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Treatment method of waste emulsion in machining
Release time:
2020-08-29
Emulsion is widely used in the machining industry, especially in the cutting, grinding and other processing processes of bearing and automotive parts processing enterprises. During use, the emulsion undergoes varying degrees of rancidity and performance degradation, so it is necessary to regularly replace it with a new emulsion. With the rapid development of industry, the discharge of this oily wastewater is increasing day by day. In addition to the hazards of general oily wastewater, waste emulsions are highly dispersed in water due to the action of surfactants, making it easier for animals, plants, and aquatic organisms to absorb. Moreover, surfactants themselves are harmful to organisms and can also dissolve some toxic substances that are insoluble in water. In order to improve the rust resistance of the emulsion, the added sodium nitrite is easily converted into carcinogenic nitrosamines, causing serious damage to the ecosystem and must be treated. At present, China has not yet effectively treated the high concentration and severely emulsified oily wastewater discharged from mechanical processing. Mainly due to the improvement of technology, the stability of the emulsion is becoming higher and harder to break.
The main treatment technologies for this type of wastewater at home and abroad include chemical demulsification, chemical electrolysis, activated carbon adsorption, or ultrafiltration (or reverse osmosis). Chemical demulsification method is an economical and simple water treatment method commonly used at home and abroad to improve the efficiency of water quality treatment. Due to its low requirements for raw water quality, simple treatment process and equipment, convenient operation, low energy consumption, and applicability to the treatment of waste emulsion in large, medium, and small enterprises, it is widely used.
The commonly used methods for demulsification include salting out, coagulation, acidification, and composite methods. This article takes the waste emulsion from the valve production workshop as the research object, selects the chemical demulsification method, and through laboratory experiments, selects the appropriate coagulant and determines the optimal dosage, pH range, and demulsification time. This has practical significance for guiding the wastewater treatment of enterprises.
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