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Method for deeply processing waste water from paper making

A technology for papermaking wastewater and advanced treatment, which is applied in processing wastewater treatment, water/sewage multi-stage treatment, oxidized water/sewage treatment, etc. requirements, etc., to achieve the effect of good chromaticity removal, low investment and high pollutant removal rate

Inactive Publication Date: 2010-05-19
MCC PAPER YINHE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing general processes for the advanced treatment of papermaking wastewater include: physicochemical flocculation sedimentation + filtration method. This method has a simple process, a small one-time investment, and can remove some pollutants. However, after the removal rate of pollutants in the advanced treatment of biochemical wastewater reaches a certain level, Difficult to improve, with the continuous improvement of emission standards, it is difficult to meet the requirements
Flocculation sedimentation + sand filtration + ozone oxidation + activated carbon adsorption method, this process has high pollutant removal efficiency and can discharge up to the standard, but the process is long, the equipment is complicated, the one-time investment is large, the activated carbon will fail after adsorption saturation, and the operating cost is high. unacceptable
Electrolysis, the method is simple in process and fast in processing speed, but the energy consumption is too high and the economy is poor
The UF+RO membrane method is very effective in reducing suspended solids and desalination, but the one-time investment and operating costs are very high

Method used

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  • Method for deeply processing waste water from paper making
  • Method for deeply processing waste water from paper making
  • Method for deeply processing waste water from paper making

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) The papermaking wastewater after secondary biochemical treatment, on the pipeline flowing to the sump, first add ferrous chloride with a concentration of 25% by weight, adjust the pH value to 3, and then add a concentration of 5% by weight % hydrogen peroxide, the volume ratio of the ferrous chloride solution and the hydrogen peroxide solution is 1.2: 1, the sewage mixed with the above two medicaments and the secondary biochemical wastewater enters the folding plate reaction tank, and reacts in the folding plate The residence time in the tank is 1 minute, and after the sewage flows out of the folding plate reaction tank, add the white liquor to adjust the pH value of the sewage to 7;

[0021] (2) The reaction of hydrogen peroxide and ferrous chloride releases a large amount of carbon dioxide, which is shown as a large number of small air bubbles in the water. A mixer is set in the sump for stirring. Make the small bubbles in the water overflow the water surface, pre...

Embodiment 2

[0027] (1) Papermaking wastewater after secondary biochemistry is introduced into the sump through pipelines, and on the pipeline flowing to the sump, it is first added a medicament ferrous sulfate solution with a concentration of 20% by weight to adjust the pH value to 2.5, and then add 100% by weight Concentration is 4.5% agent hydrogen peroxide solution, the volume ratio of described ferrous sulfate solution and hydrogen peroxide solution is 1.2:1, the sewage after the above two kinds of agents are mixed with secondary biochemical papermaking wastewater enters the folding plate reaction Tank, the residence time in the folding plate reaction tank is 1.5 minutes, after the sewage flows out of the folding plate reaction tank, add the white liquor of the medicine, and adjust the pH value of the sewage to 6;

[0028] (2) The sewage mixed with the three kinds of medicaments in step (1) enters the sump, and the sump has a mixer for stirring, and the medicament and the sewage furthe...

Embodiment 3

[0034] (1) papermaking waste water after secondary biochemistry, introduce sump through pipeline, on the pipeline that flows to sump, add weight percent concentration earlier and be 30% medicament ferrous chloride salt solution and adjust pH value to be 3.5, then add weight Percentage concentration is 5.5% medicament hydrogen peroxide solution, the volume ratio of described ferrous chloride solution and hydrogen peroxide solution is 1.2: 1, the sewage after above-mentioned two kinds of medicaments are mixed with secondary biochemical papermaking waste water enters folding Plate reaction tank, the residence time in the folded plate reaction tank is 2 minutes, after the sewage flows out of the folded plate reaction tank, white liquor is added to adjust the pH value of the sewage to 8;

[0035] (2) The sewage mixed with the three kinds of medicaments in step (1) enters the sump, and the sump has a mixer for stirring, and the medicament and the sewage further fully react in the sum...

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Abstract

The invention provides a method for deeply processing waste water from paper making by oxidative degradation, flocculation precipitation and sand leaching, which is characterized by low investment, simple process, high pollutant removal rate and low operation cost. After the waste water is processed by the method, the COD is less than 70mg / L, the BOD5 is less than 20mg / L, and SS is less than 30mg / L.

Description

technical field [0001] The invention relates to a sewage treatment method, in particular to a papermaking industry sewage advanced treatment method. Background technique [0002] In the production of the paper industry, a large amount of industrial wastewater will be produced, which contains a variety of hydrocarbons, phenols, benzene, anthracene, quinones and other organic substances and their derivatives, polymers, as well as a large amount of suspended solids, lignin and other harmful substances. It cannot be discharged directly, and must be purified and met the discharge standard before it can be discharged outside. At present, the treatment of papermaking wastewater generally adopts the method of secondary biochemical + advanced treatment. After the secondary biochemical treatment of papermaking wastewater is completed, the five-day biochemical oxygen demand is usually very low, and the biodegradability is very poor. The conventional biochemical advanced treatment proc...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F1/72C02F1/52C02F103/28
Inventor 张义华毋永强王秋云王亚萍
Owner MCC PAPER YINHE
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