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Method for treating acid wastewater from viscose plant

An acid waste water and viscose fiber technology, which is applied in filtration treatment, sedimentation treatment, multi-stage water treatment, etc., can solve the problems of being unsuitable for the treatment of high-concentrated salt waste water, large investment in evaporation system, and high operating costs, so as to reduce sewage Processing costs and production costs, saving equipment investment and operating costs, and realizing the effect of resource recycling

Active Publication Date: 2017-12-22
唐山三友集团兴达化纤有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some viscose enterprises have adopted the evaporation method to concentrate and reuse acidic wastewater. The evaporation system has the disadvantages of large investment and high operating costs. High cost and high energy consumption have become the biggest constraint on the development of acidic water concentration and reuse process
At present, membrane filtration concentration technology has been widely used in the field of treatment of saline wastewater due to its advantages of low energy consumption and high efficiency, but this technology is not suitable for the treatment of high-concentration saline wastewater

Method used

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  • Method for treating acid wastewater from viscose plant
  • Method for treating acid wastewater from viscose plant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 200m at 85°C 3 / h acidic waste water (tested, containing 5g / L sulfuric acid, 15g / L sodium sulfate, 0.3g / L zinc sulfate, turbidity 50ntu) is concentrated in the collection tank with agitator, keep constant temperature at 85°C, and stir for 3 hours. The colloids and other impurities dissolved in the acidic wastewater will continue to collide with the agitation and agglomerate into large particles. After stopping the agitation and settling naturally for 2 hours, the large colloidal particles formed will be precipitated and deposited at the bottom of the collection tank with the action of gravity. According to the discharge temperature and heat exchange requirements, the acidic wastewater is divided into two parts in proportion for cooling treatment. The high-temperature acidic wastewater accounting for 75% of the total discharge is cooled to 30°C by means of multi-stage vacuum flashing. The vacuum flashing system produces 5.6t The secondary steam of more than 60°C / h enters...

Embodiment 2

[0043] 200m at 85°C 3 / h acidic waste water (tested, containing 5g / L sulfuric acid, 15g / L sodium sulfate, 0.3g / L zinc sulfate, turbidity 50ntu) is concentrated in the collection tank with agitator, keep the constant temperature at 85°C, and stir for 2.5 hours. The colloids and other impurities dissolved in the acid wastewater will continue to collide with the agitation and agglomerate into large particles. After stopping the agitation and settling naturally for 1.5 hours, the large colloid particles formed will precipitate and deposit at the bottom of the collection tank with the action of gravity. According to the discharge temperature and heat exchange requirements, the acidic wastewater is divided into two parts in proportion for cooling treatment. The high-temperature acidic wastewater accounting for 80% of the total discharge is cooled to 30°C by means of multi-stage vacuum flashing. The vacuum flashing system produces 5.6t The secondary steam of more than 60°C / h enters t...

Embodiment 3

[0047] 200m at 90°C 3 / h acidic waste water (tested, containing 10g / L sulfuric acid, 30g / L sodium sulfate, 0.8g / L zinc sulfate, turbidity 40ntu) is concentrated in the collection tank with agitator, keep the constant temperature at 88°C, and stir for 2 hours. The colloids and other impurities dissolved in the acid wastewater will continue to collide with the agitation and agglomerate into large particles. After stopping the agitation and settling naturally for 1.5 hours, the large colloid particles formed will precipitate and deposit at the bottom of the collection tank with the action of gravity. According to the discharge temperature and heat exchange requirements, the acidic wastewater is divided into two parts in proportion for cooling treatment. The high-temperature acidic wastewater accounting for 52% of the total discharge is cooled to 30°C by means of multi-stage vacuum flashing. The vacuum flashing system produces 4.6t The secondary steam of more than 60°C / h enters th...

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Abstract

The invention relates to a method for treating acid wastewater from a viscose plant. The method comprises the following steps: pretreating acid wastewater; treating the pretreated acid wastewater by using a membrane filtering concentration system, performing filtration concentration on the acid wastewater, and recycling filtrate to a viscose production system; performing further evaporation concentration through an evaporation system on an acid wastewater concentrated solution separated by using the membrane filtering concentration system, and recycling a final concentrated solution and generated condensed water into the viscose production system. By adopting the method, acid wastewater discharged from the viscose plant is treated for water circulation, and sulfuric acid and sulfate in viscose can be recycled. The salt content of water discharged from the viscose plant can be reduced, and the sewage treatment cost and the production cost can be reduced.

Description

technical field [0001] The invention relates to a method for treating acidic waste water from a viscose fiber factory, which belongs to the field of viscose fiber production, in particular to the field of treatment of viscose fiber acidic waste water. Background technique [0002] The acidic wastewater discharged from the spinning workshop of the viscose fiber factory contains sulfuric acid, sodium sulfate, and zinc sulfate. The current treatment method is: the acidic wastewater is discharged to the sewage treatment plant and mixed with other sewage for unified treatment. The discharge of a large amount of salty wastewater not only affects The biochemical treatment effect of subsequent wastewater also wastes energy. Research on changing the acidic water treatment process and recycling sulfuric acid, sodium sulfate and zinc sulfate in acidic water can not only reduce the acid and salt content in the external drainage, reduce the difficulty of biochemical treatment, and reduce...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/10
CPCC02F1/001C02F1/048C02F1/441C02F1/444C02F1/4693C02F9/00C02F2001/007C02F2101/101C02F2103/36C02F2301/08
Inventor 郑柏山刘勇么志高于捍江张东斌张浩红苏宝东庞艳丽郑东义朱明光李燕青冯林波张英杰高翔郑军峰崔海燕李学苗章建玲周洪发李耀华张宏伟
Owner 唐山三友集团兴达化纤有限公司
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