CN115322281A - Amphoteric sludge dehydrating agent and preparation method thereof - Google Patents
Amphoteric sludge dehydrating agent and preparation method thereof Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/04—Acids; Metal salts or ammonium salts thereof
- C08F220/06—Acrylic acid; Methacrylic acid; Metal salts or ammonium salts thereof
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F11/00—Treatment of sludge; Devices therefor
- C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
- C02F11/14—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents
- C02F11/147—Treatment of sludge; Devices therefor by de-watering, drying or thickening with addition of chemical agents using organic substances
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/10—Esters
- C08F220/34—Esters containing nitrogen, e.g. N,N-dimethylaminoethyl (meth)acrylate
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/56—Acrylamide; Methacrylamide
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F220/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical or a salt, anhydride ester, amide, imide or nitrile thereof
- C08F220/02—Monocarboxylic acids having less than ten carbon atoms; Derivatives thereof
- C08F220/52—Amides or imides
- C08F220/54—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide
- C08F220/58—Amides, e.g. N,N-dimethylacrylamide or N-isopropylacrylamide containing oxygen in addition to the carbonamido oxygen, e.g. N-methylolacrylamide, N-(meth)acryloylmorpholine
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F226/00—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen
- C08F226/02—Copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a single or double bond to nitrogen or by a heterocyclic ring containing nitrogen by a single or double bond to nitrogen
Abstract
The invention discloses an amphoteric sludge dehydrating agent and a preparation method thereof. The invention takes acrylamide monomer, monomer with cation and monomer with anion as raw materials, and adds initiator, polymerization auxiliary agent, surfactant, dispersant and other auxiliary materials to prepare the high-efficiency amphoteric sludge dehydrating agent through the steps of high-temperature polymerization, drying, crushing and the like, thereby solving the problem of low treatment efficiency of the existing single-ion type sludge dehydrating agent. The amphoteric sludge dehydrating agent is applied to the treatment of sludge generated by biochemical treatment after the offshore drilling waste liquid is pretreated, so that the water content of the sludge can be greatly reduced, and the turbidity of water subjected to filter pressing is reduced. The invention can meet the requirements of dehydration of sludge with complex water quality, various pollutants and anions and cations, and has good application prospect.
Description
Technical Field
The invention relates to the technical field of offshore drilling waste liquid treatment, in particular to an amphoteric sludge dehydrating agent and a preparation method thereof.
Background
The offshore drilling waste liquid is pretreated by a series of processes and then needs to be further treated by a biochemical link, and a large amount of chemical agents and polymers are added during drilling, so that the waste liquid can generate a large amount of activated sludge after biochemical treatment, the water content is up to more than 95 percent, meanwhile, the sludge contains various highly dispersed and viscous anionic and cationic particles, the components are complex, and solid and liquid are difficult to separate.
The key of the activated sludge treatment after the biochemical treatment is to solve the problem of sludge dehydration, the dehydrated sludge has low water content and greatly reduced volume, and the scale and the cost of subsequent sludge transportation, composting, landfill or drying and incineration are also greatly reduced. However, since sludge has high hydrophilicity and thus contains water which is difficult to remove directly by a machine, pretreatment of sludge by a sludge-dewatering agent, i.e., by a chemical or physical method, is an effective method. The sludge dewatering agent is characterized in that the physical and chemical properties of sludge particles are changed, the colloid structure of sludge is destroyed, more bound water and free moisture are separated from the sludge particles, and the dewatering performance is improved. Has the characteristics of simple operation, economy and effectiveness, and becomes a common method at home and abroad.
At present, most of sewage treatment plants use single-ion organic polymer sludge dehydrating agents, which can not meet the requirements of complex water quality, various pollutants and dehydration of sludge containing anions and cations, while the amphoteric organic polymer polyelectrolyte has unique property, and is suitable for treating pollutants with different charges because of the common characteristics of anionic and cationic organic polymer flocculants. Therefore, the development of the high-performance amphoteric sludge dehydrating agent is a practical requirement for the development of a sludge dehydrating technology, and has a good application prospect.
Disclosure of Invention
The invention provides an amphoteric sludge dehydrating agent and a preparation method thereof in order to solve the technical problems.
In a first aspect, the invention provides an amphoteric sludge dehydrating agent, which is realized by adopting the following technical scheme.
