WO2022110089A1 - Waste water treatment composition for printing and dyeing wastewater, and preparation method therefor - Google Patents

Abstract

Disclosed is a waste water treatment composition for printing and dyeing wastewater. The composition contains, in percentage by weight, the following components: 40-60% of a flocculant, 30-50% of a modified nano-starch adsorbent, 5-10% of bentonite, 1-5% of a coagulant aid, and 1-5% of disodium ethylenediaminetetraacetate. The composition has a good treatment effect on printing and dyeing wastewater, the decolorization rate reaches 98.8% or more, and the COD removal rate reaches 99.8% or more.

Description

A kind of sewage treatment composition for printing and dyeing wastewater and preparation method thereof technical field

The invention belongs to the field of sewage treatment, and in particular relates to a sewage treatment composition for printing and dyeing wastewater and a preparation method thereof.

Background technique

The wastewater discharged from printing and dyeing, textile, dye and papermaking industries has the characteristics of large water volume, complex composition, high pollutant concentration, deep chromaticity, etc., and has certain anti-oxidation and anti-biodegradation properties. important source of pollution. The decolorization treatment of such high-concentration and high-chroma wastewater has always been one of the difficult problems of various discharge enterprises, and it must be effectively treated to reduce the pollution and harm to the environment.

For example, the Chinese invention patent with the application number CN202010259781.1 discloses a sewage treatment agent for printing and dyeing textile industry and a preparation method thereof. The sewage treatment agent is prepared from the following raw materials in parts by weight: coconut shell activated carbon/chitosan composite 30-40 parts, 5-10 parts of polyaluminum chloride, 1-5 parts of nickel nitrate, 5-10 parts of aerogel silica gel, 3-5 parts of polyferric sulfate, 5-8 parts of polyacrylamide, 5-10 parts of nitrifying bacteria The sewage treatment agent has a good effect on the treatment of printing and dyeing textile sewage, and the treated sewage meets the national discharge standard, can be recycled, and saves water resources. It is an efficient sewage treatment agent.

For another example, the Chinese invention patent with the application number CN201410503661.6 discloses a preparation method of a printing and dyeing wastewater treatment agent, comprising the following steps: (1) Weighing 10 parts of fly ash with a 100-mesh sieve, adding a mass concentration of 1.2% 50-150 parts of chitosan-based acetic acid solution of 50-150 parts of chitosan acetic acid solution, stirring rapidly for 0.5h; (2) then stirring at a slow speed, and mixing with 5% sodium hydroxide solution to neutrality while stirring to obtain a paste; (3) mixing the above After the paste is matured, it is filtered with suction, dried at a constant temperature of 110°C, and then passed through an 80-mesh sieve to obtain the desired printing and dyeing wastewater treatment agent. The beneficial effects of the invention are as follows: the printing and dyeing wastewater treatment agent realizes waste utilization, does not cause pollution to the environment, and fully utilizes the residual value of fly ash; using the printing and dyeing wastewater treatment agent, the decolorization rate of wastewater can reach 98% Above, the COD removal rate can reach more than 95%.

Based on the above-mentioned prior art, the inventors actively conduct research and innovation with rich practical experience and professional knowledge engaged in such products for many years, and cooperate with the application of theory, in order to create a sewage treatment composition for printing and dyeing wastewater and its preparation The method, the composition can effectively remove harmful substances in printing and dyeing wastewater.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to overcome the deficiencies in the prior art, and to provide a sewage treatment composition for printing and dyeing wastewater and a preparation method thereof. The composition can effectively remove harmful substances in printing and dyeing wastewater.

The purpose of the present invention and the technical problem to be solved are achieved by adopting the following technical solutions.

The invention provides a sewage treatment composition for printing and dyeing wastewater. In terms of weight percentage, the composition includes the following components and the content of each component is: flocculant 40-60%, modified nano-starch adsorbent 30-60% 50%, bentonite 5-10%, coagulant aid 1-5%, disodium EDTA 1-5%.

The aforementioned sewage treatment composition for printing and dyeing wastewater, wherein, in terms of weight percentage, the composition includes the following components and the content of each component is: flocculant 50%, modified nanostarch adsorbent 35%, bentonite 8% , 3% coagulant aid, 4% disodium EDTA.

The aforementioned sewage treatment composition for printing and dyeing wastewater, wherein, in terms of weight percentage, the composition includes the following components and the content of each component is: flocculant 50%, modified nanostarch adsorbent 40%, bentonite 5% , 3% coagulant aid, 2% disodium EDTA.

In the aforementioned sewage treatment composition for printing and dyeing wastewater, wherein the flocculant is selected from any one of polyferric sulfate aluminum chloride, polyferric sulfate, polyacrylamide, and polyaluminum chloride.

