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A treatment method for ultra-low discharge of emulsion wastewater in manufacturing industry

A treatment method and technology for emulsification, applied in the fields of environmental protection and wastewater treatment, can solve the problems of unsuitable emulsification of wastewater, poor effect, waste of resources, etc., and achieve improved biodegradability, good demulsification effect, and improved effluent quality. Effect

Active Publication Date: 2021-09-21
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are many methods of demulsification, but many of them are not suitable for emulsified waste water. As a result, coagulation and air flotation are still used to treat emulsion waste water and waste liquid in many treatment processes, resulting in a lot of waste of resources. Some manufacturers even only use dilution methods. High cost and poor results
At present, there is no good technology on the market to treat this kind of wastewater

Method used

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  • A treatment method for ultra-low discharge of emulsion wastewater in manufacturing industry
  • A treatment method for ultra-low discharge of emulsion wastewater in manufacturing industry
  • A treatment method for ultra-low discharge of emulsion wastewater in manufacturing industry

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Emulsion wastewater after sand removal, water quality: pH 8.0, water temperature 20°C, COD concentration 50,000 mg / L, ammonia nitrogen concentration 260 mg / L, total nitrogen concentration 1100 mg / L, total phosphorus concentration 280 mg / L .

[0040] S1. Demulsification: Add 12mol / L hydrochloric acid to 1 ton of emulsion wastewater after desanding and stir until pH<5, then naturally settle for 30 minutes to separate oil and water, collect waste oil from the upper layer for recycling, and collect wastewater from the lower layer for further processing;

[0041] S2. Ultrafiltration: Under 0.2Mpa pressure, the wastewater in the lower layer is ultrafiltered through a cerium oxide-modified flat ceramic membrane. The concentrated liquid is returned to S1 for demulsification, and the ultrafiltered water is added with a regulator to adjust the pH value to 7;

[0042] S3. Ozone catalytic oxidation: introduce the adjusted ultrafiltration water into the ozone catalytic oxidation un...

Embodiment 2

[0047] The water quality of the emulsion wastewater after sand removal: pH is 8.2, water temperature is 20°C, COD concentration is 180,000 mg / L, ammonia nitrogen concentration is 308 mg / L, total nitrogen concentration is 902 mg / L, and total phosphorus concentration is 840 mg / L .

[0048] S1. Demulsification: After desanding 1 ton of emulsion wastewater, add 12mol / L hydrochloric acid and stir until pH<3, settle naturally for 15 minutes to separate oil and water, collect waste oil from the upper layer for recycling, and collect wastewater from the lower layer for further processing;

[0049] S2. Ultrafiltration: Under 0.3Mpa pressure, the wastewater in the lower layer is ultrafiltered through a cerium oxide-modified flat ceramic membrane, the water output is 60-90%, the filtration flow rate is about 10-200LMH, the membrane pore size is about 0.05μm, and the ultrafiltration dope Return to S1 for demulsification, and add a regulator to the ultrafiltered water to adjust the pH valu...

Embodiment 3

[0055] Emulsion wastewater after desanding, water quality: pH is 9.0, water temperature is 22°C, COD concentration is 150,000 mg / L, ammonia nitrogen concentration is 380 mg / L, total nitrogen concentration is 1400 mg / L, and total phosphorus concentration is 620 mg / L .

[0056] S1. Demulsification: After desanding 1 ton of emulsion wastewater, add 12mol / L hydrochloric acid and stir until pH<3, settle naturally for 15 minutes to separate oil and water, collect waste oil from the upper layer for recycling, and collect wastewater from the lower layer for further processing;

[0057] S2. Ultrafiltration: Under 0.3Mpa pressure, the wastewater in the lower layer is treated by ultrafiltration through a flat ceramic membrane modified by cerium oxide. The water output is 60-90%, the filtration flow rate is about 10-200LMH, and the membrane pore The solution is returned to S1 for demulsification, and the ultrafiltered water is added with a regulator to adjust the pH value to 9;

[0058] ...

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Abstract

The invention discloses a treatment method for ultra-low discharge of emulsion wastewater in a manufacturing industry, belongs to the field of environmental protection, and specifically relates to the field of wastewater treatment. The treatment method includes demulsification, ultrafiltration, ozone catalytic oxidation, multi-stage AO+MBR treatment and ion exchange adsorption; this treatment method can effectively solve the problems of high cost, complicated operation, low treatment efficiency and comprehensive recycling effect of the existing emulsion wastewater. Poor problem. After the emulsion wastewater is comprehensively treated by the treatment method of the present invention, the oil content of the effluent is ≤10mg / L, the suspended solids SS≤30mg / L, and the chemical oxygen demand CODcr≤100mg / L, which completely solves the emulsification of the manufacturing industry. Liquid waste water can be treated up to the standard for discharge or reuse, and at the same time, the recycling of base oil is realized. The treatment process is efficient, energy-saving, and easy to operate and use.

Description

technical field [0001] The invention belongs to the field of environmental protection, in particular to the field of waste water treatment, in particular to a treatment method for ultra-low discharge of emulsion waste water in manufacturing industry. Background technique [0002] The rapid improvement of my country's economic level is inseparable from the support of mechanical processing and vehicle and ship manufacturing industries. Emulsions are widely used in these industries. Various emulsions can lubricate, cool, prevent rust, and clean tools and workpieces in machining and manufacturing. After the emulsion is recycled many times, it will become rancid and deteriorate to varying degrees, and its performance will be reduced. It needs to be replaced to form a waste emulsion, and the emulsion wastewater comes from this. Its main components are base oil, emulsifier, preservative, surfactant and so on. Its chemical composition is complex and the concentration of pollutants...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14C02F3/30C02F3/12C02F1/44C02F1/28C02F1/42
CPCC02F1/444C02F1/725C02F1/78C02F3/1268C02F3/30C02F9/00C02F2001/422C02F2209/08Y02W10/10
Inventor 张涛闫科丞阮金锴
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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