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Efficient composite absorbing and flocculating agent used for printing and dyeing waste water treatment, preparation method thereof and applications thereof

A printing and dyeing wastewater and composite adsorption technology, which is applied in the direction of adsorption water/sewage treatment, flocculation/sedimentation water/sewage treatment, chemical instruments and methods, etc., can solve the problems of adsorption and decolorization, and achieve a small amount of residual sludge and low cost. The effect of low cost and simple preparation process

Inactive Publication Date: 2014-02-12
SHANGHAI NAT ENG RES CENT FORNANOTECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pure aluminum flocculants are poor in adsorption and decolorization. Therefore, it is considered to introduce high-efficiency adsorbents and coagulants into aluminum-based flocculants to complement each other with adsorption and flocculation, and the compound has strong adsorption and flocculation capabilities. efficient adsorption flocculant

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Dissolve 125 grams of aluminum potassium sulfate in 1 liter of water to make a solution, add 20 grams of powdered activated carbon between 200 and 300 mesh and 5 grams of lanthanum nitrate to the solution of aluminum potassium sulfate, in a constant temperature magnetic stirrer, at 200 rpm Stir for 15 minutes, add 25% ammonium hydroxide solution under stirring condition, stir for 5 minutes, let stand for compound reaction for 2 hours, and obtain high-efficiency composite adsorption flocculant.

[0022] Add sodium hydroxide dropwise to 1 liter of printing and dyeing wastewater to adjust the pH to 6, add 25 ml of high-efficiency composite adsorption flocculant, stir for 2 minutes, and let stand for 20 minutes. The settling time of the flocs was determined to be 6 minutes, the CODcr removal rate was 88.7%, and the decolorization rate was 95.3%.

Embodiment 2

[0024] Dissolve 150 grams of aluminum potassium sulfate in 1 liter of water to make a solution, add 30 grams of powdered activated carbon between 300 and 400 mesh and 6 grams of cerium nitrate to the solution of aluminum potassium sulfate, in a constant temperature magnetic stirrer, at 200 rpm Stir for 20 minutes, and add 25% ammonium hydroxide solution under stirring condition, stir for 10 minutes, and let stand for compound reaction for 4 hours to obtain high-efficiency composite adsorption flocculant.

[0025] Add calcium hydroxide dropwise to 1 liter of printing and dyeing wastewater to adjust the pH to 7, add 30 ml of high-efficiency composite adsorption flocculant, stir for 2 minutes, and let stand for 30 minutes. The settling time of the flocs was determined to be 5 minutes, the CODcr removal rate was 89.1%, and the decolorization rate was 95.6%.

Embodiment 3

[0027] Dissolve 125 grams of aluminum potassium sulfate in 1 liter of water to make a solution, add 25 grams of powdered activated carbon between 200 and 300 mesh and 5 grams of neodymium chloride to the solution of aluminum potassium sulfate, in a constant temperature magnetic stirrer, at 200 rpm Stir for 15 minutes per minute, add 25% ammonium hydroxide solution under stirring conditions, stir for 10 minutes, and let it stand for 2 hours for composite reaction to obtain a high-efficiency composite adsorption flocculant.

[0028] Add sodium hydroxide dropwise to 1 liter of printing and dyeing wastewater to adjust the pH to 6, add 30 ml of high-efficiency composite adsorption flocculant, stir for 2 minutes, and let stand for 20 minutes. The settling time of the flocs was determined to be 9 minutes, the CODcr removal rate was 86.7%, and the decolorization rate was 94.3%.

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Abstract

The invention discloses an efficient composite absorbing and flocculating agent used for printing and dyeing waste water treatment, a preparation method thereof and applications thereof. The efficient composite absorbing and flocculating agent comprises a flocculating agent, an absorbing agent and a coagulant aid. The flocculating agent is aluminium potassium sulfate. The absorbing agent is powder active carbon. The coagulant aid is a soluble rare earth salt. A concrete preparation process includes preparing the aluminium potassium sulfate into a solution having a concentration of 10%-20%; adding the active carbon and the rare earth salt into the aluminium potassium sulfate solution according to a weight ratio of 0.2-2:0.5-0.8:1 of the active carbon, the rare earth and aluminum; at a temperature of 50-70 DEG C, adding a alkali solution according to a weight ratio of 5-20:1 of the aluminium potassium sulfate to the alkali; performing a composite reaction for 2-4 h to obtain the efficient composite absorbing and flocculating agent. The efficient composite absorbing and flocculating agent has simple preparation, using convenience and a rapid precipitating speed, and can be used for the printing and dyeing waste water treatment with a high CODcr removing rate and a high decolourization ratio.

Description

technical field [0001] The invention relates to a composite adsorption flocculant, its preparation method and application, in particular to a composite adsorption flocculant for printing and dyeing wastewater treatment, its preparation method and application. Background technique [0002] With the rapid development of my country's printing and dyeing industry, a series of environmental problems have also emerged, one of which is the generation of a large amount of printing and dyeing wastewater. Since the whole process of dyeing and finishing requires a large amount of water for transportation, washing, dispersing materials and cooling equipment, etc., the amount of wastewater generated is large, generally reaching 70% to 90% of the water consumption of printing and dyeing enterprises. According to statistics, in 2010, the textile printing and dyeing industry discharged 12.75 tons of wastewater, ranking fifth in the national industrial wastewater discharge, accounting for ab...

Claims

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Application Information

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IPC IPC(8): C02F1/52C02F1/28B01J20/20B01J20/30
Inventor 董亚梅王婷何丹农
Owner SHANGHAI NAT ENG RES CENT FORNANOTECH
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