CN101838040A - Method for purifying seawater by taking carboxymethyl chitosan as flocculant - Google Patents
Method for purifying seawater by taking carboxymethyl chitosan as flocculant Download PDFInfo
- Publication number
- CN101838040A CN101838040A CN 201010145233 CN201010145233A CN101838040A CN 101838040 A CN101838040 A CN 101838040A CN 201010145233 CN201010145233 CN 201010145233 CN 201010145233 A CN201010145233 A CN 201010145233A CN 101838040 A CN101838040 A CN 101838040A
- Authority
- CN
- China
- Prior art keywords
- seawater
- carboxymethyl chitosan
- aqueous solution
- poly
- chitosan
- 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.)
- Pending
Links
Abstract
The invention relates to a method for purifying seawater by taking carboxymethyl chitosan as a flocculant. The method comprises the steps of: preparing water-soluble carboxymethyl chitosan (CMC) and polyferric chloride (PFC) into aqueous solution respectively; adding both the aqueous solution into the seawater one after another to obtain a mixture; precipitating the mixture after stirring; and removing the precipitate to obtain purified seawater, wherein the mass ratio of the added CMC to the PFC to the seawater is 1ton:2-2.5g:10-20g; the aqueous solution of carboxymethyl chitosan contains 2g of carboxymethyl chitosan per liter water; and the aqueous solution of the PFC contains 5-10g of the PFC per liter water respectively. The method for purifying the seawater has the advantages of simple technological operation, readily available raw material, no secondary pollution to water body and high purification efficiency. The method not only can be used for pretreating of the seawater purifying but also can be used for treating sewage water discharged after seawater utilization, and has a wide popularization and application prospect.
Description
Technical field
The present invention relates to the direct seawater utilization technology, especially relate to the method for purifying seawater that utilizes flocculation agent.
Background technology
Coastal cities are faced the severe situation that is becoming tight water supply day and are directly taken the advantageous advantage of seawater, and it is imperative actively to promote the application of seawater in industry and urban life.Adopt sea water desaltination and direct seawater utilization technology to become the effective way of alleviating the Freshwater resources short supply state.The matter of utmost importance that the present age, water resources faced is a water quality, is the problem that water quality generally worsens, and seawater quality is no exception.The importance of water quality is not reach the water resources of certain water quality standard, and the water yield is many more also of no use.The deterioration of immediate offshore area seawater quality has not only reduced the chresard of seawater resources, and has higher requirement for seawater resources utilize Study on Technology.
The used seawater of seawater utilization engineering is generally coastal seawater, because immediate offshore area more serious contamination, coastal seawater must could use through after the purifying treatment, and its purifying treatment effect directly affects the operation condition and the running cost of the follow-up flow process of seawater utilization engineering.So developing innoxious seawater cleaning new and high technology has been trend of the times.
Flocculation sedimentation is the water purification processing method that generally adopts at present, utilizes flocculation agent that suspended particles are gathered and becomes big, and then form floc sedimentation and sedimentation, reaches the effect of purifying waste water.The flocculation agent that flocculation sedimentation adopts is broadly divided into inorganic flocculating agent, organic synthesis polymeric flocculant and natural macromolecule flocculating agent three classes.Inorganic flocculating agent as Tai-Ace S 150, polymerize aluminum chloride, bodied ferric sulfate etc., can be given in the water treatment and bring a large amount of mineral ions, and the part mineral ion can influence biological growing and harm humans health, and environment is produced certain secondary pollution.Organic polymer coargulator than inorganic flocculating agent have that the adsorption bridging ability is strong, flocculating effect good, applied widely, adding less, flocculation rate fast, pH value and advantage such as temperature effect is less, the flco filterableness of formation is good.Synthetic organic polymer water conditioner based on polyacrylamide (PAM), though have adding less, flco is thick, be subjected to plurality of advantages such as water quality impact is little, but there is certain problem in it, show selectivity significantly as colloid to flocculation, the limpid degree of supernatant liquid after the flocculation is relatively poor, itself be difficult for being influenced subsequent disposal by biological degradation, the most alarming is whether the organic synthesis polymeric flocculant can produce secular influence to HUMAN HEALTH.Polyacrylamide amine monomers itself is poisonous, more or less remains in the polymkeric substance, influences its security when water treatment.Natural macromolecule flocculating agent is that employing nature natural high molecular substance is that raw material (as starch, xylogen, chitin, vegetable jelly etc.) is through extracting the water treatment agent that makes after the modification, nontoxic, the energy complete biodegradable, have long molecular chain and more functional group, the adsorption-condensation organic granular grows up to thick bridge formation flocs unit (alumen ustum) rapidly, and can not produce secondary pollution to environment, in water treatment applications, more and more be subject to people's attention.
