Method for treating and recycling hot-rolling high-oil-containing waste water in iron and steel plant

Abstract

The invention discloses a method for treating and recycling hot-rolling high-oil-containing waste water in iron and steel plant, and belongs to the technical field of waste water treatment. Oil-containing waste water from an oil house, a hydraulic pressure station and a lubrication station of a hot-rolling workshop and high-oil-containing waste water of a rear earth magnetic disk filtration sump are respectively lifted to a grid and a water distribution groove of a high-oil-containing waste water treating and recycling facility by a pump; the oil-containing waste water and the high-oil-containing waste water enter multifunctional oil residue separators after removing sundries with large volume in the waste water; and the two multifunctional oil residue separators alternately input water, purify, deposit, output water and output slag chronologically. The method has the advantages of: really realizing zero emission of the high-oil-containing waste water of the iron and steel plant, effectively protecting water environment, saving water resources, reducing overall investment of a project, reducing comprehensive operating cost, and realizing good economic benefit and social benefit.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment, and in particular provides a method for treating and reusing waste water with high oil content in hot rolling of iron and steel plants. Background technique [0002] At present, the hot rolling oily wastewater discharged from various domestic iron and steel plants is difficult to treat due to high oil content, large water volume changes, and high suspended solids content. Even after treatment, the oil content in the hot-rolling wastewater is still high, which directly affects the product quality of the hot-rolled plate and the effect of advanced treatment at the rear, which increases the treatment cost and maintenance workload, so recycling cannot be realized, resulting in The amount of water discharged outside the steel plant is large, which seriously pollutes the environment and wastes water resources. Although various enterprises have adopted certain waste water reuse measures i...

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Problems solved by technology

Even after treatment, the oil content in the hot-rolling wastewater is still high, which directly affects the product quality of the hot-rolled plate and the effect of advanced treatment at the rear, which increases the treatment cost and maintenance workload, so recycling cannot be realized, resulting in The amount of water discharged outside the steel plant is large, causing serious environmental pollution and a waste of water resources

Although various enterprises have adopted certain waste water reuse measures in response to the above situations in actual production, due to the variety of waste water, complex water quality, and lack of effective technical routes, the effect of waste water recycling in actual production is not obvious. At the same time, due to A large amount of waste water is discharged outside, destroying the water balance of the steel plant

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