An amphoteric sludge dewatering agent comprises the following components in parts by weight:
20-70 parts of Acrylamide (AM) monomer;
30-80 parts of monomer with cation;
30-80 parts of monomer with anion;
0.1-0.5 part of initiator A;
0.1-0.5 part of initiator B;
0.1-0.5 part of initiator C;
0.01-0.1 part of polymerization assistant;
0.01-0.1 part of surfactant;
0.02-0.12 part of dispersant;
40-100 parts of deionized water.
Further, the cationic monomer is selected from one of dimethyldiallylammonium chloride (DMDAAC), methacryloyloxyethyltrimethyl ammonium chloride (DMC), acryloyloxyethyltrimethyl ammonium chloride (DAC), octadecyl dimethyl allyl ammonium chloride (C18 DMAAC), and diethyldiallylammonium chloride (DEDAAC).
Further, the monomer with anion is selected from one of Acrylic Acid (AA), 2-acrylamide-2-methyl propane sulfonic Acid (AMPS) and Acrylonitrile (AC).
Further, the initiator A is an inorganic initiator, and sodium bisulfite or sodium persulfate is selected.
Further, the initiator B is an organic initiator and is dibenzoyl peroxide.
Further, the initiator C is an azo initiator, and Azodiisobutyronitrile (ABIN) or Azodiisoheptanonitrile (ABVN) is selected.
Furthermore, the surfactant is an amino acid type amphoteric surfactant, and sodium dodecyl aminopropionate or sodium dodecyl dimethylene aminodiformate is selected.
Furthermore, the polymerization auxiliary agent is diethylene diamine pentaacetic acid or sodium salt thereof.
Furthermore, the dispersant is nonylphenol polyoxyethylene ether or sodium hexametaphosphate.
In a second aspect, the present application provides a method for preparing an amphoteric sludge-dewatering agent, which is implemented by using the following technical scheme.
The preparation method of the amphoteric sludge dehydrating agent comprises the following steps:
s1, mixing prescribed amount of acrylamide, monomer with cation, monomer with anion, dispersant and deionized water, stirring at a certain temperature until all the monomers are dissolved, and introducing inactive gas for a certain time to discharge oxygen;
s2, adjusting the pH value of the mixed solution obtained in the step S1, adding a specified amount of an initiator A, an initiator B, an initiator C, a polymerization assistant and a surfactant, stirring at a certain temperature, and reacting for a certain time to obtain a solid colloid;
and S3, drying the solid colloid obtained in the step S2 at high temperature, drying at low temperature, and crushing and sieving to obtain amphoteric sludge dehydrating agent powder.
Further, in the step S1, the stirring temperature is 25-35 ℃, and the stirring speed is 300-600rpm; the inactive gas is introduced for 30-60min, and is selected from nitrogen, argon, neon, and helium.
Further, in step S2, adjusting the pH value of the mixed solution obtained in step S1 to 4-8 by using phosphoric acid; the stirring temperature is 40-60 ℃, the stirring speed is 500-1000rpm, and the reaction time is 1-3h.
Further, in step S3, the high-temperature drying temperature is 60-80 ℃, and the low-temperature drying temperature is 40-60 ℃; the median of the particle size of the prepared amphoteric sludge dehydrating agent powder is less than 1mm.
The amphoteric sludge dehydrating agent prepared by the method can be applied to the treatment of sludge with the temperature of 10-30 ℃, the pH value of 7-12 and the water content of 85% -99%.
The present application has the following advantageous effects.
The sludge dehydrating agent disclosed by the invention can meet the requirements of dehydrating sludge containing anions and cations, which has complex water quality and various pollutant types, effectively improves the sludge property, destroys the colloid structure of the sludge, reduces the sludge hydrophilicity, facilitates the subsequent treatment of the sludge, reduces the treatment cost and has a wide application prospect.
