CN116067846A - Method for testing mechanical strength of aerobic granular sludge - Google Patents
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- 230000036962 time dependent Effects 0.000 claims abstract description 7
- 238000010586 diagram Methods 0.000 claims abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical group O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 5
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
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- CZMRCDWAGMRECN-UGDNZRGBSA-N Sucrose Chemical compound O[C@H]1[C@H](O)[C@@H](CO)O[C@@]1(CO)O[C@@H]1[C@H](O)[C@@H](O)[C@H](O)[C@@H](CO)O1 CZMRCDWAGMRECN-UGDNZRGBSA-N 0.000 description 1
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- G—PHYSICS
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
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Abstract
The invention discloses a method for testing the mechanical strength of aerobic granular sludge, which comprises the following steps: shearing aerobic granular sludge samples at different rotating speeds by using a laser particle size analyzer, and removing points with larger deviation by using a Dv10/50/90 time-dependent change chart; drawing a particle size distribution change chart under the action time of equal intervals; analysis and extraction of the rate of change of peak area and the like by software
Or the variation delta S information, drawing the action time as the abscissa,
or DeltaS is a scatter diagram with an ordinate, a curve is fitted, and the mechanical strength is characterized by quantification of the curve. Wherein, the smaller the change rate (or the change amount) of the peak area, the better the mechanical strength of the aerobic granular sludge is.The invention can realize the quantitative characterization and the standardized test of the mechanical strength of the aerobic granular sludge simply and accurately, forms a standardized data system, is beneficial to the comparison of the mechanical strength of the aerobic granular sludge formed by culturing different reactors, and provides a beneficial reference for further improving the stable operation of the reactors.
Description
Technical Field
The invention belongs to the technical field of biological wastewater treatment, and particularly relates to a method for testing the mechanical strength of aerobic granular sludge.
Background
The aerobic granular sludge (Aerobic Granular Sludge, AGS) is a granular activated sludge formed by self-agglomeration of microorganisms under aerobic conditions. Compared with the traditional activated sludge process, the AGS technology has the characteristics of high biomass accumulation, good sedimentation performance, pollution load impact resistance, small occupied area and the like.
Heretofore, aerobic granular sludge bioreactors include Membrane Bioreactors (MBR), sequencing Batch Reactors (SBR), and the like. However, the success of these bioreactor designs is related to their ability to form dense particles and maintain high biomass. The close cell packing in the particle aggregates optimizes the interplanar exchange of metabolites, thereby increasing overall activity.
However, from the reactor operating conditions, too high/low Organic Loading (OLR) and too high hydrodynamic conditions negatively affect the particles, possibly leading to cracking and dispersion, a significant reduction of biomass, and eventually a deterioration or even failure of the system. From the operation time, AGS is easily disintegrated after long-term operation. Therefore, maintaining the stability of AGS is critical for the stable operation of the reactor, while its mechanical properties are important indicators for characterizing its stability. In general, the mechanical properties of AGS are divided into compression and shear properties. The existing compressive property testing method is a measuring device and a measuring method for the elastic modulus of granular sludge, which are disclosed in Chinese patent CN 104062224A. The method for testing the shearing resistance comprises an integrity coefficient method (a vibrating screen is adopted and is judged by measuring the ratio of the solid mass in supernatant to the total weight of aerobic granular sludge), a instability coefficient method (an ultrasonic instrument is adopted, samples collected at equal intervals are subjected to absorbance value test at the wavelength of 600nm, and the slope of a fitted curve is the instability coefficient) and the like. Therefore, the existing test method has the advantage of rapid measurement, but the collected sample needs to be poured back in time in the test to prevent the volume change from influencing the experimental result, so that the establishment of a method for simultaneously satisfying the simple and accurate measurement of the mechanical strength is particularly important.
Disclosure of Invention
The invention provides a method for testing the mechanical strength of the aerobic granular sludge, which can realize the quantitative characterization and the standardized test of the mechanical strength of the aerobic granular sludge simply, conveniently and accurately.
In order to solve the technical problems, the invention adopts the following technical scheme: a method for testing the mechanical strength of aerobic granular sludge, comprising the following steps:
s1, shearing aerobic granular sludge samples at different rotating speeds by using a laser particle size analyzer, and removing points with larger deviation by using a Dv10/50/90 time-dependent change chart;
s2, drawing a particle size distribution change chart under the action time t with equal intervals;
s3, analyzing and extracting the peak area change rate by utilizing software in the step S2
Or information of the variation DeltaS, and drawing the peak area variation rate about the action time as the abscissa>
Or a scatter diagram with the variation delta S as an ordinate, fitting a curve, and quantitatively representing the mechanical strength of the aerobic granular sludge through the curve; the smaller the peak area change rate or the change amount is, the smaller the particle diameter change of the particles in the shearing process is, and the better the mechanical strength of the aerobic granular sludge is. />
Wherein S is the area of a region surrounded by the particle size distribution and the x axis, namely the peak area; t is the duration of action of the particle size distribution test.
According to the testing method provided by the invention, the shear resistance is used for representing the mechanical properties of the AGS, the mechanical strength of the aerobic granular sludge is quantitatively represented through the change rate or the change quantity of the particle size distribution peak area and the like, the mechanical strength comparison of the aerobic granular sludge formed by culturing different reactors is facilitated, the basis is provided for establishing the response mechanism of the reactor operation elements and the mechanical strength of the granules, and the optimal scheme is provided for culturing the aerobic granular sludge with good strength, so that the testing method has important practical significance and economic value.
Wherein, the aerobic granular sludge is not limited by the bioreactor for culture; the mechanical strength of the aerobic granular sludge may also be referred to as shear resistance, structural stability or mechanical stability.
Further, in the step S3, the peak height change amount Δh or the change rate can be used
Characterizing the mechanical strength of the aerobic granular sludge; where h is the shortest distance between the x-axis and the peak top point, i.e., the peak height.
Further, the change amount Δd or the change rate of the peak apex can be used
And (3) representing the mechanical strength of the aerobic granular sludge, wherein d is the distance between two adjacent peak top points.
Further, the mechanical strength of the aerobic granular sludge can be characterized by a limiting peak particle size R, wherein R is the peak particle size, and the limiting peak particle size is particularly shown here and is obtained by a Dv10/50/90 time-dependent graph.
Further, in step S1, the selected aerobic granular sludge is generally an existing sample, suspended flocculent sludge is removed through a screen, and then a vortex mixer is used for uniform mixing, so as to ensure the accuracy of the test.
Further, in the step S2, the abscissa is the particle size of the aerobic granular sludge, and the ordinate is the capacity ratio.
Further, in the step S1, the particle size of the aerobic granular sludge before shearing is 200-3000 μm. Preferably 500 μm to 2500. Mu.m.
Further, in the step S1, the rotation speed omega is 500r/min-3500r/min.
Further, in the step S1, the action time is 15-90 min; and testing at equal intervals for 1.5-5 min. The preferable action time is 30 min-60 min; the test is carried out at equal intervals of 1.5min to 2.5 min.
Further, in the step S1, the laser particle size analyzer is Malvern MS3000, and the parameters are set as follows: the dispersing agent is deionized water; the refractive index is 1-2; the absorptivity is 0.05-0.2; the shading degree is 5-50.
Further, the test result needs to meet that RSD values of Dv10, dv50 and Dv90 are respectively smaller than 10, 6 and 10, and fitting weight is smaller than 2.5%; where Dv10 means that 10% of the sample particle size is smaller than this value, dv50 means that 50% of the sample particle size is smaller than this value, and Dv90 means that 90% of the sample particle size is smaller than this value.
Compared with the prior art, the beneficial effects are that:
1. the invention adopts a laser particle size analyzer which is a commonly used instrument for measuring particle size, and has the characteristics of rapidness, accuracy, high degree of automation, less influence by concentration and external factors and the like.
2. According to the testing method, the mechanical strength of the aerobic granular sludge is represented by the equivalent of the variation/variation rate of the peak area or peak height, and the granules generated by different bioreactors are tested and compared at different rotating speeds, so that the testing method has universality and practicability. The invention can realize the quantitative characterization and the standardized test of the mechanical strength of the aerobic granular sludge simply and accurately, forms a standardized data system, is beneficial to the comparison of the mechanical strength of the aerobic granular sludge formed by culturing different reactors, and provides a beneficial reference for further improving the stable operation of the reactors.
