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Water-dispersed diatomite composite flocculating dehydrating agent and application thereof

A diatomite, dispersing technology, applied in the direction of dehydration/drying/concentrating sludge treatment, etc., can solve the problem of product flocculation performance decline and so on

Active Publication Date: 2018-05-29
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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  • Water-dispersed diatomite composite flocculating dehydrating agent and application thereof
  • Water-dispersed diatomite composite flocculating dehydrating agent and application thereof
  • Water-dispersed diatomite composite flocculating dehydrating agent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] In a sodium chloride aqueous solution with a mass concentration of 25%, poly(dimethyldiallylammonium chloride) with a molecular weight of 250,000 is used as a dispersion stabilizer, and zwitterionic monomers (acrylic acid and acryloxyethyl Trimethylammonium chloride) and acrylamide are put into the reaction flask at a ratio of 1:2 (molar ratio), in which the ratio of acrylic acid and acryloxyethyltrimethylammonium chloride is 1:1 (molar ratio), Add water, add diatomaceous earth (the amount of diatomaceous earth added is 25% of the total mass of the monomer), adjust its mass concentration to 22.6%; then add the initiator ammonium persulfate with 0.1% of the monomer mass and proceed at 50°C Free radical copolymerization, the polymerization time is 12 hours, to obtain a white milky dispersion, that is, a water-dispersed diatomite composite flocculating dehydrating agent.

[0052] The product prepared in this example is used to treat papermaking sludge with a solid content of ...

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 put into the reaction flask at a ratio of 1:5 (molar ratio), wherein the ratio of methacrylic acid and methacryloxyethyl trimethylammonium chloride is 1:2.2 (molar ratio) , Add water, add diatomaceous earth (the amount of diatomaceous earth added is 40% of the total mass of the monomer), adjust its mass concentration to 30.5%; then add 0.5% of the monomer mass of initiator ammonium persulfate at 50°C Carry out free radical copolymerization, and the polymerization time is 8 hours, to obtain a white milky dispersion, that is, a water-dispersed diatomite composite flocculating dehydrating agent.

[0061] The product prepared in this example is used to treat leather sludge with a solid content of 3...

Embodiment 3

[0063] In an aqueous solution of ammonium sulfate with a mass concentration of 30%, poly(methacryloxyethyltrimethylammonium chloride) with a molecular weight of 800,000 is used as a dispersion stabilizer, and zwitterionic monomers (acrylic acid and acryloxy Ethyl benzyl ammonium chloride) and acrylamide were put into the reaction flask at a ratio of 1:8 (molar ratio), in which the ratio of methacrylic acid and methacryloxyethyl benzyl ammonium chloride was 1:3.5 ( Molar ratio), add water, add diatomaceous earth (the amount of diatomaceous earth added is 15% of the total mass of the monomer), adjust its mass concentration to 18%; then add 2% of the monomer mass of the initiator ammonium persulfate to Free radical copolymerization is carried out at 60°C, and the polymerization time is 10 hours, to obtain a white milky dispersion, that is, a water-dispersed diatomite composite flocculating dehydrating agent.

[0064] The product prepared in this example is used to treat leather slud...

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Abstract

The invention provides a water-dispersed diatomite composite flocculating dehydrating agent and application thereof. A preparation method of the dehydrating agent comprises the step of carrying out in-situ free radical graft copolymerization on water-soluble anionic monomers, water-soluble cationic monomers, acrylamide and diatomite in presence of an initiator in an inorganic salt solution mediumby taking a cationic polymer or a non-ionic polymer as a dispersion stabilizer so as to obtain the water-dispersed diatomite composite flocculating dehydrating agent. The water-dispersed diatomite composite flocculating dehydrating agent is rapid in dissolution velocity, full in dissolution and low in initial viscosity, thus having a higher dehydration effect; after the dehydrating agent is used,a sludge dehydration reduction operation can be realized; due to the higher content of the diatomite, the product cost is significantly reduced, and the market competitiveness is further improved. Ina sludge dewatering process, the specific resistance of sludge is reduced to 1.17*10<12>-8.37*10<12> m / kg from 2.82*10<13> to 4.15*10<13> m / kg, and the capillary washing time is reduced to 11.2-22.4sfrom 124-158s.

Description

Technical field [0001] The invention relates to the technical field of dehydrating agents, in particular to a water-dispersed diatomite composite flocculating dehydrating agent and applications thereof. Background technique [0002] Sludge dewatering is an important link in the treatment of urban domestic sewage and industrial and agricultural wastewater. The volume of the secondary sludge after dehydration is reduced, which not only reduces the secondary pollution to the environment, but also contributes to the comprehensive utilization of sludge resources. Favorable conditions. With the acceleration of my country's urbanization process and the stricter sludge discharge standards, especially after the introduction of the "Water Ten", the demand for sludge dehydrating agents and other water treatment chemicals has increased substantially. According to government planning, the sewage treatment rate of cities with a population of more than 500,000 should reach 60%, and the sewage ...

Claims

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Application Information

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IPC IPC(8): C02F11/14C08F271/00C08F220/06C08F220/34C08F220/56C08F271/02C08F265/04
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
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