Drawings
FIG. 1 is a graph showing the results of performance tests of the amphoteric sludge-dehydrating agents prepared in examples 1 to 3 of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
Example 1
A preparation method of an amphoteric sludge dehydrating agent comprises the following steps:
s1, mixing 30kg of acrylamide, 70kg of dimethyl diallyl ammonium chloride (DMDAAC), 70kg of Acrylic Acid (AA), 0.04kg of nonylphenol polyoxyethylene ether and 90kg of deionized water, slowly stirring at 25 ℃ and a stirring speed of 300rpm until all the components are dissolved, and introducing 30min of nitrogen to discharge oxygen;
s2, adjusting the pH value of the mixed solution obtained in the step S1 to 5 by using phosphoric acid, adding 0.2kg of sodium bisulfite, 0.2kg of dibenzoyl peroxide, 0.2kg of Azobisisobutyronitrile (ABIN), 0.02kg of diethylene diamine pentaacetic acid and 0.04kg of sodium dodecyl aminopropionate, stirring at the temperature of 45 ℃ and the stirring speed of 600rpm, and reacting for 2 hours to obtain a solid colloid;
and S3, drying the solid colloid obtained in the step S2 at a high temperature of 80 ℃, drying at a low temperature of 45 ℃, and crushing and sieving to obtain amphoteric sludge dehydrating agent powder.
Example 2
A preparation method of an amphoteric sludge dehydrating agent comprises the following steps:
s1, mixing 50kg of acrylamide, 60kg of methacryloxyethyl trimethyl ammonium chloride (DMC), 60kg of 2-acrylamido-2-methylpropanesulfonic Acid (AMPS) and 0.06kg of sodium hexametaphosphate with a specified amount of 90kg of deionized water, slowly stirring at 30 ℃ and a stirring speed of 400rpm until all the materials are dissolved, and introducing 40min of argon to discharge oxygen;
s2, adjusting the pH value of the mixed solution obtained in the step S1 to 5 by using phosphoric acid, adding 0.4kg of sodium persulfate, 0.4kg of dibenzoyl peroxide, 0.4kg of Azobisisoheptonitrile (ABVN), 0.03kg of diethylene diamine pentaacetic acid and 0.06kg of sodium dodecyl dimethylene amino diformate, stirring at the temperature of 55 ℃ and the stirring speed of 700rpm, and reacting for 3 hours to obtain a solid colloid;
and S3, drying the solid colloid obtained in the step S2 at a high temperature of 70 ℃, drying at a low temperature of 50 ℃, and crushing and sieving to obtain amphoteric sludge dehydrating agent powder.
Example 3
A preparation method of an amphoteric sludge dehydrating agent comprises the following steps:
s1, mixing 60kg of acrylamide, 50kg of acryloyloxyethyl trimethyl ammonium chloride (DAC), 50kg of Acrylonitrile (AC), 0.08kg of sodium hexametaphosphate and 90kg of deionized water, slowly stirring at 35 ℃ and a stirring speed of 500rpm until the mixture is completely dissolved, and introducing helium for 50min to discharge oxygen;
s2, adjusting the pH value of the mixed solution obtained in the step S1 to 6 by using phosphoric acid, adding 0.5kg of sodium persulfate, 0.5kg of dibenzoyl peroxide, 0.5kg of Azobisisoheptonitrile (ABVN), 0.04kg of diethylene diamine pentaacetic acid and 0.08kg of sodium dodecyl dimethylene amino diformate, stirring at the temperature of 60 ℃ and the stirring speed of 800rpm, and reacting for 2 hours to obtain a solid colloid;
and S3, drying the solid colloid obtained in the step S2 at a high temperature of 75 ℃, drying at a low temperature of 55 ℃, and crushing and sieving to obtain amphoteric sludge dehydrating agent powder.
Example 4
A preparation method of an amphoteric sludge dehydrating agent comprises the following steps:
s1, mixing 45kg of acrylamide, 50kg of octadecyl dimethyl allyl ammonium chloride (C18 DMAAC), 60kg of Acrylic Acid (AA), 0.1kg of sodium hexametaphosphate and 80kg of deionized water, slowly stirring at the temperature of 30 ℃ and the stirring speed of 300rpm until all the components are dissolved, and introducing nitrogen for 30min to discharge oxygen;
s2, adjusting the pH value of the mixed solution obtained in the step S1 to 5 by using phosphoric acid, adding 0.2kg of sodium bisulfite, 0.2kg of dibenzoyl peroxide, 0.2kg of Azobisisobutyronitrile (ABIN), 0.02kg of diethylene diamine pentaacetic acid and 0.08kg of sodium dodecyl aminopropionate, stirring at the temperature of 55 ℃ and the stirring speed of 600rpm, and reacting for 2 hours to obtain a solid colloid;
and S3, drying the solid colloid obtained in the step S2 at a high temperature of 80 ℃, drying at a low temperature of 45 ℃, and crushing and sieving to obtain amphoteric sludge dehydrating agent powder.
