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A kind of printing and dyeing wastewater treatment agent and treatment method

A technology for printing and dyeing wastewater and treatment methods, which is applied in the textile industry wastewater treatment, water/sewage treatment, adsorption water/sewage treatment, etc. It has been greatly improved, and it cannot meet the problems of economic and environmental protection, and achieves excellent flocculation effect, improved adsorption and removal effect, and excellent flocculation effect.

Active Publication Date: 2020-08-14
SHANDONG XINTAI WATER TREATMENT TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the disadvantage of this method is that it will cause secondary pollution of the environment, the cost is high, and it cannot meet the requirements of economic and environmental protection.
However, the disadvantage of this method is that its adsorption performance and flocculation performance have not been greatly improved.
However, the disadvantage of this method is that its adsorption performance and flocculation performance have not been greatly improved.
However, its adsorption and flocculation performance has not been greatly improved.

Method used

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  • A kind of printing and dyeing wastewater treatment agent and treatment method
  • A kind of printing and dyeing wastewater treatment agent and treatment method
  • A kind of printing and dyeing wastewater treatment agent and treatment method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Preparation of printing and dyeing wastewater treatment agent:

[0050] 1) Preparation of modified nano starch adsorbent:

[0051] S1. Add nano-starch granules, citric acid and potassium dihydrogen phosphate according to the ratio of 80% by mass: 11%: 9% to a container filled with deionized water until they are completely dissolved, and put them in an oven at 140°C Carry out the esterification cross-linking reaction under the conditions for 4 hours; use deionized water to wash to neutrality, then filter the solid through a suction filtration instrument, and dry it to obtain esterified nano-starch particles;

[0052] S2. Add the esterified nano-starch granules and potassium persulfate into a container filled with deionized water, heat to 80° C. and stir for 0.5 h to prepare a mixed solution, wherein the concentration of potassium persulfate is 0.006 mol / L; Then add 1 mol / L acrylamide solution, stir at 80°C for 4 hours to carry out acrylamide grafting reaction, then cool...

Embodiment 2-5

[0064] The difference from Example 1 lies in that the adjustment settings of the pH value are different, as shown in Table 1, and other steps are the same as in Example 1, and will not be repeated here.

[0065] Table 1 is the adjustment setting of pH value and its adsorption performance parameter measured value in embodiment 1-5 and comparative example 1

[0066]

[0067] Please refer to Table 1. As the pH value of printing and dyeing wastewater increases, the adsorption effect of the modified nano-starch adsorbent on methylene blue gradually increases. Methylene blue is a cationic dye with positive charge. In the present invention, the carboxylic acid group (-COOH) on the adsorbent grafted and cross-linked by citric acid has a deprotonation process after the pH increases, and -COOH removes H to form -COO - , which in turn has an excellent adsorption effect on the positively charged methylene blue on the surface. When the pH value gradually increased, the deprotonation of...

Embodiment 6-7

[0076] The difference with Example 1 is: the difference in the preparation process parameters of the modified nano-starch adsorbent, as shown in Table 3, other steps are the same as in Example 1, and will not be repeated here.

[0077] Table 3 is the setting of modified nano starch adsorbent preparation process parameters in embodiment 1 and embodiment 6-7

[0078] Example Nano starch: citric acid: Potassium dihydrogen phosphate Acrylamide potassium persulfate Example 1 80％：11％：9％ 1mol / L 0.006mol / L Example 6 85％：8％：7％ 2mol / L 0.008mol / L Example 7 75％：14％：11％ 0.5mol / L 0.003mol / L

[0079]In the process of preparing the modified nano-starch adsorbent, the mass ratio of nano-starch, citric acid and potassium dihydrogen phosphate, as well as changes in temperature and time will all affect the esterification and cross-linking reaction of nano-starch particles by citric acid. It will have a certain impact, and then affect the number of...

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Abstract

The invention provides a printing and dyeing wastewater treatment agent and a treatment method. The printing and dyeing wastewater treatment agent comprises a modified nano-starch adsorbent and a modified nano-starch flocculant. According to the treatment agent, nano-starch is adopted to serve as an adsorbent matrix, and citric acid is added for esterification crosslinking with nano-starch particles; and then acrylamide is grafted to the nano-starch particles through a potassium persulfate initiator to obtain the modified nano-starch adsorbent. Besides, the nano-starch is further adopted to serve as a flocculant matrix, 3-chloro-2-hydroxypropyl trimethylammonium chloride is used as a cationic etherifying agent, sodium hydroxide is used as a catalyst, and the modified nano-starch flocculantis prepared. The invention further provides the treatment method of the printing and dyeing wastewater. According to the treatment method, firstly, the pH value of the to-be-treated printing and dyeing wastewater is regulated; and the modified nano-starch adsorbent and the modified nano-starch flocculant are sequentially added in two steps and are stirred for a full reaction. Through the treatment method, the dye and heavy metal pollutant adsorption and flocculation properties are excellent without secondary pollution.

Description

technical field [0001] The invention relates to the technical field of wastewater treatment, in particular to a printing and dyeing wastewater treatment agent and a treatment method. Background technique [0002] Printing and dyeing wastewater is a kind of harmful industrial wastewater formed by dyes discharged along with wastewater during the printing and dyeing process of textiles. It mainly contains various complex ingredients such as dyes, heavy metals, pastes, organic additives, oil agents, acids and bases, fiber impurities, and inorganic salts. Therefore, printing and dyeing wastewater has high chroma, high salinity, large pH value changes, and a large number of different types of pollutants such as dyes, heavy metals, and inorganic salts, making it one of the more difficult industrial wastewater to treat. [0003] At present, the methods for treating printing and dyeing wastewater mainly include adsorption method, flocculation method, catalytic oxidation method, elec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/28C02F1/56B01J20/24B01J20/28B01J20/30C02F101/20C02F101/30C02F103/30
CPCB01J20/24B01J20/28004B01J20/28016C02F1/286C02F1/56C02F2101/20C02F2101/308C02F2103/30
Inventor 杨雯雯李桂云
Owner SHANDONG XINTAI WATER TREATMENT TECH
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