CN110217871A - A kind of highly effective coagulation algae-removing method of the raw water containing algae - Google Patents
A kind of highly effective coagulation algae-removing method of the raw water containing algae Download PDFInfo
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- CN110217871A CN110217871A CN201910412824.2A CN201910412824A CN110217871A CN 110217871 A CN110217871 A CN 110217871A CN 201910412824 A CN201910412824 A CN 201910412824A CN 110217871 A CN110217871 A CN 110217871A
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- algae
- chitosan
- raw water
- water containing
- aluminium polychloride
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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
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
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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
- C02F1/5263—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using natural chemical compounds
-
- 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
- C02F1/56—Macromolecular compounds
Abstract
The invention discloses a kind of highly effective coagulation algae-removing method of raw water containing algae, this method carries out in the steps below: (1) configuring chitosan and aluminium polychloride stock solution；50mg chitosan is dissolved in 5mL 0.1mol/L hydrochloric acid solution, stirring be completely dissolved to chitosan after with deionized water dilute 0.05g/L chitosan stock solution, by aluminium polychloride with deionized water dilute 0.25g/L aluminium polychloride stock solution；(2) chitosan and aluminium polychloride stock solution are sufficiently mixed according to required dosage；(3) coagulation method are as follows: 1) 200r/min, which quickly stirs 10s, is uniformly mixed raw water containing algae；2) 200r/min quickly stirs 1min after adding coagulant；3) 60r/min moderate-speed mixer 10min；4) 30r/min mixes slowly 15min；5) 30min is stood.The present invention uses chitosan and aluminium polychloride combination, it can be achieved that efficient, safe alga removalby coagulation, except algae effect is good, quick, easy to operate, application value with higher.
Description
Technical field
The invention belongs to water treatment fields, and in particular to a kind of highly effective coagulation algae-removing method of the raw water containing algae.
Background technique
The outburst of drinking water source algae not only influences the normal operation of drinking water treatment systems, even more threatens numerous citizen
Water safety.When algal bloom, it is different from general cause absurd creature matter, frustule electro kinetic potential is low, density is smaller, glue
Body is stablized, and easily with coagulant complex reaction occurs for algae organic matter, influences the formation of wadding body in coagulation process, increases at water
The difficulty of reason.Researcher is often by the modes enhanced-coagulation such as pre-oxidation, pre- ultrasound, precompression, but these methods exist
The problems such as algae toxin discharges, generates disinfection by-products, safety is poor.Therefore, the efficient algae-removing method of research safety, to drinking water
The guarantee of water supply security is of great significance.
The iron aluminium coagulant such as aluminium polychloride, aluminium chloride, iron chloride and polyaluminum ferric chloride is in conventional drinking water technology
Common coagulant, but using single coagulant to the alga removalby coagulation less effective of the raw water containing algae.Chitosan is to be currently known positive electricity
The highest natural organic high-molecular of lotus density, it is safe and nontoxic, possess stronger electrically neutralization and adsorption bridging ability.It is confined to
The manufacturing cost of chitosan, researcher tends to for chitosan and inorganic coagulant being used in combination more, to improve coagulation effect
And reduce economic cost.Hair rubine etc. helps to improve aluminium polychloride to kaolin the study found that using chitosan as flocculation aid
Coagulation effect, and improve the stability (being published in China Environmental Science, 2015,35 (04): 1096-1102) of coagulation.
Summary of the invention
Aiming at the problem that conventional drinking water treatment technique alga removalby coagulation less effective, the present invention proposes a kind of raw water containing algae
Highly effective coagulation algae-removing method.
The present invention is achieved through the following technical solutions:
A kind of highly effective coagulation algae-removing method of the raw water containing algae, this method are used in combination using chitosan and aluminium polychloride as mixed
Solidifying agent.
This method carries out in the steps below:
(1) chitosan and aluminium polychloride stock solution are configured；50mg chitosan is dissolved in 5mL 0.1mol/L hydrochloric acid solution, is stirred
After being completely dissolved to chitosan with deionized water dilute 0.05g/L chitosan stock solution, by aluminium polychloride deionization
Water dilute 0.25g/L aluminium polychloride stock solution；
(2) chitosan and aluminium polychloride stock solution are sufficiently mixed according to required dosage；
(3) coagulation method are as follows: 1) 200r/min, which quickly stirs 10s, is uniformly mixed raw water containing algae；2) 200r/ after addition coagulant
Min quickly stirs 1min；3) 60r/min moderate-speed mixer 10min；4) 30r/min mixes slowly 15min；5) standing 30min is
It can.
Among the above, the raw water containing algae is the raw water containing algae that microcystic aeruginosa is formed, CTS dosage in step (3)
0.40mg/L, PAC dosage 1.19mg/L, the initial pH value of raw water containing algae 7.5.
Among the above, the raw water containing algae is the raw water containing algae that Anabaena Flos-aquae is formed, the initial pH value of raw water containing algae 7.9, step
Suddenly CTS dosage 0.25mg/L, PAC dosage 2.00mg/L in (3).
