Method for improving biodegradability of papermaking wastewater by using combined process of coagulation and irradiation

A technology of papermaking wastewater and combined process, which is applied in the field of nuclear technology application and environmental protection, can solve the problems of high energy consumption and large radiation dose, and achieve the effects of reducing radiation dose, improving biodegradability, and improving economic efficiency

Inactive Publication Date: 2011-06-29
TSINGHUA UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for improving the biodegradability of papermaking wastewater by a combined coagulation-irradiation process, which solves the shortcomings of large radiation dose and high energy consumption for the degradation of organic pollutants in wastewater by radiation alone

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  • Method for improving biodegradability of papermaking wastewater by using combined process of coagulation and irradiation
  • Method for improving biodegradability of papermaking wastewater by using combined process of coagulation and irradiation
  • Method for improving biodegradability of papermaking wastewater by using combined process of coagulation and irradiation

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Embodiment 1

[0017] The papermaking wastewater comes from the wastewater before biochemical treatment in a sewage treatment plant of a papermaking company in Wuhan. The water quality of the wastewater is as follows: COD 722mg / L, BOD 5 427mg / L, DOC 173.6mg / L, pH 6.9. First, 300 mg of polyaluminium chloride was added to 1 liter of the waste water, and the supernatant was subjected to ionizing radiation treatment after coagulation and precipitation. 60 Co radiation device with a radioactivity of 481TBq. In the experiment, 20ml of papermaking wastewater was put into a 50ml radiation-resistant tube each time, and placed in a certain position in the irradiation field for irradiation. The irradiation time was 53-266min. Ferrous sulfate was used. The (Fricke) dosimeter measured the gamma dose rate at this position to be 9.4Gy / min. COD and BOD of papermaking wastewater by coagulation-irradiation combined process 5 see attached figure 1 .

Embodiment 2

[0019] The papermaking wastewater comes from the secondary biochemical effluent of a sewage treatment plant of a papermaking company in Wuhan. The water quality of the wastewater is as follows: COD 105mg / L, BOD 5 3.05mg / L, DOC 33.4mg / L, pH 7.3. First, 300 mg of polyaluminium chloride was added to 1 liter of the waste water, and the supernatant was subjected to ionizing radiation treatment after coagulation and precipitation. 60 Co radiation device with a radioactivity of 481TBq. In the experiment, 20ml of papermaking wastewater was put into a 50ml radiation-resistant tube each time, and placed in a certain position in the irradiation field for irradiation. The irradiation time was 53-266min. Ferrous sulfate was used. The (Fricke) dosimeter measured the gamma dose rate at this position to be 9.4Gy / min. COD and BOD of secondary biochemical effluent of papermaking wastewater by combined coagulation-irradiation process 5 see attached figure 2 .

Embodiment 3

[0021] The papermaking wastewater comes from the wastewater before biochemical treatment in a sewage treatment plant of a papermaking company in Wuhan. The water quality of the wastewater is as follows: COD 722mg / L, BOD 5 427mg / L, DOC 173.6mg / L, pH 6.9. First, 300 mg of polyaluminium chloride was added to 1 liter of the waste water. After coagulation and precipitation, the supernatant was treated with ionizing radiation. The radiation source was a Dynamitron electron accelerator of 0.5 MeV and 40 mA, and the dose rate of the electron beam was 21.2 kGy / min. In the experiment, 20ml of papermaking wastewater was put into a 50ml radiation-resistant tube each time, and placed in a certain position in the irradiation field for irradiation. The irradiation time was 1.41-7S. COD and BOD of papermaking wastewater by combined coagulation-irradiation process 5 The impact and embodiment 1 change little.

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Abstract

The invention discloses a method for improving the biodegradability of papermaking wastewater by using a combined process of coagulation and irradiation in the field of nuclear technology application and environment protection. The method comprises the following steps: the papermaking wastewater is treated by adopting a method combining coagulation and ionizing radiation; and firstly, most organic matters with cutoff molecular weights above 3000 kDa in the papermaking wastewater are removed by utilizing a coagulation and sedimentation process, and then toxic and difficultly biodegraded matters in the waste water, such as residual lignin, cellulose, aromatic compounds, and the like, are transformed to non-toxic/low-toxic and easily biodegraded matters through ionizing radiation, thereby improving the biodegradability of the papermaking wastewater. By adopting the combined process of coagulation and irradiation, difficultly biodegraded organic matters can be removed, and the radiation dose can be reduced to the maximum extent, thereby improving the economical efficiency of ionizing radiation treatment of the papermaking wastewater.

Description

technical field [0001] The invention belongs to the field of nuclear technology application and environmental protection, and in particular relates to a method for improving the biodegradability of papermaking wastewater by a combined coagulation-irradiation process. Background technique [0002] Waste paper papermaking uses waste board paper, waste newspapers, waste books and periodical paper as the main raw materials, and the waste paper recycling papermaking process can be divided into two parts: pulping and papermaking. A large amount of washing wastewater is generated in the process of slag removal, pulp washing and rinsing in the pulping part. The wastewater mainly contains lignin, cellulose, inorganic salts, fine fibers, inorganic fillers, inks, dyes and other pollutants. According to the source of waste paper and the difference in production process, the characteristics of washing wastewater are different, and its pollutant content is roughly: COD 500-2000mg / L, BOD ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F103/28
Inventor 何仕均王建龙
Owner TSINGHUA UNIV
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