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New method for flocculating printing and dyeing sewage

A printing and dyeing sewage, selective technology, applied in the direction of flocculation/sedimentation water/sewage treatment, textile industry wastewater treatment, etc., can solve the problems of long time flocculation reaction, flocculant toxicity, etc., to shorten the flocculation time, enhance the purification effect, reduce effect of input

Inactive Publication Date: 2010-12-08
SHANGHAI SHANZHAO IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In production, the flocculant has the following disadvantages: First, the flocculant itself is toxic. For example, the widely used polyacrylamide (PAM) is an organic polymer flocculant with a large molecular weight and ionicity, which is harmful to industrial production. There are good results in the treatment of many wastewaters in the paper industry, and it has also been reported in the wastewater treatment of the paper industry
Second, the flocculation reaction takes a long time

Method used

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  • New method for flocculating printing and dyeing sewage
  • New method for flocculating printing and dyeing sewage
  • New method for flocculating printing and dyeing sewage

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1 The flocculant formula that the present invention adopts and the effect comparison of other formulas

[0017] The printing and dyeing sewage pulped with straw as raw material is the test water sample, and its original COD is 12000mg / L (COD is measured by potassium dichromate method). At room temperature, the above-mentioned printing and dyeing sewage was equally divided into 3 parts, 100 mL each, and the stirring speed was 50 rpm / min, and potassium aluminum sulfate, ferrous sulfate, cationic polyacrylamide and chitin were added in sequence, so that the final concentrations of the above components were respectively 5%, 3%, 0.2% and 2%, adjust the pH value to 7.8, put it aside for 4 hours, take the supernatant to measure COD, the average COD is reduced to 327mg / L, and the COD removal rate is 97.3%. The other group used the same straw pulp raw material, added 0.1% polyaluminum chloride and 1% polyacrylamide, and aged for 4 hours according to the same pH and th...

Embodiment 2

[0018] The influence of embodiment 2 different pH values ​​on flocculation reaction

[0019] Take above-mentioned papermaking printing and dyeing sewage printing and dyeing sewage speed to be 50rpm / min, add aluminum potassium sulfate, ferrous sulfate, cationic polyacrylamide and chitin successively, make the final concentration of above-mentioned composition be respectively 5%, 3%, 0.2% and 2%, flocculation was carried out under different pH conditions, the temperature of the water sample was room temperature, and after 6 hours of aging, the supernatant was taken to measure COD, and the test results were as follows figure 1 shown. As shown in the figure, pH has a great influence on the flocculation reaction, and the flocculation effect is the best when the pH is between 7.7 and 8.0, and the COD removal rate is about 95%.

Embodiment 3

[0020] The influence of embodiment 3 flocculation time on flocculation reaction

[0021] Take above-mentioned papermaking printing and dyeing sewage printing and dyeing sewage speed to be 50rpm / min, add aluminum potassium sulfate, ferrous sulfate, cationic polyacrylamide and chitin successively, make the final concentration of above-mentioned composition be respectively 5%, 3%, 0.2% and 2%, after adjusting the pH value to 7.8, take the supernatant to measure COD every hour, the test results are as follows figure 2 shown. As shown in the figure, the flocculation reaction is basically completed in about 3 hours, and the continued aging after 3 hours has little effect on reducing COD.

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PUM

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Abstract

The invention discloses a method for selectively settling printing and dyeing sewage. The method comprises the following steps of: putting the printing and dyeing sewage into reactor, adding 5 percent of aluminum potassium sulfate, 3 percent of ferrous sulfate, 0.2 percent of cationic polyacrylamide, 2 percent of chitin and 2 percent of palygorskite powder into the reactor, adjusting the pH to between 7.7 and 8.0 and settling the mixture for 3 hours, wherein the removal rate of COD in straw pulp reaches over 95 percent. Compared with the traditional process, the new method provided by the invention for settling the printing and dyeing sewage has the advantages of shorter flocculation reaction time, higher COD removal rate, higher settling speed of the printing and dyeing sewage and better decolorizing effect.

Description

[0001] Technical field: The present invention relates to a method for selectively degrading printing and dyeing sewage, specifically adopting a new flocculant formula to precipitate and recover lignin for printing and dyeing sewage; and using palygorskite powder to further purify printing and dyeing sewage. technical background: [0002] According to the statistics of the textile industry, the total amount of printing and dyeing wastewater discharged in my country every year is 550 million. The untreated printing and dyeing wastewater has high chroma, and the pollution to the environment has become increasingly serious. Because the discharge of printing and dyeing wastewater is very large, physical and chemical methods of adsorption and flocculation are often used [0003] In recent years, the treatment of printing and dyeing sewage at home and abroad mainly includes: alkali recovery method, acid analysis method, plasma technology, liquid membrane separation technology, floccul...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F103/30
Inventor 黄润芸
Owner SHANGHAI SHANZHAO IND
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