Aluminium polychloride is a kind of inorganic polymer flocculant, and because it is easily hydrolyzed, coagulation effect is good, for conventional drink
With the flocculant that water treatment technology is common, but it is not satisfactory to the coagulation removal effect of frustule.Chitosan is to be currently known just
The highest natural organic high-molecular of charge density, there are great amount of hydroxy group and amino on molecule, after being dissolved in dilute acid soln, on molecule
Amino is protonated and possesses a large amount of positive charges, it is made to possess stronger electrically neutralization and adsorption bridging ability.Chitosan shell is poly-
The combination of sugar and aluminium polychloride further enhances electrically neutralization and adsorption bridging acts on, and has to raw water containing algae efficient mixed
Solidifying sedimentation effect.
Technical problem to be solved by the invention is to provide a kind of coagulation minimizing technology of raw water containing algae efficiently, safe, energy
Raw water containing algae when enough quickly reply cyanobacterial bloom outbursts, realizes the emergency processing to the raw water containing algae, except algae effect is good, takes effect
Fastly, easy to operate, how raw water containing algae is quickly handled with important theory and realistic meaning to drinking water plant.With exclusive use
Chitosan is compared with aluminium polychloride, and the wadding body volume that coagulation can be made to generate chitosan and aluminium polychloride combination is bigger, is mixed
It is solidifying and to may be directly applied to the coagulation of the raw water containing algae except algae effect is good, without preconditioning the pH value of the alkaline raw water containing algae, at saving
Manage cost.Chitosan and aluminium polychloride combination can also reduce water outlet Residual Aluminum Content, reduce the health risk of water supply residual Al.
Detailed description of the invention
Fig. 1 is the response surface design figure of chitosan and aluminium polychloride combination to microcystic aeruginosa chlorophyll a removal rate.
Fig. 2 is the response surface design figure of chitosan and aluminium polychloride combination to Anabaena Flos-aquae chlorophyll a removal rate.
Specific embodiment
Below with reference to examples and drawings, the present invention is described in detail, and embodiments of the present invention are not limited thereto.
Embodiment
A kind of method that chitosan (CTS) and aluminium polychloride (PAC) combination highly effective coagulation remove algae, comprising the following steps:
(1) molecular weight of chitosan is 70 ~ 800,000, viscosity 60mpas, and deacetylation >=90.0%(manufacturer was upper sea blue season
Biological Co., Ltd), it weighs 50mg CTS and is dissolved in 5mL 0.1mol/L hydrochloric acid solution, extremely in stirring 30min on magnetic stirring apparatus
Be completely dissolved, with deionized water dilute 0.05g/L stock solution.Aluminium polychloride is drinking water first class product, and stock solution is dense
Degree is 0.25g/L.Chitosan and aluminium polychloride stock solution are added after mixing.
(2) microcystic aeruginosa (FACHB-909) and Anabaena Flos-aquae (FACHB-245) are originated from Chinese Academy of Sciences's fresh water algae
Library.For the water quality for simulating drinking water source alga eruption, the algae culturing liquid for growing to logarithmic growth phase is distributed in deionized water,
Being diluted to algae cell density is 3.0 × 108~4.0×108Cells/L, microcystic aeruginosa and Anabaena Flos-aquae Chlorophyll-a Content point
Not Wei 45 ~ 55 μ g/L and 80 ~ 90 μ g/L, this is to be used for the raw water containing algae of experimental study, and the initial pH value of the raw water containing algae is 8.5
~9.0。
(3) beaker is added in 1000mL raw water containing algae, uses 0.1mol/L HCl or 0.1mol/L NaOH tune as needed
Save the pH value of raw water containing algae.Carry out coagulation experiment using six blenders, steps are as follows: 1) 200r/min, which quickly stirs 10s, makes water
Sample is uniformly mixed；2) 200r/min quickly stirs 1min after adding coagulant；3) 60r/min moderate-speed mixer 10min；4) 30r/
Min mixes slowly 15min；5) 30min is stood.Supernatant measurement chlorophyll a is taken to contain after standing at 2cm below liquid level
Amount.
The Chlorophyll-a Content of the raw water containing algae is measured using acetone extraction before coagulation and after coagulation.
Using Response Surface Method contrived experiment, CTS dosage, PAC dosage and the initial pH value of raw water containing algae are obtained most
Good coagulation condition, the coding and code levels of each factor are shown in Table 1.
1 empirical factor of table and level
Using chlorophyll a removal rate as model response, experimental program and it the results are shown in Table 2.
