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Method for concentrating CMP (chemi-mechanical pulp) waste liquid by using membrane process

A treatment method and technology of chemical-mechanical pulp, which is applied in the field of membrane concentration treatment of chemical-mechanical pulp waste liquid, can solve the problems of high energy consumption for evaporation and concentration, membrane pollution, and difficulty in discharging chemical-mechanical pulp waste liquid up to the standard, and achieve energy consumption Reduced, good economic and social benefits

Active Publication Date: 2013-01-09
ZHEJIANG CREATION ENVIRONMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the existing problems in the existing technology, such as the difficulty in discharge of chemical-mechanical pulp waste liquid up to the standard, the defects of high energy consumption for evaporation and concentration, and the serious membrane pollution, the present invention provides a low investment cost, low operating cost, low energy consumption, and can obtain a large amount of water. Membrane concentration treatment method of chemical-mechanical pulp waste liquid that realizes chemical-mechanical pulp waste liquid pre-concentration by membrane method

Method used

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  • Method for concentrating CMP (chemi-mechanical pulp) waste liquid by using membrane process
  • Method for concentrating CMP (chemi-mechanical pulp) waste liquid by using membrane process

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Embodiment 1

[0024] Such as figure 1 As shown, it is a schematic diagram of the process flow of the membrane concentration treatment of chemical and mechanical pulp waste liquid according to the present invention, including: heat exchange cooling, microfiltration treatment, submerged ultrafiltration pretreatment and membrane preconcentration treatment.

[0025] Such as figure 2 As shown, it is a schematic diagram of a process flow device of a membrane concentration treatment method for chemical pulp waste liquid according to the present invention, including a raw water pool 1, a first booster pump 2, and a stainless steel spiral plate heat exchanger connected in sequence 3. Microfiltration device 17, submerged ultrafiltration membrane equipment 4, self-priming pump 5, backwash pump 6, intermediate pool 7, second booster pump 8, security filter 9, high-pressure pump 10, reverse osmosis or nanofiltration equipment 11. Flushing device 12, water production tank 13, concentrated water tank 14...

Embodiment 2

[0028] Process flow and apparatus schematic diagram are as embodiment 1.

[0029]The first booster pump 2 extracts the chemical-mechanical pulp waste liquid from the raw water pool 1, the extraction amount is 100 tons / hour, the pressure is 0.3MPa, and it enters the stainless steel spiral plate heat exchanger 3. At this time, the temperature of the chemical-mechanical pulp waste liquid is 48 °C, the mass percentage concentration is 2%, the waste liquid is cooled through the spiral plate heat exchanger 3, and the outlet water temperature after the heat exchanger treatment is 27 °C. Then enter the microfiltration equipment 17, the microfiltration filtration accuracy is 200 microns, and then enter the submerged ultrafiltration membrane equipment 4, and the submerged ultrafiltration membrane equipment 4 has 4 sets (one of them is spare), and each set of water production is 92 tons / hour , the submerged ultrafiltration equipment 4 has an operating pressure of minus 3 standard atmosph...

Embodiment 3

[0031] Process flow and device schematic diagram are as embodiment 1.

[0032] The first booster pump 2 extracts the chemical-mechanical pulp waste liquid from the raw water pool 1, the extraction amount is 100 tons / hour, the pressure is 0.3MPa, and enters the stainless steel spiral plate heat exchanger 3. At this time, the temperature of the chemical-mechanical pulp waste liquid is 45 °C, the mass percentage concentration is 1.5%, the waste liquid is cooled through the spiral plate heat exchanger 3, and the outlet water temperature after the heat exchanger treatment is 30 °C. Then enter the microfiltration equipment 17, the microfiltration filtration precision is 100 microns, and then enter the submerged ultrafiltration membrane equipment 4, and the submerged ultrafiltration membrane equipment 4 has 4 sets (one of them is spare), and each set of water production is 92 tons / hour , the operating pressure of the submerged ultrafiltration equipment 4 is minus 1 standard atmospher...

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Abstract

The invention relates to the field of industrial waste water treatment, particularly relates to and discloses a method for concentrating CMP (chemi-mechanical pulp) waste liquid by using a membrane process. The method comprises the following steps: (1) heat exchange for cooling; (2) microfiltration treatment; (3) ultrafiltration pretreatment; and (4) membrane preconcentration. In the CMP waste liquid treatment method provided by the invention, the CMP waste liquid with initial concentration by mass percentage of 1-2% is concentrated to 7-10% by a membrane concentration system, and penetrationliquid can be directly discharged or reused. Through adopting an immersed ultrafiltration and reverse-osmosis / nanofiltration preconcentration process and a series of membrane pollution control techniques, the smoothly continuous operation of the system can be ensured, thereby realizing the zero discharge of the CMP waste liquid. By using the method provided by the invention, the problem that the CMP waste liquid is treated to meet the States discharge standards can be completely solved; and compared with a direct evaporation and concentration mode, the method is characterized by adopting preconcentration of the membrane system, the energy consumption is greatly reduced, and a good deal of produced water can be recycled, therefore, the method provided by the invention has good economic andsocial benefits.

Description

technical field [0001] The invention relates to the field of industrial waste water treatment, in particular to a membrane concentration treatment method for chemical-mechanical pulp waste liquid. Background technique [0002] Compared with traditional chemical pulp wastewater, although the discharge volume and pollution load of chemical-mechanical pulp wastewater have been greatly reduced, due to its complex pollution components, including residual chemical agents and wood leaching substances, the COD and BOD5 concentrations of wastewater are relatively high. At present, the commonly used treatment methods mainly include aerobic, anaerobic biological treatment and direct evaporation. During the production process of chemical-mechanical pulp, due to chemical impregnation, more polyphenols are dissolved out, the color is also large, the content of toxic substances is high, and the biodegradability is poor. At the same time, wastewater may contain high sulfate ions, which has...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/02D21C11/00C02F1/44C02F103/28
CPCY02A20/131
Inventor 包进锋洪海云陈甘
Owner ZHEJIANG CREATION ENVIRONMENT TECH
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