Organic-inorganic composite flocculant used for treating dyeing waste water and its preparation method and using method

An inorganic composite, printing and dyeing wastewater technology, applied in textile industry wastewater treatment, flocculation/sedimentation water/sewage treatment, etc., can solve the problems of weak adsorption and bridging ability, difficult biodegradation, high treatment cost, etc., and achieve low cost and easy biological Degradation, the effect of less dosage

Inactive Publication Date: 2008-02-20
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Inorganic flocculants have the advantages of low price and wide optimal dosing range, but they have disadvantages such as weak adsorption and bridging ability and large dosage
Although organic flocculants have strong adsorption and bridging capabilities and good product stability, they have high processing costs, and some are difficult to biodegrade, and some have certain toxic and side effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Add 10 grams of cornstarch into deionized water and stir at a high speed of 300 rpm for 5 minutes to form a 10% starch solution. Slowly add 4mL of 25% sodium hydroxide solution in a water bath at 55°C and stir slowly to modify React for 3 hours to make a modified starch solution; 600mL 0.5mol / L Al 2 (SO 4 ) 3 With 90mL 0.5mol / L FeCl 3 After the solution is fully mixed, add the modified starch solution, adjust the pH value to 4.0 with sulfuric acid, start 300 rpm in a water bath at 80°C for 3 minutes, then slowly stir at 30 rpm, and compound flocculation after 3 hours of compound reaction agent.

[0022] Add NaOH dropwise to 500mL of printing and dyeing wastewater to adjust the pH value to 6, add 5mL of composite flocculant, stir rapidly for 2 minutes, then stir slowly for 6 minutes, stand still for 30 minutes, take the supernatant to measure COD Cr Removal rate and decolorization rate. COD Cr The removal rate is 61.5%, and the decolorization rate is 92.4%.

Embodiment 2

[0024] Add 6 grams of cornstarch into deionized water and stir at a high speed at 100 rpm for 10 minutes to form a 6% by weight starch solution, slowly and uniformly add 4mL of 25% by weight sodium hydroxide solution in a water bath at 90°C, slowly Stir the modification reaction for 8 hours to make a modified starch solution; mix 55mL 0.5mol / L Al 2 (SO 4 ) 3 With 110mL 0.5mol / L FeCl 3 After the solution is fully mixed, add the modified starch solution, adjust the pH value to 1.0 with sulfuric acid, start 100 rpm in a 40°C water bath for 5 minutes, then slowly stir at 80 rpm, and compound flocculation after 5 hours of compound reaction agent.

[0025] Add Ca(OH) dropwise to 500mL printing and dyeing wastewater 2 Adjust the pH value to 10, add 7.5mL composite flocculant, first stir rapidly for 2 minutes, then stir slowly for 10 minutes, stand still for 30 minutes, take the supernatant to measure COD Cr Removal rate and decolorization rate. COD Cr The removal rate is 52.8%...

Embodiment 3

[0027] Add 20 grams of cornstarch into deionized water and stir at a high speed at 200 rpm for 6 minutes to form a 20% starch solution, slowly and uniformly add 10mL of 25% by weight sodium hydroxide solution in a water bath at 40°C, and stir slowly Modification reaction for 1 hour; 700mL0.5mol / L Al 2 (SO 4 ) 3 With 15mL 0.5mol / L FeCl 3 After the solution is fully mixed, add the modified starch solution, adjust the pH value to 2.0 with sulfuric acid, start 200 rpm in a 70°C water bath for 4 minutes, then slowly stir at 50 rpm, and compound flocculation after 2 hours of compound reaction agent.

[0028] Add NaOH dropwise to 500mL printing and dyeing wastewater to adjust the pH value to 8, add 2.5mL composite flocculant, first stir for 5 minutes at a fast speed, then stir at a slow speed for 5 minutes, stand still for 30 minutes and take the supernatant to measure COD Cr Removal rate and decolorization rate. COD Cr The removal rate is 63.8%, and the decolorization rate is ...

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Abstract

The invention discloses an organic-inorganic composite flocculant for the use of processing printing and dyeing wastewater and a preparation method and a utilization method thereof. The organic-inorganic composite flocculant takes soluble aluminum salt, ferric salt and corn starch as raw materials, and takes sulfate and calcium hydroxide as reaction auxiliary agent. The specific preparation procedures are that: firstly, a 6-20 percent of starch solution is made of the corn starch, then alkali liquor produced by a mass ratio of 6-15:1 between the starch and the alkali is added slowly and with even pace into the water of 40-90 DEG C and modified for 1-8 hours; then the modified starch solution is added into the aluminum salt and ferric salt solution by a mass ratio of 0.25-1:0.02-0.5:1 between the aluminum, iron and starch, the pH value is adjusted to be 1.0-4.0, and the composite flocculant is acquired after the complex reaction under a temperature condition of 40-90 DEG C for 2-5 hours. The flocculant preparation method of the invention is simple, and is convenient in utilization, with little dosing quantity of the reagents required, high removing rate of CODCr and high decoloration rate, easily biodegradable biodegradation.

Description

technical field [0001] The invention relates to a flocculant for treating printing and dyeing wastewater, a preparation method and a use method thereof. Background technique [0002] Water is the origin of life and the substance on which human beings and creatures depend for survival. At present, the problem of water pollution in the world is becoming more and more serious, and the problem of water treatment is also becoming more and more serious. According to statistics, in 2003, among the various industrial industries in the country, the top five industries with the largest amount of wastewater discharge were paper making, chemical manufacturing, electric power industry, ferrous metal smelting industry and textile printing and dyeing industry, and their wastewater discharge amount accounted for 10% of the national industrial wastewater discharge respectively. 16.8%, 16.5%, 13.1%, 9%, 7.5% of statistical emissions. my country is a big textile country in the world. With the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F103/30
Inventor 张淑娟杨宇林亲铁江纪修
Owner SUN YAT SEN UNIV
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