CN111363776A - Method for determining influence of FNA on nitrite oxidizing bacteria by using mathematical model - Google Patents

Method for determining influence of FNA on nitrite oxidizing bacteria by using mathematical model Download PDF

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CN111363776A
CN111363776A CN202010220851.2A CN202010220851A CN111363776A CN 111363776 A CN111363776 A CN 111363776A CN 202010220851 A CN202010220851 A CN 202010220851A CN 111363776 A CN111363776 A CN 111363776A
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fna
nitrosobacteria
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刘兵
李一凡
陈飞勇
邵媛媛
吴金柱
李冰洁
赵硕
田宇
王静
吴小东
赵振东
谭刚
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Abstract

The invention relates to a method for determining the influence of FNA on nitrite oxidizing bacteria by using a mathematical model, which is characterized in that the specific oxygen consumption rate (SOUR) under different Free Nitrite (FNA) concentration conditions is determined, and the kinetic parameter value of the influence of the Free Nitrite (FNA) on the nitrite oxidizing bacteria is determined by establishing a model equation for simulation. According to the invention, the influence of the Free Nitrite (FNA) on the nitrosobacteria is quantitatively researched by using a mathematical model, and the influence degree of the Free Nitrite (FNA) on the nitrosobacteria can be known by determining the model parameters of the influence of the Free Nitrite (FNA) on the nitrosobacteria, so that the growth environment of the nitrosobacteria is better optimized, and the activity of the nitrosobacteria and the sewage denitrification effect are improved. Provide theory and data support for short distance nitration, when perfecting nitrosation bacterium mathematical model, also provide basic data for realizing wisdom water affairs.

