Device of oil-sewage ship for treating sewage and method thereof

Abstract

The invention relates to a device for treating oil stain water in an oil stain vessel and a method thereof, which belongs to the field of vessel sewage treatment and environment protection. The oil stain water treating device and the method treat the oil stain water by combining the pretreatment, middle treatment and post-treatment together. The pretreatment is finished in a multilevel oil separation and sedimentation chamber. The time between entering and flowing out is about 42 hours; the middle treatment is finished in the inclined board oil separation chamber and the gas floating chamber; the post-treatment adopts the multilevel filtering device. After the oil stain water in the vessel is treated through the multilevel oil separation and sedimentation, the inclined board oil separation, the gas floating and a multilevel filtering, in the drained oil stain water, the oil concentration is less than or equal to 5mg/L, even the oil concentration is less than or equal to 2mg/L. The oil stain treating device has the advantages of low investment, stable operation with safety and reliability, as well as simple, reliable and economic process of treating the oil stain water. The oil stain can be recycled with remarkable economic benefits.

Description

technical field [0001] The invention relates to a device and a method for treating oily sewage on an oily sewage ship, belonging to the fields of ship sewage treatment and environmental protection. Background technique [0002] The methods of ship oily sewage treatment mainly adopt physical method, chemical method and biological method. The physical method is to separate oil and water by physical phenomena such as density difference between oil and water or filtration and adsorption. The main feature is to separate oil and water without changing the chemical properties of oil; It is a method that can make oil condense into a gel and precipitate, and the aggregation agent makes the oil condense into a colloid to make it float, so as to achieve oil-water separation; biological methods include activated sludge method and biological filter. According to the nature of oily sewage and the requirements for the water quality after treatment, one or several methods can be used for c...

AI Technical Summary

Problems solved by technology

As the final stage or the facility before the final stage, the oil content of the import should not exceed 50mg / L, otherwise backwashing is frequent and the treatment effect is poor

[0005] To sum up, at present, most of the oily sewage from ships is discharged to the shore sewage treatment plant, and physical, chemical and biological methods are used for comprehensive treatment. The shore sewage treatment plant occupies a large area and has huge treatment equipment, which requires special docks for ships. There are many disadvantages

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