CN106971080A - A kind of modification biological charcoal adsorbs the response surface optimization method of Phosphorus From Wastewater - Google Patents
A kind of modification biological charcoal adsorbs the response surface optimization method of Phosphorus From Wastewater Download PDFInfo
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- 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
- C02F1/28—Treatment of water, waste water, or sewage by sorption
- C02F1/283—Treatment of water, waste water, or sewage by sorption using coal, charred products, or inorganic mixtures containing them
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Abstract
The present invention relates to a kind of response surface optimization method that modification biological charcoal adsorbs Phosphorus From Wastewater, preparation including modification biological charcoal, Plackett Burman experiments, steepest hill climbing test, response surface optimization method, set up secondary multivariate regression models equation and carry out variance analysis and significance analysis, utilize Design Expert 8.0.5 softwares to carry out plot analysis independent variable and response Y relation according to secondary multivariate regression models, the response surface figure of regression equation is obtained, the steps such as the optimal adsorption conditionses of Dynamic Adsorption are obtained.Compared with prior art, the present invention passes through modification biological charcoal made from infusion method, property is stable, adsorption capacity is stronger, utilize adsorption process of the response surface optimization modification biological charcoal to phosphorus, only need 15 groups of experiments to can obtain optimum results, obtain optimal adsorption conditionses and maximum adsorption capacity of the modification biological charcoal to phosphorus.
Description
Technical field
The present invention relates to field of waste water treatment, the response surface for adsorbing Phosphorus From Wastewater more particularly, to a kind of modification biological charcoal is excellent
Change method.
Background technology
One of three big nutrients necessary to phosphorus is plant growth.However, the phosphorus in water body can excessively cause water body richness battalion
Fosterization, destroys the ecosystem.The eutrophication of acceleration not only influences water ecosystem, can also hinder the development of the economy indirectly.
At present, a variety of methods are used to remove phosphorus excessive in water body.But these methods are difficult to recycle in the phosphorus in waste water, not
The product of sustainable development can be changed into.
At present, there are some researches show magnesium-modified charcoal can be used for adsorbing the phosphorus in waste water, and be used as phosphorus slow-release fertilizer.But
This method of modifying has more limitation, and such as magnesium salts particle is mixed with forest material, it is difficult to reach uniform；Adsorption conditionses are not excellent
Change, adsorption capacity is smaller.In waste water in modification biological charcoal Phosphate Sorption process, the parameter being related to is a lot, obtains optimal adsorption bar
Part is difficult point.Response surface optimization method has been used for the condition optimizing of various procedures, can effectively assess multiple parameters and ginseng
The interaction of several, overcomes the shortcomings of single factor experiment, and optimal adsorption conditionses are found with less test number (TN).Response surface
It is used for optimization extraction conditions and method.But, there is presently no this kind of method is applied into phosphorus field of waste water treatment.
Chinese patent CN103333068A discloses the extracting method for optimizing jerusalem artichoke straw chlorogenic acid using Response Surface Method,
This method comprises the following steps：(1) prepared by sample solution：Jerusalem artichoke stalk is cleaned, the second of various concentrations is dried, crushes and add
Alcoholic solution is extracted, and the extract solution corresponding to different concentration ethanol solution is obtained through centrifugation, precipitation；Corresponding to various concentrations second
The extract solution of alcoholic solution is settled to same volume；(2) each extract solution Content of Chlorogenic Acid is determined with HPLC methods；(3) experimental design
With statistical analysis：1. single factor experiment；2. response phase method optimization design：According to single factor experiment result, choose chlorogenic acid and extract
The more significant Extraction solvent concentration of alcohol of influential effect, extraction time, Extracting temperature, solid-liquid ratio this 4 factors, set up polynary two
Secondary regression equation 2；(4) analysis of experimental results and optimization：Plot analysis is carried out using the softwares of Design Expert 8.0, is returned
Return the response surface and its contour map of equation.But the patent is that Response Surface Method is applied to the extraction in jerusalem artichoke straw chlorogenic acid
In, nor the application in field of waste water treatment.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is excellent using response surface
