CN104004130B - A kind of composite high-molecular sludge dehydrating agent and preparation method thereof - Google Patents
A kind of composite high-molecular sludge dehydrating agent and preparation method thereof Download PDFInfo
- Publication number
- CN104004130B CN104004130B CN201410236050.XA CN201410236050A CN104004130B CN 104004130 B CN104004130 B CN 104004130B CN 201410236050 A CN201410236050 A CN 201410236050A CN 104004130 B CN104004130 B CN 104004130B
- Authority
- CN
- China
- Prior art keywords
- monomer
- reaction
- aqueous solution
- dehydrating agent
- gross mass
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Landscapes
- Treatment Of Sludge (AREA)
Abstract
The invention discloses a kind of composite high-molecular sludge dehydrating agent and preparation method thereof, comprise the steps: that non-ionic monomer, anionic monomer and cationic monomer are made into aqueous solution with deionized water by (1) respectively, by the aqueous solution of three, adjust pH value 2-6, logical nitrogen, stirring；(2) mixed solution that step (1) prepares adds persulfuric acid salt initiator, sulfites reducing agent, azo initiator and EDTA-2Na, controls reaction temperature, inspires chain and causes and chain propagation reaction；(3) in reaction when proceeding to 2-4h, add iron salt, be sufficiently stirred for, continue logical nitrogen reaction 1-3h, then heat to 70 DEG C, be further continued for discharging after reaction 40～60min, obtain colloid drying successively, pulverizing, pelletize, obtain sludge dehydrating agent.It is little that this dehydrant has consumption, and cost is low, pH scope of application width, the advantages such as flco is thick, and after process, moisture percentage in sewage sludge is low, mineral suspensions high treating effect.
Description
Technical field
The present invention relates to a kind of sludge dehydrating agent, especially a kind of composite high-molecular sludge dehydrating agent and preparation method thereof.
Background technology
By the end of the year in 2012, the treatment rate of domestic sewage of China reached 77.4%." 12 " period, the Chinese government proposes treatment rate of domestic sewage in 2015 to reach the target of 80%, and wherein key cities to reach 85%, and small and medium-sized cities reach 70%.Thus will produce substantial amounts of sewage plant sludge, make Treatment of Sludge become the major issue become increasingly conspicuous.
In sludge treatment technique, what first have to solution is the problem of sludge dewatering.Both sexes organic polymer sludge dehydrating agent, there is the characteristic of anionic organic polymer flocculant and positive ion organic high polymer coagulant simultaneously, flocculating, mainly through several macromolecular chains, float " bridge is even " is formed thick flco, the quality of its effect is relevant with the content of anions and canons and mutual synergism.Both sexes organic polymer sludge dehydrating agent is applied to sludge dewatering, and the mud flco after process not only can be made thick, and moisture content of the cake is low, but also has pH and use the advantages such as wide ranges, energy conditioning ingredients complexity mud；But the defects such as it is more complicated that it still has process technique, optimal coagulant dose narrow range, and cost of water treatment is high.
Iron salt in inorganic dehydration agents is most widely used due to features such as its pH are applied widely, the cohesion coefficient of alumen ustum big, low-temperature and low turbidity disposal ability is strong.Its mechanism of action has very big hydrolysis tendency mainly due to ferric ion itself, thus causing a series of hydrolysis, and then form many nuclear polymers of a series of different shape, these many nuclear polymers often have more positive charge and bigger surface area, electronegative colloid and other float in energy rapid adsorption water body.But there is molecular weight and the shortcoming such as granularity is not high enough, the adsorption bridging of aggregation is indifferent, dosage is more, post processing is difficult in inorganic dehydration agents.
Organic and inorganic dehydrant has very strong complementarity in performance and cost, therefore the inorganic composite important directions having become as flocculant research with organic polymer dehydrant.To the research and development of inorganic organic polymer flocculation dewatering agent mostly also in the experimental stage, industrialization product is little, and have that kind is single, molecular structure is uncontrollable, poor stability and the problem such as dissolubility is bad.
