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Device and method for treating pulping wastewater by Fenton catalytic oxidation method

A technology for catalytic oxidation and pulping wastewater, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of large amount of chemicals, sludge, high treatment cost, etc. Achieve the effects of improving efficiency, high treatment effect, and high mass transfer efficiency

Inactive Publication Date: 2014-12-31
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional Fenton catalytic oxidation technology has the problems of large amount of chemicals and high treatment costs, and a large amount of sludge is generated during the treatment process.

Method used

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  • Device and method for treating pulping wastewater by Fenton catalytic oxidation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] This example treats the wastewater from the southern miscellaneous wood pulp D0 / C-(EO)PD1 bleaching wastewater after hydrolytic acidification and activated sludge treatment, and the COD of the wastewater cr 350mg / L, BOD 5 It is 55mg / L, and the color is 490C.U.

[0049] The method for processing pulping wastewater by the Fenton catalytic oxidation process of the above-mentioned device comprises the following steps and process conditions:

[0050] 1) Balanced adjustment treatment: the wastewater in the sump 1 is transported to the balanced adjustment tank 7 at the top of the catalytic oxidation tower 6 through the first water pump 2, and H is added through the first pipeline mixer 3 and the second pipeline mixer 4 respectively. 2 SO 4 and FeSO 4 ·7H 2 O. Several partitions separated from each other are arranged in the balance adjustment tank 7, and the waste water passes through each partition successively in a push-flow manner, so that the waste water, H 2 SO 4 an...

Embodiment 2

[0059] This example is the same as Example 1 except for the following: a device for treating pulping wastewater by Fenton catalytic oxidation method is used to treat mixed wood pulp D0 / C-(EO)PD1 bleaching wastewater in the south by hydrolytic acidification and activated sludge process After the wastewater, the COD of the wastewater cr It is 310mg / L, and chromaticity is 530C.U.; In the present embodiment, by volume of waste water, FeSO 4 ·7H 2 The addition amount of O is 465 mg / L, the addition amount of hydrogen peroxide is 930 mg / L, and the addition amount of polyacrylamide is 1.8 mg / L. After treatment, the COD of wastewater cr It is 95mg / L, and the color is 100C.U. While adopting the conventional Fenton treatment method, the COD of the wastewater after treatment cr Between 120-150mg / L, the chromaticity is 120-170C.U., and the processing cost is relatively high.

Embodiment 3

[0061] This example is the same as Example 1 except for the following: a device for treating pulping wastewater by Fenton catalytic oxidation method is used to treat the wastewater produced by reconstituted tobacco leaves by papermaking method of a certain tobacco sheet enterprise, and the wastewater treated by UASB and SBR, the COD of wastewater cr It is 550mg / L, and chromaticity is 1900C.U.; In the present embodiment, by volume of waste water, FeSO 4 ·7H2 The addition amount of O is 1100 mg / L, the addition amount of hydrogen peroxide is 825 mg / L, and the addition amount of polyacrylamide is 2.0 mg / L. After treatment, the COD of wastewater cr It is 180mg / L, and the color is 280C.U. While adopting the conventional Fenton treatment method, the COD of the wastewater after treatment cr Between 230-260mg / L, the chromaticity is 400-480C.U., and the processing cost is relatively high.

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Abstract

The invention discloses a device and method for treating pulping wastewater by a Fenton catalytic oxidation method. The device comprises a water collecting tank, a catalytic oxidation tower, a neutralization tank, a coagulative precipitation tower, a clean water tank and a medicament preparation system, wherein a balance regulating tank at the top of the catalytic oxidation tower is connected with the water collecting tank through a pipeline; the balance regulating tank is connected with a water distribution pipe at the bottom of a fluidized catalytic reaction column of the catalytic oxidation tower through a pipeline; a circulating water outlet tank is connected with the water distribution pipe through a pipeline; the neutralization tank is connected with a water distribution pipe of the coagulative precipitation tower through a pipeline; an outlet water tank is arranged on the external wall of the upper part of the coagulative precipitation tower, and the top of the coagulative precipitation tower is connected with the outlet water tank through an overflow port. The method comprises the steps of carrying out balance regulating treatment, carrying out fluidized catalytic oxidation treatment, carrying out coagulative precipitation and purifying. According to the device and the method, by using efficient mass transfer efficiency under fluidized conditions, a relatively high wastewater treatment effect is achieved under the condition that the dosage of hydrogen peroxide and ferrous ions is relatively low, so that the wastewater treatment efficiency is increased, and meanwhile, the amount of generated sludge is reduced.

Description

technical field [0001] The invention relates to a method for treating pulping and papermaking wastewater, in particular to a device and method for treating pulping wastewater by a Fenton catalytic oxidation method. Background technique [0002] The pulp and paper industry is one of the important sources of wastewater and pollutant discharge. At present, a combination of primary physical and chemical treatment and secondary biological treatment is generally used to treat pulp and paper wastewater, which effectively reduces the pollution load of wastewater. However, pulping wastewater contains a certain concentration of non-biodegradable organic matter, which inhibits the effect of biological treatment, resulting in that the waste water cannot meet the national discharge standard after secondary biological treatment, and still contains a relatively high concentration of organic matter, so further treatment must be carried out. In-depth treatment to reduce the impact on the re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
Inventor 雷利荣陈赛艳李友明
Owner SOUTH CHINA UNIV OF TECH
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