The aforementioned sewage treatment composition for printing and dyeing wastewater, wherein the coagulant is selected from the nitrate and sulfate of lanthanum, cerium, praseodymium, neodymium, lutetium, europium, gadolinium, erbium, thulium, yttrium or more.

The purpose of the present invention and the solution to its technical problems are also achieved by adopting the following technical solutions.

The invention provides a preparation method of a sewage treatment composition for printing and dyeing wastewater, which comprises the following steps:

(1) Add nano-starch granules, citric acid and potassium dihydrogen phosphate into water to dissolve completely, then heat to 130～150℃ for 3～5h reaction; then wash, suction filter, and dry; add the obtained product and ammonium chloride solution into into water, heated to 70 to 90 °C and stirred for 0.5 to 1 h to prepare a mixed solution; then added acrylamide solution, continued to stir for 3 h, then washed, suction filtered, and dried to obtain a modified nanostarch adsorbent;

(2) dissolving the flocculant in water, adding bentonite and disodium EDTA under stirring conditions, and obtaining a mixed solution after the reaction;

(3) The modified nano-starch adsorbent and the coagulant aid are sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

In the aforementioned preparation method, the mass ratio of the nano-starch particles, citric acid and potassium dihydrogen phosphate in the step (1) is 1:(0.1-0.5):(0.1-0.5).

In the aforementioned preparation method, the concentration of the ammonium chloride solution in the step (1) is 0.1-0.5 mol/L.

In the aforementioned preparation method, the concentration of the acrylamide solution in the step (1) is 0.1-0.5 mol/L.

The aforementioned preparation method, wherein, the reaction conditions in the step (2) are: the temperature is 20-40° C., and the time is 1-3 hours.

With the above technical solutions, the present invention has at least the following advantages: the sewage treatment composition of the present invention has good stability and is suitable for treating printing and dyeing wastewater. The sewage treatment composition provided by the invention adopts nano-starch as the base material, and has excellent wastewater treatment effect, no secondary pollution, economical and environmental protection, and abundant and renewable raw materials, and has a huge application prospect. The sewage treatment composition of the invention has good treatment effect on waste water, can generate larger flocs during the flocculation process, the decolorization rate reaches over 98.8%, and the COD removal rate reaches over 99.8%.

To sum up, the special sewage treatment composition for printing and dyeing wastewater of the present invention has the advantage of good decolorization effect. It has many of the above advantages and practical value, and there is no similar design published or used in similar products and methods, but it is indeed an innovation. It has great improvements in both methods and functions. It has made great progress, and has produced easy-to-use and practical effects. Compared with the existing products, it has improved many functions, so it is more suitable for practical use, and has the value of extensive use in the industry. It is a novel, progressive, and Practical new design.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly, and to implement according to the content of the description, the preferred embodiments of the present invention are described in detail below.

Detailed ways

In order to make it easy to understand the technical means, creative features, goals and effects realized by the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the described embodiments It is only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

Example 1

Add nano-starch granules, citric acid and potassium dihydrogen phosphate in a mass ratio of 1:0.3:0.3 into water to dissolve completely, then heat to 140°C for 4 hours of reaction; then wash, filter, and dry; the obtained product and concentration A 0.3 mol/L ammonium chloride solution was added to the water, heated to 80 °C and stirred for 0.5 h to prepare a mixed solution; then a 0.3 mol/L acrylamide solution was added, stirring continued for 3 h, then washing and suction filtration, and After drying, the modified nano-starch adsorbent is obtained. Dissolve 50 parts of polyferric sulfate aluminum chloride in 100 parts of water, add 8 parts of bentonite and 4 parts of disodium EDTA under stirring conditions, and react at 30° C. for 2 hours to obtain a mixed solution. 35 parts of modified nano-starch adsorbent and 3 parts of cerium nitrate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Example 2

Add nano-starch particles, citric acid and potassium dihydrogen phosphate into water in a mass ratio of 1:0.1:0.5 to complete dissolution, then heat to 140 °C for reaction for 4 hours; then wash, suction, filter, and dry; A 0.1 mol/L ammonium chloride solution was added to the water, heated to 80 °C and stirred for 0.5 h to prepare a mixed solution; then a 0.5 mol/L acrylamide solution was added, stirring continued for 3 h, then washing and suction filtration, and After drying, the modified nano-starch adsorbent is obtained. Dissolve 50 parts of polymeric ferric sulfate in 100 parts of water, add 5 parts of bentonite and 2 parts of disodium EDTA under stirring conditions, and react at 30° C. for 2 hours to obtain a mixed solution. 40 parts of modified nano-starch adsorbent and 3 parts of praseodymium nitrate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Example 3