Summary of the invention
It is an object of the invention to the complementarity utilizing dehydrant inorganic, organic in performance and cost, it is provided that the preparation method of a kind of NEW TYPE OF COMPOSITE high polymer sludge dehydration agent being applied in sewage sludge process aspect based on both sexes organic polymer and iron salt.
The purpose of the present invention is achieved through the following technical solutions:
The preparation method of a kind of composite high-molecular sludge dehydrating agent, comprises the steps:
(1) by percentage to the quality, non-ionic monomer, anionic monomer and cationic monomer are made into respectively the aqueous solution of 10%-50% with deionized water, and by the aqueous solution of non-ionic monomer, anionic monomer and cationic monomer, and to regulate solution ph be 2-6, logical nitrogen, stirring；In the mixed solution of preparation, non-ionic monomer accounts for the 50%-90% of monomer gross mass, and anionic monomer accounts for the 5%-25% of monomer gross mass, and cationic monomer accounts for the 5%-25% of monomer gross mass；
(2) mixed solution that step (1) prepares adds the EDTA-2Na being equivalent to the persulfuric acid salt initiator of monomer gross mass 0.05%-0.5%, the sulfites reducing agent of 0.05%-0.5%, the azo initiator of 0.05%-0.5% and 0.05%-0.5%, control reaction temperature, inspire chain and cause and chain propagation reaction；
(3) reaction in step (2) is when proceeding to 2-4h, add and account for the iron salt that monomer gross mass is 1%-30%, it is sufficiently stirred for, continue logical nitrogen reaction 1-3h, then heat to 70 DEG C, it is further continued for discharging after reaction 40～60min, obtains colloid drying successively, pulverizing, pelletize, obtain composite high-molecular sludge dehydrating agent.
Step (1) described non-ionic monomer is acrylamide or Methacrylamide.
Described anionic monomer is that 2-acrylamide-2-methylpro panesulfonic acid, 2-acrylamide-2-methylpro panesulfonic acid sodium, acrylic acid or acrylic acid are received.
Described cationic monomer is acrylyl oxy-ethyl-trimethyl salmiac, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride, dimethyl diallyl trimethyl ammonium chloride or trimethylamine groups acrylic acid methyl ester. ammonium chloride.
Persulfuric acid salt initiator described in step (2) is Ammonium persulfate., sodium peroxydisulfate or potassium peroxydisulfate, sulfites reducing agent is sodium sulfite or sodium sulfite, and azo initiator is azo-bis-isobutyrate hydrochloride or azo diimidazole quinoline base propane dihydrochloride.
Step (1) adopt hydrochloric acid or sodium hydroxide regulate pH value.
Step (2) reaction temperature is 25 DEG C-60 DEG C.
Iron salt described in step (3) is ferric chloride, iron sulfate, bodied ferric sulfate, poly-ferric chloride or PAFS.
In each raw material, inorganic matter gross mass is 10:1～20:1 with the ratio of Organic substance gross mass.
The present invention successfully make use of the feature of organic and inorganic dehydrant, both compounds have reached collaborative effect, inorganic component and organic component is specifically adopted to carry out efficient combination, the reaction mechanism of organic component is the terpolymerization of free radical aqueous solution, adopts redox initiator and azo initiator compound to cause.Principle is: mud colloidal solid becomes absorption water owing to capillary effect absorbs moisture, colloidal grain surface is electronegative mutually exclusive, hinder the gathering of granule, after adding inorganic organic polymer composite dewatering agent of the present invention, inorganic part makes scattered colloidal solid electric charge be neutralized, making it is labile state, and adds the settleability of mineral suspensions simultaneously；Organic moiety then by bridge formation effect by particles agglomerate together, and makes interparticle repulsion potential energy reduce by the charge neutralization on strand, makes particle aggregation precipitate.
The present invention compared with prior art has the advantage that
(1) what the preparation method of the present invention adopted is ternary aqueous solution copolymerization method, and causes using redox initiator and azo initiator as compound, makes copolymer polymerization process steady, and molecular structure is uniform, and conversion ratio is high.
(2) present invention carries out warming temperature before reaction terminates, and improves the conversion ratio of copolymerization, reduces the residual volume of acrylamide monomer.
(3) present invention utilizes the dehydrant inorganic, organic complementarity on Cost And Performance, successfully carries out compound and prepares, has saved preparation cost, simplified and add operation.