Description

Method for determining influence of FNA on nitrite oxidizing bacteria by using mathematical model
Technical Field
The invention belongs to the field of environmental engineering, relates to sewage treatment, and particularly relates to a method for determining the influence of Free Nitrite (FNA) on nitrite oxidizing bacteria by using a mathematical model.
Background
In recent years, with the development of economic society and the improvement of industrialization degree, the ecological environment is seriously influenced by the large amount of discharged sewage. The over-standard nitrogen and phosphorus contents are the main reasons for water eutrophication, the water eutrophication seriously influences the water area environment and the water function, algae and plankton grow and breed rapidly, so that the dissolved oxygen in the water is reduced, and after a large amount of aquatic organisms die, anaerobic decomposition is carried out to generate COD and H2S、NH3And the like, so that the water body becomes black and smelly. As one of the main pollution factors, the removal of nitrogen from polluted water is an important issue in the field of sewage treatment.
Biological sewage treatment is the main mode of sewage treatment at present, and the core technology for controlling the biological sewage treatment is the growth dynamics of microorganisms. Since the last century, many studies on the dynamics of wastewater treatment microorganisms have been made abroad, and then a microorganism mathematical model has been established and gradually developed, so far, a wastewater treatment activated sludge mathematical model represented by an ASM series model has been formed.
The viability of the nitrifying bacteria is affected by the conditions of Sludge Retention Time (SRT), temperature, pH and concentration of Free Nitrous Acid (FNA). The influence of each environmental restriction factor can be integrated by utilizing a mathematical model, and an optimized growth condition is determined, so that the activated sludge treatment efficiency and the sewage treatment effect can be improved.
By measuring model parameters of the influence of Free Nitrous Acid (FNA) on the nitrosobacteria, a mathematical model of the nitrosobacteria can be perfected, and a better growth environment and denitrification efficiency can be provided for the nitrosobacteria based on the parameters. Meanwhile, basic data are provided for realizing intelligent water affairs.
At present, the influence of Free Nitrous Acid (FNA) on nitrosobacteria is a research hotspot in the field of sewage treatment, but a method using a mathematical model is rarely used for research.
Disclosure of Invention
The invention mainly aims to provide a method for determining the influence of Free Nitrite (FNA) on nitrite oxidizing bacteria by using a mathematical model, determine model parameters of the influence of the Free Nitrite (FNA) on nitrite oxidizing bacteria, and perfect the mathematical model of the nitrite oxidizing bacteria, thereby improving the activity of the nitrite oxidizing bacteria and the sewage denitrification effect.
In order to achieve the purpose, the invention adopts the technical scheme that: a method for determining the effect of FNA on nitrite oxidizing bacteria by using a mathematical model, firstly, establishing a model equation: setting a nitrite concentration gradient to carry out batch experiments, and calculating the concentration of free nitrous acid FNA according to the nitrite concentration of the activated sludge of the batch experiments; determining the aerobic rate OUR of the nitrosobacteria under the condition of different concentrations of free nitrous acid FNA; calculating the specific oxygen consumption rate SOUR of the nitrosobacteria according to the suspended solid concentration SS and OUR of the activated sludge; establishing a model equation of the influence of the concentration of the FNA free nitrous acid on the nitrosobacteria; and then, simulating the experimental data by using the established model equation to determine the kinetic parameters of the experimental data.
The invention relates to a method for determining the influence of FNA on nitrite oxidizing bacteria by using a mathematical model, which comprises the following steps:
(1) measuring suspended solids concentration (SS) of the activated sludge taken0)；
(2) Setting a nitrous acid concentration gradient to carry out batch experiments on nitrosobacteria, wherein the experiment temperature is controlled to be 35 +/-1 ℃, and the pH value is controlled to be 7.3 +/-0.1;
(3) calculating the concentration of Free Nitrous Acid (FNA) according to the nitrite concentration, the temperature and the pH of the batch experiment;
(4) determining the aerobic rate (OUR) of the nitrosobacteria under the condition of different Free Nitrous Acid (FNA) concentrations;
(5) calculating the specific oxygen consumption rate (SOUR) of the nitrosobacteria according to SS and OUR of the activated sludge in the BOD bottles during batch experiments;
