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Papermaking sewage closed circulation method and device

A closed-loop, wastewater technology, applied in chemical instruments and methods, processing wastewater treatment, water/sewage multi-stage treatment, etc., can solve problems such as poor recycling of lightweight fibers, rotten and odorous fillers, and increased recycling costs. , to reduce the pressure of membrane pollution, not easy to corrupt, and improve the water reuse rate.

Inactive Publication Date: 2014-04-16
北京清大国华膜科技有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the air flotation method is used, because the heavy fibers and fillers in the water are not easy to float up, it is easy to cause fibers to accumulate at the bottom of the air flotation tank, and the fillers will rot and become smelly, so the tank needs to be cleaned frequently; while the flocculation and sedimentation method is not good for the recovery of light fibers in the water, it needs to be recovered. Increase the dosage and increase the recovery cost

Method used

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  • Papermaking sewage closed circulation method and device

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example 1

[0029] Example 1: The source of sewage is concentrated white water from a paper mill, and the water quality condition is: COD Cr Content 300-600mg / L, SS 500-1200 mg / L. After the main process of papermaking wastewater closed-circuit circulation, the molecular weight cut-off of the small-pore scroll ultrafiltration membrane is 5000Da, and the final turbidity of the effluent is ≤3 NTU, SS is not detected, and COD Cr It is 50-100 mg / L, no peculiar smell after long-term storage, and reaches the first-class standard of industrial reuse water, and the permeate is used for production recycling.

example 2

[0030] Example 2: The source of sewage is white water from a paper mill in Shandong. The water quality conditions are: pH 6.5-6.8, turbidity 110-150NTU, SS 160-190 mg / L, COD Cr The content is 500-600 mg / L. After the main process of papermaking wastewater closed-circuit circulation, the molecular weight cut-off of the small-pore scroll ultrafiltration membrane is 3000Da, the final effluent turbidity is ≤1 NTU, SS is not detected, the COD content is 80-100 mg / L, and there is no peculiar smell after long-term storage , reaching the first-class standard of industrial reuse water, and the permeate is used for production recycling; the fibers in the white water can be burned after recycling and drying, realizing the reuse of water resources and the secondary utilization of waste.

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Abstract

The invention aims at providing a papermaking sewage closed circulation device. The papermaking sewage closed circulation device sequentially comprises a water collection tank (1), a sieve (2), a micro-eddy efficient clarification reactor (3), a security filter (4), a small aperture ultrafilitration system (5), a reuse water tank (6) and a plate-and-frame filter press (7). The quality of system outflowing water is high and stable, outflowing water turbidity is not greater than 3 NTU, suspended substances are completely removed, no peculiar smell is generated during long-term standing, and the quality of the finished paper product cannot be lowered after the reuse of the outflowing water, so that the resource utilization of closed circulation of the papermaking sewage and the fiber recovery is achieved. The method and device designed for papermaking sewage reuse treatment are worth being widely popularized and applied in the market and capable of deep treatment or reuse.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and relates to a method and a device for closed-circuit circulation of papermaking wastewater. Background technique [0002] Papermaking wastewater refers to the wastewater of the papermaking system, which mainly contains a large amount of suspended matter such as fine fibers, fillers, sizing agents, preservatives, reinforcing agents, etc., and also contains a lot of dissolved colloidal substances (DCS). Its dissolved COD and BOD indicators are relatively low, in the range of 300-800mg / L and 100-300mg / L, respectively, but the content of suspended matter is high, and the difference is also large, in the range of 500-3500mg / L. At present, a large amount of papermaking wastewater is also produced in the production process of tobacco flakes, and the discharge is very large. If it is discharged without treatment, it will not only pollute the environment, but also waste water resources. [000...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F1/44C02F103/28
Inventor 陈福泰杨艳
Owner 北京清大国华膜科技有限公司
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