Add nano-starch particles, citric acid and potassium dihydrogen phosphate into water in a mass ratio of 1:0.1:0.5 to complete dissolution, then heat to 140 °C for reaction for 4 hours; then wash, suction, filter, and dry; A 0.1 mol/L ammonium chloride solution was added to the water, heated to 80 °C and stirred for 0.5 h to prepare a mixed solution; then a 0.5 mol/L acrylamide solution was added, stirring continued for 3 h, then washing and suction filtration, and After drying, the modified nano-starch adsorbent is obtained. 50 parts of polyacrylamide were dissolved in 100 parts of water, 8 parts of bentonite and 1 part of disodium EDTA were added under stirring conditions, and a mixed solution was obtained after reacting at 30° C. for 2 hours. 40 parts of modified nano-starch adsorbent and 1 part of neodymium sulfate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Example 4

Add nano-starch granules, citric acid and potassium dihydrogen phosphate in a mass ratio of 1:0.3:0.3 into water to dissolve completely, then heat to 150°C for reaction for 3 hours; then wash and suction filter, and dry; the obtained product and concentration A 0.5 mol/L ammonium chloride solution was added to water, heated to 90°C and stirred for 0.1 h to prepare a mixed solution; then a 0.5 mol/L acrylamide solution was added, stirring continued for 3 h, then washing and suction filtration, and After drying, the modified nano-starch adsorbent is obtained. Dissolve 50 parts of polyaluminum chloride in 100 parts of water, add 8 parts of bentonite and 1 part of disodium EDTA under stirring conditions, and react at 30° C. for 2 hours to obtain a mixed solution. 40 parts of modified nano-starch adsorbent and 1 part of neodymium nitrate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Example 5

Add nano-starch particles, citric acid and potassium dihydrogen phosphate into water in a mass ratio of 1:0.2:0.3 to complete dissolution, then heat to 150 °C for reaction for 3 hours; then wash, suction, filter, and dry; A 0.1 mol/L ammonium chloride solution was added to water, heated to 70°C and stirred for 1 h to prepare a mixed solution; then a 0.3 mol/L acrylamide solution was added, stirring continued for 3 h, then washed and suction filtered, and dried treatment to obtain a modified nano-starch adsorbent. Dissolve 50 parts of polyaluminum chloride in 100 parts of water, add 5 parts of bentonite and 2 parts of disodium EDTA under stirring conditions, and react at 40° C. for 2 hours to obtain a mixed solution. 40 parts of modified nano-starch adsorbent and 3 parts of lutetium sulfate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Example 6

Add nano-starch particles, citric acid and potassium dihydrogen phosphate into water in a mass ratio of 1:0.2:0.3 to complete dissolution, then heat to 150 °C for reaction for 3 hours; then wash, suction, filter, and dry; A 0.1 mol/L ammonium chloride solution was added to water, heated to 70°C and stirred for 1 h to prepare a mixed solution; then a 0.3 mol/L acrylamide solution was added, stirring continued for 3 h, then washed and suction filtered, and dried treatment to obtain a modified nano-starch adsorbent. 40 parts of polyacrylamide were dissolved in 100 parts of water, 10 parts of bentonite and 5 parts of disodium EDTA were added under stirring conditions, and the mixed solution was obtained after reacting at 40° C. for 2 hours. 40 parts of modified nano-starch adsorbent and 5 parts of lanthanum sulfate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Example 7

Add nano-starch particles, citric acid and potassium dihydrogen phosphate into water in a mass ratio of 1:0.3:0.1 to complete dissolution, then heat to 140 °C for reaction for 3 hours; then wash, suction, filter, and dry; A 0.3mol/L ammonium chloride solution was added to water, heated to 80°C and stirred for 1 h to prepare a mixed solution; then a 0.3mol/L acrylamide solution was added, stirring continued for 3h, then washing, suction filtration, and drying treatment to obtain a modified nano-starch adsorbent. Dissolve 60 parts of polyferric sulfate aluminum chloride in 100 parts of water, add 5 parts of bentonite and 3 parts of disodium EDTA under stirring conditions, and react at 40° C. for 2 hours to obtain a mixed solution. 30 parts of modified nano-starch adsorbent and 2 parts of lanthanum nitrate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Example 8

Add nano-starch particles, citric acid and potassium dihydrogen phosphate into water in a mass ratio of 1:0.2:0.3 to complete dissolution, and heat to 140 °C for reaction for 3 hours; then wash, suction, filter, and dry; A 0.3mol/L ammonium chloride solution was added to water, heated to 80°C and stirred for 1 h to prepare a mixed solution; then a 0.3mol/L acrylamide solution was added, stirring continued for 3h, then washing, suction filtration, and drying treatment to obtain a modified nano-starch adsorbent. Dissolve 40 parts of polymeric ferric sulfate in 100 parts of water, add 5 parts of bentonite and 3 parts of disodium EDTA under stirring conditions, and react at 30° C. for 2 hours to obtain a mixed solution. 50 parts of modified nano-starch adsorbent and 2 parts of lanthanum nitrate were sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.

