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Method for low-energy consumption condensation of waste liquid produced by alkaline peroxide mechanical pulping

A technology of hydrogen peroxide and mechanical pulping, which is applied in chemical instruments and methods, processing process wastewater treatment, energy wastewater treatment, etc., can solve the secondary pollution of tertiary chemical sludge, high energy consumption of alkali recovery technology, and discharge up to standard to achieve the effects of low operating costs, zero emissions, and reduced evaporation energy consumption

Inactive Publication Date: 2013-01-30
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to overcome the problems of high cost of traditional anaerobic + aerobic + chemical flocculation treatment, difficulty in reaching the standard discharge, secondary pollution of biochemical residual sludge and tertiary chemical sludge, and high energy consumption of traditional alkali recovery technology, the present invention provides a A low-energy concentration method suitable for alkaline hydrogen peroxide mechanical pulp waste liquid, which uses a membrane separation system to increase the concentration of pulping waste liquid from 1% to 2% to about 5%, and then uses two-stage mechanical repeated compression heat pump technology to decompress the waste liquid. The concentration of the liquid is further increased to about 15%, and the concentration of the plate-feeding falling film five-effect evaporation system is increased to more than 50%, and then sent to the alkali recovery furnace for combustion

Method used

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  • Method for low-energy consumption condensation of waste liquid produced by alkaline peroxide mechanical pulping
  • Method for low-energy consumption condensation of waste liquid produced by alkaline peroxide mechanical pulping

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Embodiment 1

[0022] A wood pulping plant uses purchased wood chips for pulping. The concentration of wood chips in the washing machine is 5%, and the corresponding water consumption is about 19m 3 / t wood chips, COD of wastewater Cr The concentration is 1800mg / L, BOD 5 The concentration is 500mg / L, the SS concentration is 1100mg / L, the pH is 6.4, the color is 660 times, and the water temperature is 80-90°C.

[0023] The waste liquid generated in the process of alkaline hydrogen peroxide mechanical pulping includes: squeeze tearer waste liquid, bleached screw press waste liquid, and slurry cone cleaner / pressure screen treatment waste liquid. The waste liquid of the chemical pulp squeezing and tearing machine contains a large amount of wood chips. After being treated by a cylindrical fine-grid sieve, the COD is about 13000mg / L. After the sieve, the waste liquid flows to the waste liquid intermediate tank, and then passes through the 0.10mm sieve. The pressure filter screen performs fine filtrati...

Embodiment 2

[0035] A wood pulping plant uses purchased wood chips for pulping. The concentration of wood chips in the washing machine is 5%, and the corresponding water consumption is about 19m 3 / t wood chips, COD of wastewater Cr The concentration is 1800mg / L, BOD 5 The concentration is 500mg / L, the SS concentration is 1100mg / L, the pH is 6.4, the color is 660 times, and the water temperature is 80-90°C.

[0036] The waste liquid generated in the process of alkaline hydrogen peroxide mechanical pulping includes: squeeze tearer waste liquid, bleached screw press waste liquid, and slurry cone cleaner / pressure screen treatment waste liquid. The waste liquid of the chemical pulp squeezing and tearing machine contains a large amount of wood chips. After being treated by a cylindrical fine-grid sieve, the COD is about 13000mg / L. After the sieve, the waste liquid flows to the waste liquid intermediate tank, and then passes through the 0.10mm sieve. The pressure filter screen performs fine filtrati...

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Abstract

The invention provides a method for low-energy consumption condensation of a waste liquid produced by alkaline peroxide mechanical pulping. The method fully combines characteristics of a ceramic ultrafiltration membrane, a mechanical repeat-compression heat pump and a plate-type falling-film evaporator, and utilizes the devices in concentration of waste liquids which have different properties and are obtained at different discharge points in chemithermomechanical pulping. In the method, the ceramic ultrafiltration membrane replaces an organic membrane, so that a high concentration grinding technology causes a high waste liquid temperature, and can be used for pre-concentration. The mechanical repeat-compression heat pump is used for concentration of a waste liquid from a low concentration to a middle concentration. The plate-type falling-film evaporator is used for concentration of a waste liquid from a middle concentration to a high concentration. The method integrates and optimizes multiple energy-saving technologies, greatly reduces evaporation energy consumption of a waste liquid produced by alkaline peroxide mechanical pulping, realizes waste liquid zero-discharge in the whole alkaline peroxide mechanical pulping process, thoroughly solves the problem that a waste liquid produced by alkaline peroxide mechanical pulping is treated difficultly, and has a simple process flow and a low operation cost.

Description

Technical field [0001] The invention belongs to a method for concentration and treatment of pulping waste liquid, in particular to a low-energy concentration and treatment method for alkaline hydrogen peroxide mechanical pulping waste liquid. Background technique [0002] In recent years, with the implementation of the forest-paper integration strategy, chemical mechanical pulp based on alkaline hydrogen peroxide mechanical pulping (APMP) has been rapidly developed, and its high fiber raw material utilization rate has been fully utilized, directly reducing The consumption of fiber raw materials, and because this method has the characteristics of high pulping yield and relatively low pollutant load of wastewater discharged from the process, it has become one of the main ways to increase pulping capacity in China in recent years. The total production capacity of hydrogen oxide mechanical pulp has exceeded 3 million tons, which will be the development direction of China's pulping an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/44C02F1/08C02F103/28
CPCY02W10/37
Inventor 苏振华曹春昱冯文英徐明张升友王承亮张羽曹瀛戈应广东乔军
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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