2 experimental design of table and result
It is fitted the functional relation between influence factor and response with quadratic regression equation, CTS dosage, PAC are added and initial pH
Regression equation with microcystic aeruginosa and Anabaena Flos-aquae chlorophyll a removal rate is respectively YCopper=92.31+4.93A+3.32B-
4.83C- 1.84AB+3.31AC+3.75BC-1.43A2-2.48B2-1.82C2And YWater=95.57-0.38A+2.71B-1.76C-
0.57AB+0.68AC+ 1.59BC-2.03 A2-1.49B2-1.74C2。
The significance test result of regression equation and variance analysis are shown in Table 3, are formed to microcystic aeruginosa and Anabaena Flos-aquae
Raw water containing algae carry out the resulting model of fit of coagulation P value be respectively less than 0.001, show gained model be all extremely significant.It loses
The P value of quasi- item (LOF) is higher than 0.1, shows to lose influence of the quasi- item to models fitting not significant, illustrates to be fitted mould in regression region
The fitting effect of type is good.The degree of fitting of model can pass through coefficient of determination R2It examines, R2> 0.95 shows that degree of fitting is higher, determines system
Number R2With adjustment coefficient of determination Radj 2Difference less than 0.2, illustrate that the confidence level of model and precision are higher.AP is signal-to-noise ratio, than
It is ideal value that value, which is greater than 4,.Therefore, experiment gained model can be used for analyzing and predicting removing chlorophyll a under different coagulation conditions
Except effect.
3 model variance analysis of table
By the response surface design figure of Fig. 1 microcystic aeruginosa chlorophyll a removal rate it is found that with the increase of PAC and CTS dosage, containing
The initial pH of algae raw water is reduced, and chlorophyll a removal effect is better.
By the response surface design figure of Fig. 2 Anabaena Flos-aquae chlorophyll a removal rate it is found that chlorophyll a removal rate is added with PAC
The increase of amount and increase；With the increase of CTS dosage, chlorophyll a removal takes the lead in reducing after increasing；Chlorophyll a removal rate with
The reduction of the initial pH of raw water containing algae, in first increasing the trend reduced afterwards.
The optimum condition of chitosan and aluminium polychloride combination coagulation removal microcystic aeruginosa are as follows: CTS dosage 0.40mg/
L, PAC dosage 1.19mg/L, the initial pH value of raw water containing algae 7.5, surveying chlorophyll a removal rate under this condition is 95.7%(model
Predicted value 96.1%).The optimum condition of coagulation removal Anabaena Flos-aquae are as follows: CTS dosage 0.25mg/L, PAC dosage
2.00mg/L, the initial pH value of raw water containing algae 7.9, surveying chlorophyll a removal rate under this condition is 97.0%(model predication value
97.9%).
When the initial pH value of raw water containing algae is 9.0 (alkaline environment of simulation raw water containing algae), efficient coagulation can also be obtained
Except algae effect, 95% or so is all up to the removal rate except microcystic aeruginosa and the chlorophyll a of Anabaena Flos-aquae.
Claims (4)
1. a kind of highly effective coagulation algae-removing method of raw water containing algae, which is characterized in that this method uses chitosan and aluminium polychloride
It is used in combination as coagulant.
2. a kind of highly effective coagulation algae-removing method of raw water containing algae according to claim 1, which is characterized in that this method is pressed
State step progress:
(1) chitosan and aluminium polychloride stock solution are configured；50mg chitosan is dissolved in 5mL 0.1mol/L hydrochloric acid solution, is stirred
After being completely dissolved to chitosan with deionized water dilute 0.05g/L chitosan stock solution, by aluminium polychloride deionization
Water dilute 0.25g/L aluminium polychloride stock solution；
(2) chitosan and aluminium polychloride stock solution are sufficiently mixed according to required dosage；
(3) coagulation method are as follows: 1) 200r/min, which quickly stirs 10s, is uniformly mixed raw water containing algae；2) 200r/ after addition coagulant
Min quickly stirs 1min；3) 60r/min moderate-speed mixer 10min；4) 30r/min mixes slowly 15min；5) standing 30min is
It can.
3. a kind of highly effective coagulation algae-removing method of raw water containing algae according to claim 2, which is characterized in that described former containing algae
Water is the raw water containing algae that microcystic aeruginosa is formed, and CTS dosage 0.40mg/L, PAC dosage 1.19mg/L in step (3), is contained
Algae raw water initial pH value 7.5.
4. a kind of highly effective coagulation algae-removing method of raw water containing algae according to claim 2, which is characterized in that described former containing algae
Water is the raw water containing algae that Anabaena Flos-aquae is formed, and CTS dosage 0.25mg/L, PAC dosage 2.00mg/L in step (3), is contained
Algae raw water initial pH value 7.9.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110550716A (en) * | 2019-08-25 | 2019-12-10 | 天津大学 | Algaecide for repairing urban river algae pollution and preparation method thereof |
| CN112607838A (en) * | 2020-12-07 | 2021-04-06 | 武汉市鄂正农科技发展有限公司 | Flocculating agent and method for treating cyanobacterial bloom |
| CN114671546A (en) * | 2022-04-02 | 2022-06-28 | 中国科学院水生生物研究所 | Method for removing algae in water body by enhanced coagulation for eliminating algae-derived organic matter inhibition |
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| CN114671546A (en) * | 2022-04-02 | 2022-06-28 | 中国科学院水生生物研究所 | Method for removing algae in water body by enhanced coagulation for eliminating algae-derived organic matter inhibition |
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