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A kind of water dispersion type diatomite composite flocculation dehydrating agent and its application

A diatomaceous earth and dispersive technology, applied in water/sludge/sewage treatment, dehydration/drying/thickened sludge treatment, chemical instruments and methods, etc., can solve problems such as product flocculation performance decline

Active Publication Date: 2020-12-08
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In these technical methods, diatomaceous earth only acts as a filler or adsorption material in the system, and while reducing the cost of the flocculant, it inevitably leads to a decline in the flocculation performance of the product.

Method used

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  • A kind of water dispersion type diatomite composite flocculation dehydrating agent and its application
  • A kind of water dispersion type diatomite composite flocculation dehydrating agent and its application
  • A kind of water dispersion type diatomite composite flocculation dehydrating agent and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In an aqueous sodium chloride solution with a mass concentration of 25%, poly(dimethyldiallyl ammonium chloride) with a molecular weight of 250,000 is used as a dispersion stabilizer, and zwitterionic monomers (acrylic acid and acryloyloxyethyl Trimethylammonium chloride) and acrylamide are dropped into the reaction flask in a ratio (molar ratio) of 1:2, wherein the ratio of acrylic acid and acryloyloxyethyl trimethylammonium chloride is 1:1 (molar ratio), Add water, add diatomite (the addition of diatomite is 25% of the total mass of the monomer), adjust its mass concentration to be 22.6%; then add the initiator ammonium persulfate of 0.1% of the monomer mass to carry out Free radical copolymerization, the polymerization time is 12 hours, and a white milky dispersion is obtained, that is, a water-dispersible diatomite composite flocculation dehydrating agent.

[0052] The product prepared in this embodiment is treated with papermaking sludge with a solid content of 2.4...

Embodiment 2

[0060] In an aqueous potassium chloride solution with a mass concentration of 40%, poly(vinylpyrrolidone) with a molecular weight of 450,000 is used as a dispersion stabilizer, and zwitterionic monomers (methacrylic acid and methacryloxyethyl trimethyl Ammonium chloride) and acrylamide are dropped into the reaction flask in a ratio (molar ratio) of 1:5, wherein the ratio of methacrylic acid and methacryloyloxyethyltrimethylammonium chloride is 1:2.2 (molar ratio) , add water, add diatomite (the add-on of diatomite is 40% of monomer total mass), adjust its mass concentration to be 30.5%; Then add the initiator ammonium persulfate of monomer mass 0.5% at 50 ℃ Carry out free radical copolymerization, and the polymerization time is 8 hours, to obtain a white milky dispersion, that is, a water-dispersible diatomite composite flocculation dehydrating agent.

[0061] The product prepared in this embodiment is 3.0% (percentage by weight) of the leather sludge with a solid content of 3...

Embodiment 3

[0063] In an aqueous ammonium sulfate solution with a mass concentration of 30%, poly(methacryloyloxyethyltrimethylammonium chloride) with a molecular weight of 800,000 was used as a dispersion stabilizer, and zwitterionic monomers (acrylic acid and acryloyloxy Ethyl benzyl ammonium chloride) and acrylamide are dropped into the reaction flask in a ratio (molar ratio) of 1:8, wherein the ratio of methacrylic acid and methacryloyloxyethyl benzyl ammonium chloride is 1:3.5 ( mol ratio), add water, add diatomite (the addition of diatomaceous earth is 15% of monomer gross mass), adjust its mass concentration to be 18%; Then add the initiator ammonium persulfate of monomer quality 2% in Carry out radical copolymerization at 60°C for 10 hours to obtain a white milky dispersion, that is, a water-dispersible diatomite composite flocculating dehydrating agent.

[0064] The product prepared in this embodiment is 3.0% (percentage by weight) of the leather sludge with a solid content of 3....

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Abstract

The invention provides a water-dispersed diatomite composite flocculation dehydrating agent and its application. The dehydrating agent is prepared by the following method: in an inorganic salt aqueous solution medium, a cationic polymer or a nonionic polymer is used as a dispersion stabilizer, and the Water-soluble anionic monomers, water-soluble cationic monomers, acrylamide and diatomite carry out in-situ free radical graft copolymerization under an initiator to obtain a dispersed diatomite composite flocculation dehydrating agent. The dehydrating agent dissolves quickly, fully dissolves, and has a small initial viscosity, so that it has a high dehydration effect; it can realize sludge dehydration reduction operation; the high diatomite content can significantly reduce product costs and improve market competitiveness. The sludge specific resistance in the process of sludge dewatering changed from 2.82×10 13 ~4.15×10 13 m / kg down to 1.17×10 12 ~8.37×10 12 m / kg, the capillary washing time dropped from 124 to 158s to 11.2 to 22.4s.

Description

technical field [0001] The invention relates to the technical field of dehydrating agents, in particular to a water-dispersed diatomite composite flocculation dehydrating agent and its application. Background technique [0002] Sludge dehydration treatment is an important link in urban domestic sewage and industrial and agricultural wastewater treatment projects. The volume of secondary sludge after dehydration is reduced, which not only reduces the secondary pollution to the environment, but also creates a great opportunity for the comprehensive utilization of sludge resources. Favorable conditions. With the acceleration of my country's urbanization process and stricter sludge discharge standards, especially after the introduction of the "Water Ten Regulations", the demand for sludge dehydrating agents and other water treatment chemicals has increased significantly. According to the government plan, the sewage treatment rate of cities with a population of more than 500,000...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/56C08F271/00C08F220/06C08F220/34C08F271/02C08F265/04C02F11/147
CPCC02F11/14C08F265/04C08F271/00C08F271/02C08F220/06C08F220/34C08F220/56
Inventor 徐昆谭颖王丕新张文德裴晓鹏邓裕坤翟侃侃梁学称
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI