Calculation method for conversion rate and utilization rate of carbon source in continuous flow AOA process

Abstract

The invention relates to the technical field of sewage treatment, and discloses a method for calculating the conversion rate and the utilization rate of an internal carbon source in a continuous flow AOA process, which comprises the following steps: representing the internal carbon source in the AOA process by using PHA, calculating the PAO internal carbon source conversion rate and the GAO internal carbon source conversion rate in an anaerobic tank, and further calculating the total internal carbon source conversion rate PHA-CODintral-total (%) in the anaerobic tank; calculating the consumption delta PHAaer and the consumption rate PHAaer% of an internal carbon source in the aerobic tank by utilizing the MLVSS of the aerobic tank; calculating the utilization rate of the internal carbon source in the anoxic tank. The calculation formula parameters mostly consider the specific conditions of the biological tank and the factors involved by microorganisms, and the calculation method is utilized to reduce the measurement of the related indexes of the biochemical treatment tank, especially the PHA which is difficult to measure, so that the cost is saved, the measurement error is avoided, and the calculation result conforms to the actual production.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a method for calculating the carbon source conversion rate and utilization rate in a continuous flow AOA process. Background Technology

[0002] Traditional biological phosphorus and nitrogen removal processes have high requirements for the carbon source in the raw water. However, insufficient carbon source supply in the raw water often makes it difficult to meet the requirements for phosphorus and nitrogen removal efficiency. The AOA process, on the other hand, can operate under low C / N conditions, offering significant advantages over traditional processes. It not only reduces energy consumption and saves costs but also achieves a higher total nitrogen removal rate. The AOA process employs an anaerobic-aerobic-anoxic connection, placing the anoxic tank of the traditional A2O process downstream and eliminating nitrification liquor recirculation. It utilizes GAO bacteria and the internal carbon source stored in the anaerobic section for endogenous denitrification in the anoxic tank, simultaneously coupled with anaerobic ammonium oxidation. This synergistic effect of heterotrophic and autotrophic nitrogen removal enhances the system's nitrogen removal capacity.

[0003] However, as a new technology, the calculation method for the operating efficiency of the AOA process still has many shortcomings, especially the internal carbon source conversion efficiency and internal carbon source utilization efficiency, which are the most important parameters in the AOA process. Their calculation methods are still lacking. Therefore, a set of calculation methods is proposed, including the internal carbon source conversion rate in anaerobic conditions, the consumption rate in aerobic conditions, and the conversion rate in anoxic conditions, so as to realize the accounting and evaluation of the internal carbon source throughout the process and ensure the effectiveness of the process. Summary of the Invention

[0004] In order to solve at least one of the above-mentioned technical problems and develop an evaluation method that conforms to the AOA process, this application provides a set of calculation methods for carbon source conversion rate and utilization rate in continuous flow AOA process.

[0005] On the one hand, this application provides a method for calculating the carbon source conversion rate and utilization rate in a continuous flow AOA process, including the following steps: Calculate the COD content absorbed by microorganisms in the anaerobic tank. intra : Using PHA to represent the internal carbon source in the AOA process, calculate the PHA-COD conversion rate of the internal carbon source in the anaerobic tank. intra-PAO (%) and internal carbon source conversion rate of GAO PHA-COD intra-GAO (%) Carbon source conversion rate (PHA-COD) in PAO in anaerobic tank intra-PAO The formula for (%) is: Carbon source conversion rate (PHA-COD) in GAO in anaerobic tank intra-GAOThe formula for (%) is: in, This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L; This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L; COD i COD w1 COD ana COD concentrations at the inlet of the equalization tank, in the sludge returned from the secondary sedimentation tank to the anaerobic tank, and at the effluent of the anaerobic tank, in mg / L. R ana The ratio of the flow rate from the secondary sedimentation tank back to the anaerobic tank to the influent flow rate of the equalization tank is expressed as a percentage. α PAO These are the characteristic coefficients of PAO; α GAO These are the characteristic coefficients of GAO; PRA stands for Phosphate Release from Anaerobic Tanks, measured in mg / L. The α PAO and the α GAO The calculation method is as follows: Where, μ H This represents the maximum specific growth rate of heterotrophic bacteria, expressed in days (d). -1 The value range is 3.0-13.2; μ PAO This represents the maximum specific growth rate of polyphosphate-accumulating bacteria, expressed in days (d). -1 The value ranges from 0.5 to 4.0; μ GAO This represents the maximum specific growth rate of polysaccharide bacteria, expressed in days (d). -1 The value ranges from 0.5 to 4.0; S F It refers to fermentable and biodegradable organic matter, with units of mg / L, and the value range is 10-20% of the COD at the influent of the anaerobic tank; S A The value is a fermentation product, expressed in mg / L, and ranges from 2% to 10% of the COD at the anaerobic tank influent. K A The half-saturation coefficient of the fermentation product is expressed in g / m³. 3 The value is 4.0; K PHA The value is the half-saturation coefficient of PHA, expressed in g / g, and is 0.01. r PAO The proportion of PAO in heterotrophic bacteria; r GAO The proportion of GAO in heterotrophic bacteria; X PHA This refers to the PHA concentration, expressed in mg / L. X PAO This refers to the PAO concentration, expressed in mg / L. X GAO This represents the GAO concentration, expressed in mg / L.

