JPH10137798A - Dehydrating agent for sewage mixed raw sludge and its production - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enhance the efficiency of dehydration of sewage mixed raw sludge by using a mixture of a prescribed polymer contg. a water-soluble cationic vinyl monomer represented by a specified formula with a hydrophilic surfactant. SOLUTION: Monomers including a water-soluble cationic vinyl monomer represented by the formula or its mixture are subjected to reverse phase emulsion polymn. in the presence of a chain transfer agent and the resultant polymer is mixed with a hydrophilic surfactant to obtain the objective dehydrating agent forming particles each having <=30μm particle diameter observed with a microscope when it is diluted with water to a concn. fit for addition to sludge and forming a continuous dry film when the prepd. diluted soln. is applied to a glass plate and dried at 105 deg.C. In the formula, A is O or NH, B is C2 H4 , C3 H6 or C3 H5 OH, R1 is H or CH3 , each of R2 and R3 is a 1-4C alkyl, R4 is H, a 1-4C alkyl or benzyl and X<-> is an anionic counter ion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a sludge dewatering agent comprising a crosslinked polymer, and the sludge dewatering agent of the present invention is effective for dewatering sewage mixed raw sludge.

[0002]

2. Description of the Related Art Various sludge dewatering agents and sludge dewatering methods have been known. For example, a sludge dewatering method in which an amphoteric polymer flocculant is added to an organic sludge having a sludge PH of 5 to 8 after addition of an inorganic flocculant (JP-A-63-15820)
No. 0) is known. Further, in order to improve the disadvantages of the conventional polymer flocculants, a crosslinked cationic / anionic / nonionic organic polymer composition (European Patent No. 0,202,780; 61-29
No. 3510, JP-A-64-85199, JP-A-2-219878, JP-A-4-226102, etc.) have been proposed to be effective for various solid-liquid separations.

As a method for treating sewage, there is an activated sludge method. Excess sludge is generated from the activated sludge process. Sludge obtained by suspending suspended solids in sewage without chemical injection to reduce the load of the activated sludge method is called initial sludge, and a mixture of both is called mixed raw sludge.

[0004] With the recent change in sewage quality, dewatering of sewage-mixed raw sludge is becoming very difficult, and the conventional addition of a cationic polymer flocculant alone is unsatisfactory in dehydration. That is, when dewatering by filtration using a belt filter, a filter press, or the like is performed, the cake is poorly peeled off and adheres to the filter cloth.

[0005]

Conventionally known amphoteric polymers or cationic polymers are unsatisfactory in performance. In particular, with the recent sewage quality change, a method for efficiently dewatering sewage mixed raw sludge has not been known.

[0006]

According to the first aspect of the present invention, a water-soluble cationic vinyl monomer represented by the following formula (1) or a monomer containing a mixture thereof is used as a chain transfer agent. A mixture of a polymer obtained by performing inverse emulsion polymerization in the presence and a hydrophilic surfactant, in a state diluted with water to a concentration to be added to sludge, particles having a particle size of 30 μm or less are observed with a microscope. And a dewatering agent for sewage-mixed raw sludge, which has the property of forming a continuous dried film when the diluted solution is applied to a glass plate and dried by heating at 105 ° C.

Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. )

The invention of claim 2 of the present invention relates to (A) a water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof in an amount of 5 to 99.9999 mol% of all monomers;
(B) 0.0001 to 0.01 mol% of bifunctional monomer in all monomers, (C) 0 to 30 mol% of water-soluble anionic vinyl monomer or mixture thereof in all monomers , (D) a nonionic water-soluble monomer, (E) a chain transfer agent, (F) water,
(G) an oil consisting of at least one hydrocarbon, and (H) an inverse phase emulsion, that is, an amount effective to produce a water-in-oil emulsion, and at least one surfactant that is HLB. The components A) to (H) are mixed and stirred vigorously as needed to form fine monomer phase droplets in the oil phase, and then polymerized, mixed with a hydrophilic surfactant and diluted with water for use. A method for producing a dewatering agent for sewage-mixed raw sludge.

Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. )

The invention according to claim 3 of the present invention is characterized in that (A) 5 to 97.9999 mol% of the total monomers, a water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof:
(B) 0.0001 to 0.01 mol% of bifunctional monomer in all monomers, (C) 2 to 30 mol% of water-soluble anionic vinyl monomer or mixture thereof in all monomers , (D) a nonionic water-soluble monomer, (E) a chain transfer agent, (F) water,
(G) an oil comprising at least one hydrocarbon, and (H) an amount effective to produce a reversed-phase emulsion, ie, a water-in-oil emulsion, and at least one surfactant which is HLB. The components A) to (H) are mixed and stirred vigorously as needed to form fine monomer phase droplets in the oil phase, and then polymerized, mixed with a hydrophilic surfactant and diluted with water for use. The method for producing a dewatering agent for sewage-mixed raw sludge according to claim 2, characterized in that:

Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. )

According to a fourth aspect of the present invention, the nonionic water-soluble monomer is (meth) acrylamide, wherein the nonionic water-soluble monomer is a (meth) acrylamide. It is a manufacturing method.

According to a fifth aspect of the present invention, the water-soluble anionic vinyl monomer is (meth) acrylic acid. It is a manufacturing method of the agent.

The invention according to claim 6 of the present invention is characterized in that the bifunctional monomer is N, N'-methylenebisacrylamide or 2
6. The method for producing a dewatering agent for sewage-mixed raw sludge according to claim 2, which is hydroxypropylidene 1,3-bis [(N-acryloylaminopropyl) N, N-dimethylammonium chloride]. .

The invention according to claim 7 of the present invention is characterized in that the hydrophilic surfactant is a nonionic surfactant having an HLB of 9 to 15, and wherein the raw sewage mixed raw sludge according to claim 2 to 6, is used. This is a method for producing a dehydrating agent.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The above formula (1) used in the present invention
Specific examples of the water-soluble cationic vinyl monomer of the component (A) represented by the following formula are dialkylaminoalkyl (meth)
Tertiary and quaternary ammonium salts of acrylate, tertiary and quaternary ammonium salts of dialkylaminoalkyl (meth) acrylamide, tertiary and quaternary ammonium salts of dialkylaminohydroxyalkyl (meth) acrylate, dialkylaminohydroxyalkyl Examples thereof include one selected from tertiary and quaternary ammonium salts of (meth) acrylamide or a mixture thereof. Among them, one selected from acryloyloxyethyltrimethylammonium chloride, methacryloyloxyethyltrimethylammonium chloride, dimethylaminopropylacrylamide hydrochloride or a mixture thereof is preferably used.

Specific examples of the bifunctional monomer (B) used in the present invention include 2-hydroxypropylidene 1,
3-bis [(Nacryloylaminopropyl) N, N-dimethylammonium chloride], N, N'-methylenebisacrylamide, N, N'-methylenebismethacrylamide, divinyl compounds such as divinylbenzene, methylolacrylamide, methylolmethacrylamide, etc. Vinyl methylol compounds, vinyl aldehyde compounds such as acrolein, and mixtures thereof. Among them, 2-hydroxypropylidene 1,1
3bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] can be preferably used.
N'-methylenebisacrylamide is second to this.

Specific examples of the water-soluble anionic vinyl monomer (C) used in the present invention include (meth) acrylic acid, 2-acrylamido-2-methylpropanesulfonic acid, vinylsulfonic acid, and styrenesulfonic acid. Acid, itaconic acid, maleic acid, fumaric acid, arylsulfonic acid and salts thereof, or mixtures thereof.
Among these, acrylic acid can be most preferably used.

Specific examples of the water-soluble nonionic vinyl monomer (D) used in the present invention include (meth) acrylamide, vinyl methyl ether, vinyl ethyl ether and mixtures thereof. Among them, acrylamide is most preferably used.

Specific examples of the chain transfer agent of component (E) used in the present invention include alcohol, mercaptan, phosphite, sulfite, and mixtures thereof. The amount of the chain transfer agent added is such that particles having a particle size of 30 μm or less are observed with a microscope in a state where the organic polymer flocculant is diluted with water to a concentration at which the organic polymer flocculant is added to the sludge. At a temperature of 105 ° C. to form a continuous dry film.

Specific examples of the oil comprising at least one kind of hydrocarbon which is the component (G) used in the present invention include mineral oils such as kerosene, light oil and medium oil, and boiling points in the same range as these. Examples thereof include hydrocarbon-based synthetic oils having characteristics such as viscosity, and mixtures thereof.

The surfactant (H) used in the present invention is a nonionic surfactant having an HLB of 3 to 6,
Specific examples thereof include sorbitan monooleate, sorbitan monostearate, and sorbitan monopalmitate.

