CN105692850B - A kind of preparation method of water process banana skin high-molecular coagulant adopting - Google Patents
A kind of preparation method of water process banana skin high-molecular coagulant adopting Download PDFInfo
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
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Abstract
The invention belongs to water-treatment technology field, relate to a kind of technology of preparing of water process banana skin high-molecular coagulant adopting, and main " the low temperature water extraction " for using 30 DEG C ~ 50 DEG C, includes the following steps：（1）Under certain temperature and stirring condition, a certain amount of water is added in the banana skin powder after crushing, leaching；（2）Under certain temperature and stirring condition, a small amount of sodium hydroxide solution is added；（3）A certain amount of sodium hypochlorite and stabilizer are optionally added, to obtain the coagulant product with different-effect and stability.The technology of the present invention can prepare a kind of banana skin utilization rate is higher, manufacturing cost is relatively low, water outlet pH value in the range of neutral or alkalescent, stability preferably, more excellent, especially higher to colourity, the removal efficiency of heavy metals water process banana skin high-molecular coagulant adopting of water treatment efficiency.Water process in the present invention can be widely applied to the fields such as drinking water, municipal sewage, industrial wastewater with banana skin high-molecular coagulant adopting.
Description
Technical field
The invention belongs to water-treatment technology field, is related to a kind of water process banana skin macromolecule using banana skin as raw material
The technology of preparing of coagulant.
Background technology
Coagulation process is to belong to the physico of water using one of most common unit operation in numerous water treatment technologies
Learn processing method.Pass through the dosing coagulant into water and waste water（Or it is water purification agent, flocculant）, make colloidal substance therein or
The less suspended matter for being difficult to precipitate occurs cohesion and flocculation and precipitates and separate, and makes drinking water and all kinds of dirts（It is useless）Water obtains
Purification.In drinking water treatment, coagulation is as essential pre action process in earth's surface water purification process, you can reduces former
The related physical and chemical index such as the turbidity of water, colourity, also can remove multiple harmful substances and microorganism in water, at the same also assign colloid or
The performance that suspended particulate is stopped in subsequent filter operation.The quality of coagulation effect, largely decides rear afterflow
Operating condition, final outflow water water quality and the water process expense of journey.In waste water two level or tertiary treatment, coagulation process often with its
Its treatment process is applied in combination, to mitigate biochemical treatment load or remove residual organic matter, inorganic matter and microorganism.It is in addition, mixed
Solidifying process is also used for the thickening of sludge.Therefore coagulation process is scientific research and development neck important in water treatment procedure all the time
Domain, and coagulant is the core technology of coagulation process.Coagulant is divided into inorganic coagulant, organic coagulants, microorganism coagulant
Three major types, are respectively provided with various kind in each major class, there is low molecule, a macromolecule, single type, compound, but generally at a low price,
Efficiently, nontoxic direction is developed.Inorganic coagulant price is relatively low, and stability is preferable, and tool has great advantage, but to biology and environment
There is a degree of negative effect.Artificial synthesized organic polymer coagulant has the characteristics that efficient, dosage is few, but remains
Thing will also result in very big harm to biology and environment.Microorganism coagulant is substantially nontoxic, but from its preparation, storage to using equal
With unstability, therefore conceptual phase is also substantially at present, is promoted apart from its scale and need remain for longer period of time
Explore.