(6) establishing a model equation of the influence of the concentration of Free Nitrous Acid (FNA) on nitrosobacteria;
(7) and simulating the experimental data by using the established model equation to determine the kinetic parameters of the experimental data.
In the step (3), the calculation formula of the FNA concentration of the free nitrous acid is as follows:
Figure BDA0002426003300000021
in the formula: NO2 -: nitrite concentration of batch experiment, mg-N/L; pH: pH of batch experiments; t: the temperature in centigrade, DEG C, of the batch experiment; and calculating the concentration gradient of nitrite corresponding to the concentration of Free Nitrous Acid (FNA) in batch experiments according to a formula.
In the step (4), the method for determining the aerobic rate OUR of the nitrosobacteria comprises the following steps: measuring Dissolved Oxygen (DO) in BOD, recording data every 30s, measuring at least 12 sets of data, and making a slope equation using Excel such that R2The gradient is equal to or more than 99 percent, and the slope is the aerobic rate (OUR) of the nitrosobacteria under the nitrite concentration condition.
In the step (5), the SOUR calculation equation is
Figure BDA0002426003300000022
Calculating SS used by SOUR as SS of activated sludge in BOD bottles in batch experiments according to the data SS measured in the step (1)0And (6) calculating.
In the step (6), the model equation is a model equation for establishing the influence of Free Nitrous Acid (FNA) on the nitrosobacteria based on an Eckenfelder equation and a Monod equation, and the growth rate of the nitrosobacteria under the condition of neglecting alkalinity limitation can be represented by the following formula:
Figure BDA0002426003300000031
in the formula: μ: specific growth rate of nitrosobacteria, d-1；μmax: maximum specific growth rate of nitrosobacteria, d-1；SFNA: nitrite concentration, mg-N/L; kFNA: the semi-saturation rate of the nitrosation bacteria is mg-N/L; kI: the matrix limiting constant, mg-N/L; in the model equation, SOUR and mu have a direct proportion relation, and K is usedAExpressing this relationship as a parameter yields the following expression:
Figure BDA0002426003300000032
wherein: SOUR: the specific oxygen consumption rate of the nitrosation bacteria is mg-O/g/h; kA: specific oxygen consumption rate parameter of nitrosobacteria.
And (7) simulating experimental data by using a model equation to determine a kinetic parameter value K of influence of Free Nitrous Acid (FNA) on nitrosobacteriaFNA、KI。
The invention has the beneficial effects that: the invention can use a mathematical model method to carry out quantitative research on the influence of the Free Nitrous Acid (FNA) on the nitrosobacteria, and the degree of the influence of the Free Nitrous Acid (FNA) on the nitrosobacteria can be known by determining the model parameters of the influence of the Free Nitrous Acid (FNA) on the nitrosobacteria, thereby improving the activity of the nitrosobacteria and the sewage denitrification effect. The invention not only improves the nitrosation bacteria mathematical model, but also provides basic data for realizing intelligent water affairs.
Compared with the prior art, the invention has the following advantages:
(1) the method uses a mathematical model method to determine the influence of Free Nitrous Acid (FNA) on nitrosobacteria, is more rigorous and accurate compared with other traditional methods, and realizes quantitative research by using a model equation. The mathematical model has the advantages that the influence factors of all aspects can be comprehensively planned, and an optimized environmental condition is sought, so that the sewage treatment effect is improved. The method can determine the concentration factor parameters of Free Nitrous Acid (FNA) of the nitrosobacteria and perfect the mathematical model of the nitrosobacteria, thereby improving the activity of the nitrosobacteria and the sewage denitrification effect.
(2) The determination method is simple and easy to operate, has high repeatability and is convenient to popularize and use, so that the development and innovation of a mathematical model method in the field of sewage treatment are promoted.
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FIG. 1 is a schematic view of a batch experimental apparatus according to the present invention; in fig. 1: 1. a water bath magnetic stirrer; 2. a magnetic rotor; 3. BOD bottle; 4. a Dissolved Oxygen (DO) measurement probe; 5. dissolved Oxygen (DO) meter.
FIG. 2 is a simulated plot of Free Nitrous Acid (FNA) concentration versus specific oxygen consumption rate (SOUR) for nitrosobacteria of example 1.
FIG. 3 is a simulated plot of Free Nitrous Acid (FNA) concentration versus specific oxygen consumption rate (SOUR) for nitrosobacteria of example 2.
Detailed Description
The invention is further described with reference to the following figures and specific embodiments. The following examples employ the batch experimental setup of FIG. 1, which is conventional in the art unless otherwise specified, and the reagents and equipment are commercially available without further specification.
