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Preparation method of low-residue flocculant in wastewater and wastewater recycling method

A flocculant, low-residue technology, used in flocculation/sedimentation water/sewage treatment, textile industry wastewater treatment, etc., can solve the problems of increased treatment cost, increased flushing water consumption, slow treatment speed, etc., to protect economic income, The effect of reducing salt consumption and reducing emissions

Active Publication Date: 2019-10-25
SHIHEZI UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the salt content of the wastewater is higher than a certain value, it will quickly reach the exchange saturation capacity of the resin, and a large amount of regeneration agent will be consumed, and the amount of flushing water will also increase, which will increase the treatment cost and make the operation cumbersome.
Membrane separation technology uses a special membrane to selectively permeate certain components in the liquid to separate, but there are problems such as high membrane cost and slow processing speed.

Method used

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  • Preparation method of low-residue flocculant in wastewater and wastewater recycling method
  • Preparation method of low-residue flocculant in wastewater and wastewater recycling method
  • Preparation method of low-residue flocculant in wastewater and wastewater recycling method

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Embodiment 1

[0058] Embodiment 1: The embodiment of the present invention discloses a method for preparing a low-residue flocculant in wastewater, which includes the following steps:

[0059] Step a: Synthesize polymer modified starch environment-responsive flocculant intermediate 2,4-bis(diethylamino)-6-chloro-[1,3,5]-triazine, the specific steps are as follows:

[0060] Add 0.08mol of cyanuric chloride and 75mL of water at 5°C to a 250mL three-necked round-bottomed flask equipped with a dropping funnel, and keep the temperature at 5°C; Add a 0.16mol diethylamine aqueous solution with a mass concentration of 99% at 20°C; heat up to 50°C after reacting for 30 minutes, and add dropwise a 99% diethylamine aqueous solution with a mass concentration of 50°C again, to complete the reaction of cyanuric chloride. End point (detected by thin-layer chromatography [developing agent: V (ethyl acetate): V (petroleum ether) = 1:10]); After the reaction, the product was refrigerated at 5° C. for 12 hour...

Embodiment 2

[0065] Embodiment 2: The embodiment of the present invention discloses a kind of low residue flocculant in waste water again, and its preparation method comprises the following steps:

[0066] Step a: Synthesize polymer modified starch environment-responsive flocculant intermediate 2,4-bis(diethylamino)-6-chloro-[1,3,5]-triazine, the specific steps are as follows:

[0067] Add 0.08mol of cyanuric chloride and 75mL of water at 5°C to a 250mL three-necked round-bottomed flask equipped with a dropping funnel, and keep the temperature at 5°C; Add a 0.16mol diethylamine aqueous solution with a mass concentration of 99% at 20°C; heat up to 50°C after reacting for 30 minutes, and add dropwise a 99% diethylamine aqueous solution with a mass concentration of 50°C again, to complete the reaction of cyanuric chloride. End point (detected by thin-layer chromatography [developing agent: V (ethyl acetate): V (petroleum ether) = 1:10]); After the reaction, the product was refrigerated at 5° ...

Embodiment 3

[0079] Embodiment 3: The embodiment of the present invention discloses a method for preparing a low-residue flocculant in wastewater, which includes the following steps:

[0080] Step a: Synthesize polymer modified starch environment-responsive flocculant intermediate 2,4-bis(diethylamino)-6-chloro-[1,3,5]-triazine, the specific steps are as follows:

[0081] Add 0.075mol of cyanuric chloride and 80mL of water at 4°C to a 250mL three-necked round-bottomed flask equipped with a dropping funnel, and keep the temperature at 4°C; Add 0.13mol diethylamine aqueous solution with a mass concentration of 99% at 22°C; heat up to 55°C after reacting for 35 minutes, and add dropwise an aqueous solution of diethylamine with a mass concentration of 99% at 55°C again, to complete the reaction with cyanuric chloride. End point (detected by thin-layer chromatography [developing agent: V (ethyl acetate): V (petroleum ether) = 1:10]); After the reaction, the product was refrigerated at 4 ° C for...

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Abstract

The invention discloses a preparation method of a low-residue flocculant in wastewater and a wastewater recycling method. The flocculant preparation method comprises the following steps: a, synthesizing an environment response flocculant intermediate; b, synthesizing a temperature stimulation response starch; and c, synthesizing a temperature / pH value stimulation response starch. The preparation method has the beneficial effects that the flocculant prepared by using the preparation method is capable of effectively treating industrial printing and dyeing wastewater with a dye, meanwhile, a trace amount of the flocculant left in salt-containing clean water can be further removed by changing temperatures and pH values of the salt-containing clean water after flocculation decoloring, then purehigh-concentration salt-containing clean water can be obtained, the obtained high-concentration salt-containing clean water can be further recycled into a dyeing process, circulation of industrial dye wastewater can be achieved, and by adopting a circulation dyeing method, the amount of a salt in dyeing can be greatly reduced, meanwhile, emission of water and wastewater can be reduced, and both environment protection and economic benefits can be taken into account.

Description

technical field [0001] The invention relates to the technical field of printing and dyeing wastewater treatment, in particular to a method for preparing a low-residue flocculant in wastewater and a method for recycling wastewater. Background technique [0002] Printing and dyeing wastewater is wastewater discharged from printing and dyeing factories that mainly process cotton, hemp, chemical fibers and their blended products. Printing and dyeing wastewater has a large amount of water, and each ton of textiles consumed by printing and dyeing consumes 100-200 tons of water, of which 80-90% becomes wastewater. Textile printing and dyeing wastewater has the characteristics of large water volume, high content of organic pollutants, high alkalinity, and large changes in water quality. It is one of the most difficult industrial wastewater to treat. Inorganic salts (sodium chloride or sodium sulfate) and alkaline agents (sodium carbonate) need to be added during the dyeing process ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B31/12C02F1/56C02F103/30
CPCC02F1/56C02F2103/30C08B31/125
Inventor 史玉琳王开祥徐益升魏婷婷陈龙
Owner SHIHEZI UNIVERSITY