It is natural high molecular substance aboundresources, cheap, degradable, nontoxic, there is good environmental acceptance, and be directed to
The smaller or nontoxic raw water of toxicity, the sludge that water process produces afterwards completely can be with farmland reuse, therefore has obtained generation in recent years
The extensive concern of various countries of boundary water treatment field expert.And apply the scope in water treatment field to expand day by day agriculture and forestry organic waste material,
Such as husk, rice straw, straw, cornstalk, peanut shell, bagasse, fruit peel etc..Banana belongs to the main water of Perenniporia martius
Fruit, in China south China, yield is very big, there is the title of " four big fruit ".It is fragrant in recent years due to the structural adjustment of agricultural industrialization
Any of several broadleaf plants yield is significantly increased, and China's banana total output reaches 11,790,000 tons within 2014.And the weight of banana skin can account for its fruit weight
40% or so, yield is huge, cheap, in addition also significant component of banana skin as discarded object abandon in the environment,
If do not dealt carefully with, a degree of negative effect can be caused to environment.At present on banana skin deep processing and deep exploitation
Research relate generally to glucide（Pectin, dietary fiber, polysaccharide etc.）, aldehydes matter（Polyphenol, flavones, tannin etc.）And its
His functional components（Melanin, aliphatic acid etc.）Research, and only exist in the laboratory research stage.On banana skin in Shui Chu
The application in reason field mainly includes adsorptivity and directly utilizes two broad aspects.There are some both at home and abroad on banana skin adsorptivity at present
The patent utilized, such as：A kind of banana skin modified activated carbon diatomite particle for desulfurization and dedusting and preparation method thereof
（CN201510191618.5）, a kind of preparation of pyromellitic acid anhydride modification banana skin adsorbent（CN100406396C）, profit
The method of ammonia nitrogen adsorbent and the application of ammonia nitrogen adsorbent are prepared with banana skin（CN201310168967.6）, a kind of banana leather
Into dye sorbent（CN201210121603.8）.Wherein CN 100406396C provide a kind of using banana skin to be main former
Material, the pyromellitic dianhydride using pyromellitic dianhydride as modifying agent are modified the preparation method of banana skin adsorbent；
CN201310168967.6 provides one kind only by dehydration-broken-immersion-washing, utilizes banana skin to prepare ammonia nitrogen absorption
The method of agent；CN201210121603.8 provides a kind of method that banana skin is prepared to dye sorbent using fermentation method.Mesh
It is preceding also to there are some directly to utilize the patent of banana skin on water treatment procedure both at home and abroad, such as：Handled using banana skin and given up containing chromium
The method of water（CN201210009635.9）, using banana skin cook liquid remove water body in Microcystis aeruginosa method
（CN201110442551.X）.It is above-mentioned to be not directed to using banana skin as raw material on application technology of the banana skin in water treatment field
Water process coagulant preparation.At present in domestic and foreign literature database, also have no using banana skin as raw material, with simple
" low temperature water extraction " prepares the relevant report of water process banana skin coagulant.
The content of the invention
Present invention is primarily intended to open up a kind of new thinking for comprehensive utilization banana skin, technical problems to be solved are to carry
For a kind of technology of preparing of water process banana skin high-molecular coagulant adopting, by using containing carbohydrate, tannin, pectin, calcium and magnesium
Banana skin Deng inorganic salts prepares the banana skin high-molecular coagulant adopting that water process efficiency is more excellent, accommodation is wider.
In order to achieve the above object, the technical solution adopted by the present invention is as follows：
Water process is with the component and content of banana skin high-molecular coagulant adopting：
Banana skin 1.5% ~ 15%
Water 79% ~ 98%
Mass fraction is 15% ~ 45% sodium hydroxide solution 0.08% ~ 3.5%
Mass fraction is 10% ~ 13% liquor natrii hypochloritis 0% ~ 3.5%
Stabilizer 0% ~ 0.015%, all percentages are attached most importance to
Measure percentage；
Sodium hydroxide used is technical grade product；
Sodium hypochlorite used is technical grade product；
Stabilizer used is the Kathon CG solution that the mass fraction of active principle is 14% ~ 15%, technical grade product；
