CN100340506C - Sludge dewatering agent and its preparation method - Google Patents
Sludge dewatering agent and its preparation method Download PDFInfo
- Publication number
- CN100340506C CN100340506C CNB2004100507385A CN200410050738A CN100340506C CN 100340506 C CN100340506 C CN 100340506C CN B2004100507385 A CNB2004100507385 A CN B2004100507385A CN 200410050738 A CN200410050738 A CN 200410050738A CN 100340506 C CN100340506 C CN 100340506C
- Authority
- CN
- China
- Prior art keywords
- sludge
- reaction
- add
- agent
- dehydrating agent
- 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
- Separation Of Suspended Particles By Flocculating Agents (AREA)
- Treatment Of Sludge (AREA)
Abstract
The present invention relates to a cationic polymer dehydrating agent for sludge dehydration, which uses anion or non-ion polyacrylamide, methanal, organic amine and fresh water as raw materials, and uses amine methyl polyacrylamide obtained by the reaction of a small amount of chelator and reaction promoter under certain temperature as the colloid water solution of a main component in an auxiliary mode. The present invention has the characteristics of simple technology and equipment, smooth reaction processes, easy operation, etc., and the effect is better when the cationic polymer dehydrating agent is used by matching with the organic flocculant of the patent 98121074.0 of China. A sludge dehydration experiment of an oil refinery indicates that the treatment effect of the sludge dehydrating agent of the present invention is better than that of import medicament under the condition of the same medicament adding quantity, filtered liquid COD after treatment is lower than 2000 mg/l basically, and oil content is beneath 1000 mg/l. The present invention can be applied to sewage and sludge treatment of industry of petroleum, chemical industry, etc.
Description
Technical field
The present invention relates to a kind of sludge dehydrating agent and preparation method thereof, specifically cationic polymers type sludge dehydrating agent and preparation method thereof particularly is used for cation type polymer dewatering agent of oily sludge dehydration and preparation method thereof at oil, chemical industry.
Background technology
In refining of petroleum and wastewater treatment process thereof, there is a large amount of oily sludges to produce, as API oil trap bed mud, dissolved air floatation scum silica frost, electric desalting sump oil, oil tank bed mud and residual active sludge etc.Because the technological process difference that oily sludge produces, its oil-containing, moisture difference are bigger, and wherein oil is made up of hundreds of dissimilar organic compound, and majority is poisonous and harmful and is difficult to biodegradable material.Solid particulate in mud, is emulsified state Gu oil-water-three mixes with minimum particle distribution in the oily sludge, and environment is had great hazardness.
The volume and the water ratio of mud have direct relation, and when moisture percentage in sewage sludge was 98.8%, sludge volume was 100 cubic metres, and when water ratio dropped to 80%, sludge volume had only 1 cubic metre.Therefore carrying out processed before the final processing of mud is absolutely necessary.The effect of dewatering agent be exactly in and the electric charge of solid particles band, the net connection is built bridge, condense thereby make between the molecule of mud, finally become macrobead, thereby improve its solid-liquid separation performance.
CN1247838A has disclosed a kind of cationic high-molecular flocculant that is used for the sewage disposal aspect, it be adopt with the air in the reactor by nitrogen replacement after, at 2～3kg/cm
2Nitrogen protection under finish reaction.And reaction raw materials formaldehyde, the dimethylamine mode that adopts segmentation to add, technological process is loaded down with trivial details.CN1305976A has disclosed a kind of treatment process of mud.It is to adopt in mud behind the adding ferrous sulfate, add the cationic-type polyacrylamide flocculation agent again, and the mud after will flocculating to pass through pressure-filtering separating machine.Through behind the isolating clod natural air drying, pulverize with Universalpulverizer, and after adding a certain amount of nitrogen, phosphorus, potash fertilizer therein, as fertilizer sources uses.This method can cause secondary environmental pollution.CN1248173A is used in combination with cationic polymer flocculent or inorganic flocculating agent with sulfonated styrene polymer and/or its salt, as sludge dehydrating agent.CN1464887A is a dewatering agent with the modifier of polyalkyleneimine, is mainly used in the paper making raw material pretreating reagent.The dewatering of above-mentioned dewatering agent needs further to improve.