Example 5
A preparation method of an amphoteric sludge dehydrating agent comprises the following steps:
s1, mixing 40kg of acrylamide, 65kg of diethyl diallyl ammonium chloride (DEDAAC), 80kg of Acrylic Acid (AA) and 0.03kg of nonylphenol polyoxyethylene ether with 100kg of deionized water, slowly stirring at the temperature of 30 ℃ and the stirring speed of 400rpm until all the components are dissolved, and introducing nitrogen for 30min to discharge oxygen;
s2, adjusting the pH value of the mixed solution obtained in the step S1 to 6 by using phosphoric acid, adding 0.2kg of sodium bisulfite, 0.2kg of dibenzoyl peroxide, 0.2kg of Azobisisobutyronitrile (ABIN), 0.04kg of diethylenediamine pentaacetic acid and 0.05kg of sodium dodecyl aminopropionate, stirring at the temperature of 50 ℃ and the stirring speed of 500rpm, and reacting for 2 hours to obtain a solid colloid;
and S3, drying the solid colloid obtained in the step S2 at a high temperature of 80 ℃, drying at a low temperature of 45 ℃, and crushing and sieving to obtain amphoteric sludge dehydrating agent powder.
Performance detection
50kg of the high-efficiency amphoteric sludge dehydrating agent prepared in the embodiment 1-5 is added into 100 cubic sludge (pH =7.5, temperature of 25 ℃ and water content of 95%) in a sludge conditioning pool of a water treatment workshop of a certain offshore oilfield solid waste disposal plant, and after the high-efficiency amphoteric sludge dehydrating agent is stirred and mixed uniformly, the water content and turbidity of the sludge are measured after primary plate-and-frame filter pressing; common positive sludge-dewatering agents and negative sludge-dewatering agents (cationic polyacrylamide and anionic polyacrylamide) were selected for comparison, and the results of the respective tests are shown in table 1 and fig. 1.
TABLE 1
As can be seen from Table 1 and FIG. 1, the high-efficiency amphoteric sludge dehydrating agent prepared by the invention can greatly reduce the moisture content and turbidity of sludge, and the treatment effect is obviously superior to that of a single-ion type sludge dehydrating agent.
The embodiments of the present invention are all preferred embodiments of the present invention, and the scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (10)
1. An amphoteric sludge dehydrating agent, which is characterized in that: the paint comprises the following components in parts by weight:
20-70 parts of acrylamide monomer;
30-80 parts of monomer with cation;
30-80 parts of monomer with anions;
0.1-0.5 part of initiator A;
0.1-0.5 part of initiator B;
0.1-0.5 part of initiator C;
0.01-0.1 part of polymerization assistant;
0.01-0.1 part of surfactant;
0.02-0.12 part of dispersant;
40-100 parts of deionized water.
2. An amphoteric sludge-dewatering agent according to claim 1, characterized in that: the cationic monomer is selected from one of dimethyl diallyl ammonium chloride, methacryloyloxyethyl trimethyl ammonium chloride, acryloyloxyethyl trimethyl ammonium chloride, octadecyl dimethyl allyl ammonium chloride and diethyl diallyl ammonium chloride.
3. An amphoteric sludge-dewatering agent according to claim 1, characterized in that: the anionic monomer is selected from one of acrylic acid, 2-acrylamide-2-methyl propane sulfonic acid and acrylonitrile.
4. The amphoteric sludge dewatering agent according to claim 1, wherein: the initiator A is an inorganic initiator and is selected from sodium bisulfite or sodium persulfate.
5. An amphoteric sludge-dewatering agent according to claim 1, characterized in that: the initiator B is an organic initiator and is dibenzoyl peroxide.
6. An amphoteric sludge-dewatering agent according to claim 1, characterized in that: the initiator C is an azo initiator, and azodiisobutyronitrile or azodiisoheptonitrile is selected.
