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

A catalytic oxidation and chemical mechanical technology, applied in chemical instruments and methods, oxidized water/sewage treatment, processing wastewater treatment, etc., can solve the problems of high treatment cost, large content and large amount of sludge, and achieve rapid mixing. , the effect of reducing usage and reducing consumption

Active Publication Date: 2013-12-25
INST OF CHEM IND OF FOREST PROD CHINESE ACAD OF FORESTRY
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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

Method used

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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 samples from a chemical mechanical pulp mill

[0025]

[0026] A chemical mechanical pulp mill discharges 3000-5000m of chemical mechanical pulp wastewater per day 3 , COD4500~6000mg / L, pollution characteristics are shown in Table 1. go through figure 1 After the precipitation-anaerobic-aerobic engineering treatment shown, the COD of the aerobic effluent is reduced to about 500mg / L.

[0027] Direct use of aerobic treated effluent figure 2 The shown Fenton oxidation 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 pool II, add ferrous sulfate 0.40kg / m in the pool 3 ~0.80kg / m 3 . Then enter the reaction tank, add hydrogen peroxide 0.50kg / m in the reaction tank 3 ~0.70kg / m 3 . The flow rate of sulfuric acid enterin...

Embodiment 2

[0037] The waste water treatment site of a chemical mechanical pulp mill was upgraded, and a catalytic oxidation advanced treatment project was added. The process is as follows image 3 . Since July 2011, the government has implemented the new "Discharge Standards for Pulp and Paper Water Pollutants" (GB3544-2008), and conducted on-site monitoring of the advanced treatment project. The results are shown in Table 4. Judging from the one-month operation situation, the chemical mechanical pulp produced by the enterprise after aerobic treatment was 265-724 mg / L. After the advanced treatment of the catalytic oxidation project of the present invention, the COD of the total discharge outlet water was reduced to 31-87 mg / L (national standard heavy chromium Potassium acid method GB11914-89), or 36 ~ 89mg / L (on-line instrument monitoring), fully meet the national emission standards of COD ≤ 100mg / L.

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

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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 catalytic oxidation advanced treatment of high-concentration chemical-mechanical pulp wastewater. Background technique [0002] To produce pulp for papermaking from plant fiber raw materials, chemical treatment, mechanical treatment or a combination of the two methods are usually adopted. The pulping method combining chemical treatment and mechanical treatment is called chemical mechanical pulping. Chemimechanical pulping is considered to be a clean production process in the paper industry in the 21st century, and the prepared chemimechanical pulp also has unique physical and optical properties. Based on the technical advantages of chemical mechanical pulp, many large chemical mechanical pulp production lines and production plants have been built in my country. The production of chemical-mechanical chemical-mechanical pulp (chemical-mechanical pulp) has developed ra...

Claims

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Application Information

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Patent Type & Authority Patents(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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