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Method of preparing pure water using metallurgic sewage

A sewage and pure water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve problems such as water consumption, achieve low operating costs, reduce production costs, Good desalination effect

Inactive Publication Date: 2005-11-23
HEBEI IRON AND STEEL
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Problems solved by technology

In addition, there is a process of producing pure water by using the original pure water ion exchange method, which is only suitable for surface water and well water treatment with an ion content lower than 400mg / l
Obviously, the above-mentioned methods all need to use surface water or well water as the water source, and consume a lot of water resources.

Method used

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  • Method of preparing pure water using metallurgic sewage

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[0023] 1. Recycling metallurgical sewage and producing reclaimed water: Collect sewage from smelting and steel rolling workshops through the lifting pump station into the distribution pool, add polyaluminum chloride (PAC) and stir, fully mix polyaluminum chloride (PAC) and sewage Mixing, sedimentation and oil skimming to make the effluent meet the requirement of reclaimed water with suspended matter content <50mg / l.

[0024] 2. Reclaimed water treatment: pass the above reclaimed water through a 1mm fine grid to remove hair and other debris, and then adjust the dosage. In order to improve the removal rate of suspended solids, colloids, and organic matter in reclaimed water, a certain amount of flocculant should be added. The flocculant is polyaluminium chloride, and the dosage is 3-8mg / L. The removal rate of organic matter can reach 50-70%. In order to inhibit the reproduction of bacteria in the water, it is necessary to sterilize the reclaimed water. The bactericide uses sodiu...

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Abstract

The invention relates to a method of preparing pure water using metallurgic sewage which comprises the following steps, (1) reclaiming sewage water, preparing recycled water, wherein the water outlet suspended matter <100mg / l, (2) treating the recycled water, subjecting the recycled water to fine grid filtration, sterilizing, micro-flocculation, entrapping hairs, making the COD <30mg / l, (3) ultra-filtration treatment, passing the recycled water through external pressured immersion type ultra-filtration apparatus for treatment, meeting the requirement of SDI<2, (4) reverse osmosis desalination treatment, loading the ultrafiltrated water into reverse osmosis apparatus for desalinization treatment.

Description

technical field [0001] The invention relates to a water treatment method, in particular to a treatment and recycling method for industrial sewage in the metallurgical industry, and belongs to the technical field of wastewater treatment. Background technique [0002] Water is an important and precious resource. With the continuous and stable development of industry, the contradiction between supply and demand of water resources has become increasingly prominent. The metallurgical industry is a large water user. In the production process, on the one hand, there is a large amount of industrial sewage discharge, which pollutes the environment. On the other hand, it needs to consume a large amount of pure water (de-salted water). Therefore, the problems of environmental pollution and large water consumption are very prominent. . At present, the pure water production process used in the metallurgical industry is mostly pretreatment + reverse osmosis (RO) method. This method is a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
CPCY02A20/131
Inventor 孔平吴红梅李付俊张松建姚海宾
Owner HEBEI IRON AND STEEL
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