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Chemi-mechanical pulp wastewater treatment technology and device with coupled membrane separation and evaporation

A treatment process and treatment device technology, applied in the field of chemical-mechanical-slurry wastewater membrane separation coupled with evaporation treatment, can solve the problems of high energy consumption and large processing capacity of the evaporation process, so as to prolong the service life of the membrane, reduce the amount of external drainage, and achieve a large amount of recycling. Effect

Pending Publication Date: 2019-07-05
RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the chemical-mechanical pulp wastewater is treated by evaporation, due to the large water volume and low relative solid content, the evaporation process has the disadvantages of large processing capacity and high energy consumption. The coupling of membrane separation technology and evaporation technology not only reduces the treatment cost, but also solves the problem. Solved the problem of resource treatment of concentrated liquid in membrane separation process

Method used

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  • Chemi-mechanical pulp wastewater treatment technology and device with coupled membrane separation and evaporation
  • Chemi-mechanical pulp wastewater treatment technology and device with coupled membrane separation and evaporation
  • Chemi-mechanical pulp wastewater treatment technology and device with coupled membrane separation and evaporation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0082] The comprehensive waste water of wheat straw straw chemical pulping, the water quality index of waste water is shown in Table 1.

[0083] Table 1 Water quality indicators of wheat straw chemical pulp wastewater

[0084]

[0085] Processing technology such as figure 1 As shown, after flocculation and sedimentation, part of the suspended matter was removed, and the COD Cr Reduced, the settled wastewater is filtered step by step through microfiltration, ultrafiltration, nanofiltration and reverse osmosis. Microfiltration adopts 500nm ceramic membrane with operating pressure of 0.3MPa, ultrafiltration adopts 50nm ceramic membrane with operating pressure of 0.3MPa, and nanofiltration adopts TFM composite fiber membrane with filtration accuracy of 150MWCO, operating pressure 1.0MPa, reverse osmosis adopts 0.1nm polyamide composite membrane, operating pressure 1.0MPa. After the waste water is filtered by microfiltration, the solid concentration of the concentrated liquid ...

Embodiment 2

[0093] Table 4 shows the water quality indicators of poplar chemical-mechanical pulp comprehensive wastewater.

[0094] Table 4 Water quality indicators of poplar chemical-mechanical pulp wastewater

[0095]

[0096] Processing technology such as figure 2 As shown, after flocculation and sedimentation, part of the suspended matter was removed, and the COD Cr The settled waste water is filtered step by step through microfiltration, nanofiltration and reverse osmosis. The microfiltration adopts 200nm ceramic membrane and the operating pressure is 0.3MPa. The nanofiltration adopts TFM composite fiber membrane with a filtration accuracy of 300MWCO and the operating pressure is 1.5MPa. The reverse osmosis adopts 0.1nm polyamide composite membrane, and the operating pressure is 3.5MPa. After the waste water is filtered by microfiltration, the solid concentration of the concentrated liquid is increased to 2.8%, which is used for evaporation treatment, and evaporated to a solid ...

Embodiment 3

[0104] Table 7 shows the water quality indicators of wheat straw straw chemical pulp comprehensive wastewater.

[0105] Table 7 Water quality indicators of wheat straw chemical pulp wastewater

[0106]

[0107] Processing technology such as figure 1 As shown, after flocculation and sedimentation, part of the suspended matter was removed, and the COD Cr The waste water after sedimentation is sent to the adsorption device for adsorption treatment. The adsorption device is filled with wheat husks removed during the preparation of wheat straw. The flow rate of the adsorption process is 10BV / h. The adsorption water is then subjected to microfiltration, ultrafiltration, nanofiltration, and reverse osmosis. Step by step filtration, microfiltration adopts 500nm ceramic membrane, operating pressure 0.3MPa, ultrafiltration adopts 50nm ceramic membrane, operating pressure 0.4MPa, nanofiltration adopts TFM composite fiber membrane with filtration accuracy of 300MWCO, operating pressur...

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Abstract

The invention relates to the field of comprehensive treatment of pulping wastewater, in particular to a treatment technology of chemi-mechanical pulp wastewater treatment of coupled membrane separation and evaporation and reuse of produced water of various sections for working sections suitable for production. Firstly, chemi-mechanical pulp wastewater runs through a grating, massive scum and debris are removed to product a pump and to guarantee the safety of subsequent operation, through step-by-step filtering of air flotation or sedimentation, microfiltration, ultrafiltration, nanofiltrationand reverse osmosis, the produced water is reused for the sections suitable for production of workshop chemi-mechanical pulp, and concentrate is subjected to evaporation or biological treatment, so that the purposes of wastewater treatment and reuse are achieved.

Description

technical field [0001] The invention relates to the field of comprehensive treatment of pulping wastewater. In particular, it relates to a treatment process in which chemical-mechanical pulp wastewater is treated with membrane separation coupled with evaporation, and water produced in each section is recycled to a suitable section for production. Background technique [0002] The pulp and paper industry is a technology-intensive industry that implements wastewater treatment projects. After the promulgation and implementation of the "Discharge Standards for Water Pollutants in the Pulp and Paper Industry" (GB3544-2008), with the increase in paper and cardboard production, the wastewater in the paper industry Emissions and COD emissions are decreasing year by year. In 2007, my country's paper and cardboard output was 73.5 million tons, and the wastewater discharge was 4.9 billion tons. In 2015, my country's paper and cardboard output was 107.1 million tons, and the wastewat...

Claims

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Application Information

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IPC IPC(8): C02F9/14C10L5/44
CPCC02F9/00C10L5/44C02F1/52C02F1/444C02F1/442C02F1/04C02F3/00Y02E50/10Y02E50/30
Inventor 盘爱享张华兰房桂干丁来保施英桥田庆文冉淼
Owner RES INST OF FORESTRY NEW TECH CHINESE ACAD OF FORESTRY
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