Example 1, a method of using a mathematical model to determine the effect of Free Nitrous Acid (FNA) on nitrous acid oxidising bacteria, the steps of which are as follows:
(1) taking 1L of activated sludge from the continuous culture reactor under the condition that the Sludge Retention Time (SRT) is 10d, carrying out centrifugal pretreatment, concentrating to 200ml, and measuring Suspended Solids (SS)0) It was 2.407 g/L. The centrifugal pretreatment is to eliminate interference of original matrix and salt, and is usedThe activated sludge is centrifugally cleaned by distilled water for more than three times. Determination of suspended solids concentration (SS)0) The method comprises the steps of drying a certain volume of activated sludge in an oven at 105 ℃ for 8 hours, removing water, weighing and calculating the volume concentration of the activated sludge.
(2) Setting the nitrite concentration in batch experiment to be 1mg-N/L, 5mg-N/L, 10mg-N/L, 20mg-N/L, 40mg-N/L, 50mg-N/L, 80mg-N/L, 100mg-N/L respectively, placing 15ml of activated sludge in a 100ml BOD bottle, controlling the pH to be 7.3 +/-0.1 by using phosphoric acid buffer solution, controlling the temperature to be 35 +/-1 ℃ by using a water bath heating method, and adding sodium nitrite (NaNO) into the activated sludge2) And (4) solution, forming a set concentration gradient. The phosphate buffer solution used for pH control was prepared by mixing a potassium dihydrogen phosphate solution (1/15mol) and a disodium hydrogen phosphate solution (1/15mol) at a ratio of 2:8, and adjusting the pH to 7.3. + -. 0.1.
(3) Calculating formula according to concentration of Free Nitrous Acid (FNA):
Figure BDA0002426003300000041
Figure BDA0002426003300000042
the calculated concentration gradient of nitrite corresponding to the concentration of Free Nitrous Acid (FNA) in batch experiments is 0.0003mg-N/L, 0.0015mg-N/L, 0.0029mg-N/L, 0.0059mg-N/L, 0.0118mg-N/L, 0.0147mg-N/L, 0.0236mg-N/L and 0.0294mg-N/L respectively.
(4) Dissolved Oxygen (DO) in BOD is determined and the dissolved oxygen-time slope equation is made using excel such that R2More than or equal to 99 percent, and obtaining the aerobic rate (OUR) of the nitrosobacteria under the condition of the nitrite concentration. See table 1.
TABLE 1
Figure BDA0002426003300000051
(5) According to the suspended solids concentration (SS) in step (1)0)2.407g/L, the concentration of Suspended Solids (SS) in the BOD flasks of the batch experiment was calculated to be 0.361 g/L. Further using the equation
Figure BDA0002426003300000052
The specific oxygen consumption rate SOUR of the nitrosobacteria under each Free Nitrous Acid (FNA) concentration condition was calculated.
(6) Making a scatter plot of Free Nitrous Acid (FNA) concentration versus specific oxygen consumption rate (SOUR) of nitrosobacteria and using a model equation
Figure BDA0002426003300000053
The simulation was performed and the effect of the simulation is shown in figure 2.
(7) Equation μ of the above modelmax＝0.6d-1Under the condition of (1), obtaining a kinetic parameter value K of the influence of Free Nitrous Acid (FNA) on the nitrosobacteriaFNA＝0.0005mg-N/L、KI＝0.0105mg-N/L。
Example 2, a method of using a mathematical model to determine the effect of Free Nitrous Acid (FNA) on nitrous acid oxidising bacteria, the same as in example 1, except that:
activated sludge with Sludge Retention Time (SRT) of 5d is taken from the reactor in the step (1) for measuring SS0And calculating the concentration of Suspended Solids (SS) in the BOD bottles of batch experiments to be 0.061g/L, and adjusting the concentration of a group of nitrite to be 8mg-N/L for better realizing the fitting of data, namely adjusting the concentration of FNA to be 0.0024mg-N/L from 0.0015 mg-N/L. Dissolved Oxygen (DO) in BOD is determined and the dissolved oxygen-time slope equation is made using excel such that R2More than or equal to 99 percent, and obtaining the aerobic rate (OUR) of the nitrosobacteria under the condition of the nitrite concentration. See table 2.
TABLE 2
Figure BDA0002426003300000061
Then, the specific oxygen consumption rate SOUR of the nitrosobacteria under each Free Nitrous Acid (FNA) concentration condition was calculated therefrom. A scatter plot of Free Nitrous Acid (FNA) concentration versus specific oxygen consumption rate (source) of nitrosobacteria was made and simulated using a model equation, the simulation effect being shown in figure 3. Mu.smax＝0.6d-1Under the condition of (1), obtaining a kinetic parameter value K of the influence of Free Nitrous Acid (FNA) on the nitrosobacteriaFNA＝0.0004mg-N/L、KI＝0.0024mg-N/L。
The dynamics parameters of the FNA measured by the invention on the nitrosation bacteria can be brought into an Activated Sludge Model (ASM), and the GPS-X software is used for simulating and predicting the actual sewage treatment process, so that corresponding process design and adjustment are made, and higher sewage denitrification efficiency is obtained and the treatment cost is reduced.

