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Low-salt recycling technology for mechanical cutting emulsified liquid waste

A technology of mechanical cutting and waste liquid, applied in chemical instruments and methods, special compound water treatment, oxidized water/sewage treatment, etc., can solve the problems of low electrochemical separation efficiency, affecting the recycling route, and low wastewater recycling rate. , to achieve the effect of reducing the dosage, reducing the treatment cost and saving the cost of water

Active Publication Date: 2016-08-31
SHANGHAI JIAO TONG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Chinese patent "Oil-Containing Emulsion Wastewater Treatment Process" with the publication number CN101244879B adopts electrochemical / oxidation combination technology, and uses chemical oxidation to demulsify after the separation of oil (slag) and water. However, the electrochemical separation efficiency is low and the wastewater can be reused. The efficiency is low, a large amount of flocculant and oxidant are added in the process of demulsification, and a large amount of salt is brought in, which affects the subsequent recycling method

Method used

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  • Low-salt recycling technology for mechanical cutting emulsified liquid waste
  • Low-salt recycling technology for mechanical cutting emulsified liquid waste
  • Low-salt recycling technology for mechanical cutting emulsified liquid waste

Examples

Experimental program
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Effect test

Embodiment 1

[0048] The emulsified waste liquid comes from the lubricating liquid and cleaning liquid produced by an engine manufacturing plant in Shanghai. Use 0.4% NaOH solution to adjust the pH to 5. The waste water begins to evaporate into water vapor at a negative pressure (80kPa) and a temperature of 70°C. The water vapor is condensed into a distilled clear liquid, which is collected and discharged into the multi-stage combined advanced oxidation reactor 03; Add manganese dioxide (as an ozone catalyst) in the reactor, the dosage is 100mg / L, the dosage of ozone is 1mg / L, the concentration of ozone is 60mg / L, and the hydraulic retention time is 30min; 2 o 2 The dosage is 0.4%, H 2 o 2 :Fe 2+ =2:1, the Venturi dosing position is located at 2 / 3 of the reactor elevation; use NaOH solution to adjust the pH to about 8, and enter the vertical flow sedimentation tank 06 for precipitation and separation. The effluent water quality of each process is shown in Table 1. The distillation conc...

Embodiment 2

[0053] The same procedure was carried out as described in Example 1. Wastewater COD is 30000mg / L, pH is 7, TOC is 5000mg / L, hardness is 300mg / L (as CaCO 3 count). Use NaOH solution to adjust the pH to 6, and the waste water begins to evaporate at a negative pressure (40kPa) and a temperature of 90°C; the ozone catalyst MnO in the reactor 2 The dosage is 400mg / L, the dosage of ozone is 5mg / L, the concentration of ozone introduced is 120mg / L, and the hydraulic retention time is 90min; H 2 o 2 The dosage is 0.6%, H 2 o 2 :Fe 2+ = 4:1, Venturi injection position is located at 1 / 3 from the bottom of the reactor. The distillation concentration rate of the final emulsified waste liquid is 19, and the recovery rate of clear water reaches 95%. The effluent after precipitation has low salt, low concentration, and low hardness, which meets the requirements of self-reuse. The effluent from the vertical flow sedimentation tank 06 enters the clear water tank. The effluent water qual...

Embodiment 3

[0057] The same operation was carried out as described in Example 1, but the treated water was different, and the control conditions and parameters were different. Use NaOH solution to adjust the pH to 5.5, and the wastewater starts to evaporate into water vapor at 60kPa and 80°C; the ozone catalyst MnO 2 The dosage is 250mg / L, the dosage of ozone is 3mg / L, the concentration of ozone introduced is 90mg / L, and the hydraulic retention time is 60min; H 2 o 2 The dosage is 0.5%, H 2 o 2 :Fe 2+ =3:1, the dosing position is located 1 / 2 away from the bottom of multi-stage combined advanced oxidation reactor 03. See Table 3 for the effluent quality of each stage of the process. The recovery rate of distilled water from the final emulsified waste liquid reaches 92%, and the effluent after precipitation meets the requirements of self-reuse.

[0058] Table 3 Water quality analysis table of each process effluent

[0059]

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Abstract

A low-salt recycling technology for mechanical cutting emulsified liquid waste includes vacuum distillation separation and microbubble ozone / H2O2 / Fe2+collaborative multistage combined advanced oxidation so as to achieve distillation and concentration of the mechanical cutting emulsified liquid waste and recycling of clear water. The low-salt recycling technology for the mechanical cutting emulsified liquid waste has the advantages that low-concentration distilled clear fluid is obtained via a vacuum distillation technique, and accordingly salt content of wastewater is decreased, oil can be separated from water effectively, the concentration ratio and wastewater recycling quantity are increased, chemical feeding quantity is decreased and treatment cost is reduced; by the aid of the microbubble catalytic ozonization / H2O2 / Fe2+ combined advanced oxidation technique, stability of residual emulsified oil in the distilled clear fluid is destroyed, recycling efficiency and feasibility of the emulsified liquid waste are guaranteed, and pollution of the oil-containing emulsified liquid waste to the environment can be reduced while water resources can be used fully to alleviate water resource shortage; the low-salt recycling technology can be used for treating and recycling emulsified liquid waste produced during machining and particularly during engine lubrication and cleaning.

Description

technical field [0001] The present invention relates to vacuum distillation of waste liquid and microbubble ozone / H 2 o 2 / Fe 2+ The synergistic multi-stage combination advanced oxidation treatment technology specifically relates to a low-salt recycling process of mechanical cutting emulsified waste liquid, which belongs to the field of environmental protection technology. Background technique [0002] Emulsions are used in machinery and metal processing, usually oil-in-water (O / W) emulsions are used as lubricants, cleaning agents, coolants, and anti-rust agents to reduce thermal effects, reduce friction, and extend tools Life, improve production efficiency and processing quality. The emulsified waste liquid after use is a large amount of industrial organic wastewater that is difficult to treat. It contains a wide variety of components such as oils and emulsifiers, and contains many toxic and carcinogenic additives. It is easy to spread after entering natural water bodies...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/52C02F1/66C02F1/722C02F1/725C02F1/78C02F9/00C02F2305/023C02F2305/026
Inventor 楼紫阳尹常凯朱南文袁海平吴革军杨勇王辉
Owner SHANGHAI JIAO TONG UNIV
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