Change in waste water charcoal to the adsorption process of phosphorus, be to initial phosphorus concentration, adsorbent mass, pyrolysis temperature, initial pH, rotating speed and
These factors larger to phosphorus Adsorption Effect of absorbent particles size carry out screening dominant factor and optimization, so as to improve to phosphorus
Adsorption capacity.Prepare modification biological charcoal and applied to the absorption of Phosphorus From Wastewater, response surface optimization modification biological charcoal is adsorbed to phosphorus
Capacity.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of modification biological charcoal adsorbs the response surface optimization method of Phosphorus From Wastewater, using following steps：
(1) preparation of modification biological charcoal：
Biomass is soaked in MgCl2Ultrasound is uniform in the aqueous solution, is placed in Muffle furnace and is pyrolyzed after drying, then cools down
To room temperature, deionization cleaning, drying obtains modification biological charcoal sorbing material, passes through MgCl2Aqueous solution soaking biomass, makes life
Material can be well mixed with Mg, and obtained modification biological charcoal Phosphate Sorption ability is stronger；
(2) Plackett-Burman is tested：
With adsorbent mass, initial phosphorus concentration, pyrolysis temperature, initial pH, granular size and rotating speed are that variable is used for sieve
The dominant factor of choosing influence Phosphate Sorption, is carried out according to Design Expert 8.0.5 software Plackett-Burman experimental designs
Experimental design, obtains influenceing the dominant factor of phosphorus absorption with less test number (TN) screening；
(3) steepest hill climbing test：
The dominant factor that the influence phosphorus filtered out according to step (2) is adsorbed, steep hill climbing test is based on Plackett-Burman
Result of the test sets step-length and change direction, makes dominant factor while approaching optimal neighborhood to obtain more excellent region；
(4) response surface optimization method：
According to step (3) steepest hill climbing test result, to influence significant pyrolysis temperature, initial phosphorus concentration and adsorbent matter
Measure as independent variable, phosphorus adsorption capacity is response Y, using Design Expert 8.0.5 softwares according to Box-Behnken
Design design principles carry out experimental design, determine adsorption capacity of the modification biological charcoal to phosphorus；
(5) multiple regression analysis is carried out according to the data of step (4), sets up secondary multivariate regression models equation：
Y=-6536+18.5X1-0.43X2+8972X3+8.8X1X2-1.9X1X3+3.4X2X3-0.01X1 2-X2 2-
76250X3 2, wherein response Y is phosphorus adsorption capacity, X1For pyrolysis temperature, X2Initial phosphorus concentration, X3Adsorbent mass；
(6) variance analysis and significance analysis are carried out to secondary multivariate regression models equation, intended according to being lost to regression equation
P value examine lose intend it is whether notable, determine whether quadratic regression equation appropriate, according to significance test, determine that regression equation is
It is no notable, according to R2With Adj R2, determine the predictive value of model；
(7) plot analysis independent variable is carried out according to secondary multivariate regression models using Design Expert 8.0.5 softwares
With response Y relation, the response surface figure of regression equation is obtained, the optimal adsorption conditionses of Dynamic Adsorption are obtained.
The biomass used in step (1) includes cow dung, chicken manure, biogas residue, rice husk, maize straw, wheat stalk or cotton
Stalk, as preferred embodiment, can use cow dung.
MgCl2The concentration of the aqueous solution is 0.5-1g/ml, and the addition of biomass is 5-20g/50mlMgCl2The aqueous solution.It is raw
Material screening is 0.125mm-4.75mm.It is 300-750 DEG C that pyrolysis temperature is controlled in Muffle furnace, is pyrolyzed 1-6h.
It it is 450-700 DEG C as pyrolysis temperature preferred embodiment, in Muffle furnace is controlled.
Phosphorus in the modification biological charcoal sorbing material absorption waste water prepared using step (1), modification biological charcoal is inhaled
Enclosure material is placed in certain density solution containing phosphate, at a certain temperature, by different rotating speeds, and 12-72h is to adsorption equilibrium for vibration,
Filtering, determines the content of phosphorus in filtrate, and phosphorus adsorption capacity is calculated using following methods：
Wherein, Y is phosphorus adsorption capacity, CoAnd CeRespectively phosphorus solution is initial and equilibrium concentration (mg L-1), V is phosphorus solution
Volume (L), M be modification biological charcoal sorbing material use quality (g).
Initial phosphorus concentration is 250-500mg/L in phosphorus solution in step (2), and modification biological charcoal sorbing material quality is 0.1-
0.3g, 15-60 DEG C of the temperature used during modification biological charcoal sorbing material Phosphate Sorption, initial pH is 4-8, and rotating speed is 60-120rpm,
The granular size of modification biological charcoal sorbing material is 150-425 μm.
