CN1648062A - Chitin/chitosan water processing flocculating agent and its preparing method - Google Patents
Chitin/chitosan water processing flocculating agent and its preparing method Download PDFInfo
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- CN1648062A CN1648062A CNA2004100735771A CN200410073577A CN1648062A CN 1648062 A CN1648062 A CN 1648062A CN A2004100735771 A CNA2004100735771 A CN A2004100735771A CN 200410073577 A CN200410073577 A CN 200410073577A CN 1648062 A CN1648062 A CN 1648062A
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Abstract
The present invention relates to water treating chitin/chitosan flocculating agent and its preparation process. The preparation process includes mixing water with chitin/chitosan to result in solution concentration of 0.25-5 % and reaction at 20-25 deg.c through stirring for 0.5-5 hr; adding organic acid in concentration controlled in 1-10 wt% and reaction for 0.5-4 hr. The added chitin/chitosan includes chitosan in 70-80 wt% or is chitosan alone. The flocculating agent has no toxicity, no smell, high safety and no secondary pollution; high flocculating effect with large flocculated grains and fast deposition; low added amount and thus low water treating cost. The flocculating agent is easy to prepare and easy to use, and water works may use the flocculating agent in available apparatus.
Description
Technical field
The present invention relates to chitin/chitosan water treatment flocculant and preparation method thereof, belong to water treatment flocculation technique field.
Background technology
The former water of the tap water of waterworks use at present, majority is taken from surface water, river, lake water, owing to be subjected to the influence of industrial wastewater discharge and other factors, often contains heavy metal ion in the former water, as As
5+, Pb
2+, Cu
2+, Zn
2+, Fe
2+, Fe
3+, Ni
2+, Cr
3+, Cr
6+Deng, when these ions exceed standard, directly influence the healthy of people.
In waste water or former water, add flocculation agent, colloid in the water body, suspended solids and dissolved organic matter are passed through physics chemical action, thereby remove turbidity, COD (chemical oxygen demand (COD)), colourity, suspended solids and other material in water and the waste water, the water quality of waste water or former water is purified.The flocculation agent that uses mainly contains inorganic flocculating agent and organic polymer coargulator two big classes at present.What the use at present of organic water treatment flocculant was more is PAM (polyacrylamide), be to generate with the polymerization of industrial chemicals propylamine acid amides, the main drawback of present homemade polyacrylamide has molecular weight product lower, and remaining a large amount of poisonous acrylamide monomers can not be used for to water treatment.Simultaneously PAM is a kind of carcinogenic substance, works the mischief for people's health under permanent.Inorganic water treatment flocculant uses at present PAC (containing aluminium, iron series flocculants) comparatively widely, and it is big that shortcoming mainly contains usage quantity, and its consumption is more than ten times of organic water treatment flocculant normally; The flco amount is big, and sedimentation speed is slow, dehydration difficulty, ultimate disposal cost height; And medical circle studies show that in recent years, and long-term drinking contains the high water of aluminium and easily causes following disease: senile dementia, and hypomnesis makes sclerotin become loose softening, the renal function imbalance, renal failure and uremia make blood and cardiovascular generation disease; Somatocyte and sexual cell there is mutagenic effect.American-European many developed countries have formulated the restriction index of aluminium in the tap water.In " drinking water sanitary standard " that China Ministry of Health is about to issue, also aluminium is classified as one of drinking-water quality controlling index, and clearly in the regulation tap water aluminium content must not be higher than 0.2mg/l.
Chitin/chitosan is from natural shrimp shell, extract in the crab shell or be that raw material makes by biological engineering method with grain, thereby it is nontoxic, tasteless, safety, it is a kind of organic polymer coargulator of environmental protection, because it contains hydroxyl, carboxyl, amino and other active groups, thereby the solid particulate in the adsorbable water, organism and heavy metal etc., reach the purpose of purified tap water, turbidity is reduced in national drinking water standard 3 degree, same because its adsorption, chitin/chitosan can also Adsorption of Heavy Metal Ions and haloalkane, can reduce the sickness rate of cancer and hepatopathy.Chinese patent 00109435.1 has proposed a kind of preparation method of chitosan water processing flocculating agent; make shrimp and crab shells slough inorganic salt; carry out solid-liquid separation; oven dry obtains taking off the inorganic salt product, makes the shrimp and crab shells deproteinize, and reaction system is carried out solid-liquid separation; oven dry obtains the chitin product; deacetylate carries out solid-liquid separation with reaction system, and the solid particulate that oven dry obtains is the chitosan water processing flocculating agent product.Many weeks, chitosan has relatively poor solvability in water, therefore, use chitosan as flocculation agent poor effect, large usage quantity merely.