Summary of the invention
The invention provides a kind of cation type polymer that is used for sludge dewatering and preparation method thereof, when sludge treatment, can remove the interstitial water in the slag effectively, the conglobation property of slag is good, thereby improves the dehydrating effect of mud.The cation type polymer of the sludge dewatering that the present invention obtains, under the condition of identical added amount of chemical, treatment effect is better than the import medicament; Liquid COD is lower than 2000mg/L substantially after the filter after it is handled, and oil-contg is below 1000mg/L.The present invention also provides a kind of composite sludge dehydrant.
Sludge dehydrating agent of the present invention is the colloid aqueous solution of cationic polymers, has following structural unit in the cationic polymers:
The kinematic viscosity of dewatering agent is 100～600mm
2/ s, cationic degree are 10～30mmol/g.The weight concentration of cationic polymers is 0.05%～3%, is preferably 0.1%～1%.The unitary quantity of said structure generally can be 10,000～280,000 in the cationic polymers.
The unreacted matters that adds in the preparation process can be used as the part of dewatering agent, needn't separate.
The preparation process of above-mentioned sludge dewatering cationic polymers is as follows:
Fresh water is added in the reactor, under condition of stirring, equably negatively charged ion or non-ionic polyacrylamide are added in the reactor.After treating that it dissolves fully, add mineral alkali, adjust the pH value of solution.Add sequestrant, reaction promotor then, control reaction temperature adds formaldehyde, organic amine in the reactor, behind the reaction certain hour, adds the terminator stopped reaction, can obtain this product.Reaction formula is as follows:
Wherein the best proportioning of each reaction raw materials is negatively charged ion or non-ionic polyacrylamide: formaldehyde: organic amine: fresh water: sequestrant: reaction promotor: terminator is=1: 0.5～2.5: 0.5～2.5: 100～5000: 0.005～0.05: 0.005～0.05: 10～500 (mol ratios) are preferably 1: 0.5～2.0: 0.5～2.0: 500～4000: 0.005～0.01: 0.005～0.01: 10～500 (mol ratios).Mineral alkali is a kind of of sodium hydroxide, potassium hydroxide; Organic amine is one or both of dimethylamine, diethylamine, Dyhard RU 100; Sequestrant is edta and its sodium salt, ethylene diaminetetraacetic acid and sodium salt thereof, diethylenediamine pentaacetic acid and sodium salt thereof; Reaction promotor is persulphate or water-soluble azo class material, wherein persulphate is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate, water-soluble azo class thing is N, N-dihydroxy ethyl azo-bis-isobutyrate hydrochloride, the two amidine propane dihydrochlorides, 2 of azo, one or more of two (2-methyl 2-the amidine propane)-hydrochlorides of 2-azo.Terminator is that hydrochloric acid, vitriolic are a kind of.
Add mineral alkali, adjust the pH value of solution, be controlled between 7～14, preferably between 8～13; Temperature of reaction is controlled between 20 ℃～80 ℃, preferably between 20 ℃～70 ℃; The dissolution time of negatively charged ion or non-ionic polyacrylamide is controlled at 1h～6h, preferably is controlled at 2h～5h; Reaction times is controlled at 2h～10h, preferably is controlled at 2h～8h.
Composite sludge dehydrant of the present invention mixes the organic floculant of the present invention above-mentioned cationic polymers and Chinese patent 98121074.0 be the present invention compound dewatering agent by volume at 5～50: 1, preferred 20～40: 1.Certainly, can also add the organic and inorganic flocculating agent of other routine of this area.
98121074.0 organic floculant have following structure:
R wherein
1, R
2, R
4, R
6Be respectively H or C
1-3Wherein any one of hydroxyalkyl; R
3Be amido or the amido that has the hydroxyalkyl replacement; R
5, R
8It is respectively alkylidene group; R
7Be ketonic oxygen or hydroxyalkyl oxygen; M=5～15, n=10～20.Concrete preparation process and condition can be with reference to this patent specification and embodiment.
Application in cation type polymer sludge dehydrating agent of the present invention or the application of composite sludge dehydrant in sludge dewatering, particularly oily sludge dehydration.Above-mentioned dewatering agent is added in the mud that needs to handle, and stirring gets final product, and the add-on of dewatering agent in mud is generally 3～1000 μ g/g, is preferably 5～500 μ g/g.
