Oily wastewater treatment device and treatment method in steel industry

Abstract

The invention discloses an oily wastewater treatment device and an oily wastewater treatment method in a steel industry. The oily wastewater treatment device is arranged between a regulating tank and a treatment water tank, and the oily wastewater is preliminarily stayed in the regulating tank and then fed to a primary reaction flocculating tank; a coagulant and a coagulant aid medicament are fed into the primary reaction flocculating tank, and sodium hydroxide is fed according to the pH value of water; the oily wastewater successively enters a secondary reaction flocculating tank through a cavitation-aeration air floatation device; the coagulant and the coagulant aid medicament are fed into the secondary reaction flocculating tank, and sodium hydroxide is also fed according to the pH value of the water quality; and the oily wastewater successively enters a sedimentation tank, the overflowing clear water enters a third reaction flocculating tank, the coagulant and the coagulant aid medicament are fed into the third reaction flocculating tank, the sodium hydroxide is fed according to the PH value of the water quality, effluent enters a pressurized floating tank for the air flotation and deoiling treatment again and the purified water flows into the treatment tank. The oily wastewater treatment device and the oily wastewater treatment method in the steel industry are applied to recycling the oily wastewater in the field of the oily wastewater produced in the steel production industry, and have a remarkable effect on saving water resources.

Description

technical field [0001] The invention relates to an oily wastewater treatment device and a process method thereof, in particular to a device and a process method for treating oily wastewater from various sources produced in the iron and steel industry during its production process. Background technique [0002] At present, oily wastewater is defined as wastewater containing oily pollutants. Especially in the production process of steel, various types of oily wastewater will be produced in large quantities. These wastewaters mainly come from blooming, hot rolling, continuous casting, machine repair and underground oil depots. And other process flow. Oil pollutants usually exist in three states in wastewater: [0003] (1) Floating oil, the particle size of oil droplets is greater than 100 μm, which is easy to separate from wastewater. [0004] (2) Dispersed oil. The particle size of oil droplets is between 10-100μm, suspended in water. [0005] (3) Emulsified oil, the partic...

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Problems solved by technology

[0013] In order to solve the problem that the oily wastewater treatment method in the prior art cannot cope with the large quantities of oily wastewater produced in the iron and steel production industry, the composition is unstable, and the source is intermittent, the present invention provides an oily wastewater treatment device for the iron and steel industry and its treatment method, which overcomes the inadequacy of the various oily wastewater treatment methods existing in the current prior art that cannot treat large quantities, high concentrations, and intermittent sources of oily wastewater, and can treat oily wastewater from iron and steel production enterprises Treat and recycle most of the treated wastewater as reused water to reduce environmental pollution

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