Dominant factor described in step (3) is pyrolysis temperature, initial phosphorus concentration and adsorbent mass.
Compared with prior art, the present invention has advantages below：
1. the present invention is higher by the content of modification biological carbon surface magnesium made from infusion method, it is more evenly distributed, charcoal
Phosphorus in the magnesium and solution on surface reacts to form Mg-P crystal, improves the ability of modification biological charcoal Phosphate Sorption.Property is stable,
Adsorption capacity is stronger.
2. response surface optimization method is applied to adsorption process of the modification biological charcoal to phosphorus by the present invention, adsorption capacity is being improved
While, overcome single factor experiment often, the cycle it is big compared with long and workload, and lack the reciprocation between each factor
The shortcomings of, it is only necessary to 15 groups of experiments are that can obtain optimum results, obtain modification biological charcoal to the optimal adsorption conditionses of phosphorus and maximum suction
Attached capacity, substantially increases the adsorption capacity of modification biological charcoal.
Brief description of the drawings
Fig. 1 is the standard effect para figure of 6 kinds of important factor in order of the invention；
Fig. 2 is adsorbent mass of the present invention, the response surface graphics of initial phosphorus concentration and pyrolysis temperature to phosphorus adsorption capacity.
Embodiment
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.Following examples will be helpful to this area
Technical staff further understand the present invention, but the invention is not limited in any way.It should be pointed out that to the general of this area
For logical technical staff, without departing from the inventive concept of the premise, various modifications and improvements can be made.These are belonged to
Protection scope of the present invention.
Embodiment 1
(1) preparation of modification biological charcoal：
Weigh 30gMgCl2In 50ml deionized waters, MgCl is obtained2The aqueous solution, the cow dung bits of 10g100 mesh sieves are soaked in
MgCl2The aqueous solution, is mixed, ultrasound two hours, and drying is placed in Muffle furnace, is pyrolyzed 1h, is cooled to room temperature, deionization cleaning 5
Time, drying obtains the modification biological charcoal sorbing material of the Phosphate Sorption of the present embodiment.
(2) Plackett-Burman is tested：
Adsorbent mass, initial phosphorus concentration, pyrolysis temperature, initial pH, granular size and rotating speed etc. are adsorbed with important to phosphorus
The variable of influence is used for the dominant factor of screening influence Phosphate Sorption.According to Design Expert 8.0.5 softwares Plackett-
Burman experimental designs carry out experimental design, and design result is shown in Table 1.
Table 1Plackett-Burman experimental designs (dominant factor screening design)
Fig. 1 is the standard effect para figure of 6 kinds of important factor in order of the invention, is the experiment knot obtained according to step (2)
Really, it can be seen that pyrolysis temperature, initial phosphorus concentration and adsorbent mass influence notable to adsorption capacity, be chosen based on
Imitate the factor.Wherein, pyrolysis temperature and initial phosphorus concentration are positive-effect, and adsorbent mass influence significantly and is most negative effect.
(3) steepest hill climbing test：
The dominant factor that the influence phosphorus filtered out according to (2) is adsorbed, steep hill climbing test is tested based on Plackett-Burman
As a result step-length and change direction be set, experimental design and 2 are the results are shown in Table.
The experimental design and result of the steepest hill climbing test of table 2
As shown in Table 3, the adsorption capacity of processing 4 is maximum, therefore to handle 40 water for being Box-Behnken experimental designs
It is flat.
(4) response surface optimization method：
According to step (3) steepest hill climbing test result, to influence significant pyrolysis temperature, initial phosphorus concentration and adsorbent matter
Measure as independent variable, phosphorus adsorption capacity is response Y, using Design Expert 8.0.5 softwares according to Box-Behnken
Design design principles carry out experimental design, experimental design and the results are shown in Table 3.
Table 3.Box-Behnken experimental designs and result
(5) multiple regression analysis is carried out according to the data of step (4), sets up secondary multivariate regression models equation：
Y=-6536+18.5X1-0.43X2+8972X3+8.8X1X2-1.9X1X3+3.4X2X3-0.01X1 2-X2 2-76250X3 2
Wherein, response Y is phosphorus adsorption capacity, X1For pyrolysis temperature, X2Initial phosphorus concentration, X3Adsorbent mass.