Chitosan is the nitrogenous natural organic-compound of quantity maximum beyond the isolating protein, many hydroxyls, amino and N-kharophen are distributing on the molecular chain, have excellent biological compatibility and biodegradability, be the novel kind that has good flocculating property in the natural macromolecule flocculating agent, the application in water treatment is increasingly extensive.In recent years, the applied research in water treatment is very active to chitosan and derivative thereof.Yet the solubility property of chitosan is relatively poor, can only be dissolved in some diluted acid, water insoluble, basic solution and most of organic solvent, and the obstruction of oneself factors such as the solvability of chitosan has greatly limited the popularity of its application.Can effectively improve its solvability by chitosan being carried out chemically modified formation chitosan derivatives.
Although it is increasingly extensive that natural macromolecule flocculating agent is used for the application of purged with fresh water processing, but, still be not specifically designed at present the natural macromolecule flocculating agent and the seawater cleaning treatment process thereof of seawater cleaning, use existing fresh water flocculation agent purifying sea water often not fully up to expectations, dosage is big, and the settling of generation is more and easily water body is caused secondary pollution.Seawater is one and contains multiple inorganics and organic complexity and huge solution system that the colloidal flocculating settling has its particular law in the seawater.How selective flocculant is the key that reduces the sea water preprocessing cost.Characteristic according to seawater, development had not only had stronger charge neutrality ability and adsorptive power, but also has possessed stability and security preferably, do not produce the natural macromolecule flocculating agent and the seawater cleaning treatment process thereof of the special use of secondary pollution, utilized in the technical study at seawater resources to have great importance.
Summary of the invention
At the flocculation agent and the application method thereof that also are not specifically designed to seawater cleaning in the prior art, the present invention releases and a kind of chitosan carboxyl methylation derivant and poly-ferric chloride is used in combination, and forms and utilizes new natural macromolecule flocculating agent, possesses better stability and security, do not produce the special-purpose seawater cleaning treatment process of secondary pollution.
Method for purifying seawater with carboxymethyl chitosan as flocculant involved in the present invention, its step comprises: water-soluble carboxymethyl chitosan (CMC) and poly-ferric chloride (PFC) are mixed with the aqueous solution respectively, successively throw in the seawater, quiet heavy after stirring, the seawater that disgorging is purified.The mass ratio of cm-chitosan, poly-ferric chloride and the seawater of throwing in is: seawater: cm-chitosan: poly-ferric chloride=1 ton: 2～2.5 grams: 10～20 restrain.
The carboxymethyl chitosan sugar aqueous solution that is mixed with is to contain 2 gram cm-chitosan in 1 premium on currency; The poly-ferric chloride aqueous solution that is mixed with is the solution that contains 5～10 gram poly-ferric chlorides in 1 premium on currency.
The degree of substitution by carboxymethyl of selected cm-chitosan is 0.6～0.8, and deacetylation is 50～90%; Ferric oxide (Fe in the selected poly-ferric chloride
2O
3) be 14～15%, basicity 5.3～6.6%.
The pH of selected seawater is 5～7, and the acid of adjusting seawater pH is selected from dilute hydrochloric acid, dilute sulphuric acid or boric acid, and the alkali of adjusting seawater pH is selected from sodium hydroxide, potassium hydroxide or ammonium hydroxide.
When in seawater, throwing in the carboxymethyl chitosan sugar aqueous solution and the poly-ferric chloride aqueous solution, by above-mentioned mass ratio, throw in the polymerization ferric chloride aqueous solutions earlier, in the time of 300 rpms, stirred 1-2 minute fast, throw in the carboxymethyl chitosan sugar aqueous solution again, stirred at a slow speed 15-20 minute when reducing rotating speed to 60 rpm, quiet heavy 15-20 minute, the seawater that is purified of disgorging then.
The method for purifying seawater technological operation with carboxymethyl chitosan as flocculant that the present invention relates to is simple and easy, and raw material sources are convenient, and dosage is little, and is with low cost; The flocculation agent sedimentation speed is fast, is easy to biological degradation, avoids water body is caused secondary pollution; The purification efficiency height, turbidity removal rate reaches more than 90% in the seawater, COD
MnClearance reaches more than 51%.Present method also can be used for the processing of sewer behind the seawater utilization except that being used for the seawater cleaning pre-treatment, have broad prospect for its application.