Cation type polymer sludge dehydrating agent use properties of the present invention is good, and the use properties behind compound certain organic floculant is better.Cation type polymer preparation technology of the present invention, equipment are simple, and reaction process is steady, characteristics such as easy handling.Prove by lab beaker evaluation test and test in place refinery mud, the cation type polymer of the sludge dewatering that the present invention obtains, the cationic degree height, treatment effect is good, and the mud conglobation property is good, and closely knit.It is better that this cation type polymer and Chinese patent 98121074.0 demulsification type organic flocculants are used effect.It can be applied in sewage, the sludge treatment of industries such as oil, chemical industry.
Embodiment
Below by embodiment sludge dehydrating agent of the present invention and preparation process and use properties are described.
Embodiment 1
In reactor, add the 499kg fresh water, start and stir, add non-ionic polyacrylamide 1.1kg.After treating that it dissolves fully, add 0.1kg sodium hydroxide (chemical pure), the pH value of adjusting solution is 11～12.Add 0.5g disodium ethylene diamine tetraacetate (chemical pure) then, add 0.8g ammonium persulphate (chemical pure), control reaction temperature is at 30 ℃, with 1000mL formaldehyde (chemical pure), 1500mL diethylamine (chemical pure) mixed after, add in the reactor, the reaction times is 4h.Add 1500mL hydrochloric acid (chemical pure) stopped reaction at last, can obtain this product.Dewatering agent-1.
Embodiment 2
In reactor, add the 498kg fresh water, start and stir, add non-ionic polyacrylamide 1.35kg.After treating that it dissolves fully, add 0.17kg sodium hydroxide (chemical pure), the pH value of adjusting solution is 9～10.Add 0.5g disodium ethylene diamine tetraacetate (chemical pure) then, add 1.4gN, N-dihydroxy ethyl azo-bis-isobutyrate hydrochloride (chemical pure), control reaction temperature is at 50 ℃, with 2200mL formaldehyde (chemical pure), 1800mL dimethylamine (chemical pure), 1200mL diethylamine (chemical pure) mixed after, add in the reactor, the reaction times is 3h.Add 2500mL hydrochloric acid (chemical pure) stopped reaction at last, can obtain this product.Dewatering agent-2.
Embodiment 3
In reactor, add the 987kg fresh water, start and stir, add anionic polyacrylamide 2.85kg.After treating that it dissolves fully, add 0.25kg sodium hydroxide (chemical pure), the pH value of adjusting solution is 11～12.Add 0.4g disodium ethylene diamine tetraacetate (chemical pure) then, add 0.5g ammonium persulphate (chemical pure), add 0.6gN, N-dihydroxy ethyl azo-bis-isobutyrate hydrochloride (chemical pure), control reaction temperature is at 45 ℃, with 2500mL formaldehyde (chemical pure), 4200mL diethylamine (chemical pure) mixed after, add in the reactor, the reaction times is 3h.Add 4000mL hydrochloric acid (chemical pure) stopped reaction at last, can obtain this product.Dewatering agent-3.
Embodiment 4
In reactor, add the 986kg fresh water, start and stir, add anionic polyacrylamide 3.88kg.After treating that it dissolves fully, add 0.31kg sodium hydroxide (chemical pure), the pH value of adjusting solution is 9～10.Add 0.8g disodium ethylene diamine tetraacetate (chemical pure) then, add 0.8g ammonium persulphate (chemical pure), add 0.6gN, N-dihydroxy ethyl azo-bis-isobutyrate hydrochloride (chemical pure), control reaction temperature is at 55 ℃, with 3200mL formaldehyde (chemical pure), 3200mL dimethylamine (chemical pure), 1800mL diethylamine (chemical pure) mixed after, add in the reactor, the reaction times is 2h.Add 5200mL hydrochloric acid (chemical pure) stopped reaction at last, can obtain this product.Dewatering agent-4.
Embodiment 5
With the demulsification type organic flocculant of dewatering agent-2 with Chinese patent 98121074.0 embodiment 3, mix by 30: 1 (volume ratio), obtain dewatering agent-5.
Embodiment 6
With the demulsification type organic flocculant of dewatering agent-4 with Chinese patent 98121074.0 embodiment 4, mix by 25: 1 (volume ratio), obtain dewatering agent-6.
Each embodiment of table one obtains the dewatering agent product index
| Index | Dewatering agent 1 | Dewatering agent 2 | Dewatering agent 3 | Dewatering agent 4 | Dewatering agent 5 | Dewatering agent 6 |
| Kinematic viscosity cp | 322.9 | 407.6 | 436.9 | 528.7 | 469.9 | 496.3 |
| Cationic degree mmol/g | 11.9 | 14.8 | 17.3 | 21.4 | 13.6 | 18.4 |
Embodiment 7
Get certain refinery oily sludge and carry out dehydration test.
