 2 o 2 ), reacted for 2.5h, left to separate after the reaction, and skimmed off the slick oil. Add Ca(OH) to the supernatant 2 , the pH of the solution was adjusted to 9, then 20 mg of anionic PAM was added, stirred for 7 minutes, precipitated for 25 minutes, the sediment was separated, and the sediment was subjected to pressure filtration. After the above steps, the COD removal rate of the waste liquid is 90.2%.

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Abstract

The invention provides a short-range preprocessing method for cutting effluent. The method is characterized by comprising the following steps: adjusting a pH value of the cutting effluent to 3-4; adding soluble ferrite and hydrogen peroxide; uniformly mixing; reacting for 2-3 hours and then removing oil slick; adjusting a pH value of a bottom clean liquid to 8-9; adding a flocculating agent, stirring, fully precipitating the insoluble substances in the effluent and removing the sediment. According to the short-range preprocessing method provided by the invention, the efficient de-emulsification of the cutting effluent is realized; oil and water separation can be conveniently realized; the organic matters in high-concentration cutting effluent can be efficiently degraded; the COD removal rate is 90% or more and can reach up to 99% or more; the method is simple; the cost is low; the separated oily substances, such as machine oil and mineral oil, can be recycled; the short-range preprocessing method is suitable for large-scale industrial application.

Description

technical field [0001] The invention relates to a method for pretreatment of waste liquid, in particular to a method for short-range pretreatment of cutting waste liquid generated during mechanical processing by using Fenton's reagent. Background technique [0002] In the field of mechanical processing, emulsions are usually used to cool, lubricate and clean machine parts during cutting, grinding and rolling. After being recycled for many times, the emulsion will be corrupted and deteriorated, and its performance will be reduced, and then it will be replaced and discarded, thus forming a cutting waste liquid. The composition of this type of waste liquid is very complex, mainly containing water, surfactants, mechanical oil, minerals Oil, lubricant, additive, soluble organic matter, metal powder and solid suspension, etc. Due to the addition of the emulsifier, the oil, emulsifier and water in the cutting waste fluid form a very stable emulsified system. Its stabilization mec...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCC02F9/00C02F1/40C02F1/56C02F1/66C02F1/722C02F2305/026
Inventor 王新刚朱晖林雷雷张洁高天歌陈芳艳
Owner JIANGSU UNIV OF SCI & TECH
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