Embodiment
In conjunction with the embodiments concrete technical scheme of the present invention is described further.
Embodiment 1
Get 2 gram cm-chitosan (degree of substitution by carboxymethyl is 0.75, and deacetylation is 84.4%) and 5 gram poly-ferric chloride (Fe
2O
3Ferric oxide is 14%, basicity 5.4%) be dissolved in respectively in 1 liter the deionized water and be mixed with solution.
Get 1 and die that (the seawater quality parameter: turbidity is 30.2～50.5NTU to Tanggu, Tianjin coastal seawater, and the pH value is 7.49～8.14, COD
MnBe 2.73～4.61mg/L) to put into agitator, and drip dilute hydrochloric acid seawater pH value is transferred to 6.5.
Getting 4 milliliters of poly-ferric chloride solution of preparation throws in to the seawater of agitator, stirred 2 minutes fast with 300 rpms, produce the great quantity of floc particle, add 1 milliliter of carboxymethyl chitosan sugar soln of preparation again, stirred quiet heavy 20 minutes at a slow speed 20 minutes with 60 rpms.Get supernatant liquor and measure turbidity, the COD of seawater
Mn, calculating turbidity removal rate is 92.5%, COD
MnClearance is 51.5%.
Embodiment 2
With 1 gram cm-chitosan (degree of substitution by carboxymethyl is 0.68, and deacetylation is 78.2%) and 7 gram poly-ferric chloride (Fe
2O
3Ferric oxide is 14.3%, basicity 5.8%) be dissolved in respectively in 1 liter the deionized water and be mixed with solution.
Get 1 and die that (the seawater quality parameter: turbidity is 30.2-50.5NTU to Tanggu, Tianjin coastal seawater, and the pH value is 7.49-8.14, COD
MnBe 2.73-4.61mg/L) put into agitator, and the dropping dilute sulphuric acid transfers to 5.6 with seawater pH value.
Getting 2.5 milliliters of poly-ferric chloride solution of preparation throws in to the seawater of agitator, stirred 2 minutes fast with 300 rpms, produce the great quantity of floc particle, 3 milliliters of carboxymethyl chitosan sugar solns that add preparation again, stirred at a slow speed 1 minute with 60 rpms, 3 milliliters of carboxymethyl chitosan sugar solns that add preparation again reduce rotating speed to 60 and rpm stirred quiet heavy 20 minutes at a slow speed 20 minutes.Get supernatant liquor and measure turbidity, the COD of seawater
Mn, calculating turbidity removal rate is 92.5%, COD
MnClearance is 51.5%.
Embodiment 3
With 2 gram cm-chitosan (degree of substitution by carboxymethyl is 0.82, and deacetylation is 78.2%) and 10 gram poly-ferric chloride (Fe
2O
3Ferric oxide is 14.8%, basicity 6.1%) be dissolved in respectively in 1 liter the deionized water and be mixed with solution.
Get 1 and die that (the seawater quality parameter: turbidity is 35.5NTU to Tanggu, Tianjin coastal seawater, and the pH value is 8.1, COD
MnBe 3.71mg/L) put into agitator, and dropping dilute hydrochloric acid transfers to 6.7 with seawater pH value.
Getting 1.5 milliliters of poly-ferric chloride solution of preparation throws in to the seawater of agitator, stirred 2 minutes fast with 300 rpms, produce the great quantity of floc particle, 2 milliliters of carboxymethyl chitosan sugar solns that add preparation again, stirred at a slow speed 1 minute with 60 rpms, 3 milliliters of carboxymethyl chitosan sugar solns that add preparation again reduce rotating speed to 60 and rpm stirred quiet heavy 15 minutes at a slow speed 20 minutes.The turbidity of getting supernatant liquor mensuration seawater is 2.5NTU, COD
MnBe 1.8mg/L.
Claims (5)
1. the method for purifying seawater with carboxymethyl chitosan as flocculant is characterized in that, water-soluble carboxymethyl chitosan and poly-ferric chloride are mixed with the aqueous solution respectively, successively throws in the seawater, and is quiet heavy after stirring, the seawater that disgorging is purified; The mass ratio of cm-chitosan, poly-ferric chloride and the seawater of throwing in is: seawater: cm-chitosan: poly-ferric chloride=1 ton: 2～2.5 grams: 10～20 restrain; The carboxymethyl chitosan sugar aqueous solution that is mixed with is to contain 1～2 gram cm-chitosan in 1 premium on currency, and the poly-ferric chloride aqueous solution is to contain 5～10 gram poly-ferric chlorides in 1 premium on currency.