(6) variance analysis and significance analysis are carried out to secondary multivariate regression models equation, analysis result is shown in Table 4.
The response surface data variance analysis result of table 4.
From analysis of variance table (table 4), the model level of signifiance is less than 0.001, and model loses the property intended and is more than 0.05, dependent variable
With independent variable linear dependence (R2=0.9916), so the regression equation model is extremely significant.
(7) plot analysis independent variable is carried out according to secondary multivariate regression models using Design Expert 8.0.5 softwares
With response Y relation, the response surface figure of regression equation is obtained.
Fig. 2 is adsorbent mass of the present invention, the response surface graphics of initial phosphorus concentration and pyrolysis temperature to phosphorus adsorption capacity.
The response surface graphics that figure a influences for absorption agent dose and initial phosphorus concentration on adsorption capacity, figure b is initial phosphorus concentration and pyrolysis
The response surface graphics that temperature influences on adsorption capacity, the sound that figure c influences for absorption agent dose and pyrolysis temperature on adsorption capacity
Answer face graphics；Initial phosphorus concentration is higher as can be seen from Figure, and adsorption capacity is bigger.Adsorbent mass and pyrolysis temperature are inhaled to phosphorus
It is attached to there is reciprocation.
It can be seen from model, the optimal adsorption conditionses that modification biological charcoal is adsorbed to phosphorus are initial phosphorus concentration 600mg L-1, heat
Solve 700 DEG C of temperature, adsorbent mass 0.06g.On this condition, the maximum phosphorus adsorption capacity of modification biological charcoal is 340mg g-1, it is real
The phosphorus maximum adsorption capacity that border is measured is 345mg g-1, it is close with predicted value.
Embodiment 2
A kind of modification biological charcoal adsorbs the response surface optimization method of Phosphorus From Wastewater, using following steps：
(1) preparation of modification biological charcoal：
It is 0.125mm that the pre- advanced sieving of 5g chicken manures, which is divided to particle diameter, and it is 0.5g/ml's to be then soaked in 50ml concentration
MgCl2It is in the aqueous solution and ultrasonic uniform, progress pyrolysis 6h in Muffle furnace is placed in after drying, pyrolysis temperature is controlled at 300 DEG C, then cold
But to room temperature, deionization cleaning, drying obtains modification biological charcoal sorbing material, passes through MgCl2Aqueous solution soaking chicken manure, makes chicken
Excrement can be well mixed with Mg, and obtained modification biological charcoal Phosphate Sorption ability is stronger
It it is 150 μm by 0.1g granular sizes using the phosphorus in the modification biological charcoal sorbing material absorption waste water prepared
Modification biological charcoal sorbing material be placed in initial phosphorus concentration for 250mg/L, pH is in 4 solution containing phosphate, to control rotating speed
60rpm, 15 DEG C of temperature, vibration 12h to adsorption equilibrium, filtering determines the content of phosphorus in filtrate, and phosphorus adsorption capacity is used with lower section
Method is calculated：
Wherein, Y is phosphorus adsorption capacity, CoAnd CeRespectively phosphorus solution is initial and equilibrium concentration (mg L-1), V is phosphorus solution
Volume (L), M be modification biological charcoal sorbing material use quality (g).