(4) inorganic-organic hybrid macromolecule dehydrant provided by the invention is used for Treatment of Sludge, has consumption little, pH scope of application width, the advantages such as flco is thick, and after process, moisture percentage in sewage sludge is low, mineral suspensions high treating effect.
Accompanying drawing explanation
Fig. 1 is different dehydrant lignin-sludge topography scan Electronic Speculum figure, left figure is that CPAM processed, and right figure is that composite dewatering agent of the present invention processed.
Fig. 2 is that composite dewatering agent of the present invention nurses one's health different pH moisture percentage in sewage sludge variation diagrams from CPAM.
Fig. 3 is that composite dewatering agent of the present invention nurses one's health different pH sludge specific resistance variation diagrams from CPAM.
Fig. 4 is the transmission electron microscope picture of the composite dewatering agent that embodiment 1 prepares, and left figure amplifies 5000 times, and right figure amplifies 10000 times.
Detailed description of the invention
Below in conjunction with specific embodiment, invention is described further, but is not limited to this.
Embodiment 1
(1) with deionized water respectively by 0.76kg acrylamide (industry refining pure powder, prosperous nine companies in Jiangxi, lower same) it is made into 7.6kg aqueous solution, 0.08kg2-acrylamide-2-methylpro panesulfonic acid (concentration be 60% industrial refined soln, Lubrizol Corp. of the U.S., lower with) be made into 0.48kg aqueous solution, 0.26kg acrylyl oxy-ethyl-trimethyl salmiac (concentration be 70% industrial refined soln, Jiangsu Nantian Company, lower same) it is made into 1.8kg aqueous solution.Above-mentioned three kinds of aqueous solutions are added in the enamel reaction still with agitator and heating jacket, after regulating pH to 4 with 1% mass fraction hydrochloric acid and sodium hydroxide, starts stirring, letting nitrogen in and deoxidizing；
(2) being separately added into 0.006kg Ammonium persulfate. in the solution of reactor, 0.003kg bisulfite is received, 0.003kg azo-bis-isobutyrate hydrochloride (industry refining crystallization, Guangzhou edge of wound company, lower same), the EDTA-2Na of 0.002kg, controlling reaction temperature is 45 DEG C；
(3) in reaction when proceeding to 2h, add the ferric chloride of 0.1kg, be sufficiently stirred for, continue logical nitrogen reaction 2h and then heat to 70 DEG C, react 40min discharging again, obtain colloid dry, pulverize, pelletize both inorganic-organic hybrid high polymer sludge dehydration agent (composite drug).
Composite sludge dehydration the agent mud to be drained off processed and the making comparisons that cation acrylamide CPAM processed that will be prepared by embodiment 1, analyzes mud flco shape characteristic, such as Fig. 1.Drawing by contrasting, composite sludge dehydration agent improves volume and the density of mud flco, contributes to the raising of dewatering performance of sludge.
The composite dewatering agent prepared by embodiment 1 is nursed one's health respectively from CPAM the mud of different pH value, the pH adaptability of analysis dehydrant, result such as Fig. 2,3.Finding by contrasting, the broader mud of pH is remained to play good opsonic action by composite dewatering agent of the present invention.
As shown in Figure 4, it is little that composite dewatering agent molecule of the present invention presents backbone, strand good rigidly, it is possible to be fully extended, chain side chain and crosslinking phenomena, makes molecule flocculation activity improve, is conducive to the bridging action to mud.
Embodiment 2
(1) respectively 0.73kg acrylamide (industry refining pure powder) is made into 7.3kg aqueous solution with deionized water, the 0.13kg2-acrylamide-2-methylpro panesulfonic acid industrial refined soln of 60% (concentration be) is made into 0.8kg aqueous solution, and the 0.22kg acrylyl oxy-ethyl-trimethyl salmiac industrial refined soln of 70% (concentration be) is made into 1.5kg aqueous solution.Above-mentioned three kinds of aqueous solutions are added in the enamel reaction still with agitator and heating jacket, after regulating pH to 3 with 1% mass fraction hydrochloric acid and sodium hydroxide, starts stirring, letting nitrogen in and deoxidizing；
(2) being separately added into 0.004kg potassium peroxydisulfate in the solution of reactor, 0.002kg sodium sulfite, 0.005kg azo diimidazole quinoline base propane dihydrochloride, the EDTA-2Na of 0.004kg, controlling reaction temperature is 30 DEG C；
(3) in reaction when proceeding to 3h, add the iron sulfate of 0.05kg, be sufficiently stirred for, continue logical nitrogen reaction 3h and then heat to 70 DEG C, react 40min discharging again, obtain colloid dry, pulverize, pelletize both inorganic-organic hybrid high polymer sludge dehydration agent.