2. the method for purifying seawater with carboxymethyl chitosan as flocculant according to claim 1, it is characterized in that, in the described process of carboxymethyl chitosan sugar aqueous solution and the poly-ferric chloride aqueous solution being thrown in seawater respectively and stirring, throw in the poly-ferric chloride aqueous solution earlier, in the time of 300 rpms, stirred 1-2 minute fast, throw in the carboxymethyl chitosan sugar aqueous solution again, stirred at a slow speed 15-20 minute when reducing rotating speed to 60 rpm, quiet heavy 15-20 minute, the seawater that is purified of disgorging then.
3. the method for purifying seawater with carboxymethyl chitosan as flocculant according to claim 1 is characterized in that, the degree of substitution by carboxymethyl of selected cm-chitosan is 0.6～0.8, and deacetylation is 50～90%; Ferric oxide (Fe in the selected poly-ferric chloride
2O
3) be 14～15%, basicity 5.3～6.6%.
4. the method for purifying seawater with carboxymethyl chitosan as flocculant according to claim 1 is characterized in that, the pH of selected seawater is 5～7, and the acid of adjusting seawater pH is selected from dilute hydrochloric acid, dilute sulphuric acid or boric acid.
5. the method for purifying seawater with carboxymethyl chitosan as flocculant according to claim 1 is characterized in that, the pH of selected seawater is 5～7, and the alkali of adjusting seawater pH is selected from sodium hydroxide, potassium hydroxide or ammonium hydroxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010145233 CN101838040A (en) | 2010-04-13 | 2010-04-13 | Method for purifying seawater by taking carboxymethyl chitosan as flocculant |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010145233 CN101838040A (en) | 2010-04-13 | 2010-04-13 | Method for purifying seawater by taking carboxymethyl chitosan as flocculant |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101838040A true CN101838040A (en) | 2010-09-22 |
Family
ID=42741752
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010145233 Pending CN101838040A (en) | 2010-04-13 | 2010-04-13 | Method for purifying seawater by taking carboxymethyl chitosan as flocculant |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101838040A (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051332A (en) * | 2010-11-25 | 2011-05-11 | 中国海洋大学 | Collection method of oil-containing microalgae |
| CN103043763A (en) * | 2013-01-06 | 2013-04-17 | 国家海洋局天津海水淡化与综合利用研究所 | Preparation method of multi-effect seawater flocculating agent |
| CN104016454A (en) * | 2013-09-27 | 2014-09-03 | 四川景星环境科技有限公司 | Flocculation precipitant for secondary lead wastewater treatment and preparation method thereof |
| CN104310558A (en) * | 2014-09-25 | 2015-01-28 | 青岛佰众化工技术有限公司 | Industrial wastewater flocculating agent |
| CN105712450A (en) * | 2016-03-08 | 2016-06-29 | 佛山市聚成生化技术研发有限公司 | Preparation method of chitosan composite flocculant and chitosan composite flocculant prepared through same |
| CN110921843A (en) * | 2019-12-12 | 2020-03-27 | 佛山科学技术学院 | Preparation method of polymer composite flocculant for printing and dyeing sewage |
| CN112279347A (en) * | 2020-09-08 | 2021-01-29 | 广州户户通科技发展有限公司 | Efficient domestic sewage treatment agent and preparation method and application thereof |
| WO2022205535A1 (en) * | 2021-03-31 | 2022-10-06 | 广西桂柳化工有限责任公司 | Method for preparing electrolytic manganese dioxide for producing lithium manganate material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600702A (en) * | 2003-09-26 | 2005-03-30 | 国家海洋局天津海水淡化与综合利用研究所 | Flocculant for seawater and preparation method |
-
2010
- 2010-04-13 CN CN 201010145233 patent/CN101838040A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1600702A (en) * | 2003-09-26 | 2005-03-30 | 国家海洋局天津海水淡化与综合利用研究所 | Flocculant for seawater and preparation method |
Non-Patent Citations (2)
| Title |
|---|
| 《工业水处理》 20050228 刘秉涛等 羧甲基壳聚糖处理染料废水的正交试验研究 第23-25页 1-5 第25卷, 第2期 2 * |
| 《工业水处理》 20091231 樊丽华等 羧甲基壳聚糖复合絮凝剂的制备及其应用研究 第28-30页 1-5 第29卷, 第12期 2 * |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102051332A (en) * | 2010-11-25 | 2011-05-11 | 中国海洋大学 | Collection method of oil-containing microalgae |
