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Zero-wastewater-emission pulping method

A zero-emission and waste water technology, applied in the field of paper pulping, can solve problems such as waste of water resources and environmental pollution

Inactive Publication Date: 2013-11-20
李昊 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The production method of the existing waste paper deinking and bleaching pulp, no matter it is the deinking process or the bleaching process, all will add a large amount of Na + Ionic inorganic and organic compounds, to prevent Na + The accumulation of ions, the treated wastewater must also be discharged, which not only wastes water resources, but also causes environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Poplar, by slicing, washing, splitting, with 4% Mg(OH) 2 Add 5% H 2 o 2 Bleached for 2.5 hours at a temperature of 75°C and 25% concentration, then diluted to 2% concentration, screened through a sieve with a sieve gap of 0.15mm, and the slag that was screened out was concentrated to 25% concentration before grinding, and the concentrated waste water It is directly used for the washing of wood chips, and the waste water from wood chip washing is dewatered; the waste water from the pulp washer is all used for the dilution of high-concentration pulp in the previous process, and the waste water from the washer is pre-sedimented to remove about 50% of SS FeSO was added after anaerobic treatment 4 Carry out coagulation treatment, adjust the pH value to ++ Ions generate CaSO which is insoluble in water 4 , to prevent residual Fe in the system ++ The impact of ions on the pulping bleaching process, but also for further decolorization of wastewater, adding 150ppm of H 2 o ...

Embodiment 2

[0019] Poplar, by slicing, washing, splitting, with 4% Mg(OH) 2 Add 5% H 2 o 2 Bleached for 2.5 hours at a temperature of 75°C and 25% concentration, then diluted to 2% concentration, screened through a sieve with a sieve gap of 0.15mm, and the slag that was screened out was concentrated to 25% concentration before grinding, and the concentrated waste water It is directly used for the washing of wood chips, and the waste water from wood chip washing is dewatered; the waste water from the pulp washer is all used for the dilution of high-concentration pulp in the previous process, and the waste water from the washer is directly added to Al 2 (SO 4 ) 3 Carry out coagulation treatment, adjust the pH value to ++ Ions generate CaSO which is insoluble in water 4 , the excess Al in the system +++ ion with OH - Ions generate Al(OH) 3 Precipitate, then add 5ppm polymer flocculant PAM for solid-liquid separation, and add Ca(OH) to the separated clarified water 2 Adjust the pH val...

Embodiment 3

[0021] Wheat straw, by cutting, washing, shredding, with 4% Mg(OH) 2 Add 5% H 2 o 2 Bleaching at a temperature of 75°C and a concentration of 25% for 2.5 hours, washing with pulp washing wastewater from the subsequent process and concentrating to a concentration of 25%, while adding 2% Mg(OH) 2 and 5% H 2 o 2 Refining after bleaching at 75°C for 2.5 hours, diluting to 2% concentration and sieving through a sieve with a sieve gap of 0.15mm. The waste water from the washing of grass slices is dewatered; the waste water from the pulp washer is used for the dilution of the high-concentration slurry in the previous process, and the waste water from the washer is pre-sedimented to remove about 50% of SS, and then passed through dehydration Add FeSO after oxygen treatment, aerobic treatment, secondary sedimentation and recovery of aerobic bacteria 4 Carry out coagulation treatment, adjust the pH value to ++ Ions generate CaSO which is insoluble in water 4 , to prevent residual ...

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PUM

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Abstract

The invention discloses a zero-wastewater-emission pulping method, which is characterized in that: in the pulping process, the used medicaments at most comprise Mg(OH)2 or MgO, H2SO4, CaO or Ca(OH)2, H2O2, O2, O3, bio-enzyme, and a surfactant. Coagulants used for physic-chemical treatment of wastewater generated in the pulping process are ferric salts, ferrous salts and aluminum salts with sulfate radicals. The pH value of the wastewater subjected to physic-chemical treatment is regulated by CaO or Ca(OH)2, and then all the wastewater is recycled in a pulping system.

Description

technical field [0001] The invention relates to a papermaking pulping method, in particular to a pulping method with zero waste water discharge. Background technique [0002] China's paper industry is facing environmental pollution problems caused by lack of water resources and wastewater discharge, which seriously restricts the development of the industry. Therefore, it has become an industry consensus to develop pulping methods with less or no wastewater discharge. [0003] The current non-deinking pulping methods of waste paper and the pure mechanical pulping of various plant fiber raw materials do not need to add various chemicals in the pulping process, but a large amount of chemical agents need to be added in the physical and chemical treatment of water treatment. Inorganic coagulants, in order to solve the accumulation of various anions and cations of inorganic coagulants, waste water should also be discharged into the environment. [0004] At present, various high-y...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21C11/00
Inventor 李昊苏河山
Owner 李昊