Table two is handled refinery oily sludge experimental result
| The medicament title | Dosage (μ g/g) | Moisture percentage in sewage sludge wt% | Filter back liquid (mg/L) | Remarks | ||
| Before the processing | After the processing | Oil-contg | CODcr | |||
| Primary sludge | 0 | 2820 | 5551 | |||
| PAC | 2000 | 99.5 | 85.2 | 1434 | 2659 | Mud cake is loose |
| PAC | 3000 | 99.5 | 82.1 | 588.0 | 1322 | Mud cake is loose |
| Dewatering agent 1 | 100 | 99.5 | 76.8 | 87.2 | 967 | Mud cake is loose |
| Dewatering agent 2 | 100 | 99.5 | 75.2 | 60.4 | 964 | Mud cake is more closely knit |
| Dewatering agent 3 | 100 | 99.5 | 71.5 | 30.6 | 808 | Mud cake is closely knit |
| Dewatering agent 4 | 100 | 99.5 | 70.7 | 21.9 | 297 | Mud cake is closely knit |
| Dewatering agent 5 | 100 | 99.5 | 73.6 | 19.6 | 232 | Mud cake is closely knit |
| Dewatering agent 6 | 100 | 99.5 | 66.5 | 14.3 | 211 | Mud cake is closely knit |
| The import medicament | 100 | 99.5 | 74.7 | 42.4 | 911 | Mud cake is closely knit |
Embodiment 8
Certain sewage from oil refinery is handled an on-the-spot beaker evaluation test
Table three is handled the on-the-spot beaker evaluation test of refinery oily sludge result
| The medicament title | Dosage (μ g/g) | Filter back liquid (mg/L) | Estimate phenomenon | |
| CODcr | Oil-contg | |||
| On-the-spot import medicament | 50 | 942.37 | 65 | Breakdown of emulsion, Cheng Xiaotuan, eakiness |
| 70 | 990.45 | 60 | Breakdown of emulsion becomes agglomerate, eakiness | |
| 100 | 923.14 | 75 | Breakdown of emulsion becomes agglomerate, and is closely knit | |
| Mean value | 73.3 | 952.0 | 65.0 | |
| Dewatering agent 4 | 24 | 855.82 | Breakdown of emulsion, Cheng Xiaotuan, closely knit | |
| 40 | 788.51 | 28 | Breakdown of emulsion becomes agglomerate, and is closely knit | |
| 56 | 836.59 | 28 | Breakdown of emulsion becomes agglomerate, and is closely knit | |
| Mean value | 40.0 | 827.0 | 28.3 | |
| On-the-spot import medicament | 50 | 885 | 22 | Breakdown of emulsion, Cheng Xiaotuan |
| 40 | 1019 | 80 | Little breakdown of emulsion, not agglomerating | |
| 30 | 1096 | 149 | Little breakdown of emulsion, not agglomerating | |
| Mean value | 40.0 | 1000.0 | 83.7 | |
| Dewatering agent 4 | 24 | 990 | 14 | Breakdown of emulsion becomes agglomerate, and is closely knit |
| 20 | 942 | 56 | Breakdown of emulsion becomes agglomerate, and is closely knit | |
| 16 | 1067 | 156 | Breakdown of emulsion, agglomerating, closely knit | |
| Mean value | 20.0 | 1000.0 | 75.3 | |
Annotate: these data are analyzed by the refinery monitoring station.
Claims (14)
1, a kind of sludge dehydrating agent is characterized in that sludge dehydrating agent is the colloid aqueous solution of cationic polymers, has following structural unit in the cationic polymers:
The weight concentration of cationic polymers is 0.05%～3%, and the kinematic viscosity of dewatering agent is 100～600mm
2/ s, cationic degree is 10～30mmol/g, the quantity of structural unit is 10,000～280,000 in the cationic polymers.
2, according to the described sludge dehydrating agent of claim 1, it is characterized in that the unreacted matters that in preparation process, adds a part as dewatering agent, needn't separate, the weight concentration of cationic polymers is 0.1%～1%.