Water process of the present invention is made with the technology of preparing of banana skin high-molecular coagulant adopting as " water at low temperature carries in above-mentioned each component
Method ", concrete scheme are as follows：
（1）Banana skin is dried, and is ground into powdered；
（2）Under 150 revs/min ~ 300 revs/min of mixing speed, 30 DEG C ~ 50 DEG C of 79% ~ 98% water is added to
In 1.5% ~ 15% powdered banana skin, stir 1 minute ~ 5 minutes, then when continuous heating 1 is small at a temperature of 30 DEG C ~ 50 DEG C
~ 4 it is small when, obtain extraction mixed liquor, it is spare；
（3）Under conditions of 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 30 DEG C ~ 50 DEG C, by 0.08%
The sodium hydroxide solution that ~ 3.5% mass fraction is 15% ~ 45% is added in said extracted mixed liquor, stirs 10 minutes ~ 25 points
Clock, obtains the poly- liquid of alkali, spare；
（4）Under conditions of 150 revs/min ~ 350 revs/min of mixing speeds and temperature are 30 DEG C ~ 50 DEG C, by 0% ~
The liquor natrii hypochloritis that 3.5% mass fraction is 10% ~ 13% is added in the poly- liquid of above-mentioned alkali, is stirred 3 minutes ~ 10 minutes, is obtained
The poly- distiller liquor of alkali, then 150 revs/min ~ 350 revs/min mixing speed and temperature be 30 DEG C ~ 50 DEG C under conditions of, will
The Kathon CG solution that the mass fraction of 0% ~ 0.015% active principle is 14% ~ 15% is added in the poly- distiller liquor of above-mentioned alkali, stirring 3
Minute ~ 10 minutes, stop stirring, stand curing at room temperature, control the curing time for 0.5 it is small when ~ 24 it is small when, obtained dark brown or
Yellowish-brown water process banana skin high-molecular coagulant adopting fluid product；
（5）Using reverse contact spray drying process or naturally dry method or freezing by aforesaid liquid product solidification,
In reverse contact spray drying process, hot air flowrate 300m3/h~550m3/ h, hot-air inlets temperature are 100 DEG C ~ 105 DEG C,
In naturally dry method, by above-mentioned water process banana skin high-molecular coagulant adopting fluid product naturally dry, crush, in freezing
In, cryogenic temperature control is -40 DEG C ~ -10 DEG C, and drabon color or khaki powdered solid product is made.
The invention has the advantages that：
1st, the present invention is using banana skin and water as primary raw material, using industrial sodium hydroxide and technical grade sodium hypochlorite as auxiliary
The addition of raw material, wherein sodium hydroxide is relatively low, reduces manufacturing cost.
2nd, water process of the invention uses " low temperature water extraction " with the technology of preparing of banana skin high-molecular coagulant adopting, and passes through
Add a small amount of further alkali carries alkali of sodium hydroxide progress and gather reaction, production process is normal pressure, and temperature of reaction kettle requirement is 30
DEG C ~ 50 DEG C, energy consumption is low, production process non-secondary pollution, and production equipment and technical process are simple, economic, practical, realizes very well.
3rd, water process of the invention is relatively low with the addition of sodium hydroxide in banana skin high-molecular coagulant adopting, the pH value of water outlet
In the range of neutral or alkalescent, it is not necessary to which additional acid reduces cost of water treatment to reduce the pH value of water outlet.
4th, the sodium hypochlorite added in the present invention, which has water process banana skin high-molecular coagulant adopting, extends storage time
And improve the double action of depollution effect.
5th, the Kathon CG added in the present invention has antisepsis to water process banana skin high-molecular coagulant adopting, preferably prolongs
Storage time is grown.
6th, water process of the invention can be applied to drinking water, municipal sewage, industrial wastewater with banana skin high-molecular coagulant adopting
Deng field.
Embodiment
The present invention is described in further detail with reference to embodiment.
Embodiment 1
Banana skin is dried, and is ground into powdered.Under 150 revs/min ~ 300 revs/min of mixing speed, by 30
DEG C the water of 95L be added in the powdered banana skin of 2Kg, stir 1 minute, then continuous heating 2 is small at a temperature of 30 DEG C
When, extraction mixed liquor is obtained, it is spare.Under conditions of 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 30 DEG C,
The sodium hydroxide solution that the mass fraction of 0.1L is 20% is added in said extracted mixed liquor, is stirred 10 minutes, is obtained alkali and gather
Liquid, stops stirring, stands curing at room temperature, control the curing time for 0.5 it is small when, obtained dark brown water process banana skin high score
Sub- coagulant fluid product.