Embodiment 3
(1) respectively 0.68kg Methacrylamide (industry refining pure powder) is made into 6.8kg aqueous solution with deionized water, the 0.14kg acrylic acid industrial refined soln of 60% (concentration be) is made into 0.82kg aqueous solution, and the 0.33kg dimethyl diallyl trimethyl ammonium chloride industrial refined soln of 70% (concentration be) is made into 2.3kg aqueous solution.Above-mentioned three kinds of aqueous solutions are added in the enamel reaction still with agitator and heating jacket, after regulating pH to 5 with 1% mass fraction hydrochloric acid and sodium hydroxide, starts stirring, letting nitrogen in and deoxidizing；
(2) being separately added into 0.004kg potassium peroxydisulfate in the solution of reactor, 0.005kg bisulfite is received, 0.004kg azo-bis-isobutyrate hydrochloride, adds the EDTA-2Na of 0.004kg, and controlling reaction temperature is 55 DEG C, inspires chain and causes and chain propagation reaction；
(3) in reaction when proceeding to 4h, add the poly-ferric chloride of 0.2kg, be sufficiently stirred for, continue logical nitrogen reaction 3h and then heat to 70 DEG C, react 40min discharging again, obtain colloid dry, pulverize, pelletize both inorganic-organic hybrid high polymer sludge dehydration agent.
Embodiment 4
(1) respectively 0.76kg Methacrylamide (industry refining pure powder) is made into 4.5kg aqueous solution with deionized water, 0.31kg acrylic acid receive the industrial refined soln of 60% (concentration be) be made into 1.9kg aqueous solution, the 0.5kg trimethylamine groups acrylic acid methyl ester. ammonium chloride industrial refined soln of 70% (concentration be) is made into 3.5kg aqueous solution.Above-mentioned three kinds of aqueous solutions are added in the enamel reaction still with agitator and heating jacket, after regulating pH to 6 with 1% mass fraction hydrochloric acid and sodium hydroxide, starts stirring, letting nitrogen in and deoxidizing；
(2) in the solution of reactor, 0.006kg Ammonium persulfate. it is separately added into, 0.002kg bisulfite is received, 0.004kg azo diimidazole quinoline base propane dihydrochloride, adds the EDTA-2Na of 0.002kg, controlling reaction temperature is 30 DEG C, inspires chain and causes and chain propagation reaction；
(3) in reaction when proceeding to 3h, add the bodied ferric sulfate of 0.3kg, be sufficiently stirred for, continue logical nitrogen reaction 2h and then heat to 70 DEG C, react 40min discharging again, obtain colloid dry, pulverize, pelletize both inorganic-organic hybrid high polymer sludge dehydration agent.
The inorganic organic polymer sludge dehydrating agent that above-described embodiment prepares is applied to certain municipal sewage plant mud to be drained off (moisture content 96%-98%, pH value 6.8), dosage is 40mg/l, and makes comparisons with certain commercially available cation acrylamide CPAM, and treatment effect is listed in table 1.
Table 1
As can be seen from Table 1, this inorganic organic polymer sludge dehydrating agent has good sludge dewatering effect, is better than certain commercially available cation dehydrant, when identical dosage, the compound of inorganic component makes dehydrating effect improve, and reduces the cost of dehydrant.Simultaneously before the reaction by warming temperature, reduce the acrylamide residual volume of medicament, improve copolymerization conversion ratio.