Summary of the invention
One of purpose of the present invention provides a kind of chitin/chitosan water treatment flocculant, and it is poorly soluble to overcome existing chitosan flocculant product, the water treatment poor effect, and the deficiency that the flocculation agent usage quantity is big reduces cost of water treatment.
Another object of the present invention provides the preparation method of above-mentioned chitin/chitosan water treatment flocculant.
Technical scheme of the present invention is as follows:
The chitin/chitosan water treatment flocculant, it is composed as follows for percentage composition by weight:
Chitin/chitosan 0.25-5%
The organic acid 1-10% of dissolving chitin/chitosan
Water 85-98.75%
Described organic acid is one of formic acid, acetate, citric acid, phenylformic acid, chlorsulfonic acid, Whitfield's ointment or its mixing acid, if use citric acid and organic acid mixing acid such as formic acid, acetate, phenylformic acid, chlorsulfonic acid or Whitfield's ointment, the water treatment flocculant flocculating effect that obtains is better, and this is because citric acid has more H
+, can be good at dissolving chitin and chitosan, its add-on accounts for the 5-15% of organic acid total amount, if add too much, influences flocculating effect.
Consider the market value factor (ten thousand yuan of chitin 3-4 per ton, ten thousand yuan of chitosan 8-9 per ton) of present chitin and chitosan, it is wise selecting for use chitin to add chitosan.In the chitin/chitosan total amount that adds, chitosan accounts for 70-80% in chitin/chitosan, also can use chitosan separately certainly, chitin deacetylase degree 45%-55% wherein, and deacetylating degree of chitosan is 56%-96%.
Described water can use the drinking public water supply that enters pipe network system after purifying.The flocculation agent pH value that finally makes is at 2-4, and proportion is between 1.01-1.05.
The production process of chitin/chitosan water treatment flocculant is as follows: at first water is mixed by calculated amount with chitin/chitosan, make final chitin/chitosan strength of solution between 0.25%-5%, temperature of reaction is controlled at 20-50 ℃ and stirred 0.5-5 hour, add the calculated amount organic acid then, make its concentration be controlled at 1%-10%, reacted 0.5-4 hour.In the total amount that adds chitin/chitosan, chitosan accounts for 70-80% or uses chitosan separately.
Described organic acid is one of formic acid, acetate, citric acid, phenylformic acid, chlorsulfonic acid, Whitfield's ointment or its mixing acid, if use citric acid and organic acid mixing acid, the water treatment flocculant flocculating effect that obtains is better, and citric acid adding amount accounts for the 5-15% of organic acid total amount.
In adding the total amount of chitin/chitosan, chitosan accounts for 70-80% or uses chitosan separately in chitin/chitosan, chitin deacetylase degree 45%-55% wherein, and deacetylating degree of chitosan is 56%-96%.
Advantage of the present invention is as follows:
1, this flocculation agent is nontoxic, tasteless, and is safe, non-secondary pollution.
2, because this flocculation agent that obtains is a solution, and flocculating effect is remarkable, the flocculation particle is big, and sedimentation is fast, and flocculant addition is few, and turbidity is in primary treatment between the 10-70 degree can be up to state standards 3 degree in the former water.
3, adsorbable heavy metal ion of this flocculation agent and haloalkane.
4, adopt PAC and PAM makes flocculation agent and chitin/chitosan is done economic balance as flocculation agent, the result that compares shows that the employing chitin/chitosan is than the former every processing 1m
3The expense of water can reduce about 10%, and its major cause is because used chitin/chitosan to make raw material, simultaneously because flocculating effect of the present invention is obvious, when treating water, only need add a small amount of (1-4mg/L).
5, it is simple, easy to use to prepare the technology of this flocculation agent, can utilize existing equipment to the waterworks, need not increase new installation.
Embodiment
The present invention will be further described below in conjunction with embodiment.
Embodiment 1
At first, add in the reactor, do not stopping under the condition of stirring, add chitin 0.2g tap water 96ml, chitosan 0.8g stirred 1 hour at 30 ℃, slowly added 98% acetate 2.5g, stir 0.5h, make the chitin/chitosan dissolving, get final product the acetic acid solution of about 1% chitin/chitosan.
The pH value of sampling Detection solution is at 2-4, proportion between 1.01-1.03, the viscosity of solution (25 ℃ mpas) are 4.5-5.5.
