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Method and device for using small-aperture spiral wound ultrafiltration membranes to treat papermaking wastewater

A small pore size, ultrafiltration membrane technology, applied in chemical instruments and methods, processing wastewater treatment, water/sewage multi-stage treatment, etc., can solve problems such as environmental pollution, achieve excellent and stable water quality, and reduce the effect of membrane pollution pressure

Inactive Publication Date: 2012-06-27
北京清大国华膜科技有限公司
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct discharge will cause environmental pollution

Method used

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  • Method and device for using small-aperture spiral wound ultrafiltration membranes to treat papermaking wastewater
  • Method and device for using small-aperture spiral wound ultrafiltration membranes to treat papermaking wastewater

Examples

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Effect test

example 1

[0026] Example 1: The source of sewage is wastewater from a certain tobacco production, and the water quality condition is: COD Cr Content 2000-4500mg·L -1 , SS is 1200mg·L -1 , the turbidity is 248NTU, the chromaticity is 300 (dilution times). After the main process of coagulation and high-efficiency air flotation-small pore ultrafiltration, the molecular weight cut-off of the small pore scroll ultrafiltration membrane is 3000Da, the final effluent turbidity is ≤3 NTU, the chromaticity is ≤30, SS is not detected, and there is no SS after long-term storage. Odor, reaching the first-class standard of industrial reuse water, and the permeate is used for production recycling;

example 2

[0027] Example 2: The source of sewage is wastewater from a certain tobacco production, and the water quality condition is: COD Cr Content 3000-5000mg·L -1 , SS is 1680mg·L -1 , the turbidity is 263NTU, the color is 350 (dilution times). After the main process of coagulation and high-efficiency air flotation-small pore ultrafiltration, the molecular weight cut-off of the small pore scroll ultrafiltration membrane is 10000Da, the final effluent turbidity is ≤3 NTU, the chromaticity is ≤30, SS is not detected, and there is no SS after long-term storage. Odor, reaching the first-class standard of industrial reuse water, and the permeate is used for production recycling;

example 3

[0028] Example 3: The source of sewage is wastewater from a papermaking production, and the water quality conditions are: COD Cr Content 5000-15000mg·L -1 , SS is 786mg·L -1 , the turbidity is 165NTU, and the chromaticity is 200 (dilution times). After the main process of coagulation and high-efficiency air flotation-small pore ultrafiltration, the molecular weight cut-off of the small pore scroll ultrafiltration membrane is 6000Da, the final effluent turbidity is ≤3 NTU, the chromaticity is ≤30, SS is not detected, and there is no SS after long-term storage. Odor, meet the first-class standard of industrial reuse water, and the permeate is used for production recycling.

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Abstract

The invention discloses a method and a device for using small-aperture spiral wound ultrafiltration membranes to treat papermaking wastewater. The main process includes coagulation efficient air floatation and small-aperture ultrafiltration system which comprises a water collection tank (1), an efficient air floating system (2), a small-aperture ultrafiltration system (3), a water recycling tank (4) and a concentrated water tank (5). The efficient air floating system comprises a coagulation portion and an air floatation portion. The method and the device for using small-aperture spiral wound ultrafiltration membranes to treat papermaking wastewater has the advantages that most CODCr (chemical oxygen demand), suspended matters and fibers can be removed by means of the coagulation efficient air floatation, the small-aperture spiral wound ultrafiltration membrane system using a linear water inlet runner net can effectively control membrane contamination, and the membrane molecular weight cutoff is 3000-10000Da. Quality of discharged water of the whole system is high and stable, turbidity of the discharged water is smaller than or equal to 3NTU (number of transfer units), the suspended matters can be removed completely, the discharged water is odorless in long-time standing, concentrated solution can be used as slurry to be reused after further treatment, and permeate liquid can be directly used as production circulating water for reuse. The method and the device for using small-aperture spiral wound ultrafiltration membranes to treat papermaking wastewater are used for treatment and recycling of papermaking wastewater, and worthy of wide popularization and application to the market.

Description

technical field [0001] The invention belongs to the technical field of water treatment equipment, and relates to a method and a device for treating papermaking wastewater with a small-aperture roll-type ultrafiltration membrane. Background technique [0002] Papermaking wastewater mainly comes from the papermaking process of pulp and paper and the production process of papermaking tobacco flakes. [0003] The wastewater in the papermaking section of pulping and papermaking is called white water, which comes from the papermaking process in the papermaking workshop. White water mainly contains fine fibers, fillers, paints and dissolved wood components, as well as added rubber, wet strength agents, preservatives, etc., mainly insoluble COD, with low biodegradability, and the added preservatives have certain toxicity. The white water has a large amount of water, but its organic pollution load is far lower than that of the cooking black liquor and middle wastewater. The treatm...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/28
Inventor 陈福泰杜接弟郝福锦
Owner 北京清大国华膜科技有限公司
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