In the present invention, as the hydrophilic surfactant mixed with the polymer obtained by the water-in-oil emulsion polymerization, a cationic surfactant or a nonionic surfactant having an HLB of 9 to 15 is used. HLB1
0-14 nonionic surfactants are used. Representative examples of preferred nonionic surfactants include, for example, polyoxyethylene nonylphenyl ether.

The ratio of the bifunctional monomer (B) used in the present invention to the total amount of the polymerizable monomer is 0.0001.
-0.01 mol%, preferably 0.0002-0.00
It is desirable to copolymerize in the range of 3 mol%. 0.00
If it is less than 01 mol%, a sufficient network structure cannot be obtained, and excellent dehydration performance cannot be obtained. On the other hand, if the amount exceeds 0.01 mol%, a water-insoluble polymer is formed, and even if added to and mixed with sludge, a floc having good dewaterability cannot be obtained.

The polymer according to the present invention can be copolymerized by an essentially known polymerization method. For example, after mixing and emulsifying an aqueous solution containing a polymerizable vinyl monomer and a chain transfer agent and an organic dispersion medium containing a nonionic surfactant having an HLB of 3 to 6, in the presence of a radical polymerization initiator, Temperature 30 ~
A method for producing a water-in-oil cationic polymer emulsion by polymerizing at 80 ° C. is described in JP-A-61-236250, but this method is applied by changing the monomer composition by applying this method. The water-in-oil emulsion of the invention can be synthesized. A hydrophilic surfactant is added to this water-in-oil emulsion, mixed with water, phase-inverted to an oil-in-water emulsion, and used as a dehydrating agent. The conditions for addition to the sludge after dissolution are not different from ordinary polymer flocculants.

In the method for treating sludge according to the present invention, an inorganic coagulant is added and mixed as a pretreatment of mixed raw sludge of sewage, and then a diluting liquid of the sludge dewatering agent according to claim 1 is added,
Agitation of the sewage-mixed raw sludge is performed by adding agitation, and the agglomerated sludge can be dewatered by a dehydrator. The inorganic coagulant referred to herein is one selected from aluminum sulfate, aluminum chloride, polyaluminum chloride, polyiron sulfate, ferric chloride and a mixture thereof. The amount of the inorganic coagulant added is 10 to 100% by weight per sludge SS (suspension), and the pH is adjusted if necessary. As the dewatering machine in the present invention, a known sludge dewatering machine such as a belt press, a filter press, and a decanter can be selected.

[0024]

EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples unless it exceeds the gist.

(Synthesis Example 1) A reaction vessel equipped with a stirrer and a temperature controller was charged with 120.0 kg of isoparaffin having a boiling point of 190 ° C to 230 ° C and 7.5 kg of sorbitan monooleate. 165 Kg of demineralized water and 27.9997 mol% of acryloyloxyethyltrimethylammonium chloride (AMC) (represented as about 28 in Table 1), 2 mol% of acrylic acid (AAC), 2-hydroxypropylidene 1,3 bis [(N Acryloylaminopropyl) N, N-dimethylammonium chloride] (HPA
D) 3 × 10 ^-4 mol%, acrylamide (AAM) 70
A mixture of 200 kg of monomers of mol% composition is added,
The mixture was emulsified by stirring with a homogenizer. 200 g of isopropyl alcohol was added to the obtained emulsion, and after nitrogen replacement, 40 g of dimethylazobisisobutyrate was added.
The polymerization reaction was completed while controlling the temperature to 50 ° C., and then polyoxyethylene nonyl phenyl ether 7.5K
g was added and mixed to obtain a sample (sample-1) (the coagulant of the present invention) to be subjected to the test.

(Synthesis Example-2) Acryloyloxyethyltrimethylammonium chloride (AMC) 27.998
Mole% (represented as about 28 in Table 1), acrylic acid (AA
C) 2 mol%, 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPAD) 2 × 10 ^-3 mol%,
A sample (sample-2) (coagulant of the present invention) to be subjected to the test was prepared in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of monomer having a composition of acrylamide (AAM) 70 mol% was used.

Synthesis Example 3 Acryloyloxyethyltrimethylammonium chloride (AMC) 49.999
7 mol% (represented as about 50 in Table 1), acrylic acid (AA
C) 10 mol%, 2 hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPAD) 3 × 10 ^-4 mol%,
A sample to be subjected to a test in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of monomer having a composition of 40 mol% of acrylamide (AAM) (sample-3) (flocculant of the present invention)
made.