(2) Plackett-Burman is tested：
With adsorbent mass, initial phosphorus concentration, pyrolysis temperature, initial pH, granular size and rotating speed are that variable is used for sieve
The dominant factor of choosing influence Phosphate Sorption, is carried out according to Design Expert 8.0.5 software Plackett-Burman experimental designs
Experimental design, obtains influenceing the dominant factor of phosphorus absorption with less test number (TN) screening；
(3) steepest hill climbing test：
The dominant factor that the influence phosphorus filtered out according to step (2) is adsorbed, including pyrolysis temperature, initial phosphorus concentration and absorption
Agent quality, steep hill climbing test is based on Plackett-Burman result of the tests and sets step-length and change direction, makes dominant factor simultaneously
Optimal neighborhood is approached to obtain more excellent region；
(4) response surface optimization method：
According to step (3) steepest hill climbing test result, to influence significant pyrolysis temperature, initial phosphorus concentration and adsorbent matter
Measure as independent variable, phosphorus adsorption capacity is response Y, using Design Expert 8.0.5 softwares according to Box-Behnken
Design design principles carry out experimental design, determine adsorption capacity of the modification biological charcoal to phosphorus；
(5) multiple regression analysis is carried out according to the data of step (4), sets up secondary multivariate regression models equation：
Y=β0+∑βiXi+∑βiiXi 2+∑βijXiXj+ε
Wherein response Y is phosphorus adsorption capacity, X1For pyrolysis temperature, X2Initial phosphorus concentration, X3Adsorbent mass；
(6) variance analysis and significance analysis are carried out to secondary multivariate regression models equation, intended according to being lost to regression equation
P value examine lose intend it is whether notable, determine whether quadratic regression equation appropriate, according to significance test, determine that regression equation is
It is no notable, according to R2With Adj R2, determine the predictive value of model；
(7) plot analysis independent variable is carried out according to secondary multivariate regression models using Design Expert 8.0.5 softwares
With response Y relation, the response surface figure of regression equation is obtained, the optimal adsorption conditionses of Dynamic Adsorption are obtained.
Embodiment 3
A kind of modification biological charcoal adsorbs the response surface optimization method of Phosphorus From Wastewater, using following steps：
(1) preparation of modification biological charcoal：
It is 0.5mm that the pre- advanced sieving of 10g maize straws, which is divided to particle diameter, and it is 0.8g/ml's to be then soaked in 50ml concentration
MgCl2It is in the aqueous solution and ultrasonic uniform, progress pyrolysis 3h in Muffle furnace is placed in after drying, pyrolysis temperature is controlled at 450 DEG C, then cold
But to room temperature, deionization cleaning, drying obtains modification biological charcoal sorbing material, passes through MgCl2Aqueous solution soaking maize straw,
Maize straw is set to be well mixed with Mg, obtained modification biological charcoal Phosphate Sorption ability is stronger
It it is 300 μm by 0.2g granular sizes using the phosphorus in the modification biological charcoal sorbing material absorption waste water prepared
Modification biological charcoal sorbing material be placed in initial phosphorus concentration for 350mg/L, pH is in 7 solution containing phosphate, to control rotating speed
100rpm, temperature 60 C, vibration 48h to adsorption equilibrium, filtering determines the content of phosphorus in filtrate, phosphorus adsorption capacity is using following
Method is calculated：
Wherein, Y is phosphorus adsorption capacity, CoAnd CeRespectively phosphorus solution is initial and equilibrium concentration (mg L-1), V is phosphorus solution
Volume (L), M be modification biological charcoal sorbing material use quality (g).
(2) Plackett-Burman is tested：
With adsorbent mass, initial phosphorus concentration, pyrolysis temperature, initial pH, granular size and rotating speed are that variable is used for sieve
The dominant factor of choosing influence Phosphate Sorption, is carried out according to Design Expert 8.0.5 software Plackett-Burman experimental designs
Experimental design, obtains influenceing the dominant factor of phosphorus absorption with less test number (TN) screening；
(3) steepest hill climbing test：
The dominant factor that the influence phosphorus filtered out according to step (2) is adsorbed, including pyrolysis temperature, initial phosphorus concentration and absorption
Agent quality, steep hill climbing test is based on Plackett-Burman result of the tests and sets step-length and change direction, makes dominant factor simultaneously
Optimal neighborhood is approached to obtain more excellent region；
(4) response surface optimization method：
According to step (3) steepest hill climbing test result, to influence significant pyrolysis temperature, initial phosphorus concentration and adsorbent matter
Measure as independent variable, phosphorus adsorption capacity is response Y, using Design Expert 8.0.5 softwares according to Box-Behnken
Design design principles carry out experimental design, determine adsorption capacity of the modification biological charcoal to phosphorus；
(5) multiple regression analysis is carried out according to the data of step (4), sets up secondary multivariate regression models equation：
Y=β0+∑βiXi+∑βiiXi 2+∑βijXiXj+ε
Wherein response Y is phosphorus adsorption capacity, X1For pyrolysis temperature, X2Initial phosphorus concentration, X3Adsorbent mass；
(6) variance analysis and significance analysis are carried out to secondary multivariate regression models equation, intended according to being lost to regression equation
P value examine lose intend it is whether notable, determine whether quadratic regression equation appropriate, according to significance test, determine that regression equation is
It is no notable, according to R2With Adj R2, determine the predictive value of model；
(7) plot analysis independent variable is carried out according to secondary multivariate regression models using Design Expert 8.0.5 softwares
With response Y relation, the response surface figure of regression equation is obtained, the optimal adsorption conditionses of Dynamic Adsorption are obtained.