Claims (8)

1. A method of determining the effect of FNA on nitrite oxidizing bacteria using a mathematical model, wherein first, a model equation is established: setting a nitrite concentration gradient to carry out batch experiments, and calculating the concentration of free nitrous acid FNA according to the nitrite concentration of the activated sludge of the batch experiments; determining the aerobic rate OUR of the nitrosobacteria under the condition of different concentrations of free nitrous acid FNA; calculating the specific oxygen consumption rate SOUR of the nitrosobacteria according to the suspended solid concentration SS and OUR of the activated sludge; establishing a model equation of the influence of the concentration of the FNA free nitrous acid on the nitrosobacteria; and then, simulating the experimental data by using the established model equation to determine the kinetic parameters of the experimental data.
2. A method of determining the effect of FNA on nitrite oxidizing bacteria using a mathematical model as claimed in claim 1, wherein the specific method is:
(1) determination of suspended solids concentration SS of the activated sludge taken0；
(2) Setting a nitrous acid concentration gradient to carry out batch experiments on nitrosobacteria, wherein the experiment temperature is controlled to be 35 +/-1 ℃, and the pH value is controlled to be 7.3 +/-0.1;
(3) calculating the FNA concentration of free nitrous acid according to the nitrite concentration, the temperature and the pH of batch experiments;
(4) determining the aerobic rate OUR of the nitrosobacteria under the condition of different concentrations of free nitrous acid FNA;
(5) calculating the specific oxygen consumption rate SOUR of the nitrosobacteria according to SS and OUR of the activated sludge in the BOD bottles during batch experiments;
(6) establishing a model equation of the influence of the concentration of the FNA free nitrous acid on the nitrosobacteria;
(7) and simulating the experimental data by using the established model equation to determine the kinetic parameters of the experimental data.
3. The method of using a mathematical model to determine the effect of FNA on nitrite oxidizing bacteria of claim 2, wherein: the calculation formula of the FNA concentration of the free nitrous acid is as follows:
Figure FDA0002426003290000011
in the formula: NO2 -: nitrite concentration of batch experiment, mg-N/L; pH: pH of batch experiments; t: the temperature in centigrade, DEG C, of the batch experiment; and calculating the concentration gradient of nitrite corresponding to the concentration of free nitrous acid FNA in batch experiments according to a formula.
4. The method of using a mathematical model to determine the effect of FNA on nitrite oxidizing bacteria of claim 2, wherein: in the step (4), the method for determining the aerobic rate OUR of the nitrosobacteria comprises the following steps: measuring dissolved oxygen DO in BOD, recording data every 30s, measuring at least 12 groups of data, and making slope equation by using Excel2More than or equal to 99 percent, and the slope of the nitrite is the aerobic rate OUR of the nitrosobacteria under the nitrite concentration condition.
5. The method of using a mathematical model to determine the effect of FNA on nitrite oxidizing bacteria of claim 2, wherein: in step (5), the SOUR calculation equation is
Figure FDA0002426003290000021
Calculating SS used by SOUR as SS of activated sludge in BOD bottles in batch experiments according to the data SS measured in the step (1)0And (6) calculating.
6. A method of determining the effect of FNA on nitrite oxidizing bacteria according to claim 5, wherein: in step (6), the model equation is based on the Eckenfelder equation and Monod's equationThe process establishes a model equation of the influence of the FNA free nitrous acid on the nitrosobacteria, and the growth rate of the nitrosobacteria under the condition of neglecting alkalinity limitation can be represented by the following formula:
Figure FDA0002426003290000022
in the formula: μ: specific growth rate of nitrosobacteria, d-1；μmax: maximum specific growth rate of nitrosobacteria, d-1；SFNA: nitrite concentration, mg-N/L; kFNA: the semi-saturation rate of the nitrosation bacteria is mg-N/L; kI: the matrix limiting constant, mg-N/L; in the model equation, SOUR and mu have a direct proportion relation, and K is usedAExpressing this relationship as a parameter yields the following expression:
Figure FDA0002426003290000023
wherein: SOUR: the specific oxygen consumption rate of the nitrosation bacteria is mg-O/g/h; kA: specific oxygen consumption rate parameter of nitrosobacteria.
7. A method of determining the effect of FNA on nitrite oxidizing bacteria according to claim 2 or 6, wherein: and (7) simulating experimental data by using a model equation to determine a parameter value K of the influence dynamics of the FNA to the nitrosobacteriaFNA、KI。
8. The method of using a mathematical model to determine the effect of FNA on nitrite oxidizing bacteria of claim 7, wherein: the parameter value KFNA、KIThe method is used for simulating and predicting the actual sewage treatment process by using GPS-X software in an Activated Sludge Model (ASM).
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112010427A (en) * 2020-09-08 2020-12-01 山东建筑大学 Construction method and application of two-step decay model of nitrite oxidizing bacteria

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112010427A (en) * 2020-09-08 2020-12-01 山东建筑大学 Construction method and application of two-step decay model of nitrite oxidizing bacteria

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