(Synthesis Example-4) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998
Mole% (represented as about 50 in Table 1), acrylic acid (AA
C) 10 mol%, 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPAD) 2 × 10 ^-3 mol%,
A sample to be subjected to a test in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of monomers having a composition of 40 mol% of acrylamide (AAM) (sample-4) (flocculant of the present invention)
made.

(Synthesis Example-5) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.999
7 mol% (represented as about 90 in Table 1), 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPA
D) 3 × 10 ^-4 mol%, acrylamide (AAM) 50
A sample to be subjected to a test in the same manner as in Synthesis Example 1 except that a mixture of 200 Kg of a monomer having a composition of mol% was used (sample-
5) (Aggregating agent of the present invention) was prepared.

Synthesis Example 6 Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998
Mole% (represented as about 50 in Table 1), 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl)
N, N dimethyl ammonium chloride] (HPAD) 3
× 10 ^-4 mol%, acrylamide (AAM) 50 mol%
A sample to be subjected to the test in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of the monomer having the composition of (Sample-6) was used.
(Aggregating agent of the present invention) was prepared.

(Comparative Synthesis Example 1) 2-hydroxypropylidene 1,3-bis [(Nacryloylaminopropyl) N, N-dimethylammonium chloride] (H
Acryloyloxyethyltrimethylammonium chloride (AMC) 28 mol% without adding PAD)
Acrylic acid (AAC) 2 mol%, acrylamide (AA
M) A sample to be subjected to the test (Sample-7) was prepared in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of the monomer having a composition of only 70 mol% was used.

(Comparative Synthesis Example 2) 2-hydroxypropylidene 1,3-bis [(Nacryloylaminopropyl) N, N-dimethylammonium chloride] (H
Acryloyloxyethyltrimethylammonium chloride (AMC) 50 mol% without adding PAD),
Acrylic acid (AAC) 10 mol%, acrylamide (A
AM) A sample to be subjected to the test (sample-8) was prepared in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of monomer having a composition of only 40 mol% was used.

(Comparative Synthesis Example 3) 2-hydroxypropylidene 1,3 bis [(Nacryloylaminopropyl) N, N-dimethylammonium chloride] (H
Acryloyloxyethyltrimethylammonium chloride (AMC) 50 mol% without adding PAD),
A sample (sample-9) to be subjected to the test was prepared in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of monomer having a composition of only 50 mol% of acrylamide (AAM) was used.

(Comparative Synthesis Example-4) Acryloyloxyethyltrimethylammonium chloride (AMC) 27.998 mol was obtained in the same manner as in Synthesis Example-2 except that the polymerization was carried out without adding isopropyl alcohol as a chain transfer agent. % (Represented as about 28 in Table 1), acrylic acid (AAC)
2 mol%, 2-hydroxypropylidene 1,3 bis [(N
Acryloylaminopropyl) N, N-dimethylammonium chloride] (HPAD) 2 × 10 ^-3 mol%, acrylamide (AAM) 70 mol% monomer 200
A sample to be subjected to a test using a mixture of Kg (Sample-1
0) was made.

(Comparative Synthesis Example-5) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998 mol was obtained in the same manner as in Synthesis Example-4 except that polymerization was carried out without adding isopropyl alcohol as a chain transfer agent. % (Represented as about 50 in Table 1), acrylic acid (AAC)
10 mol%, 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPAD) 2 × 10 ^-3 mol%,
A sample to be subjected to a test using a mixture of 200 kg of monomer having a composition of acrylamide (AAM) 40 mol% (sample-
11) was made.

(Comparative Synthesis Example-6) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998 mol was obtained in the same manner as in Synthesis Example-6 except that polymerization was carried out without adding isopropyl alcohol as a chain transfer agent. % (Represented as about 50 in Table 1), 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl)
N, N dimethyl ammonium chloride] (HPAD) 2
× 10 ^-3 mol%, acrylamide (AAM) 50 mol%
A sample to be subjected to the test (Sample-12) was prepared using a mixture of 200 kg of the monomer having the composition of

(Comparative Synthesis Example-7) In the presence of a chain transfer agent,
Acryloyloxyethyltrimethylammonium chloride (AMC) 27.998 mol% (represented as about 28 in Table 1), acrylic acid (AAC) 2 mol%, 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPA
D) 2 × 10 ^-3 mol%, acrylamide (AAM) 70
A reverse phase emulsion polymer similar to that in Synthesis Example 2 was synthesized using a mixture of 200 kg of a monomer having a composition of mol%, and a test was conducted without adding polyoxyethylene nonylphenyl ether as a phase inversion agent to the polymer. (Sample-13) was prepared.