Test Example 1 Evaluation of Wastewater Treatment Effect of Wastewater Treatment Composition

Test method: The compositions prepared in Examples 1-8 were applied to the wastewater treatment test of printing and dyeing wastewater. The main water quality indicators of the original printing and dyeing wastewater are shown in Table 1. The specific method is as follows: in the treatment process, the composition is directly added to the waste water according to the feeding ratio of 20 mL per liter of water, first stirred at a speed of 400 r/min for 5 minutes, and after standing for 60 minutes for precipitation, the supernatant liquid is taken to measure various items. indicators, see Table 2 for the results.

Table 1 Water Quality Index of Printing and Dyeing Wastewater

index	COD, mg/L	Chroma	color	Turbidity
Dyeing Wastewater	1250	500	dark yellow	150

Table 2 Determination of indicators after treatment

Numbering	COD, mg/L	Chroma	color	Turbidity
Example 1	2.5	6	colorless	7
Example 2	3.4	9	colorless	13
Example 3	7.1	16	colorless	10
Example 4	3.6	10	colorless	8
Example 5	8.9	11	colorless	12
Example 6	7.7	15	colorless	9
Example 7	10.4	13	colorless	11
Example 8	4.2	13	colorless	13

It can be seen from the results in Tables 1 and 2 that the composition of the present invention has the advantages of strong adsorption capacity, good decolorization effect, and good treatment effect on printing and dyeing wastewater. The decolorization rate reaches more than 98.8%, and the COD removal rate reaches 99.8%. above.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. The skilled person, within the scope of the technical solution of the present invention, can make some changes or modifications to equivalent examples of equivalent changes by using the methods and technical contents disclosed above, but not departing from the content of the technical solution of the present invention, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (10)

1. A sewage treatment composition for printing and dyeing wastewater, in terms of percentage by weight, the composition comprises the following components and the contents of each component are: flocculant 40-60%, modified nano-starch adsorbent 30-50%, bentonite 5～10%, coagulation aid 1～5%, disodium EDTA 1～5%.
2. The sewage treatment composition for printing and dyeing wastewater according to claim 1, wherein, by weight percentage, the composition comprises the following components and the content of each component is: flocculant 50%, modified nano-starch adsorbent 35% %, bentonite 8%, coagulant aid 3%, disodium EDTA 4%.
3. The sewage treatment composition for printing and dyeing wastewater according to claim 1, wherein, in terms of weight percentage, the composition comprises the following components and the content of each component is: flocculant 50%, modified nano-starch adsorbent 40% %, bentonite 5%, coagulant aid 3%, disodium EDTA 2%.
4. The sewage treatment composition for printing and dyeing wastewater according to claim 1, wherein the flocculant is selected from any one of polyferric sulfate aluminum chloride, polyferric sulfate, polyacrylamide, and polyaluminum chloride.
5. The sewage treatment composition for printing and dyeing wastewater according to claim 1, wherein the coagulant is selected from the group consisting of lanthanum, cerium, praseodymium, neodymium, lutetium, europium, gadolinium, erbium, thulium, yttrium nitrate, sulfuric acid one or more of the salts.
6. A preparation method of a sewage treatment composition for printing and dyeing wastewater, the method comprising the following steps:

   (1) Add nano-starch granules, citric acid and potassium dihydrogen phosphate into water to dissolve completely, then heat to 130～150℃ for 3～5h reaction; then wash, suction filter, and dry; add the obtained product and ammonium chloride solution into into water, heated to 70 to 90 °C and stirred for 0.5 to 1 h to prepare a mixed solution; then added acrylamide solution, continued to stir for 3 h, then washed, suction filtered, and dried to obtain a modified nanostarch adsorbent;

   (2) dissolving the flocculant in water, adding bentonite and disodium EDTA under stirring conditions, and obtaining a mixed solution after the reaction;

   (3) The modified nano-starch adsorbent and the coagulant aid are sequentially added to the above mixed solution, stirred evenly at room temperature, and then vacuum-dried overnight to obtain a sewage treatment composition.
7. The preparation method according to claim 6, wherein the mass ratio of the nano-starch particles, citric acid and potassium dihydrogen phosphate in the step (1) is 1:(0.1-0.5):(0.1-0.5).
8. The preparation method according to claim 6, wherein the concentration of the ammonium chloride solution in the step (1) is 0.1-0.5 mol/L.
9. The preparation method according to claim 6, wherein the concentration of the acrylamide solution in the step (1) is 0.1-0.5 mol/L.
10. The preparation method according to claim 6, wherein the reaction conditions in the step (2) are: a temperature of 20-40° C. and a time of 1-3 hours.