Preparation method of activated sludge mercury ion adsorbent

A technology of activated sludge and mercury ions, applied in sludge treatment, chemical instruments and methods, adsorption water/sewage treatment, etc., to achieve high efficiency, excellent micro/trace mercury ion adsorption performance, and stabilize resource utilization

Inactive Publication Date: 2012-05-23
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] At present, there are no public literature reports and patent applications about a preparation method of mercury ion adsorbent made from activated sludge at home and abroad.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]With isophorone diisocyanate, adipic acid polyester polyol, 2,2'-dimethylol propionic acid, dibutyltin dilaurate and acetone in a ratio of 100:360:40:2:400 (by weight) The proportion is mixed evenly, and the temperature is raised to 60°C for 8 hours to make the reaction tend to be completed, that is, the isocyanate-terminated polyurethane prepolymer is obtained; then the isocyanate-terminated polyurethane prepolymer, 1,4-butanediol, dibutyltin di Lauric acid ester and acetone, in the ratio of 100:12:1:100 (weight), stir evenly, control the temperature at about 60°C, continue the reaction for 5 hours, lower the temperature to 45°C, add 3g of triethylamine, and react for 30 minutes . Measure 125ml of deionized water and slowly add it dropwise to the above mixture, keeping the entire dropping time for 45 minutes. After the dropwise addition was completed, the reaction was continued for another 30 minutes. After removing the acetone under vacuum at 35°C, an aqueous polyure...

Embodiment 2

[0030] With isophorone diisocyanate, adipic acid polyester polyol, 2,2'-dimethylol propionic acid, dibutyltin dilaurate and acetone in a ratio of 100:360:30:2:400 (by weight) The proportion is mixed evenly, and the temperature is raised to 60°C for 8 hours to make the reaction tend to be completed, that is, the isocyanate-terminated polyurethane prepolymer is obtained; then the isocyanate-terminated polyurethane prepolymer, 1,4-butanediol, dibutyltin di Laurate and acetone, with the ratio of 100:12:1:100 (weight), stir evenly, the temperature is controlled at about 60°C, the reaction continues for 5 hours, the temperature is reduced to 45°C, add 2.5g triethylamine, react for 30 minute. Measure 125ml of deionized water and slowly add it dropwise to the above mixture, keeping the entire dropping time for 45 minutes. After the dropwise addition was completed, the reaction was continued for another 30 minutes. After removing the acetone under vacuum at 35°C, an aqueous polyureth...

Embodiment 3

[0034] With isophorone diisocyanate, adipic acid polyester polyol, 2,2'-dimethylol propionic acid, dibutyltin dilaurate and acetone in a ratio of 100:250:40:3:400 (by weight) The proportion is mixed evenly, and the temperature is raised to 60°C for 8 hours to make the reaction tend to be completed, that is, the isocyanate-terminated polyurethane prepolymer is obtained; then the isocyanate-terminated polyurethane prepolymer, 1,4-butanediol, dibutyltin di Lauric acid ester and acetone, in the ratio of 100:20:1:120 (weight), stir well, the temperature is controlled at about 60°C, the reaction lasts for 5 hours, the temperature is lowered to 45°C, add 3.5g triethylamine, react for 30 minute. Measure 125ml of deionized water and slowly add it dropwise to the above mixture, keeping the entire dropping time for 45 minutes. After the dropwise addition was completed, the reaction was continued for another 30 minutes. After removing the acetone under vacuum at 35°C, an aqueous polyure...

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Abstract

The invention belongs to the technical field of wastewater treatment in an environmental protection industry, in particular to a preparation method of an activated sludge mercury ion adsorbent, comprising the following steps of: firstly mixing water and a volatile non-aqueous solvent into a mixed solvent, introducing a chloromethylthioirane monomer into an aqueous polyurethane dispersion emulsionby using a chemical bonding method to obtain a sulfydryl-containing aqueous polyurethane emulsion, then blending the sulfydryl-containing aqueous polyurethane emulsion and activated sludge for composite modification, and finally carrying out centrifugal dehydration and vacuum drying to obtain the activated sludge mercury ion adsorbent. The activated sludge mercury ion adsorbent prepared by the invention has excellent high-concentration mercury ion adsorption (greater than 90%) and excellent micro/trace mercury ion adsorption (greater than 95%). The method has the advantages of simple process, low cost and high efficiency, is beneficial to environmental protection, and has higher economic and social benefits when used for treating the activated sludge and industrial wastewater.

Description

technical field [0001] The invention belongs to the technical field of waste water treatment in the environmental protection industry, and in particular relates to a preparation method of a mercury ion adsorbent made from activated sludge. Background technique [0002] Mercury is widely used in industrial fields such as papermaking, paint, cosmetics, preservatives, thermometers, pressure gauges, fluorescent lamps and batteries. At the same time, mercury will also bring a serious environmental pollution problem. Among all industrial heavy metal wastewater discharges, mercury is a pollutant that has the greatest impact on the environment. It is estimated that the newly increased mercury pollution from nature, man-made and ocean sprays is as high as 5,500 tons every year in the world. Therefore, the treatment of mercury-containing wastewater is directly related to human physical and mental health. How to efficiently deal with mercury has become an extremely important problem f...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/26B01J20/30C02F11/00C02F1/28C02F1/62
Inventor 杨正龙
Owner TONGJI UNIV
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