3, the preparation method of the described sludge dehydrating agent of a kind of claim 1 is characterized in that adopting being prepared as follows process: fresh water is added in the reactor, under condition of stirring, equably negatively charged ion or non-ionic polyacrylamide are added in the reactor; After treating that it dissolves fully, add mineral alkali, the pH value of adjusting solution is 7～14; Add sequestrant, reaction promotor then, control reaction temperature adds formaldehyde, organic amine in the reactor at 20 ℃～80 ℃, behind reaction 2h～10h, adds the terminator stopped reaction, can obtain the sludge dehydrating agent product; Wherein said reaction promotor is persulphate or water-soluble azo class material; Described terminator is that hydrochloric acid, vitriolic are a kind of.
4, in accordance with the method for claim 3, the mole proportioning that it is characterized in that described each raw material is negatively charged ion or non-ionic polyacrylamide: formaldehyde: organic amine: fresh water: sequestrant: reaction promotor: terminator=1: 0.5～2.5: 0.5～2.5: 100～5000: 0.005～0.05: 0.005～0.05: 10～500.
5, in accordance with the method for claim 3, the mole proportioning that it is characterized in that described each raw material is negatively charged ion or non-ionic polyacrylamide: formaldehyde: organic amine: fresh water: sequestrant: reaction promotor: terminator=1: 0.5～2.0: 0.5～2.0: 500～4000: 0.005～0.01: 0.005～0.01: 10～500.
6, in accordance with the method for claim 3, it is characterized in that described negatively charged ion or non-ionic polyacrylamide; Mineral alkali is a kind of of sodium hydroxide, potassium hydroxide; Organic amine is one or both of dimethylamine, diethylamine, Dyhard RU 100; Sequestrant is edta and its sodium salt, ethylene diaminetetraacetic acid and sodium salt thereof, diethylenediamine pentaacetic acid and sodium salt thereof.
7, in accordance with the method for claim 6, it is characterized in that described persulphate is one or more of Potassium Persulphate, ammonium persulphate, Sodium Persulfate, water-soluble azo class thing is N, N-dihydroxy ethyl azo-bis-isobutyrate hydrochloride, the two amidine propane dihydrochlorides, 2 of azo, one or more of two (2-methyl 2-the amidine propane)-hydrochlorides of 2-azo.
8, in accordance with the method for claim 3, the dissolution time that it is characterized in that described negatively charged ion or non-ionic polyacrylamide is controlled at 1h～6h.
9, in accordance with the method for claim 8, the pH value that it is characterized in that described adding mineral alkali adjustment solution is controlled between 8～13, temperature of reaction is controlled between 20 ℃～70 ℃, the dissolution time of negatively charged ion or non-ionic polyacrylamide is controlled at 2h～5h, and the reaction times is controlled at 2h～8h.
10, a kind of composite sludge dehydrant is characterized in that comprising the sludge dehydrating agent of claim 1 and the flocculation agent with following structure, and both volume ratios are 5～50: 1.
R wherein
1, R
2, R
4, R
6Be respectively H or C
1-3Wherein any one of hydroxyalkyl; R
3Be amido or the amido that has the hydroxyalkyl replacement; R
5, R
8It is respectively alkylidene group; R
7Be ketonic oxygen or hydroxyalkyl oxygen; M=5～15, n=10～20.
11,, it is characterized in that described volume ratio is 20～40: 1 according to the described dewatering agent of claim 10.
12, claim 1,2, the application of the described dewatering agent of 10 and 11 arbitrary claims in the oily sludge dehydration.
13,, it is characterized in that the add-on of described dewatering agent in mud is 3～1000 μ g/g according to the described application of claim 12.