Embodiment 4
A kind of modification biological charcoal adsorbs the response surface optimization method of Phosphorus From Wastewater, using following steps：
(1) preparation of modification biological charcoal：
It is 4.75mm that the pre- advanced sieving of 20g cotton stalks, which is divided to particle diameter, and it is 1g/ml's to be then dissolved in 50ml concentration
MgCl2It is in the aqueous solution and ultrasonic uniform, progress pyrolysis 1h in Muffle furnace is placed in after drying, pyrolysis temperature is controlled at 750 DEG C, then cold
But to room temperature, deionization cleaning, drying obtains modification biological charcoal sorbing material, passes through MgCl2Aqueous solution soaking cotton stalk,
Cotton stalk is set to be well mixed with Mg, obtained modification biological charcoal Phosphate Sorption ability is stronger；
It it is 425 μm by 0.3g granular sizes using the phosphorus in the modification biological charcoal sorbing material absorption waste water prepared
Modification biological charcoal sorbing material be placed in initial phosphorus concentration for 500mg/L, pH is in 8 solution containing phosphate, to control rotating speed
120rpm, 40 DEG C of temperature, vibration 72h to adsorption equilibrium, filtering determines the content of phosphorus in filtrate, phosphorus adsorption capacity is using following
Method is calculated：
Wherein, Y is phosphorus adsorption capacity, CoAnd CeRespectively phosphorus solution is initial and equilibrium concentration (mg L-1), V is phosphorus solution
Volume (L), M be modification biological charcoal sorbing material use quality (g).
(2) Plackett-Burman is tested：
With adsorbent mass, initial phosphorus concentration, pyrolysis temperature, initial pH, granular size and rotating speed are that variable is used for sieve
The dominant factor of choosing influence Phosphate Sorption, is carried out according to Design Expert 8.0.5 software Plackett-Burman experimental designs
Experimental design, obtains influenceing the dominant factor of phosphorus absorption with less test number (TN) screening；
(3) steepest hill climbing test：
The dominant factor that the influence phosphorus filtered out according to step (2) is adsorbed, including phosphorus adsorption capacity is pyrolysis temperature, initial
Phosphorus concentration and adsorbent mass, steep hill climbing test are based on Plackett-Burman result of the tests and set step-length and change direction, make
Dominant factor approaches optimal neighborhood to obtain more excellent region simultaneously；
(4) response surface optimization method：
According to step (3) steepest hill climbing test result, to influence significant pyrolysis temperature, initial phosphorus concentration and adsorbent matter
Measure as independent variable, phosphorus adsorption capacity is response Y, using Design Expert 8.0.5 softwares according to Box-Behnken
Design design principles carry out experimental design, determine adsorption capacity of the modification biological charcoal to phosphorus；
(5) multiple regression analysis is carried out according to the data of step (4), sets up secondary multivariate regression models equation：
Y=β0+∑βiXi+∑βiiXi 2+∑βijXiXj+ε
Wherein response Y is phosphorus adsorption capacity, X1For pyrolysis temperature, X2Initial phosphorus concentration, X3Adsorbent mass；
(6) variance analysis and significance analysis are carried out to secondary multivariate regression models equation, intended according to being lost to regression equation
P value examine lose intend it is whether notable, determine whether quadratic regression equation appropriate, according to significance test, determine that regression equation is
It is no notable, according to R2With Adj R2, determine the predictive value of model；
(7) plot analysis independent variable is carried out according to secondary multivariate regression models using Design Expert 8.0.5 softwares
With response Y relation, the response surface figure of regression equation is obtained, the optimal adsorption conditionses of Dynamic Adsorption are obtained.
The specific embodiment of the present invention is described above.It is to be appreciated that the invention is not limited in above-mentioned
Particular implementation, those skilled in the art can make various deformations or amendments within the scope of the claims, this not shadow
Ring the substantive content of the present invention.
