Cold-rolling leveling waste liquid treatment method based on forward osmosis theory

Abstract

The invention discloses a cold-rolling leveling liquid treatment method based on the forward osmosis theory. The method comprises the following steps: 1, carrying out paper tape filtration on levelingwaste liquid, wherein filtration precision is 15 to 30 microns; 2, enabling the wastewater to enter a tubular microfiltration membrane at a flow rate of 20-30 m<3>/h, wherein the pore diameter of themicrofiltration membrane is 0.1 [mu]m, and performing filtering treatment until 95% or above of solid impurities in the waste liquid are removed and the content of SS is smaller than 10 mg/L; 3, introducing the waste liquid treated in the step 2 into a coalescence oil-water separator, wherein the coalescence oil-water separator is sequentially provided with a rectification area, a coalescence area and an oil-phase water-phase outlet separation area according to the flowing sequence of the waste liquid, the rectification area enables the liquid to be fully and evenly mixed, the coalescence area is filled with a coalescence medium, a base material of the coalescence medium is composite fibers formed by weaving polytetrafluoroethylene fibers and stainless steel wires in a mixed manner, a surface contact angle between the polytetrafluoroethylene fibers and water is 120-130 degrees, and a contact angle between the polytetrafluoroethylene fibers and oil is 45 degrees; and 4, concentrating the liquid separated from a water phase outlet in the step 3 through a forward osmosis membrane, and recycling the concentrated liquid to a production link.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a treatment method for cold-rolled leveling waste liquid based on the forward osmosis theory. Background technique [0002] The essence of leveling is cold rolling with a small pressure rate (0.3-3%), its function is to eliminate the yield platform, and there will be no stamping "slip line" for a long period of time after the strip is leveled; at the same time, the yield of the strip will be reduced. The limit reaches the minimum, so as to improve the formability of the plate shape; to improve the shape of the plate and the flatness of the strip; to make the strip steel have a certain roughness. This process largely determines the surface state, plate shape, mechanical properties and process properties of the product strip. [0003] Leveling is divided into two modes: dry leveling and wet leveling. Dry leveling without lubricant, characterized by the fact th...

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Problems solved by technology

However, traditional anaerobic biological treatment has problems such as long cultivation and acclimation time, sludge loss, and

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