Method for comprehensive wastewater desalination and zero release in steel production

A technology that integrates waste water and steel, and is applied in the fields of metallurgical waste water treatment, general water supply conservation, chemical instruments and methods, etc. It can solve the problems of large sewage discharge and high new water consumption, and achieve low operating costs, long equipment life and good effect. Effect

Active Publication Date: 2011-04-27
BEIJING SHOUGANG CO LTD
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Problems solved by technology

[0005] The purpose of the present invention is to provide a comprehensive wastewater desalination and zero-discharge method in iron a

Method used

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

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Embodiment Construction

[0010] Attached below figure 1 Specific embodiments of the present invention will be described.

[0011] Such as figure 1 Shown: Iron and steel comprehensive wastewater passes through the grid, after degreasing, it goes through the lime softening flocculation sedimentation system, the supernatant water is neutralized, sand filtered, chlorinated, multi-media filtered, microfiltration system, security filter, primary reverse osmosis system, The first-stage reverse osmosis concentrated brine passes through the lime sodium carbonate softening system, security filter, second-stage reverse osmosis system, and second-stage reverse osmosis concentrated brine to the steelmaking plant for stewing slag, achieving zero discharge. The first-stage reverse osmosis desalted water and the second-stage reverse osmosis desalted water are sent back to the steel production process for use. The technical parameters in the process are as follows:

[0012] The wastewater passes through the grille ...

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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...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/16
CPCY02A20/131
Inventor 雷仲存赵久梁朱伟明李双全寇彦德段小冰
Owner BEIJING SHOUGANG CO LTD
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