Aqueous high molecular polymer, coagulated dehydrant for sludge and sludge coagulating method

A water-soluble polymer and polymer technology, applied in the direction of dewatering/drying/concentrating sludge treatment, etc., can solve the problems of corrosion of manufacturing equipment, production of dioxins, insufficient performance of sludge filter cake, etc., and improve the cohesion performance. , the effect of improving work efficiency, improving cohesion performance or peeling performance

Active Publication Date: 2008-09-10
MITSUBISHI CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, the above-mentioned water-soluble high molecular polymers that have been used so far are formed by adding the water-soluble high molecular polymers to water in which organic sludge and the like are suspended, and the organic sludge and the like are aggregated to form lumps that are easily separated from solid and liquid. However, since the strength of the coagulated flocs is relatively weak, there are problems such as insufficient performance of the sludge filter cake from the filter cloth.
[0008] In addition, as a cationic coagulation dehydrating agent, in the case of using a dehydrating agent of hydrochloride of N,N-dialkylaminoalkyl (meth)acrylate, since a strong acid such as hydrochloric acid is used, there is a gap in the production facility. Corrosion problems and issues that require attention to careful handling
[0009] Furthermore, most of the sludge cake generated by dehydration is eventually incinerated. However, when hydrochloride is used as a cationic coagulation dehydrating agent, there is a problem that dioxins may be generated by incineration.

Method used

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  • Aqueous high molecular polymer, coagulated dehydrant for sludge and sludge coagulating method
  • Aqueous high molecular polymer, coagulated dehydrant for sludge and sludge coagulating method
  • Aqueous high molecular polymer, coagulated dehydrant for sludge and sludge coagulating method

Examples

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Embodiment

[0083] The following examples illustrate the present invention, but the present invention is not limited by these examples.

[0084] In addition, in the following examples, N,N-dimethylaminoethyl methacrylate tertiary amine citrate is recorded as DM citrate, and N,N-dimethylaminoethyl methacrylate tertiary Amine malate is recorded as DM malate, methacrylic acid N,N-dimethylaminoethyl ester tertiary amine hydrochloride is recorded as DM hydrochloride, methacrylic acid N,N-diethylaminoethyl The ester tertiary amine citrate is recorded as DE citrate, the methacrylic acid N,N-diethylaminoethyl ester tertiary amine malate is recorded as DE malate, and the methacrylic acid N,N-diethyl Aminoethyl ester tertiary amine hydrochloride is denoted as DE hydrochloride, acrylamide is denoted as AAm, acrylic acid is denoted as AAc, and 2-acrylamidopropanesulfonic acid is denoted as ATBS.

[0085] (Measurement method of infrared spectrophotometry)

[0086] The measurement was carried out usi...

Synthetic example 1

[0110] Add 520.6g (3.316mol) N,N-dimethylaminoethyl methacrylate, 212.2g (1.105mol) citric acid, 26.1g (0.368mol) acrylamide, 1.52g thiourea to 279.5g deionized water successively , 0.076g polyoxyalkylene alkyl ether (HLB value is about 11), 0.049g sodium hypophosphite, and stir, synthesized the mixture of DM citrate monomer and AAm that solid content concentration is 73.0% (composition ratio is 90 mol%: 10 mol%). Table 1 shows the amount of raw materials used.

Synthetic example 2

[0112] Using the same method as in Synthesis Example 1, a mixture of DM citrate monomer and AAm (composition ratio: 40 mol %: 60 mol %) having a solid content concentration of 70.0 % was synthesized. Table 1 shows the amount of raw materials used.

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Abstract

The present invention provides a water-soluble polymer which can be used as a coagulating and dehydrating agent that does not corrode production facilities, does not raise concern of generating a dioxin or the like even when it is burned, and has good stripping performance for stripping a sludge cake from a filter cloth. The water-soluble polymer is prepared by copolymerization of a tertiary amine saturated carboxylate monomer and a water-soluble monomer having an [alpha], [beta]-unsaturated double bond. The tertiary amine saturated carboxylate monomer is obtained by reacting a saturated carboxylic acid having two or more carboxylic acid groups in a molecule with an N, N-dialkylaminoalkyl (meth)acrylate in an amount equivalent to the carboxylic acid groups of the saturated carboxylic acid.

Description

technical field [0001] The invention relates to a water-soluble high molecular polymer, a coagulation dewatering agent for sludge and a sludge coagulation dehydration method. Background technique [0002] Organic sludge such as excess sludge and coagulated sludge is produced by biological treatment of sewage, excrement, or various industrial wastewater. Hitherto, cationic polymers have been used alone in the dehydration treatment of these sludges. The cohesion of the cationic high molecular polymer is poor, so the amount of sludge treatment is limited, or the treatment state cannot meet the requirements in terms of moisture content of the dewatered filter cake, SS recovery rate, performance of the filter cake peeling from the filter cloth, etc., so Desperately needs improvement. [0003] In order to solve these problems, various water-soluble polymers having a cationic coagulation and dehydration agent and an anionic coagulation and dehydration agent in the molecule have b...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F220/34C02F11/14
Inventor 平纲训
Owner MITSUBISHI CHEM CORP
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