Claims (9)
1. the preparation method of a composite high-molecular sludge dehydrating agent, it is characterised in that comprise the steps:
(1) by percentage to the quality, non-ionic monomer, anionic monomer and cationic monomer are made into respectively the aqueous solution of 10%-50% with deionized water, and by the aqueous solution of non-ionic monomer, anionic monomer and cationic monomer, and to regulate solution ph be 2-6, logical nitrogen, stirring；In the mixed solution of preparation, non-ionic monomer accounts for the 50%-90% of monomer gross mass, and anionic monomer accounts for the 5%-25% of monomer gross mass, and cationic monomer accounts for the 5%-25% of monomer gross mass；
(2) mixed solution that step (1) prepares adds and is all equivalent to the persulfuric acid salt initiator of monomer gross mass 0.05%-0.5%, sulfites reducing agent, azo initiator and EDTA-2Na, control reaction temperature, inspire chain and cause and chain propagation reaction；
(3) reaction in step (2) is when proceeding to 2-4h, add and account for the iron salt that monomer gross mass is 1%-30%, it is sufficiently stirred for, continue logical nitrogen reaction 1-3h, then heat to 70 DEG C, it is further continued for discharging after reaction 40～60min, obtains colloid drying successively, pulverizing, pelletize, obtain composite high-molecular sludge dehydrating agent.
2. method according to claim 1, it is characterised in that step (1) described non-ionic monomer is acrylamide or Methacrylamide.
3. method according to claim 2, it is characterised in that described anionic monomer is 2-acrylamide-2-methylpro panesulfonic acid, 2-acrylamide-2-methylpro panesulfonic acid sodium, acrylic acid or sodium acrylate.
4. method according to claim 3, it is characterised in that described cationic monomer is acrylyl oxy-ethyl-trimethyl salmiac, MethacryloyloxyethylTrimethyl Trimethyl Ammonium Chloride or trimethylamine groups acrylic acid methyl ester. ammonium chloride.
5. the method according to claim 1 or 2 or 3 or 4, it is characterized in that, persulfuric acid salt initiator described in step (2) is Ammonium persulfate., sodium peroxydisulfate or potassium peroxydisulfate, sulfites reducing agent is sodium sulfite or sodium sulfite, and azo initiator is azo-bis-isobutyrate hydrochloride or azo diimidazole quinoline base propane dihydrochloride.
6. method according to claim 5, it is characterised in that adopt hydrochloric acid or sodium hydroxide to regulate pH value in step (1).
7. method according to claim 6, it is characterised in that step (2) reaction temperature is 25 DEG C-60 DEG C.
8. method according to claim 7, it is characterised in that the iron salt described in step (3) is ferric chloride, iron sulfate, bodied ferric sulfate, poly-ferric chloride or PAFS.
9. the high polymer sludge dehydration agent that prepared by method described in claim 1～8 any one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410236050.XA CN104004130B (en) | 2014-05-29 | 2014-05-29 | A kind of composite high-molecular sludge dehydrating agent and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410236050.XA CN104004130B (en) | 2014-05-29 | 2014-05-29 | A kind of composite high-molecular sludge dehydrating agent and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104004130A CN104004130A (en) | 2014-08-27 |
| CN104004130B true CN104004130B (en) | 2016-07-06 |
Family
ID=51365054
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410236050.XA Active CN104004130B (en) | 2014-05-29 | 2014-05-29 | A kind of composite high-molecular sludge dehydrating agent and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104004130B (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR3032700B1 (en) * | 2015-02-12 | 2021-01-22 | Snf Sas | PROCESS FOR THE TREATMENT OF SUSPENSIONS OF SOLID PARTICLES IN WATER USING AMPHOTERIC POLYMERS |
| CN104817251B (en) * | 2015-04-08 | 2018-01-09 | 华南理工大学 | A kind of composite high-molecular sludge dehydrating agent and preparation method thereof |
| CN104944737A (en) * | 2015-06-23 | 2015-09-30 | 杜普利 | Sludge dehydrating agent and dehydrating method thereof |
| CN107459250A (en) * | 2017-09-25 | 2017-12-12 | 常州苏通海平机电科技有限公司 | A kind of preparation method of sewage dehydrating agent |