Claims (10)
1. a kind of modification biological charcoal adsorbs the response surface optimization method of Phosphorus From Wastewater, it is characterised in that this method uses following step
Suddenly：
(1) preparation of modification biological charcoal：
Biomass is soaked in MgCl2Ultrasound is uniform in the aqueous solution, is placed in Muffle furnace and is pyrolyzed after drying, is cooled to room
Temperature, deionization cleaning, drying obtains modification biological charcoal sorbing material；
(2) Plackett-Burman is tested：
With adsorbent mass, initial phosphorus concentration, pyrolysis temperature, initial pH, granular size and rotating speed are that variable be used to screen shadow
The dominant factor of Phosphate Sorption is rung, is tested according to Design Expert 8.0.5 software Plackett-Burman experimental designs
Design, the dominant factor of screening influence phosphorus absorption；
(3) steepest hill climbing test：
The dominant factor that the influence phosphorus filtered out according to step (2) is adsorbed, steep hill climbing test is tested based on Plackett-Burman
As a result step-length and change direction are set, makes dominant factor while approaching optimal neighborhood to obtain more excellent region；
(4) response surface optimization method：
According to step (3) steepest hill climbing test result, to influence significant pyrolysis temperature, initial phosphorus concentration and adsorbent mass are
Independent variable, phosphorus adsorption capacity is response Y, using Design Expert 8.0.5 softwares according to Box-Behnken Design
Design principle carries out experimental design, determines adsorption capacity of the modification biological charcoal to phosphorus；
(5) multiple regression analysis is carried out according to the data of step (4), sets up secondary multivariate regression models equation：
Y=-6536+18.5X1-0.43X2+8972X3+8.8X1X2-1.9X1X3+3.4X2X3-0.01X1 2-X2 2-76250X3 2, its
Middle response Y is phosphorus adsorption capacity, X1For pyrolysis temperature, X2Initial phosphorus concentration, X3Adsorbent mass；
(6) variance analysis and significance analysis are carried out to secondary multivariate regression models equation, the p value intended is lost according to regression equation
Examine to lose and whether notable intend, determine whether quadratic regression equation is appropriate, according to significance test, determine whether regression equation shows
Write, according to R2With Adj R2, determine the predictive value of model；
(7) plot analysis independent variable and sound are carried out according to secondary multivariate regression models using Design Expert 8.0.5 softwares
Should value Y relation, obtain the response surface figure of regression equation, obtain the optimal adsorption conditionses of Dynamic Adsorption.
2. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In the biomass described in step (1) includes cow dung, chicken manure, biogas residue, rice husk, maize straw, wheat stalk or cotton stalk.
3. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In the biomass described in step (1) is preferably cow dung.
4. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In the MgCl described in step (1)2The concentration of the aqueous solution is 0.5-1g/ml, and the addition of biomass is 5-20g/50mlMgCl2
The aqueous solution.
5. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In the biomass screening described in step (1) is 0.125mm-4.75mm.
6. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In step (1) controls pyrolysis temperature to be 300-750 DEG C in Muffle furnace, is pyrolyzed 1-6h.
7. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In step (1) controls pyrolysis temperature to be 450-700 DEG C in Muffle furnace.
8. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In the modification biological charcoal sorbing material prepared using step (1) adsorbs the phosphorus in waste water, by modification biological charcoal sorbing material
It is placed in certain density solution containing phosphate, at a certain temperature, by different rotating speeds, vibration 12-72h to adsorption equilibrium is filtered, surveyed
Determine the content of phosphorus in filtrate, phosphorus adsorption capacity is calculated using following methods：
Wherein, Y is phosphorus adsorption capacity, CoAnd CeRespectively phosphorus solution is initial and equilibrium concentration (mg L-1), V is the volume of phosphorus solution
(L), M is modification biological charcoal sorbing material use quality (g).
9. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In, initial phosphorus concentration is 250-500mg/L in phosphorus solution in step (2), and modification biological charcoal sorbing material quality is 0.1-0.3g,
The temperature used during modification biological charcoal sorbing material Phosphate Sorption for 15-60 DEG C, initial pH be 4-8, rotating speed is 60-120rpm, is changed
Property charcoal sorbing material granular size be 150-425 μm.
10. a kind of modification biological charcoal according to claim 1 adsorbs the response surface optimization method of Phosphorus From Wastewater, its feature exists
In the dominant factor described in step (3) is pyrolysis temperature, initial phosphorus concentration and adsorbent mass.
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