Embodiment 2
Banana skin is dried, and is ground into powdered.Under 150 revs/min ~ 300 revs/min of mixing speed, by 50
DEG C the water of 300L be added in the powdered banana skin of 40Kg, stir 3 minutes, then the continuous heating 4 at a temperature of 50 DEG C
Hour, extraction mixed liquor is obtained, it is spare.In the condition that 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 50 DEG C
Under, the sodium hydroxide solution that the mass fraction of 4L is 30% is added in said extracted mixed liquor, stirs 15 minutes, obtains alkali
Poly- liquid, it is spare.Under conditions of 150 revs/min ~ 350 revs/min of mixing speeds and temperature are 50 DEG C, by the quality of 3L point
Number is added in the poly- liquid of above-mentioned alkali for 10% liquor natrii hypochloritis, is stirred 3 minutes, obtains the poly- distiller liquor of alkali, stops stirring, room
Temperature is lower to stand curing, control the curing time for 24 it is small when, the banana skin high-molecular coagulant adopting liquid production of yellowish-brown water process is made
Product.
Embodiment 3
Banana skin is dried, and is ground into powdered.Under 150 revs/min ~ 300 revs/min of mixing speed, by 50
DEG C the water of 210L be added in the powdered banana skin of 20Kg, stir 5 minutes, then the continuous heating at a temperature of 50 DEG C
3.5 it is small when, obtain extraction mixed liquor, it is spare.In the bar that 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 50 DEG C
Under part, the sodium hydroxide solution that the mass fraction of 4L is 40% is added in said extracted mixed liquor, stirs 25 minutes, obtains
The poly- liquid of alkali, it is spare.Under conditions of 150 revs/min ~ 350 revs/min of mixing speeds and temperature are 50 DEG C, by the quality of 5L
The liquor natrii hypochloritis that fraction is 10% is added in the poly- liquid of above-mentioned alkali, is stirred 10 minutes, the poly- distiller liquor of alkali is obtained, then 150
Rev/min ~ under conditions of 350 revs/min of mixing speed and temperature be 50 DEG C, by the mass fraction of the active principle of 0.01L
It is added in the poly- distiller liquor of above-mentioned alkali, stirs 3 minutes for 14% Kathon CG solution, stop stirring, stands curing, control at room temperature
When curing time is 24 small, yellowish-brown water process banana skin high-molecular coagulant adopting fluid product is made.
Embodiment 4
Banana skin is dried, and is ground into powdered.Under 150 revs/min ~ 300 revs/min of mixing speed, by 30
DEG C the water of 95L be added in the powdered banana skin of 2Kg, stir 1 minute, then continuous heating 2 is small at a temperature of 30 DEG C
When, extraction mixed liquor is obtained, it is spare.Under conditions of 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 30 DEG C,
The sodium hydroxide solution that the mass fraction of 0.1L is 20% is added in said extracted mixed liquor, is stirred 10 minutes, is obtained alkali and gather
Liquid, stops stirring, stands curing at room temperature, control the curing time for 0.5 it is small when, obtained dark brown water process banana skin high score
Sub- coagulant fluid product.It is by aforesaid liquid product solidification, hot air flowrate using reverse contact spray drying process
450m3/ h, hot-air inlets temperature are 100 DEG C ~ 105 DEG C, and drab powdered solid product is made.
Embodiment 5
Banana skin is dried, and is ground into powdered.Under 150 revs/min ~ 300 revs/min of mixing speed, by 50
DEG C the water of 300L be added in the powdered banana skin of 40Kg, stir 3 minutes, then the continuous heating 4 at a temperature of 50 DEG C
Hour, extraction mixed liquor is obtained, it is spare.In the condition that 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 50 DEG C
Under, the sodium hydroxide solution that the mass fraction of 4L is 30% is added in said extracted mixed liquor, stirs 15 minutes, obtains alkali
Poly- liquid, it is spare.Under conditions of 150 revs/min ~ 350 revs/min of mixing speeds and temperature are 50 DEG C, by the quality of 3L point
Number is added in the poly- liquid of above-mentioned alkali for 10% liquor natrii hypochloritis, is stirred 3 minutes, obtains the poly- distiller liquor of alkali, stops stirring, room
Temperature is lower to stand curing, control the curing time for 24 it is small when, the banana skin high-molecular coagulant adopting liquid production of yellowish-brown water process is made
Product.Using naturally dry method by aforesaid liquid product solidification, above-mentioned water process banana skin high-molecular coagulant adopting liquid is produced
Product naturally dry, crush, and khaki powdered solid product is made.