14,, it is characterized in that the add-on of described dewatering agent in mud is 5～500 μ g/g according to the described application of claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100507385A CN100340506C (en) | 2004-10-29 | 2004-10-29 | Sludge dewatering agent and its preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2004100507385A CN100340506C (en) | 2004-10-29 | 2004-10-29 | Sludge dewatering agent and its preparation method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1769221A CN1769221A (en) | 2006-05-10 |
| CN100340506C true CN100340506C (en) | 2007-10-03 |
Family
ID=36750816
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2004100507385A Active CN100340506C (en) | 2004-10-29 | 2004-10-29 | Sludge dewatering agent and its preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100340506C (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101337759B (en) * | 2008-08-18 | 2010-06-02 | 哈尔滨工业大学 | Dewatering process for domestic sludge |
| CN101492234B (en) * | 2008-12-10 | 2011-04-20 | 乔占印 | Production process for urban sewage water, sewage sludge dehydrating agent and method of use thereof |
| CN103979777B (en) * | 2013-07-18 | 2015-11-25 | 俞元洪 | A kind of rapid dehydration of sludge curing |
| CN107601797B (en) * | 2017-11-03 | 2020-12-25 | 北京博惠通科技发展有限公司 | Oil sludge treating agent and oil sludge treating method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63242309A (en) * | 1987-03-31 | 1988-10-07 | Sanyo Chem Ind Ltd | Dehydrating agent and dehydration process |
| US5262064A (en) * | 1991-09-26 | 1993-11-16 | Florida Institute Of Phosphate Research | Dewatering method and agent |
| US5707533A (en) * | 1996-07-09 | 1998-01-13 | Betzdearborn Inc. | Process for the preparation of aqueous dispersion polymers |
| CN1196334A (en) * | 1997-04-11 | 1998-10-21 | 广州市环境保护科学研究所 | Method for preparing cation/amphoteric graft polyacrylamide flocculating agent |
| CN1247838A (en) * | 1998-09-17 | 2000-03-22 | 吕广明 | Cationic high-molecular flocculant and its preparation |
-
2004
- 2004-10-29 CN CNB2004100507385A patent/CN100340506C/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63242309A (en) * | 1987-03-31 | 1988-10-07 | Sanyo Chem Ind Ltd | Dehydrating agent and dehydration process |
| US5262064A (en) * | 1991-09-26 | 1993-11-16 | Florida Institute Of Phosphate Research | Dewatering method and agent |
| US5707533A (en) * | 1996-07-09 | 1998-01-13 | Betzdearborn Inc. | Process for the preparation of aqueous dispersion polymers |
| CN1196334A (en) * | 1997-04-11 | 1998-10-21 | 广州市环境保护科学研究所 | Method for preparing cation/amphoteric graft polyacrylamide flocculating agent |
| CN1247838A (en) * | 1998-09-17 | 2000-03-22 | 吕广明 | Cationic high-molecular flocculant and its preparation |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1769221A (en) | 2006-05-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107082526B (en) | Pretreatment method of waste emulsion | |
| CN109574394B (en) | Fracturing flowback fluid treatment method | |
| CN100497415C (en) | Cationic dehydrating agent preparation method | |
| Luna et al. | Use of zeolitised coal fly ash for landfill leachate treatment: A pilot plant study | |
| EP3305732A1 (en) | Wastewater treatment method | |
| CN105060604A (en) | Purification process for coal fired power plant desulphurization sewage | |
| CN100340506C (en) | Sludge dewatering agent and its preparation method | |
| CN102992458A (en) | Flocculating agent for treating leather waste water | |
| CN103102035B (en) | High acid crude oil electric desalting wastewater treatment method | |
| Sharma et al. | Application of waterworks sludge in wastewater treatment plants | |
| EP2291333B1 (en) | Process for reducing bulking sludge in activated sludge wastewater treatment | |
| CN100579925C (en) | Method for preparing amphiprotic sludge dehydrant | |
| CN100579623C (en) | Method for preparing composite sludge dehydrant | |
| CN110040880A (en) | The processing method of desulfurization wastewater | |
| CN100497219C (en) | Preparation method of sludge dewatering agent | |
| CN100513338C (en) | Polymer for sludge dewatering and preparation process thereof | |
| CN1138706C (en) | Compound oil-bearing effluent flucculant | |
| CN110577254A (en) | water purifying agent for coal chemical industry, coking chemical industry and other chemical industries and preparation method thereof | |
| CN110642442A (en) | Gas production wastewater treatment process containing foam discharging agent | |
| CA2919656C (en) | Enhancement of wastewater sludge dewatering using soy flour or soy protein | |
| CN113415866B (en) | Method and device for removing silicate in wastewater | |
| CN109160714B (en) | Gas field oily sludge conditioning and dewatering method | |
| CN106335969B (en) | High-polymer-content heavy oil sewage treating agent | |
| Piaskowski et al. | Application of iron sludge from water purification plant for pretreatment of reject water from sewage sludge treatment | |
| EP2611742A1 (en) | Composition, use thereof and process for reducing bulking sludge and/or foaming and preparation of the composition |
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 |