The waste water from ship washing mainly includes oily ballast water discharged during normal operation, oil tanker cleaning waste water and oily bilge water in engine room, etc. The wastewater has many pollutants, high chroma and high emulsification degree. Among them, emulsified oil is one of the main pollutants in this type of wastewater, which makes it difficult to separate oil and water and increases the difficulty of treatment.
Demulsifier is a kind of chemical agent that can destroy the stability of emulsion in the treatment of cabin washing wastewater. Demulsifier acts by charge neutralization: The positive cation released by the demulsifier interacts with the negative charge on the surface of the emulsion droplet, neutralizing the charge on the surface of the emulsion droplet, thus destroying the balance and stable charge protective layer of the emulsion droplet. According to the characteristics of the oil waste washing in the cabin, the demulsifier suitable for the wastewater type can be preliminarily screened, and the performance characteristics of different models can be further compared. Including demulsification effect, treatment time, dosage, applicability and so on. After determining the appropriate type of demulsifier, the demulsifier is added to the Marine oil wastewater in a certain proportion. Under the action of the demulsifier, the emulsified oil in the Marine oil wastewater will be destroyed and separated. At this time, oil and other pollutants in the wastewater can be further removed by subsequent treatment processes such as precipitation, filtration and adsorption.
The use of demulsifier in chemical treatment of cabin washing wastewater is an effective treatment method. By choosing suitable demulsifier type and adding it correctly, the stability of emulsion oil in oil wastewater can be destroyed and separated, so as to improve the efficiency and quality of wastewater treatment. Demulsifier itself and its decomposition products should not cause secondary pollution to the environment. However, it is necessary to pay attention to the applicability and appropriate dosage of demulsifier when using it, and combine the subsequent treatment process to achieve multi-faceted treatment of wastewater.
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