Flocculating experiment: get Heihe, Xian City, Shanxi Province Yuan Shui 1m
3, record its turbidity 60 degree, add above-mentioned chitin/chitosan solution 250ml, mix, sedimentation its turbidity after 8 hours＜3 degree, its heavy metal ion and haloalkane all reach national GB5749-85 standard.
Embodiment 2
With tap water 200ml, add in the reactor, constantly adding chitosan 3.4g under the condition of stirring, stirred 1 hour at 43 ℃, add citric acid 0.5g then, 85% formic acid 4ml, stir 1h, chitosan is dissolved fully, can get formic acid, the citric acid solution of as clear as crystal about 1.6% chitosan.
The pH value of sampling Detection solution is at 3-5, proportion between 1.02-1.04, the viscosity of solution (25 ℃ mpas) are 4.0-4.5.
Flocculating experiment: get river 1m
3, record its turbidity 70 degree, add above-mentioned flocculate with chitosan agent solution 200ml, mix, sedimentation recorded turbidity＜3 degree after 6 hours, and its heavy metal ion and haloalkane all reach national GB5749-85 standard.
Claims (10)
1, chitin/chitosan water treatment flocculant, it is composed as follows for percentage composition by weight:
Chitin/chitosan 0.25-5%
The organic acid 1-10% of dissolving chitin/chitosan
Water 85-98.75%
2, chitin/chitosan water treatment flocculant according to claim 1 is characterized in that: described organic acid is one of formic acid, acetate, citric acid, phenylformic acid, chlorsulfonic acid, Whitfield's ointment or its mixing acid.
3, chitin/chitosan water treatment flocculant according to claim 1 and 2, it is characterized in that: chitosan accounts for 70-80% in chitin/chitosan, chitin deacetylase degree 45%-55% wherein, deacetylating degree of chitosan is 56%-96%.
4, chitin/chitosan water treatment flocculant according to claim 1 and 2 is characterized in that: chitin/chitosan is a chitosan.
5, chitin/chitosan water treatment flocculant according to claim 1 is characterized in that: the pH value of flocculant solution is at 2-4, and proportion is between 1.01-1.05.
6, chitin/chitosan water treatment flocculant according to claim 2, it is characterized in that: citric acid accounts for the 5-15% of mixing acid total amount.
7, the preparation method of the described chitin/chitosan of claim 1, its production process is: at first water is mixed by calculated amount with chitin/chitosan, make final chitin/chitosan strength of solution between 0.25%-5%, temperature of reaction is controlled at 20-50 ℃ and stirred 0.5-5 hour, add the calculated amount organic acid then, make its concentration be controlled at 1%-10%, reacted 0.5-4 hour.
8, the preparation method of chitin/chitosan water treatment flocculant according to claim 7 is characterized in that: chitosan accounts for 70-80% in chitin/chitosan, chitin deacetylase degree 45%-55% wherein, and deacetylating degree of chitosan is 56%-96%.
9, according to the preparation method of claim 7 or 8 described chitin/chitosan water treatment flocculants, it is characterized in that: described organic acid is one of formic acid, acetate, citric acid, phenylformic acid, chlorsulfonic acid, Whitfield's ointment or its mixing acid.
10, the preparation method of chitin/chitosan water treatment flocculant according to claim 9 is characterized in that: citric acid accounts for the 5-15% of mixing acid total amount.
