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Preparation method of sludge conditioner

A technology for sludge conditioning and preparation steps, which is applied in the field of sludge conditioner preparation, which can solve the problems of monomeric acrylamide toxicity and poor degradation, and achieve good water solubility, strong adsorption performance, and increase the relative molecular weight.

Inactive Publication Date: 2020-04-17
周雯
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention: for the existing sludge conditioning method, the most widely used flocculant is to add polyacrylamide, which has unavoidable defects such as poor degradability and toxicity of monomeric acrylamide. Provided is a preparation method of sludge conditioner

Method used

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  • Preparation method of sludge conditioner

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Effect test

Embodiment 1

[0029] Mix sulfonated lignin and 20% sodium hydroxide solution at a mass ratio of 1:5, and disperse ultrasonically for 5 minutes to obtain a mixed solution. Centrifuge the mixed solution at a speed of 3000 r / min for 20 minutes, and collect the supernatant. Use a 10% hydrochloric acid solution to adjust the pH of the supernatant to 2, and heat it at 90°C for 40 minutes to obtain the matrix liquid. After the matrix liquid is allowed to stand for 6 hours, suction filter to obtain the filter residue. Wash the filter residue with ion water until it is neutral, place it in an oven at 50°C, dry it to constant weight, and cool it to room temperature to obtain the pretreated lignin; weigh 1 part of pretreated lignin, 1 part of sodium thiosulfate, 5 parts of acrylic acid, 1 part of potassium persulfate, 90 parts of mass fraction are 25% sodium hydroxide solution, the pretreated lignin and mass fraction are mixed with 25% sodium hydroxide solution, and the stirring speed is Stir at 300r / ...

Embodiment 2

[0031] Mix sulfonated lignin and 20% sodium hydroxide solution at a mass ratio of 1:5, disperse ultrasonically for 7 minutes to obtain a mixed solution, centrifuge the mixed solution at a speed of 3500 r / min for 25 minutes, and collect the supernatant. Use a 10% hydrochloric acid solution to adjust the pH of the supernatant to 2.5, and heat it at 95°C for 50 minutes to obtain the matrix liquid. After standing the matrix liquid for 7 hours, suction filter to obtain the filter residue. Wash the filter residue with ion water until neutral, dry it in an oven at 55°C to constant weight, and cool to room temperature to obtain pretreated lignin; weigh 5 parts of pretreated lignin, 2 parts of sodium thiosulfate, 10 parts of acrylic acid, 2 parts of potassium persulfate, 95 parts of mass fraction are 25% sodium hydroxide solution, the pretreated lignin and mass fraction are mixed with 25% sodium hydroxide solution, and the stirring speed is Stir at 350r / min for 13min to obtain the reac...

Embodiment 3

[0033] Mix sulfonated lignin and 20% sodium hydroxide solution at a mass ratio of 1:5, and disperse ultrasonically for 10 minutes to obtain a mixed solution. Centrifuge the mixed solution at a speed of 4000 r / min for 30 minutes, and collect the supernatant. Use a 10% hydrochloric acid solution to adjust the pH of the supernatant to 3, and heat it at 100°C for 60 minutes to obtain the matrix liquid. After standing the matrix liquid for 8 hours, suction filter to obtain the filter residue. Wash the filter residue with ion water until neutral, dry it in an oven at 60°C to constant weight, and cool to room temperature to obtain pretreated lignin; weigh 10 parts of pretreated lignin, 3 parts of sodium thiosulfate, 15 parts of acrylic acid, 3 parts of potassium persulfate, 100 parts of mass fraction are 25% sodium hydroxide solution, the pretreated lignin and mass fraction are mixed with 25% sodium hydroxide solution, and the stirring speed is Stir at 400r / min for 15min to obtain th...

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Abstract

The invention relates to a preparation method of a sludge conditioner, which belongs to the technical field of sewage treatment. The sulfonated lignin grafted sodium acrylate copolymer is used as a raw material, a magnesium oxide modified zeolite molecular sieve is used as a carrier, and the sulfonated lignin grafted sodium acrylate copolymer is fixed on the carrier to prepare the sludge conditioner. The sulfonated lignin grafted sodium acrylate copolymer has the intermolecular force and reactivity of a polysaccharide compound; the mechanical and biological action stability and the linear chain expansion capability of synthetic macromolecules are also realized; sulfonated lignin contains a large number of -SO3H groups and has strong anionic property and strong hydrophilicity, a sodium acrylate copolymer is used as a graft comonomer, the spatial configuration of lignin is changed, the relative molecular mass is increased, functional groups with flocculation performance are introduced, and the flocculation performance of lignin is further improved.

Description

technical field [0001] The invention relates to a preparation method of a sludge conditioner, belonging to the technical field of sewage treatment. Background technique [0002] In recent years, with the rapid development of my country's sewage treatment industry, the sewage treatment capacity and treatment rate have been continuously improved, and the output of surplus sludge has also increased. Municipal sludge has two sides. On the one hand, sludge contains nutrients such as N, P, and K and a large amount of organic matter, which makes it have the basic conditions for agriculture, fertilizer making and resource utilization as fuel; on the other hand, it also contains a large number of pathogenic bacteria. , parasites (eggs), biodegradable substances (polybiphenyls, etc.), toxic and harmful substances (dioxins) and various heavy metals (Cu, Hg, Pb), etc. If the sludge can be properly disposed of, waste can be turned into treasure and resource recycling can be realized. Fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/147
CPCC02F11/147
Inventor 周雯
Owner 周雯
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