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Method for advanced treatment of high-concentration chemi-mechanical pulp effluent by catalytic oxidation

A chemical-mechanical and catalytic oxidation technology, applied in chemical instruments and methods, oxidized water/sewage treatment, processing wastewater treatment, etc. volume, fast mixing, reduced consumption effect

Active Publication Date: 2012-09-12
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0007] In order to solve the problems in the prior art that the processing cost is high, the amount of sludge generated is large, and the sludge contains a large amount of harmful inorganic salts, the present invention provides a method for advanced treatment of high-concentration chemical-mechanical pulp wastewater by catalytic oxidation, and the processing cost Low, the amount of sludge generation is small

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  • Method for advanced treatment of high-concentration chemi-mechanical pulp effluent by catalytic oxidation
  • Method for advanced treatment of high-concentration chemi-mechanical pulp effluent by catalytic oxidation
  • Method for advanced treatment of high-concentration chemi-mechanical pulp effluent by catalytic oxidation

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Embodiment 1

[0024] Table 1 Pollution characteristics of wastewater from a chemical mechanical pulp mill

[0025]

[0026] A chemical mechanical pulp plant discharges 3000~5000m of chemical mechanical pulp wastewater daily 3 , COD4500~6000mg / L, pollution characteristics are shown in Table 1. after figure 1 After the precipitation-anaerobic-aerobic engineering treatment shown, the COD of the aerobic effluent drops to about 500mg / L.

[0027] Direct use for aerobic treatment effluent figure 2 The shown Fenton oxidation method treatment, the specific steps are the effluent after aerobic treatment of chemical mechanical pulp wastewater, enter the mixing tank I and add concentrated sulfuric acid 0.40kg / m 3 ~0.75kg / m 3 , To reduce the pH of wastewater. Then enter the mixing tank Ⅱ, add ferrous sulfate 0.40kg / m in the tank 3 ~0.80kg / m 3 . Then enter the reaction tank, add 0.50kg / m of hydrogen peroxide in the reaction tank 3 ~0.70kg / m 3 . The flow rate of sulfuric acid into the mixing tank I is contr...

Embodiment 2

[0037] The wastewater treatment site of a chemical mechanical pulp mill was upgraded and transformed, and the advanced catalytic oxidation treatment project was added. The process is as follows image 3 . After the government implemented the new "Pulp and Paper Water Pollutant Discharge Standard" (GB3544-2008) in July 2011, the advanced treatment project has been monitored on site. The results are shown in Table 4. Judging from the operation of one month, the effluent of this enterprise chemical mechanical pulp aerobic treatment is 265~724mg / L. After the advanced treatment of the catalytic oxidation project of the present invention, the total discharge outlet COD drops to 31~87mg / L (national standard dichromium It is determined by the potassium acid method GB11914-89), or 36~89mg / L (online instrument monitoring), which fully meets the national emission standard of COD≤100mg / L.

[0038] Table 5 shows the material consumption and cost of the catalytic oxidation advanced treatment ...

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Abstract

The invention discloses a method for advanced treatment of high-concentration chemi-mechanical pulp effluent by catalytic oxidation. For the chemi-mechanical pulp effluent, the method includes: firstly, treating the effluent by sedimentation, anaerobic process and aerobic process to remove most of organic pollutants in the effluent; secondly, using aluminum sulfate solution to coagulate the effluent; thirdly, using strong acid to further reduce pH value of the effluent; fourthly, adding reducing agent, namely ferrous sulfate, and mixing well; and fifthly, adding oxidant, namely hydrogen peroxide, and performing aeration to allow for air assisted catalytic oxidation so as to effectively decompose residual organic pollutants in the effluent. Calcium hydroxide emulsion is used to adjust the pH value, anionic polyacrylamide is used to assist in coagulation, and accordingly the effluent can be standardly emitted after passing through a clearing tank. Effluent about 500mg / L is emitted after aerobic treatment of the chemi-mechanical pulp. COD (chemical oxygen demand) of the effluent treated by the method is reduced to less than 90mg / L, and the removal rate of COD reaches more than 90%.

Description

Technical field [0001] The invention relates to a wastewater treatment method, in particular to a method for advanced treatment of high-concentration chemical mechanical pulp wastewater by catalytic oxidation. Background technique [0002] The production of pulp for papermaking from plant fiber raw materials usually adopts chemical treatment, mechanical treatment or a combination of both. The pulping method that combines chemical treatment and mechanical treatment is called chemical mechanical pulping. Chemical mechanical pulping is considered to be a clean production process in the paper industry in the 21st century. The chemical mechanical pulp produced also has unique physical and optical properties. Based on the technical advantages of chemical mechanical pulp, my country has built many large chemical mechanical pulp production lines and production plants. The production of chemical mechanical chemical mechanical pulp (chemical mechanical pulp) has developed rapidly. In jus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/52C02F1/56C02F1/66C02F1/72C02F103/28
Inventor 房桂干施英乔盘爱享丁来保邓拥军沈葵忠李萍焦健韩善明梁芳敏庄国俊
Owner INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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