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Processing mthod of white water from paper making

A papermaking white water and treatment method technology, which is applied in the direction of papermaking, wastewater treatment in processing, multi-stage water/sewage treatment, etc., can solve the problems that air flotation technology is difficult to achieve, shallow air flotation treatment process is difficult to apply, etc., and achieve pollution resistance Strong ability, good hydrophilicity, and the effect of reducing white water turbidity

Inactive Publication Date: 2009-02-11
BAODING BANKNOTE PAPER CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For white water with low concentration and high turbidity, such as SS at about 100mg / L and banknote paper with turbidity as high as 1000NTU, the current shallow air flotation treatment process is difficult to apply
On the other hand, some high-grade papermaking systems require the SS of recycled white water (primary reuse) to be lower than 20mg / L, which is difficult to achieve simply by introducing the current air flotation technology.

Method used

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  • Processing mthod of white water from paper making
  • Processing mthod of white water from paper making
  • Processing mthod of white water from paper making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The treated white water comes from the secondary recycled white water of a banknote paper mill.

[0034] 1. Treated water volume and water quality

[0035] ①Treated water volume: 3000m 3 / d;

[0036] ②Influent water quality: SS40~150mg / L, COD50~200mg / L, pH value around 7.0, turbidity 200~1000NTU.

[0037] 2. Main equipment configuration and process parameters

[0038] ①First and second mixer: φ300mm, length 500mm;

[0039] ② Shallow air flotation water purifier: CQJ-6 type (Wuxi Jiangchuan Engineering Complete Equipment Co., Ltd.), φ6m;

[0040] ③ Clean water pump: 150FR-35 type, power 30KW, head 35m, maximum flow 200m 3 / h;

[0041] ④White water pump: 100WD type, power 15KW, head 15m, maximum flow 140m 3 / h;

[0042] ⑤ Dissolved air water return pump: IS80-50-250A type, power 18.5KW / 22KW, head 64.5m / 80m, maximum flow 45m 3 / h;

[0043] ⑥ Cationic PAM dispensing device: power 2.2KW, speed 1420r / min, transmission ratio 1:11, PAM from Mitsubishi, Japan, molecula...

Embodiment 2

[0054] The air flotation effluent that embodiment 1 obtains is implemented advanced treatment:

[0055] 1. Capacity: 25m 3 / d.

[0056] 2. Main equipment

[0057] ①Water storage tank (circulating storage tank)∮600mm*1000mm;

[0058] ②Circulation pump (stainless steel centrifugal pump), Q60~260L / min;

[0059] ③Ultrafiltration membrane module: PS-PEK hollow fiber ultrafiltration membrane with single skin structure, packing area 4m 2 , the membrane pore size is 0.01-0.1 μm, that is, the molecular weight of the intercepted substance is 60000-70000;

[0060] ④ One set of control system and one set of water inlet and outlet rotameters.

[0061] 3. Process

[0062] The effluent treated by air flotation (such as the effluent of Example 1) passes through the filtrate after the rotary filter device, with a certain speed and pressure (inlet pressure 0.13 ~ 0.15Mpa, outlet pressure is 0.10 ~ 0.12Mpa) from the ultrafiltration membrane One end of the separator enters, and water and sma...

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Abstract

The invention relates to a treatment method for paper-making white water, which comprises: treating residual white water with superficial air-float technique and with polyaluminium chloride and strong-cation polyacrylamide as flocculant and coagulant by special proportion to make SS of out water about 10mg / L and turbidity not larger than 15NTU and become primary recycling water, ultrafiltrating to remove all SS with turbidity not larger than 1NTU, and obtaining super recycling water. This invention can realize zero-discharge of paper-making white water in deed.

Description

technical field [0001] The invention relates to the white water treatment and reuse technology in the field of papermaking, in particular to the resource utilization technology of the remaining white water in the papermaking system with high-grade paper and special paper as products, so as to realize the maximum utilization of white water and improve the white water reuse rate. Background technique [0002] The water resource crisis has become one of the global focal issues. Water is the main carrier of paper production. In paper production, the demand for clean water and the large amount of wastewater discharge will be affected by factors including economic and environmental factors along with the shortage of water resources. Constraints in various aspects. It can be predicted that in the near future, water use will quickly become the "bottleneck" for the survival and development of papermaking enterprises, especially papermaking enterprises distributed in large and medium-...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/00C02F9/08C02F1/52C02F103/28
Inventor 李汉忠苏书智黄德喜
Owner BAODING BANKNOTE PAPER CO LTD
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