Embodiment 6
Banana skin is dried, and is ground into powdered.Under 150 revs/min ~ 300 revs/min of mixing speed, by 50
DEG C the water of 210L be added in the powdered banana skin of 20Kg, stir 5 minutes, then the continuous heating at a temperature of 50 DEG C
3.5 it is small when, obtain extraction mixed liquor, it is spare.In the bar that 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 50 DEG C
Under part, the sodium hydroxide solution that the mass fraction of 4L is 40% is added in said extracted mixed liquor, stirs 25 minutes, obtains
The poly- liquid of alkali, it is spare.Under conditions of 150 revs/min ~ 350 revs/min of mixing speeds and temperature are 50 DEG C, by the quality of 5L
The liquor natrii hypochloritis that fraction is 10% is added in the poly- liquid of above-mentioned alkali, is stirred 10 minutes, the poly- distiller liquor of alkali is obtained, then 150
Rev/min ~ under conditions of 350 revs/min of mixing speed and temperature be 50 DEG C, by the mass fraction of the active principle of 0.01L
It is added in the poly- distiller liquor of above-mentioned alkali, stirs 3 minutes for 14% Kathon CG solution, stop stirring, stands curing, control at room temperature
When curing time is 24 small, yellowish-brown water process banana skin high-molecular coagulant adopting fluid product is made.Will be upper using freezing
Fluid product solidification is stated, cryogenic temperature control is -30 DEG C, and khaki powdered solid product is made.
Application example 1
The water process of No.1,2,3 banana skin high-molecular coagulant adopting product and polymerization prepared by above example 1,2,3
Ferro-aluminum（PAF）The coagulating treatment for the simulated water sample prepared for kaolin and humic acid.Raw water turbidity is 83 ~ 118 NTU, pH value
For 8.71 ~ 8.77, colourity is 0.376 ~ 0.481 CU, and water temperature is 15 DEG C.Handling result is listed in table 1, table 2.
The contrast of banana skin high-molecular coagulant adopting and PAF coagulation effects of 1 water process of table, dosage is 1 mL
The contrast of banana skin high-molecular coagulant adopting and PAF coagulation effects of 2 water process of table, dosage is 2 mL
From above handling result as it can be seen that and polymeric ferric aluminum（PAF）Compare, water process banana skin high-molecular coagulant adopting has
More excellent turbidity removal, except color performance.
Application example 2
The water process of No.1,2,3 banana skin high-molecular coagulant adopting product and polymerization prepared by above example 1,2,3
Ferro-aluminum（PAF）The coagulating treatment for the simulated water sample prepared for kaolin and heavy metal.Raw water turbidity is 25 ~ 43 NTU, pH value
For 7.92 ~ 8.04, Pb2+For 0.5 mg/L, water temperature is 15 DEG C.Handling result is listed in table 3.
3 water process of table removes Pb with banana skin high-molecular coagulant adopting and PAF coagulations2+Contrast, dosage is 2 mL
From above handling result as it can be seen that and polymeric ferric aluminum（PAF）Compare, water process banana skin high-molecular coagulant adopting has
More excellent Pb2+Removal capacity.
