Method for comprehensive wastewater desalination and zero pollution release in steel production

Abstract

The invention discloses a method for comprehensive wastewater desalination and zero release in steel production, belonging to the technical field of wastewater desalination and zero release. The method comprises the following steps of: introducing wastewater to a regulating pond through a fence, wherein the regulating pond is provided with a deoiling device; deoiling the wastewater; then introducing the wastewater into a lime softening flocculation precipitation system; enabling a supernatant to be subjected to neutralization, sand filtration, chlorination, multi-medium filtration and then introducing into a micro-filtration system, a cartridge filter and a primary reverse osmosis system; introducing primary reverse osmosis strong brine to a lime sodium carbonate softening system, the cartridge filter and a secondary reverse osmosis system; introducing secondary reverse osmosis strong brine for steelmaking and slag stewing so as to achieve zero release; and returning primary reverse osmosis demineralized water and secondary reverse osmosis demineralized water to the steel production process for application. The method has the advantages that a film is not blocked easily and the service life of equipment is long because the micro-filtration system, the primary reverse osmosis system, the resin softening system, the cartridge filter and the secondary reverse osmosis system are utilized. The primary reverse osmosis strong brine is introduced to the lime sodium carbonate softening system, the cartridge filter and the secondary reverse osmosis system; and the secondary reverse osmosis strong brine is introduced for steelmaking and slag stewing so as to achieve zero release of the wastewater.

Description

technical field [0001] The invention belongs to the technical field of waste water desalination and zero waste discharge, and in particular provides a comprehensive waste water desalination and zero waste discharge method in iron and steel production, which is suitable for reuse, desalination and zero waste discharge of waste water in the metallurgical industry. Background technique [0002] At present, when iron and steel wastewater is desalinated, recycled sewage is generally used. A. Preparation of reclaimed water: Take the sewer sewage from the metallurgical industry and undergo flocculation and sedimentation to meet the reclaimed water requirement that the suspended matter in the effluent is less than 100mg / l; B. Reclaimed water treatment: convert the above Reclaimed water is filtered through a fine grid, sterilized, and micro-flocculated to trap hair and remove some organic matter so that its COD is less than 30mg / l; C. Ultrafiltration treatment: the above-mentioned tre...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a comprehensive wastewater desalination and zero-discharge method in iron and steel production, which solves the problems of high fresh water consumption and large sewage discharge in iron and steel production

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