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Comprehensive utilization technology of viscose fiber acid wastewater

An acid waste water and viscose fiber technology, applied in multi-stage water treatment, alkali metal compounds, water/sewage treatment, etc., can solve the problems of substandard biochemical effluent, incomplete reaction, inappropriate dosage, etc. The effect of waste, comprehensive utilization, and cost reduction

Active Publication Date: 2016-11-23
SHANGHAI KAIXIN ISOLATION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the narrow optimum pH value of zinc ion precipitation, incomplete reaction during lime milk dosing, or inappropriate dosage, can lead to incomplete zinc ion precipitation, resulting in substandard biochemical effluent
At the same time, this process brings a large amount of zinc-containing solid waste that is difficult to handle, and causes a large amount of waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The acid wastewater at 90-95 degrees Celsius is composed of: sulfuric acid 10-20g / L, sodium sulfate 40-60g / L, zinc sulfate 1-2g / L, and the rest are organic matter and sulfide. After the water is placed in the storage tank for several hours, it is pumped into the heat exchange system. The temperature of the acidic wastewater is reduced to 40 degrees Celsius, and then it is pretreated. After ultrafiltration, the suspended matter is completely removed. The filtrate is clear and transparent, and the filtrate enters the reverse osmosis system. . After being treated by the primary reverse osmosis system, the operating pressure is ≤4Mpa, the temperature is ≤40 degrees Celsius, the total TDS in the membrane concentrate reaches 8-10%, and the membrane concentrate enters the secondary reverse osmosis system. Two-stage reverse osmosis, operating pressure ≤ 10MPa, concentrated until the total TDS reaches 10-18%. After being concentrated by a multi-effect evaporator equipped with a...

Embodiment 2

[0036] 10M 3 Acidic wastewater is 90-95 degrees Celsius, and its TDS is 4%. Put it in the tank to stay, the temperature of the water is lowered to 40 degrees Celsius through the plate heat exchanger, and enter the hollow fiber ultra / microfiltration system through the pump, and the filtrate is placed in the tank. The hollow fiber membrane ultra / microfiltration system adopts a membrane pore size of 0.1 micron. The system adopts a constant flow design. As the filtration progresses, the transmembrane pressure difference of the system gradually increases. After reaching the set pressure difference, the system will automatically backwash. The ultrafiltration water recovery rate reaches 98%. The ultrafiltration filtrate enters the reverse osmosis system.

[0037] The filtrate after microfiltration is pumped from the tank into the reverse osmosis system, the operating pressure is from 3 to 10MPa, and as the concentration progresses, the concentration at the end of the concentrate ...

Embodiment 3

[0041] 10M 3 Acidic wastewater is 90-95 degrees Celsius, and its TDS is 8%. Put it in the tank to stay, and enter the ceramic ultra / microfiltration system through the pump, and the filtrate is placed in the tank. The ceramic membrane ultra / microfiltration system adopts a membrane pore size of 0.1 micron. The system adopts a constant flow design. As the filtration progresses, the transmembrane pressure difference of the system gradually increases. The ultrafiltration water recovery rate reaches 98%. The ultrafiltration filtrate passes through the plate heat exchanger to reduce the water temperature to 40 degrees Celsius, and directly enters the dish reverse osmosis system. The operating pressure is 4MPa to 10MPa. As the concentration of the concentrate increases, the pressure gradually increases. The TDS in the concentrate reaches 20% from 8%. The concentrated solution enters the evaporation crystallization system to concentrate and crystallize. The secondary reverse osm...

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Abstract

Comprehensive utilization technology of viscose fiber acid wastewater includes the steps: firstly, filtering the viscose fiber acid wastewater by a filter, removing suspended matters in the wastewater and treating filtered solution in a next step; secondly, leading the filtered solution into a reverse osmosis system to obtain membrane concentrated solution and membrane permeate liquid, directly reusing the membrane permeate liquid as process water and treating the membrane concentrated solution in a step C; finally, leading the membrane concentrated solution obtained by reverse osmosis treatment into a multi-effect evaporator for concentration, feeding the membrane concentrated solution into a crystallizing tank for crystallization to obtain sodium sulfate crystals. Crystallized mother liquid is sulfuric acid, contains sodium sulfate and zinc sulfate and can be directly reused in a coagulating bath. By membrane combination technology, the sulfuric acid, the zinc sulfate, the sodium sulfate and the water are recycled, the problems of zinc discharge and solid waste are solved, and resources are comprehensively utilized.

Description

technical field [0001] The invention relates to the treatment of three wastes, in particular to a comprehensive utilization process of viscose fiber acidic waste water. Background technique [0002] Viscose fiber is regenerated cellulose fiber made from natural fiber. A large amount of waste water is generated in the production process of viscose fiber. These wastewaters mainly contain sulfuric acid, zinc sulfate, sodium sulfate, carbon disulfide, hydrogen sulfide, dissolved organic matter, suspended solids, etc., which are one of the main pollution sources of the textile industry and bring great harm to the environment. [0003] Acid wastewater is mainly produced in the spinning workshop, acid station and post-treatment process. Including washing spinning machine water, acid station washing filter drainage, silk washing water and post-treatment pickling water. In addition, cleaning evaporation equipment and crystallization equipment also produces a certain amount of acid...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01D5/00
CPCC01D5/00C02F1/001C02F1/048C02F1/441C02F1/444C02F9/00C02F2209/02C02F2209/03C02F2209/10C02F2301/08C02F2303/10C02F2303/14
Inventor 葛文越田灿彬刘峰张芸梁雄磊
Owner SHANGHAI KAIXIN ISOLATION TECH CO LTD
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