Claims (1)
- A kind of 1. water process preparation method of banana skin high-molecular coagulant adopting, it is characterised in that water process banana skin high score The component and weight percent content of sub- coagulant be：Banana skin 1.5% ~ 15%Water 79% ~ 98%Mass fraction is 15% ~ 45% sodium hydroxide solution 0.08% ~ 3.5%Mass fraction is 10% ~ 13% liquor natrii hypochloritis 0%<x≤3.5%Mass fraction is 14% ~ 15% Kathon CG solution 0%<Y≤0.015%, water process are mixed with banana skin macromoleculeThe preparation method of solidifying agent includes the following steps：（1）Banana skin is dried, and is ground into powdered；（2）Under 150 revs/min ~ 300 revs/min of mixing speed, 30 DEG C ~ 50 DEG C of 79% ~ 98% water is added to 1.5% In ~ 15% powdered banana skin, stir 1 minute ~ 5 minutes, then when continuous heating 1 is small at a temperature of 30 DEG C ~ 50 DEG C ~ it is 4 small When, extraction mixed liquor is obtained, it is spare；（3）Under conditions of 300 revs/min ~ 800 revs/min of mixing speeds and temperature are 30 DEG C ~ 50 DEG C, by 0.08% ~ The sodium hydroxide solution that 3.5% mass fraction is 15% ~ 45% is added in said extracted mixed liquor, stirs 10 minutes ~ 25 points Clock, obtains the poly- liquid of alkali, spare；（4）Under conditions of 150 revs/min ~ 350 revs/min of mixing speeds and temperature are 30 DEG C ~ 50 DEG C, content is more than 0% and less than or equal to 3.5% mass fraction be 10% ~ 13% liquor natrii hypochloritis be added in the poly- liquid of above-mentioned alkali, stir 3 minutes ~ 10 minutes, obtain the poly- distiller liquor of alkali, then 150 revs/min ~ 350 revs/min mixing speed and temperature be 30 DEG C ~ 50 DEG C Under conditions of, by content be more than 0% and less than or equal to 0.015% active principle mass fraction be 14% ~ 15% Kathon CG solution It is added in the poly- distiller liquor of above-mentioned alkali, stirs 3 minutes ~ 10 minutes, stop stirring, stand curing at room temperature, controls the curing time For 0.5 it is small when ~ 24 it is small when, dark brown or yellowish-brown water process banana skin high-molecular coagulant adopting fluid product is made；（5）Using reverse contact spray drying process or naturally dry method or freezing by aforesaid liquid product solidification, reverse Contact in spray drying process, hot air flowrate 300m3/h~550m3/ h, hot-air inlets temperature is 100 DEG C ~ 105 DEG C, certainly So dry in method, by above-mentioned water process banana skin high-molecular coagulant adopting fluid product naturally dry, crush, in freezing, Cryogenic temperature control is -40 DEG C ~ -10 DEG C, and drabon color or khaki powdered solid product is made.
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| CN106219715A (en) * | 2016-09-20 | 2016-12-14 | 济南大学 | A kind of preparation method of oxidation modification Pericarpium Musae coagulant |
| CN106830255A (en) * | 2017-03-03 | 2017-06-13 | 济南大学 | A kind of coagulation process of the banana skin water treatment agent without mixed process |
| CN107416986A (en) * | 2017-09-05 | 2017-12-01 | 济南大学 | A kind of preparation method of natural polymer organic matter microorganism integral type coagulant |
| CN108128869A (en) * | 2018-01-19 | 2018-06-08 | 济南大学 | The preparation method of one specific admixture fruit peel-microorganism integral type coagulant |
| CN112551667A (en) * | 2020-11-13 | 2021-03-26 | 济南大学 | Preparation technology of natural polymer type pineapple peel residue coagulant |
| CN114804330A (en) * | 2022-05-30 | 2022-07-29 | 水发规划设计有限公司 | Application method of pericarp coagulant of low-carbon-source sewage with external carbon source |
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| CN102276037A (en) * | 2011-08-12 | 2011-12-14 | 南开大学 | Method for preparing environment-friendly and efficient composite flocculant |
| EP2502656A1 (en) * | 2009-11-18 | 2012-09-26 | Tokyo University of Marine Science and Technology | Flocculating agent starting material using brown algae as starting material, flocculating agent using said starting material, preparation method for said flocculating agent, and purification method using said flocculating agent |
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| EP2502656A1 (en) * | 2009-11-18 | 2012-09-26 | Tokyo University of Marine Science and Technology | Flocculating agent starting material using brown algae as starting material, flocculating agent using said starting material, preparation method for said flocculating agent, and purification method using said flocculating agent |
| CN102276037A (en) * | 2011-08-12 | 2011-12-14 | 南开大学 | Method for preparing environment-friendly and efficient composite flocculant |
| CN102992461A (en) * | 2012-11-25 | 2013-03-27 | 溧阳市天目湖保健品有限公司 | Method for producing coagulant aid through utilizing winter bamboo shoot skins |
| CN103788381A (en) * | 2014-01-21 | 2014-05-14 | 浙江理工大学 | Preparation method of cationized cellulose-based flocculating agent |
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