| CN108178488A (en) * | 2017-12-12 | 2018-06-19 | 常州莱尚纺织品有限公司 | A kind of preparation method of sludge dehydrating agent |
| CN110981160A (en) * | 2019-12-23 | 2020-04-10 | 广东慧信环保有限公司 | Novel composite sludge dehydrating agent and preparation and use methods thereof |
| CN114436500A (en) * | 2022-01-27 | 2022-05-06 | 爱环吴世（苏州）环保股份有限公司 | Functional composite flocculant for sludge and preparation method thereof |
| CN114276488B (en) * | 2022-03-03 | 2022-06-03 | 河南博源新材料有限公司 | Long-chain branch multi-head cationic polyacrylamide and application thereof |
| CN115322281A (en) * | 2022-07-26 | 2022-11-11 | 中海石油环保服务（天津）有限公司 | Amphoteric sludge dehydrating agent and preparation method thereof |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100348511C (en) * | 2005-06-09 | 2007-11-14 | 山东大学 | Flocculation agent of poly ferric-dimethyl diallyl ammonium chloride homopolymer inorganic organic composited and preparation process thereof |
| CN100535020C (en) * | 2006-11-30 | 2009-09-02 | 华南理工大学 | Amphoteric ion high polymer sludge dehydration agent and its preparation method |
| CN101348318A (en) * | 2008-09-10 | 2009-01-21 | 四川省水处理及资源化工程技术研究中心 | Sludge dewatering composite flocculant |
| JP2013215708A (en) * | 2012-04-05 | 2013-10-24 | Mt Aquapolymer Inc | Amphoteric water-soluble polymer flocculant and method for dehydrating sludge by using the same |
-
2014
- 2014-05-29 CN CN201410236050.XA patent/CN104004130B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN104004130A (en) | 2014-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104004130B (en) | A kind of composite high-molecular sludge dehydrating agent and preparation method thereof | |
| Hu et al. | Evaluation of the structural factors for the flocculation performance of a co-graft cationic starch-based flocculant | |
| CN104649398B (en) | Organic polymer heavy metal chelating flocculant as well as preparation method and application thereof | |
| CN106335988A (en) | Composite high polymer flocculant for coking wastewater and preparation method thereof | |
| CN104724809B (en) | A kind of ternary polymerization flocculant based on natural polymer and preparation method thereof | |
| CN102093505B (en) | Preparation method of star polymer | |
| CN102250291A (en) | Ampholytic modified grafted starch flocculant | |
| CN103570868A (en) | Aqueous solution polymerization preparation method for (meth)acrylamido propyl trimethyl ammonium chloride and acrylamide copolymer | |
| JP2011139997A (en) | Coagulation treatment method for waste water | |
| CN100535020C (en) | Amphoteric ion high polymer sludge dehydration agent and its preparation method | |
| CN106365336A (en) | Chelating dispersant | |
| CN101643527A (en) | Amphoteric or cationic polymeric flocculating agent | |
| CN103524672A (en) | Method for preparing cationic flocculant | |
| CN106008798A (en) | Method for preparing mico-crosslinking hydrophobically associating cation polyacrylamide flocculent | |
| CN103964554B (en) | Polyaluminum sulfate titanium-polydimethyldiallylachloride chloride composite coagulant and preparation and application method thereof | |
| CN103304016A (en) | Method for preparing hybrid flocculant by use of attapulgite | |
| CN108658199A (en) | Polyferric Sulfate-cornstarch graft composite flocculant and its preparation method and application | |
| JP2013215708A (en) | Amphoteric water-soluble polymer flocculant and method for dehydrating sludge by using the same | |
| CA2830294C (en) | Process for improving the flow rate of an aqueous dispersion | |
| CN104817251B (en) | A kind of composite high-molecular sludge dehydrating agent and preparation method thereof | |
| CN107652446A (en) | A kind of method of rubbish concentrate recycling | |
| CN106927548B (en) | Composite decoloring coagulant, preparation method and decoloring method thereof | |
| CN109608020A (en) | A kind of composite flocculation agent and preparation method thereof for Treatment of Sludge | |
| JP5038587B2 (en) | Dewatering method for sewage digested sludge | |
| JP5843428B2 (en) | Coagulation treatment method for colored wastewater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |