Straw pulping paper-making or sulfite method pulping paper-making middle piece waste water treatment technique

A sulfite method, pulping and papermaking technology, which is applied in the process of wastewater treatment, water/sewage treatment, water/sewage multi-stage treatment, etc. Sludge disintegration and other problems, to achieve the effect of good promotion and application value, reduction of chemical oxygen consumption, and compliance with discharge standards

Inactive Publication Date: 2008-08-06
HENAN ACADEMY OF SCI CHEM RES INST CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The mid-stage wastewater produced by this method contains a considerable amount of sulfite ions, and sulfite ions inhibit the activity of bacteria, which not only reduces the efficiency of biochemical treatment, but even makes biochemical reactions impossible, and the activated sludge disintegrates, affecting the biochemical treatment of wastewater. ; At the same time, sulfite ion consumes oxygen, and the oxygen consumption per kilogram is 0.2kg, and the following reactions take place: 2SO 3 2- +O 2 →2SO 4 2- As a result, the chemical oxygen consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0008] Example 1

[0009] The quicklime is measured and put into the digester, and 2kg per cubic meter of wastewater is added to the sump. The calcium sulfite produced is precipitated in the sedimentation tank and then enters the sludge treatment system for treatment. The middle-stage wastewater is then subjected to subsequent biochemical treatment.

Example Embodiment

[0010] Example 2

[0011] Calcium carbide mud (dryness 40%) is measured and put into the digestion tank, and 3 kg of wastewater per cubic meter is added to the digestion tank. The calcium sulfite produced is precipitated in the sedimentation tank and then enters the sludge treatment system for treatment. The middle-stage wastewater Subsequent biochemical treatment is carried out thereafter.

Example Embodiment

[0012] Example 3

[0013] Measure the floating liquid slag (dryness 50%) and put it into the digestion tank, and add 6kg of waste water per cubic meter into the sump. The calcium sulfite produced is deposited in the sedimentation tank and then enters the sludge treatment system. The wastewater is then subjected to subsequent biochemical treatment.

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PUM

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Abstract

The invention discloses a technology for processing wastewater in middle section of wheat straw cleaning pulping papermaking or sulfite process pulping papermaking. The technology carries out pretreatment to the wastewater of the middle section of the pulping papermaking, which comprises the processes: precipitant with calcium is selected and added in the wastewater of the middle section before the wastewater of the middle section is biochemistry processed; firstly, sulfite ion in the wastewater is removed so that the content of the sulfite ion in the wastewater is reduced; then the biochemistry processing is carried out. The technology for processing wastewater in middle section of wheat straw cleaning pulping papermaking or sulfite process pulping papermaking is economically feasible, uses waste to control waste, is suiting for national environmental policy and has a good application value for popularizing.

Description

technical field [0001] The invention relates to a pulping and papermaking wastewater treatment process, in particular to a wheat straw clean pulping and papermaking process or a sulfite process pulping and papermaking mid-stage wastewater treatment process. Background technique [0002] Sulfite pulping and papermaking is a method commonly used in the paper industry. At present, a considerable number of domestic paper mills that use grass as raw materials are still using it. The mid-stage wastewater produced by this method contains a considerable amount of sulfite ions, and sulfite ions inhibit the activity of bacteria, which not only reduces the efficiency of biochemical treatment, but even makes biochemical reactions impossible, and the activated sludge disintegrates, affecting the biochemical treatment of wastewater. ; At the same time, sulfite ion consumes oxygen, and the oxygen consumption per kilogram is 0.2kg, and the following reactions take place: 2SO 3 2- +O 2 →2...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/58C02F103/28
Inventor 唐启张富强孙海明
Owner HENAN ACADEMY OF SCI CHEM RES INST CO LTD
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