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Chlorine dioxide bleaching process for reducing content of organic chloride in waste water

A technology of chlorine dioxide and organic chlorine, which is applied in chemical instruments and methods, pulp bleaching, water/sewage treatment, etc., can solve the problem of high toxicity of wastewater, and achieve the effects of less addition, easy acquisition, and easy industrial implementation

Inactive Publication Date: 2011-04-13
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In order to further improve the bleaching efficiency, bioenzyme pretreatment chlorine dioxide bleaching, high-temperature chlorine dioxide bleaching and other technologies have been more in-depth and extensive research, but the current situation of high organic chlorine content in chlorine dioxide bleaching wastewater has not changed, and the toxicity of wastewater is still higher

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the 8.0% eucalyptus pulp by weight percentage concentration, the NaOH dosage is 0.04%, ClO 2 The dosage is 0.18%, and the dosage of sulfamic acid or dimethyl sulfoxide is 0.4% and 0.8% respectively. When bleaching eucalyptus pulp with chlorine dioxide, the bleaching temperature is controlled at 70°C to 80°C for 0.5h to 1.0h. Then carry out follow-up chlorine-free bleaching treatment, in the chelating treatment section, the amount of diethylenetriaminepentaacetic acid is 0.3%, the wood pulp concentration is 8% during treatment, the temperature is 65 ° C, and the time is 0.5 hour; in the hydrogen peroxide bleaching section, the hydrogen peroxide The amount of sodium is 0.3%, the amount of magnesium sulfate is 0.3%, the amount of sodium silicate is 0.2%, the amount of hydrogen peroxide is 0.3%, the wood pulp concentration is 8%, the temperature is 65 ° C, and the time is 1.0 hour.

Embodiment 2

[0018] In the 10.0% eucalyptus pulp in weight percent concentration, the NaOH dosage is 0.05%, ClO 2 The dosage is 0.20%, and the dosage of sulfamic acid or dimethyl sulfoxide is 0.6% and 1.0%, respectively. When bleaching eucalyptus pulp with chlorine dioxide, the bleaching temperature is controlled at 70°C to 80°C for 0.5h to 1.0h. Then carry out follow-up chlorine-free bleaching treatment. In the chelating treatment section, the amount of diethylenetriaminepentaacetic acid is 0.5%, the wood pulp concentration is 10% during treatment, the temperature is 70°C, and the time is 0.75 hours; in the hydrogen peroxide bleaching section, hydrogen oxidation The amount of sodium is 0.5%, the amount of magnesium sulfate is 0.5%, the amount of sodium silicate is 0.4%, the amount of hydrogen peroxide is 0.5%, the wood pulp concentration is 10%, the temperature is 70 ℃, and the time is 1.25 hours.

Embodiment 3

[0020] In the 12.0% eucalyptus pulp in weight percentage concentration, the NaOH consumption is 0.06%, ClO 2 The dosage is 0.22%, and the dosage of sulfamic acid or dimethyl sulfoxide is 0.8% and 1.2% respectively. When bleaching eucalyptus pulp with chlorine dioxide, the bleaching temperature is controlled at 70°C to 80°C for 0.5h to 1.0h. Then carry out follow-up chlorine-free bleaching treatment, in the chelation treatment section, the amount of diethylenetriaminepentaacetic acid is 0.7%, the wood pulp concentration is 12% during treatment, the temperature is 75 ° C, and the time is 1.0 hour; The amount of sodium is 0.7%, the amount of magnesium sulfate is 0.7%, the amount of sodium silicate is 0.6%, the amount of hydrogen peroxide is 0.7%, the wood pulp concentration is 12%, the temperature is 75 ° C, and the time is 1.5 hours.

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Abstract

The invention provides a chlorine dioxide bleach method for reducing the content of organic chlorine in effluent. The method is a technology of reducing the content of organic chlorine in element free chlorine (ECF) bleaching effluent and improving the performance of a bleaching pulp, belongs to the papermaking technical field and mainly comprises the following steps of: 1) adding aminosulfonic acid or DMSO addition agent under an appropriate chlorine dioxide bleach technique; 2) bleaching wood pulp and bleaching deoxidation sulfate wood pulp in the presence of NaOH, CIO2 and the addition agent; 3) conducting subsequent totally chlorine-free (TCF) wood pulp bleach and then conducting subsequent two-stage bleach ( a chelated treatment stage and a hydrogen bleach stage) treatment on the bleached wood pulp. The method is easy to operate, has obvious effect, can reduce the content of organic chlorine in DQP bleaching effluent and improve the performance criterions of DQP bleaching paper pulp such as whiteness and tensile index, etc.

Description

technical field [0001] The invention relates to a chlorine dioxide bleaching method for reducing the organic chlorine content of waste water, and is a novel technology for reducing the organic chlorine content of elemental chlorine-free (ECF) bleaching waste water and improving the performance of bleached pulp. Background technique [0002] Due to the requirements of environmental protection and the development of bleaching technology, chlorine dioxide, as a highly efficient and less polluting bleaching agent, has been widely used in the pulp bleaching industry. Compared with traditional chlorine and hypochlorite bleaching, chlorine dioxide bleaching has the advantages of good delignification selectivity and high pulp whiteness strength. [0003] In order to further improve the bleaching efficiency, bioenzyme pretreatment chlorine dioxide bleaching, high-temperature chlorine dioxide bleaching and other technologies have been more in-depth and extensive research, but the curr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C9/14C02F1/58
Inventor 周学飞袁敬宋强
Owner KUNMING UNIV OF SCI & TECH