(Comparative Synthesis Example-8) In the presence of a chain transfer agent,
Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998 mol% (represented as about 50 in Table 1), acrylic acid (AAC) 10 mol%, 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPA
D) 2 × 10 ^-3 mol%, acrylamide (AAM) 40
A reverse phase emulsion polymer similar to that in Synthesis Example 2 was synthesized using a mixture of 200 kg of a monomer having a composition of mol%, and a test was conducted without adding polyoxyethylene nonylphenyl ether as a phase inversion agent to the polymer. (Sample-14) was prepared.

(Comparative Synthesis Example-9) In the presence of a chain transfer agent,
Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998 mol% (represented as about 50 in Table 1), 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPAD ) 200 kg of a monomer having a composition of 2 × 10 ^-3 mol% and 50 mol% of acrylamide (AAM)
The same reverse phase emulsion polymer as in Synthesis Example 2 was synthesized using the mixture of the above, and a sample to be subjected to the test (Sample-15) without adding polyoxyethylene nonylphenyl ether as a phase inversion agent to the polymer later. )made. The above is summarized in Table 1.

[0040]

[Table 1]

(Observation Result-1) Emulsion sample-1 to sample-6 were diluted with tap water to a polymer concentration of 0.2% by weight under stirring with an actual screw type stirring device (300 rpm). After the passage of time, the thickened liquid was collected and observed with a microscope.
m or less (approximately 3 μm) were observed. The diluted solution was applied to a glass plate and dried by heating at 105 ° C. to form a continuous dried film. Further, when the ion equivalent value of this diluted solution was measured by colloid titration, the ion equivalent value was 85% or more of the theoretical value.

(Observation Result-2) In the same manner as in Observation Result-1, Sample-7 to Sample-9 in the emulsion state were diluted with tap water using a real stirrer so that the polymer concentration became 0.2% by weight. After 1 hour, the thickened liquid was collected and observed with a microscope. As a result, all of the liquids were homogeneous solutions and no particles were observed. Apply the diluent to a glass plate and apply 105 °
Upon heating and drying at C, a continuous dried film was formed.
Further, when the ion equivalent value of this diluent was measured by colloid titration, all the ion equivalent values were 100% of the theoretical values.

(Observation Result-3) In the same manner as in Observation Result-1, the emulsion sample-10 to sample-12 was diluted with tap water by stirring with an actual stirrer to a polymer concentration of 0.2% by weight. After 1 hour, the thickened liquid was collected and observed with a microscope. Particles having a particle diameter of 30 μm or less (about 3 μm) were observed on one side, and the diluted liquid was applied to a glass plate and heated to 105 ° C. When heated and dried, a granular discontinuous dried film was formed. Further, when the ion equivalent value of this diluent was measured by colloid titration, all the ion equivalent values were 60% or less of the theoretical values.

(Observation Result-4) In the same manner as in Observation Result-1, Samples 13 to 15 in an emulsion state were diluted with tap water using an actual stirrer so that the polymer concentration became 0.2% by weight. As a result, the emulsion did not disperse in water, the gel-like mass floated, and a uniform polymer diluent was not obtained. On the other hand, when vigorous stirring was performed with a magnetic stirrer on a beaker scale, the emulsion was dispersed in water, and a uniform polymer diluent was obtained without floating gel-like lumps. The effect test of Samples 13 to 15 was not performed due to poor solubility.

(Effect test) Observation results Using the diluent prepared in 1-3, sewage mixed raw sludge generated from a sewage treatment plant was dewatered by a belt press. The properties of the sludge subjected to the test are PH; 6.7, SS; 14,300 mg / l, loss on ignition 72.5%, and M alkalinity 1500 mg / l. To this sludge, 30% of SS iron polysulfate was added and mixed well, and then 1.2% of SS polymer was added and stirred, and the mixture was dehydrated by a belt press.

[0046]

[Table 2]

[0047]

It is clear from the above-mentioned effect test that the lack of a chain transfer agent and a crosslinking agent during polymerization results in a lower dehydration effect than the product of the present invention. Since the in-situ dissolution of the coagulant is impossible, it is not practical. The superiority of the present invention over the conventional product is apparent.