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100532287C (en) * | 2006-08-25 | 2009-08-26 | 中国科学院沈阳应用生态研究所 | Natural compound flocculant of chitosan, producing method and uses of the same |
| CN101148281B (en) * | 2006-09-22 | 2010-09-15 | 财团法人生物技术开发中心 | Biological flocculant and method for treating high-turbidity water |
| CN102260006A (en) * | 2011-07-04 | 2011-11-30 | 昆明理工大学 | Method for treating heavy-metal-containing wastewater membrane filtration concentrated liquid |
| CN102285735A (en) * | 2011-06-10 | 2011-12-21 | 上海膜达克环保工程有限公司 | Ultrafiltration membrane treatment system and treatment process of heavy metal wastewater |
| CN102295336A (en) * | 2011-08-23 | 2011-12-28 | 杭州江南科学研究院有限公司 | Flocculating purifying agent for tap water |
| CN102381747A (en) * | 2010-09-06 | 2012-03-21 | 中国中化股份有限公司 | Clarifying agent as well as preparation method and application thereof |
| CN102642903A (en) * | 2011-02-21 | 2012-08-22 | 上海丰信环保科技有限公司 | Preparation method of novel modified montmorillonite-chitosan composite flocculating agent |
| CN102764632A (en) * | 2012-07-05 | 2012-11-07 | 昆明豪原特自控有限公司 | Biological heavy metal adsorbing and flocculating agent and preparation method thereof |
| CN102887581A (en) * | 2012-10-19 | 2013-01-23 | 江苏商达水务有限公司 | Flocculating agent for treating sewage in Chinese patent medicine production enterprises and preparation method thereof |
| CN103708568A (en) * | 2013-12-11 | 2014-04-09 | 山东华亚环保科技有限公司 | Papermaking sewage treatment agent |
| CN106277254A (en) * | 2016-09-08 | 2017-01-04 | 合肥智慧殿投资管理有限公司 | One way of life sewage coagulant and its production and use |
| CN107585844A (en) * | 2017-09-30 | 2018-01-16 | 铜陵家宴生态农业发展有限公司 | A kind of preparation method of lactic modified banana tegument extract composite starch coagulant |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103340410A (en) * | 2013-06-19 | 2013-10-09 | 太仓市荣德生物技术研究所 | Water soluble chitin |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1021704C (en) * | 1990-04-13 | 1993-07-28 | 陈雪贞 | Process for extracting amino glutaric acid |
| JPH1157314A (en) * | 1997-08-26 | 1999-03-02 | Chikanosuke Oki | Flocculant |
| CN1119294C (en) * | 2000-06-23 | 2003-08-27 | 清华大学 | Method for preparing flocculent for treatment of chitosan water |
-
2004
- 2004-12-31 CN CNB2004100735771A patent/CN100343180C/en not_active Expired - Fee Related
Cited By (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100532287C (en) * | 2006-08-25 | 2009-08-26 | 中国科学院沈阳应用生态研究所 | Natural compound flocculant of chitosan, producing method and uses of the same |
| CN101148281B (en) * | 2006-09-22 | 2010-09-15 | 财团法人生物技术开发中心 | Biological flocculant and method for treating high-turbidity water |
| CN102381747A (en) * | 2010-09-06 | 2012-03-21 | 中国中化股份有限公司 | Clarifying agent as well as preparation method and application thereof |
| CN102381747B (en) * | 2010-09-06 | 2013-10-16 | 中国中化股份有限公司 | Clarifying agent as well as preparation method and application thereof |
| CN102642903A (en) * | 2011-02-21 | 2012-08-22 | 上海丰信环保科技有限公司 | Preparation method of novel modified montmorillonite-chitosan composite flocculating agent |
| CN102285735A (en) * | 2011-06-10 | 2011-12-21 | 上海膜达克环保工程有限公司 | Ultrafiltration membrane treatment system and treatment process of heavy metal wastewater |
| CN102260006B (en) * | 2011-07-04 | 2013-01-16 | 昆明理工大学 | Method for treating heavy-metal-containing wastewater membrane filtration concentrated liquid |
| CN102260006A (en) * | 2011-07-04 | 2011-11-30 | 昆明理工大学 | Method for treating heavy-metal-containing wastewater membrane filtration concentrated liquid |
| CN102295336A (en) * | 2011-08-23 | 2011-12-28 | 杭州江南科学研究院有限公司 | Flocculating purifying agent for tap water |
| CN102764632A (en) * | 2012-07-05 | 2012-11-07 | 昆明豪原特自控有限公司 | Biological heavy metal adsorbing and flocculating agent and preparation method thereof |
| CN102887581A (en) * | 2012-10-19 | 2013-01-23 | 江苏商达水务有限公司 | Flocculating agent for treating sewage in Chinese patent medicine production enterprises and preparation method thereof |
| CN102887581B (en) * | 2012-10-19 | 2014-10-22 | 江苏商达水务有限公司 | Flocculating agent for treating sewage in Chinese patent medicine production enterprises and preparation method thereof |
| CN103708568A (en) * | 2013-12-11 | 2014-04-09 | 山东华亚环保科技有限公司 | Papermaking sewage treatment agent |
| CN103708568B (en) * | 2013-12-11 | 2015-10-14 | 顾祥茂 | A kind for the treatment of agent for papermaking wastewater |
| CN106277254A (en) * | 2016-09-08 | 2017-01-04 | 合肥智慧殿投资管理有限公司 | One way of life sewage coagulant and its production and use |
| CN107585844A (en) * | 2017-09-30 | 2018-01-16 | 铜陵家宴生态农业发展有限公司 | A kind of preparation method of lactic modified banana tegument extract composite starch coagulant |
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| CN100343180C (en) | 2007-10-17 |
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