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Pulping and papermaking wastewater processing technology

A technology for pulping and papermaking and wastewater treatment, which is applied in the fields of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc. At the same time, it significantly improves the problems such as reducing the COD value and chromaticity, reducing the processing cost, and improving the processing capacity and buffering capacity.

Active Publication Date: 2012-07-11
SHANGHAI EMPEROR OF CLEANING HI TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome that the existing Fenton method for pulping and papermaking wastewater is expensive, which is not conducive to large-scale application, and the Fenton-like method for pulping and papermaking wastewater cannot simultaneously achieve COD removal rate and B / C ratio. At the same time, it significantly improves the defects of etc., and provides a pulping and papermaking wastewater treatment process with simple process steps, greatly reduced treatment costs, can effectively reduce COD value and chroma, and improve B / C ratio

Method used

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  • Pulping and papermaking wastewater processing technology

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Experimental program
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Effect test

Embodiment 1

[0033] The COD of pulping and papermaking wastewater is 1630.58mg / L, the chroma is 754.85mg / L, the B / C ratio is 0.28, and the color is yellowish brown.

[0034] Pulp and paper wastewater treatment process (see attached figure 1 ):

[0035] (1) Add concentrated sulfuric acid to the 1# adjustment tank of the pulping and papermaking wastewater to adjust the pH value to 3.0-4.0;

[0036] (2) Pour the acidified waste water into the SD multi-component reactor through a water pump to carry out iron-carbon reaction, the iron-carbon mass ratio is controlled to be 3:1, and the reaction time is 60min;

[0037] (3) The waste water after the iron-carbon reaction is discharged into the 2# regulator, and concentrated sulfuric acid is added to adjust the pH to 3.0 to 4.0 again;

[0038] (4) The acidified waste water is discharged into the Fenton reactor, and the H concentration of 1mL / L is added. 2 o 2 Carry out Fenton reaction, reaction time is 60min;

[0039] (5) The waste water after ...

Embodiment 2

[0045] The COD of pulping and papermaking wastewater is 1630.58mg / L, the chroma is 754.85mg / L, the B / C ratio is 0.28, and the color is yellowish brown.

[0046] Pulp and paper wastewater treatment process:

[0047] (1) Add concentrated sulfuric acid to the 1# adjustment tank of the pulping and papermaking wastewater to adjust the pH value to 3.0-4.0;

[0048] (2) Pour the acidified waste water into the SD multi-component reactor through the water pump to carry out the iron-carbon reaction, the iron-carbon mass ratio is controlled to be 2: 1, and the reaction time is 90min;

[0049] (3) The waste water after the iron-carbon reaction is discharged into the 2# regulator, and concentrated nitric acid is added to carry out the pH adjustment again to a pH value of 3.0 to 4.0;

[0050] (4) The waste water after acidifying again is discharged into the Fenton reactor, and the concentration of adding H is 6mL / L 2 o 2 , carry out Fenton reaction, reaction time is 60min;

[0051] (5) ...

Embodiment 3

[0057] The COD of pulping and papermaking wastewater is 1577.49mg / L, the chroma is 673.28mg / L, the B / C ratio is 0.28, and the color is yellowish brown.

[0058] Pulp and paper wastewater treatment process:

[0059] (1) Add concentrated sulfuric acid to the 1# adjustment tank of the pulping and papermaking wastewater to adjust the pH value to 3.0-4.0;

[0060] (2) Pour the acidified waste water into the SD multi-component reactor through a water pump to carry out iron-carbon reaction, the iron-carbon mass ratio is controlled to be 5:1, and the reaction time is 30min;

[0061] (3) The waste water after the iron-carbon reaction is discharged into the 2# regulator, and concentrated hydrochloric acid is added to carry out the pH adjustment again to a pH value of 3.0 to 4.0;

[0062] (4) The waste water after acidifying again is discharged in the Fenton reactor, and adding concentration is the H of 2mL / L 2 o 2 , carry out Fenton reaction, reaction time is 120min;

[0063] (5) Th...

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Abstract

The invention discloses a pulping and papermaking wastewater processing technology comprising the steps that: the pH value of the pulping and papermaking wastewater is regulated to 1.5-4, and the wastewater is subject to an iron-coke reaction; the pH value of the water discharged form the iron-coke reaction is regulated to 1.5-4, and the water is subject to a Fenton reaction; the pH value of the water is regulated to 7-10, and the water is subject to coagulative precipitation; the water is filtered, such that the processing is finished. The processing technology is advantaged in simple process. With the technology, the processing cost can be greatly reduced, COD and chromaticity can be effectively reduced, and a B / C ratio can be improved.

Description

technical field [0001] The invention relates to a pulping and papermaking wastewater treatment process. Background technique [0002] The paper industry is a traditional large water user and one of the important sources of water pollution. With the development of the economy, enterprises are increasingly facing problems such as shortage of water resources and shortage of raw materials. On the other hand, water pollution will also become more and more serious. At present, the discharge of waste water and COD in my country's paper industry ranks first in the discharge of various industries in my country, and the pollution of the water environment by the paper industry is the most serious. Pulping and papermaking wastewater mainly includes cooking waste liquor (also known as black liquor) produced by chemical pulping, intermediate water produced in the washing and bleaching process, and white water produced in the papermaking process, all of which have serious pollution to the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 王炜
Owner SHANGHAI EMPEROR OF CLEANING HI TECH
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