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

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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 el

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

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Example Embodiment

[0047] Example 1

[0048] The emulsified waste liquid comes from the lubricating fluid and cleaning fluid produced by an engine factory in Shanghai. Use 0.4% NaOH solution to adjust the pH to 5, the waste water starts to evaporate into water vapor at a negative pressure (80kPa) and the temperature is 70°C, and the water vapor condenses into a distilled clear liquid, which is collected and discharged into the multi-stage combined advanced oxidation reactor 03; Manganese dioxide (as an ozone catalyst) is added to the reactor, the dosage is 100 mg / L, the dosage of ozone is 1 mg / L, the concentration of introduced ozone is 60 mg / L, and the hydraulic retention time is 30 min; H 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; adjust the pH to about 8 with NaOH solution, and enter the vertical flow sedimentation tank 06 for precipitation and separation. See Table 1 for the effluent quality of each process. T...

Example Embodiment

[0052] Example 2

[0053] The same procedure was carried out as described in Example 1. The COD of the wastewater is 30000mg / L, the pH is 7, the TOC is 5000mg / L, and the hardness is 300mg / L (in terms of CaCO 3 count). The pH was adjusted to 6 with NaOH solution, and the wastewater began 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 the injected ozone 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, the Venturi injection position is located 1 / 3 from the bottom of the reactor. The distillation concentration ratio of the final emulsified waste liquid is 19, the recovery rate of clean water is 95%, and 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 ...

Example Embodiment

[0056] Example 3

[0057] The same operation was performed as described in Example 1, but the treated water was different, and the control conditions and parameters were different. The pH was adjusted to 5.5 with NaOH solution, and the wastewater started to evaporate into water vapor at 60kPa and the temperature was 80℃; the ozone catalyst MnO 2 The dosage is 250mg / L, the dosage of ozone is 3mg / L, the concentration of the injected ozone 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 at 1 / 2 of the bottom of the multi-stage combined advanced oxidation reactor 03. See Table 3 for the effluent quality of each process. The recovery rate of distilled water from the final emulsified waste liquid reaches 92%, and the effluent after precipitation meets the requirement of self-reuse.

[0058] Table 3 Analysis table of water quality of each process

[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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