| CN102051332B (en) * | 2010-11-25 | 2012-09-05 | 中国海洋大学 | Collection method of oil-containing microalgae |
| CN103043763A (en) * | 2013-01-06 | 2013-04-17 | 国家海洋局天津海水淡化与综合利用研究所 | Preparation method of multi-effect seawater flocculating agent |
| CN104016454A (en) * | 2013-09-27 | 2014-09-03 | 四川景星环境科技有限公司 | Flocculation precipitant for secondary lead wastewater treatment and preparation method thereof |
| CN104016454B (en) * | 2013-09-27 | 2016-04-06 | 四川景星环境科技有限公司 | A kind of preparation method of the flocculating settling agent for secondary lead wastewater treatment |
| CN104310558A (en) * | 2014-09-25 | 2015-01-28 | 青岛佰众化工技术有限公司 | Industrial wastewater flocculating agent |
| CN105712450A (en) * | 2016-03-08 | 2016-06-29 | 佛山市聚成生化技术研发有限公司 | Preparation method of chitosan composite flocculant and chitosan composite flocculant prepared through same |
| CN110921843A (en) * | 2019-12-12 | 2020-03-27 | 佛山科学技术学院 | Preparation method of polymer composite flocculant for printing and dyeing sewage |
| CN110921843B (en) * | 2019-12-12 | 2022-04-15 | 佛山科学技术学院 | Preparation method of polymer composite flocculant for printing and dyeing sewage |
| CN112279347A (en) * | 2020-09-08 | 2021-01-29 | 广州户户通科技发展有限公司 | Efficient domestic sewage treatment agent and preparation method and application thereof |
| WO2022205535A1 (en) * | 2021-03-31 | 2022-10-06 | 广西桂柳化工有限责任公司 | Method for preparing electrolytic manganese dioxide for producing lithium manganate material |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101838040A (en) | Method for purifying seawater by taking carboxymethyl chitosan as flocculant | |
| CN101880356B (en) | Preparation method of grafting amphoteric chitosan flocculant | |
| CN103253752B (en) | High-efficiency flocculant | |
| CN1654348A (en) | Composite flocculating agent for printing and dyeing waste water treatment | |
| CN102432091A (en) | Preparation method of composite flocculating agent for pretreating blue alga biogas slurry | |
| CN105000680A (en) | Novel compound water treatment agent | |
| CN101838039A (en) | Method for purifying seawater by taking vanillin modified chitosan as flocculant | |
| CN105016494A (en) | Composite water treatment agent | |
| CN103359815B (en) | Novel high-efficiency environment-friendly coagulating agent used for treating turbid water or polluted water | |
| CN103232101B (en) | Water treatment flocculating agent | |
| CN103420468A (en) | Multi-element composite flocculant for treating printing and dying wastewater and textile wastewater and preparing method thereof | |
| CN101531413A (en) | Novel compositing and flocculating method for environment-friendly compound flocculating agent | |
| CN112978879A (en) | Double-compound magnetic modified flocculant for separating suspended particles in high-turbidity water and preparation and application thereof | |
| CN104016454A (en) | Flocculation precipitant for secondary lead wastewater treatment and preparation method thereof | |
| CN102531128A (en) | Ferric salt-sodium alga acid combination anterior filming water treatment agent, production and application thereof | |
| CN104150741A (en) | Sludge chemical conditioning method and conditioner | |
| CN105060510A (en) | Phosphor-free water treating agent | |
| CN101125699A (en) | Method for preparing ecological safety type composite flocculant | |
| CN105060513A (en) | Green water treatment agent | |
| CN100390076C (en) | Preparation method of chitin-alginic acid copolymer flocculant | |
| CN109775779A (en) | A kind of Water Treatment agent | |
| CN105000685B (en) | Chemical water treatment agent | |
| CN104229966A (en) | Magnetic collagen starch modified cationic flocculant and preparation method thereof | |
| CN103524640A (en) | Preparation method of water soluble N-carboxyethyl chitosan | |
| CN110040834A (en) | A kind of all natural composite flocculation agent and its application of asepsis environment-protecting |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20100922 |