7. A method for producing an amphoteric sludge dewatering agent according to any one of claims 1 to 6, comprising the steps of:
s1, mixing prescribed amount of acrylamide, monomer with cation, monomer with anion, dispersant and deionized water, stirring at a certain temperature until all the monomers are dissolved, and introducing inactive gas for a certain time to discharge oxygen;
s2, adjusting the pH value of the mixed solution obtained in the step S1, adding a specified amount of an initiator A, an initiator B, an initiator C, a polymerization assistant and a surfactant, stirring at a certain temperature, and reacting for a certain time to obtain a solid colloid;
and S3, drying the solid colloid obtained in the step S2 at a high temperature, drying at a low temperature, and crushing and sieving to obtain amphoteric sludge dehydrating agent powder.
8. The method for preparing an amphoteric sludge dewatering agent according to claim 7, wherein: in the step S1, the stirring temperature is 25-35 ℃, and the stirring speed is 300-600rpm; the inert gas is introduced for 30-60min, and is selected from one of nitrogen, argon, neon and helium.
9. The method for preparing an amphoteric sludge-dewatering agent according to claim 7, wherein: in the step S2, adjusting the pH value of the mixed solution obtained in the step S1 to 4-8; the stirring temperature is 40-60 ℃, the stirring speed is 500-1000rpm, and the reaction time is 1-3h.
10. The method for preparing an amphoteric sludge-dewatering agent according to claim 7, wherein: in the step S3, the high-temperature drying temperature is 60-80 ℃, and the low-temperature drying temperature is 40-60 ℃; the median particle size of the prepared amphoteric sludge dehydrating agent powder is less than 1mm.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109893A (en) * | 1993-12-24 | 1995-10-11 | 三井东压化学株式会社 | Acrylamide polymers and use thereof |
| JPH09188991A (en) * | 1996-01-09 | 1997-07-22 | Hymo Corp | Papermaking method |
| JP2001314900A (en) * | 2000-05-11 | 2001-11-13 | Kurita Water Ind Ltd | Sludge dehydration method |
| JP2002256032A (en) * | 2001-02-28 | 2002-09-11 | Hymo Corp | Amphoteric water-soluble high polymer dispersion liquid |
| JP2003164900A (en) * | 2001-11-29 | 2003-06-10 | Hymo Corp | Method of dewatering papermaking sludge |
| CN1994943A (en) * | 2006-11-30 | 2007-07-11 | 华南理工大学 | Amphoteric ion high polymer sludge dehydration agent and its preparation method |
| CN104004130A (en) * | 2014-05-29 | 2014-08-27 | 华南理工大学 | Composite macromolecular sludge dehydrating agent and preparation method thereof |
| US20190375665A1 (en) * | 2017-03-14 | 2019-12-12 | Kurita Water Industries Ltd. | Sludge dehydrating agent and sludge dehydrating method |
| US20210230039A1 (en) * | 2018-06-06 | 2021-07-29 | Kurita Water Industries Ltd. | Sludge dehydration agent and sludge dehydration method |
-
2022
- 2022-07-26 CN CN202210885161.8A patent/CN115322281A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1109893A (en) * | 1993-12-24 | 1995-10-11 | 三井东压化学株式会社 | Acrylamide polymers and use thereof |
| JPH09188991A (en) * | 1996-01-09 | 1997-07-22 | Hymo Corp | Papermaking method |
| JP2001314900A (en) * | 2000-05-11 | 2001-11-13 | Kurita Water Ind Ltd | Sludge dehydration method |
| JP2002256032A (en) * | 2001-02-28 | 2002-09-11 | Hymo Corp | Amphoteric water-soluble high polymer dispersion liquid |
| JP2003164900A (en) * | 2001-11-29 | 2003-06-10 | Hymo Corp | Method of dewatering papermaking sludge |
| CN1994943A (en) * | 2006-11-30 | 2007-07-11 | 华南理工大学 | Amphoteric ion high polymer sludge dehydration agent and its preparation method |
| CN104004130A (en) * | 2014-05-29 | 2014-08-27 | 华南理工大学 | Composite macromolecular sludge dehydrating agent and preparation method thereof |
| US20190375665A1 (en) * | 2017-03-14 | 2019-12-12 | Kurita Water Industries Ltd. | Sludge dehydrating agent and sludge dehydrating method |
| US20210230039A1 (en) * | 2018-06-06 | 2021-07-29 | Kurita Water Industries Ltd. | Sludge dehydration agent and sludge dehydration method |
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