Drawings
FIG. 1 is a flow chart of the method for testing the mechanical strength of aerobic granular sludge.
FIG. 2 is a graph showing the change in particle size distribution at equal intervals in the examples.
FIG. 3 is a graph of a fit of the peak area change rate over time for the examples.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are only some, but not all embodiments of the invention. The invention is described in one of its examples in connection with the following detailed description. Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to be limiting of the present patent; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
In the description of the present invention, it should be understood that, if there is an azimuth or positional relationship indicated by terms such as "upper", "lower", "left", "right", etc., based on the azimuth or positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but it is not indicated or implied that the apparatus or element referred to must have a specific azimuth, be constructed and operated in a specific azimuth, and thus terms describing the positional relationship in the drawings are merely illustrative and should not be construed as limitations of the present patent, and specific meanings of the terms described above may be understood by those skilled in the art according to specific circumstances. In addition, if there is a description of "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" as it appears throughout is meant to include three side-by-side schemes, for example, "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B meet at the same time.
Example 1:
as shown in fig. 1, a method for testing the mechanical strength of aerobic granular sludge comprises the following steps:
s1, shearing aerobic granular sludge samples at different rotating speeds by using a laser particle size analyzer, and removing points with larger deviation by using a Dv10/50/90 time-dependent change chart;
s2, drawing a particle size distribution change chart under the action time t with equal intervals;
s3, analyzing and extracting peak areas by utilizing software in the step S2Rate of change
Or information of the variation DeltaS, and drawing the peak area variation rate about the action time as the abscissa>
Or a scatter diagram with the variation delta S as an ordinate, fitting a curve, and quantitatively representing the mechanical strength of the aerobic granular sludge through the curve; the smaller the peak area change rate or the change amount is, the smaller the particle diameter change of the particles in the shearing process is, and the better the mechanical strength of the aerobic granular sludge is.
Wherein S is the area of a region surrounded by the particle size distribution and the x axis, namely the peak area; t is the duration of action of the particle size distribution test.
According to the testing method provided by the invention, the shear resistance is used for representing the mechanical properties of the AGS, the mechanical strength of the aerobic granular sludge is quantitatively represented through the change rate or the change quantity of the particle size distribution peak area and the like, the mechanical strength comparison of the aerobic granular sludge formed by culturing different reactors is facilitated, the basis is provided for establishing the response mechanism of the reactor operation elements and the mechanical strength of the granules, and the optimal scheme is provided for culturing the aerobic granular sludge with good strength, so that the testing method has important practical significance and economic value.
Wherein, the aerobic granular sludge is not limited by the bioreactor for culture; the mechanical strength of the aerobic granular sludge may also be referred to as shear resistance, structural stability or mechanical stability.
In step S3, the peak height change Δh or the change rate can also be used
Characterizing the mechanical strength of the aerobic granular sludge; where h is the shortest distance between the x-axis and the peak top point, i.e., the peak height.
In addition, the variation Δd or the variation rate of the peak apex can be used
Characterization of aerobic granulesThe mechanical strength of the sludge, wherein d is the distance between two adjacent peak top points. The mechanical strength of the aerobic granular sludge can also be characterized by a limiting peak particle size R, wherein R is the peak particle size, and the limiting peak particle size is particularly shown here and is obtained by a Dv10/50/90 time-dependent graph.
Specifically, in step S1, the selected aerobic granular sludge is generally an existing sample, suspended flocculent sludge is removed through a screen, and then a vortex mixer is used for uniform mixing, so as to ensure the accuracy of the test. In the step S2, the abscissa is the particle size of the aerobic granular sludge, and the ordinate is the capacity ratio.
Wherein in the step S1, the grain diameter of the aerobic granular sludge before shearing is 200-3000 mu m. Preferably 500 μm to 2500. Mu.m. In the step S1, the rotating speed omega is 500r/min-3500r/min. In the step S1, the action time is 15-90 min; and testing at equal intervals for 1.5-5 min. The preferable action time is 30 min-60 min; the test is carried out at equal intervals of 1.5min to 2.5 min. In the step S1, the laser particle size analyzer is Malvern MS3000, and the parameters are set as follows: the dispersing agent is deionized water; the refractive index is 1-2; the absorptivity is 0.05-0.2; the shading degree is 5-50.