[Table-1]

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[Procedure amendment]

[Submission date] April 16, 1997

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0029

[Correction method] Change

[Correction contents]

(Synthesis Example-5) Acryloyloxyethyltrimethylammonium chloride (AMC) 49.999
7 mol% (represented as about 90 in Table 1), 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl) N, N dimethyl ammonium chloride] (HPA
D) 3 × 10 ⁻⁴ mol%, acrylamide (AAM) 5
A sample (sample-5) (coagulant of the present invention) to be subjected to the test was prepared in the same manner as in Synthesis Example 1 except that a mixture of 200 kg of the monomer having a composition of 0 mol% was used.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0030

[Correction method] Change

[Correction contents]

Synthesis Example 6 Acryloyloxyethyltrimethylammonium chloride (AMC) 49.998
Mole% (represented as about 50 in Table 1), 2-hydroxypropylidene 1,3 bis [(N acryloylaminopropyl)
N, N dimethyl ammonium chloride] (HPAD) 3
Sample to be subjected to a test in the same manner as in Synthesis Example-1 except that a mixture of 200 kg of a monomer having a composition of × 10 ^-4 mol% and acrylamide (AAM) 50 mol% was used (sample-6).
(Aggregating agent of the present invention) was prepared.

Claims (7)

[Claims] 1. A polymer obtained by subjecting a monomer containing a water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof to reverse phase emulsion polymerization in the presence of a chain transfer agent: And a mixture of a hydrophilic surfactant and diluted with water to a concentration to be added to sludge, particles having a particle size of 30 μm or less are observed under a microscope, and the diluted solution is applied to a glass plate.
A dewatering agent for sewage-mixed raw sludge, which has a property of forming a continuous dried film when heated and dried at 5 ° C. Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. ) 2. (A) 5 to 99.9999 mol% of the total monomer, a water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof, and (B) a total monomer 0.000
1 to 0.01% by mole of a bifunctional monomer, (C) 0 to 30% by mole of a water-soluble anionic vinyl monomer or a mixture thereof in all monomers, (D) a nonionic water-soluble monomer Body, (E)
A chain transfer agent, (F) water, (G) an oil comprising at least one hydrocarbon and (H) a reverse phase or water-in-oil emulsion in an amount effective to produce an HL.
At least one type of surfactant B is prepared, and the above components (A) to (H) are mixed and stirred vigorously as necessary to form fine monomer phase droplets in an oil phase, and then a polymerization operation is performed. A method for producing a dewatering agent for sewage-mixed raw sludge, comprising mixing a hydrophilic surfactant and diluting with water. Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. ) 3. A water-soluble cationic vinyl monomer represented by the following formula (1) or a mixture thereof, wherein: (A) 5 to 97.9999 mol% of all monomers; 0.000
1 to 0.01 mol% of a bifunctional monomer, (C) 2 to 30 mol% of a water-soluble anionic vinyl monomer or a mixture thereof, (D) a nonionic water-soluble monomer Body, (E)
A chain transfer agent, (F) water, (G) an oil comprising at least one hydrocarbon and (H) a reverse phase or water-in-oil emulsion in an amount effective to produce an HL.
At least one type of surfactant B is prepared, and the above components (A) to (H) are mixed and stirred vigorously as necessary to form fine monomer phase droplets in an oil phase, and then a polymerization operation is performed. The method for producing a dewatering agent for sewage mixed raw sludge according to claim 2, wherein a hydrophilic surfactant is mixed and diluted with water. Embedded image (Where A is O or NH; B is C ₂ H ₄ , C ₃
H ₆ , C ₃ H ₅ OH; R ₁ is H or CH ₃ ; R ₂ , R
₃ represents an alkyl group having 1 to 4 carbon atoms; R ₄ represents hydrogen or an alkyl group having 1 to 4 carbon atoms or a benzyl group; X ⁻ represents an anionic counter ion. ) 4. The method for producing a dewatering agent for sewage-mixed raw sludge according to claim 2, wherein the nonionic water-soluble monomer is (meth) acrylamide. 5. The method for producing a dewatering agent for sewage mixed raw sludge according to claim 2, wherein the water-soluble anionic vinyl monomer is (meth) acrylic acid. 6. The bifunctional monomer is N, N'-methylenebisacrylamide or 2-hydroxypropylidene 1,3bis [(N acryloylaminopropyl) N, N
6. A method for producing a dewatering agent for sewage-mixed raw sludge according to claim 2, characterized in that it is dimethylammonium chloride]. 7. The method for producing a dewatering agent for sewage mixed raw sludge according to claim 2, wherein the hydrophilic surfactant is a nonionic surfactant having an HLB of 9 to 15.