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Zero discharge method of stainless steel cold rolling acidic waste water concentrated liquid

A technology for acid waste water and waste water concentration, which is applied in the field of water treatment, can solve the problems of zero discharge technology report of reverse osmosis concentrate of acid waste water from stainless steel cold rolling, etc., and achieve good social and environmental benefits.

Inactive Publication Date: 2014-09-24
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Check the existing patents and literature, there is no report on the technology of zero discharge of reverse osmosis concentrate for stainless steel cold rolling acid wastewater

Method used

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  • Zero discharge method of stainless steel cold rolling acidic waste water concentrated liquid

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Embodiment Construction

[0039] The present invention will be further described below in conjunction with the examples, and those skilled in the art should understand that the examples are only for illustration and do not constitute any limitation to the present invention.

[0040] (1) softening, coagulation and precipitation

[0041] The concentrated solution from the reverse osmosis system first enters the softening system, and sodium carbonate solution is added to the softening pool to control the pH at 9.5-10, and at the same time, coagulant (dosing amount 5-30ppm) and coagulant aid ( 0~3ppm), after coagulation and reaction, it enters the sedimentation tank for mud-water separation.

[0042] (2) pH adjustment

[0043] The pH of the effluent from the sedimentation tank is adjusted to 6-7 with hydrochloric acid.

[0044] (3) filter

[0045] After pH adjustment, it enters the filter for filtration. The filter material can be quartz sand, anthracite, or quartz sand for the lower part and anthracite...

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Abstract

The invention provides a zero discharge method of stainless steel cold rolling acidic waste water concentrated liquid, which orderly comprises the following steps: (1) softening, and coagulating sedimentation; (2) pH adjustment; (3) filtration; (4) membrane distillation, that is, heating the waste water concentrated liquid treated in step (3) to 55-75 DEG C, allowing the waste water concentrated liquid to enter a membrane distillation assembly, wherein the obtained condensed water can be recycled for production; (5) evaporative crystallization, that is, allowing the concentrated liquid discharged after membrane distillation treatment in step (4) to enter an evaporating crystallizer for evaporative crystallization to obtain crystal slurry, heating the crystal slurry in a heating chamber to 95-100 DEG C, allowing the heated crystal slurry to enter a crystallization chamber, boiling the crystal slurry to allow the solution to reach a saturation state, and discharging the generated crystals. The zero discharge method of the invention carries out membrane distillation and evaporative crystallization treatment of concentrated liquid generated by reverse osmosis desalination treatment of stainless steel cold rolling waste water, recycles obtained pure water for production, converts inorganic salt in the concentrated liquid into solids, realizes zero discharge of waste water, and has good social benefit and environment benefit.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for zero discharge of acidic waste water concentrate from stainless steel cold rolling. Background technique [0002] The iron and steel industry is a large consumer of water resources. Therefore, the implementation of wastewater reuse is an important measure for iron and steel enterprises to reduce the consumption of new water per ton of steel and the discharge of wastewater per ton of steel, and to implement the national energy-saving and emission-reduction policy. One of the characteristics of wastewater from the iron and steel industry is its high electrical conductivity, and most users have certain requirements for electrical conductivity. Coagulation, sedimentation, filtration, and biological and chemical treatments commonly used by iron and steel enterprises have basically no effect on the removal of soluble inorganic ions in water, and the tre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F103/16
CPCY02A20/131
Inventor 侯红娟刘勇尹婷婷李恩超曹跃华
Owner BAOSHAN IRON & STEEL CO LTD
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