Specifically, the test result needs to meet that RSD values of Dv10, dv50 and Dv90 are respectively less than 10, 6 and 10, and fitting weight is less than 2.5%; where Dv10 means that 10% of the sample particle size is smaller than this value, dv50 means that 50% of the sample particle size is smaller than this value, and Dv90 means that 90% of the sample particle size is smaller than this value.
According to the testing method, the mechanical strength of the aerobic granular sludge is represented by the equivalent of the variation/variation rate of the peak area or peak height, and the granules generated by different bioreactors are tested and compared at different rotating speeds, so that the testing method has universality and practicability. The invention can realize the quantitative characterization and the standardized test of the mechanical strength of the aerobic granular sludge simply and accurately, forms a standardized data system, is beneficial to the comparison of the mechanical strength of the aerobic granular sludge formed by culturing different reactors, and provides a beneficial reference for further improving the stable operation of the reactors.
Example 2
The present invention will be described in further detail with reference to the following specific examples and drawings, but the embodiments of the present invention are not limited thereto. The apparatus employed in the present invention is conventional in the art unless otherwise specified.
And (3) testing the mechanical strength of the aerobic granular sludge with different particle sizes (large and small) in the reactor 1 at the rotating speed of 2250 r/min.
A method for testing the mechanical strength of aerobic granular sludge, comprising the following steps:
s1, shearing aerobic granular sludge samples at different rotating speeds by using a laser particle size analyzer, and removing points with larger deviation by using a Dv10/50/90 time-dependent change chart;
s2, drawing a particle size distribution change chart under the action time t with equal intervals, wherein the abscissa is the particle size (mum) of particles, and the ordinate is the capacity ratio (%);
s3, analyzing and extracting the peak area change rate by utilizing software in the step S2
Or information of the variation DeltaS, and drawing the peak area variation rate about the action time as the abscissa>
Or a scatter diagram with the variation delta S as an ordinate, fitting a curve, and quantitatively representing the mechanical strength of the aerobic granular sludge through the curve; the smaller the peak area change rate or the change amount is, the smaller the particle diameter change of the particles in the shearing process is, and the better the mechanical strength of the aerobic granular sludge is.
Wherein S is the area of a region surrounded by the particle size distribution and the x axis, namely the peak area; t is the duration of action of the particle size distribution test.
In the embodiment, in the step S1, aerobic granular sludge comes from a rectangular membrane bioreactor 1 (35 multiplied by 25 multiplied by 30 cm), and a plastic net is adopted to separate an aerobic zone and a membrane assembly zone with a volume ratio of 2:1; the water inlet is artificial synthetic wastewater composed of sucrose (392.7 mg/L) and other nutrient substances; the cultured particles take filamentous microorganisms as frameworks, are ellipsoidal, have smooth surfaces and are mainly brown; the sample is divided into two different particle sizes; setting the rotating speed to 2250r/min, setting the acting time to 50min, and testing at equal intervals for 2 min; the shading degree of the laser particle size analyzer is set to be 10-20, the test result is shown in fig. 2, and a fitting curve chart of the change rate of the peak area, which is obtained by analysis in the step S3, along with the change of the action time is shown in fig. 3-a;
comparing the slope of the curve fitted with the above, it can be seen that the slope of the curve corresponding to the small particle size is larger than that of the large particle size, which means that the mechanical strength of the small particle size AGS is weaker.
Example 3
Mechanical Strength test of aerobic granular sludge in reactor 2 at 2250r/min
This embodiment differs from embodiment 2 in that: the AGS used is different, the particles used in the embodiment come from a reactor 2 (4750 multiplied by 2500 multiplied by 3580 mm), and consist of an aeration area and a mixing area, the inlet water is domestic sewage, and the cultured particles mainly take calcium ions as a framework, and have lighter internal color and darker external color; the experimental test of different gradient particle sizes is not set, the action time is set to be 32min, the test result is shown in figure 2, and the fitting curve graph of the change rate of the peak area, which is obtained by analysis in step S3, along with the change of the action time is shown in figure 3-a; by comparison with the slope of the fitted curve of example 1, it can be seen that the AGS formed in reactor 2 has the smallest slope of the corresponding curve in a shorter time of action, indicating that the formed AGS has the strongest mechanical strength.
Example 4
Mechanical strength test of aerobic granular sludge in reactor 1 at rotational speeds of 1500, 2250, 3000r/min
This embodiment differs from embodiment 2 in that: setting different gradient rotating speed experimental tests, but not setting different gradient particle size experimental tests, wherein the test result is shown in fig. 2, and the fitting curve graph of the peak area change rate obtained by analysis in step S3 along with the change of the action time is shown in fig. 3-b; by comparing the slopes of the fitted curves, it can be seen that the slope of the fitted curve increases with increasing rotational speed of the AGS formed by the reactor 1, indicating that the mechanical strength of the AGS decreases with increasing rotational speed within the range of 1500-3000 r/min.
It is to be understood that the above examples of the present invention are provided by way of illustration only and not by way of limitation of the embodiments of the present invention. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. Any modification, equivalent replacement, improvement, etc. which come within the spirit and principles of the invention are desired to be protected by the following claims.
Claims (10)
1. A method for testing the mechanical strength of aerobic granular sludge, which is characterized by comprising the following steps:
s1, shearing aerobic granular sludge samples at different rotating speeds by using a laser particle size analyzer, and removing points with larger deviation by using a Dv10/50/90 time-dependent change chart;
s2, drawing a particle size distribution change chart under the action time t with equal intervals;
s3, analyzing and extracting the peak area change rate by utilizing software in the step S2
Or information of the variation DeltaS, and drawing the peak area variation rate about the action time as the abscissa>
Or a scatter diagram with the variation delta S as an ordinate, fitting a curve, and quantitatively representing the mechanical strength of the aerobic granular sludge through the curve; the smaller the peak area change rate or the change amount is, the better the mechanical strength of the aerobic granular sludge is;
wherein S is the area of a region surrounded by the particle size distribution and the x axis, namely the peak area; t is the duration of action of the particle size distribution test.
2. The method for testing mechanical strength of aerobic granular sludge according to claim 1, wherein in the step S3, the change amount Δh or the change rate of the peak height can be used
Characterizing the mechanical strength of the aerobic granular sludge; where h is the shortest distance between the x-axis and the peak top point, i.e., the peak height.
3. The method for testing the mechanical strength of aerobic granular sludge according to claim 2, wherein the change amount Δd or the change rate of the peak-to-peak point can be used
And (3) representing the mechanical strength of the aerobic granular sludge, wherein d is the distance between two adjacent peak top points.
4. A method for testing the mechanical strength of aerobic granular sludge according to claim 3, characterized in that the mechanical strength of the aerobic granular sludge can also be characterized by a limiting peak particle size R, wherein R is the peak particle size, here particularly the limiting peak particle size, which is obtained by Dv10/50/90 as a function of time.
5. The method according to claim 4, wherein in the step S2, the abscissa represents the particle size of the aerobic granular sludge and the ordinate represents the capacity ratio.
6. The method according to any one of claims 1 to 5, wherein in the step S1, the particle size of the aerobic granular sludge before shearing is 200 μm to 3000 μm.
7. The method according to any one of claims 1 to 5, wherein in the step S1, the rotation speed ω is 500r/min to 3500r/min.
8. The method according to any one of claims 1 to 5, wherein in the step S1, the action time is 15min to 90min; and testing at equal intervals for 1.5-5 min.
9. The method according to any one of claims 1 to 5, wherein in the step S1, the laser particle size analyzer is Malvern MS3000, and the parameters are set as follows: the dispersing agent is deionized water; the refractive index is 1-2; the absorptivity is 0.05-0.2; the shading degree is 5-50.
10. The method for testing the mechanical strength of aerobic granular sludge according to claim 9,
the test result needs to meet that RSD values of Dv10, dv50 and Dv90 are respectively smaller than 10, 6 and 10, and fitting weight is smaller than 2.5%; where Dv10 means that 10% of the sample particle size is smaller than this value, dv50 means that 50% of the sample particle size is smaller than this value, and Dv90 means that 90% of the sample particle size is smaller than this value.
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| CN113479998A (en) * | 2021-04-27 | 2021-10-08 | 合肥工业大学 | Comprehensive evaluation method for aerobic sludge granulation degree |
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