[0006] By adopting the above technical solution, this application uses PHA to represent the internal carbon source in the AOA process and uses a special formula to calculate the PHA-COD internal carbon source conversion rate in the anaerobic tank. intra-PAO (%), GAO internal carbon source conversion rate PHA-COD intra-GAO (%) and characteristic coefficient α PAO and α GAO The parameters in the formula take into account the influence of microorganisms, and the value range of some parameters has been determined. Only a small number of parameters are not determined, but they can be obtained based on actual measurements. The calculation formula is simple, the calculated values ​​are accurate, and it conforms to actual production.

[0007] Optionally, the X PAO and the X GAO The calculation formula is as follows: when r PAO ≥r GAO At that time, X PHA =1.33*X PAO +1.82*X GAO X PAO :X GAO =r PAO :r GAO When r PAO <r GAO At that time, X PHA =2.23*X PAO +0.46*X GAO X PAO :X GAO =r PAO :r GAO .

[0008] By adopting the above technical solution, the X of this application PHA It can be directly detected by high performance liquid chromatography, r PAO and r GAO It can be obtained from 16S rDNA-seq high-throughput sequencing, based on r PAO and rGAO The ratio relationship is calculated in different cases. PAO and X GAO value.

[0009] Optionally, the formula for calculating the phosphate release (PRA) in the anaerobic tank is as follows: in, These are the effluent outlets of the anaerobic pond. Concentration, equalization tank inlet Concentration and in the sludge returned from the secondary sedimentation tank to the anaerobic tank Concentration, in mg / L.

[0010] Optionally, based on the PAO internal carbon source conversion rate (PHA-COD) in the anaerobic tank... intra-PAO (%) and the carbon source conversion rate (PHA-COD) of GAO in the anaerobic tank. intra-GAO (%) Calculate the total internal carbon source conversion rate (PHA-COD) in the anaerobic tank. intra-总 (%), the total internal carbon source conversion rate (PHA-COD) of the anaerobic tank intra-总 The formula for (%) is: PHA-COD intra-总 (%) = PHA - COD intra-PAO (%) + PHA-COD intra-GAO (%).

[0011] Optionally, based on the total internal carbon source conversion rate (PHA-COD) of the anaerobic tank... intra-总 (%) Calculate the carbon source conversion rate ΔPHA in the anaerobic tank. ana The carbon source conversion rate ΔPHA in the anaerobic tank ana The calculation formula is: ΔPHA ana =PHA-COD intra-总 (%)*[COD i +COD w1 *R ana -COD ana *(1+R ana )] / (1+R ana ).

[0012] By adopting the above technical solution, based on the PHA-COD internal carbon source conversion rate in the anaerobic tank... intra-PAO (%) and internal carbon source conversion rate of GAO PHA-COD intra-GAO (%) reflects the internal carbon source conversion in the anaerobic zone of the AOA process.

[0013] Optionally, the method further includes the following steps: calculating the carbon source consumption and internal carbon source consumption rate in the aerobic tank, wherein the carbon source consumption ΔPHA in the aerobic tank is...aer The calculation formula is: ΔPHA aer =(ΔPHA) ana *V1–PHA aer *MLVSS aer *V2) / V2, The formula for calculating the internal carbon source consumption rate in the aerobic tank is as follows: PHA aer % = (ΔPHA) aer *V2 / ΔPHA ana *V1)*100%, Among them, PHA aer It is the PHA concentration at the effluent of the aerobic tank, expressed in mg / gVSS, determined by gas chromatography. V1 is the volume of the anaerobic tank and V2 is the volume of the aerobic tank, both in L. MLVSS aer It is the concentration of volatile suspended solids in the mixed liquor of the aerobic tank, expressed in gVSS / L, and is determined directly by gravimetric method.

[0014] By adopting the above technical solution, this application can directly calculate the internal carbon source consumption and internal carbon source consumption rate in the aerobic tank. The parameters in the above formula are stable, and some parameters can be directly obtained from actual measurements, resulting in accurate calculation results.

[0015] Optionally, the following steps may also be included: calculating the COD consumption of denitrification in the anoxic tank. ano-DN (mg / L) and COD, the internal carbon source of denitrification ano-intro (mg / L), COD consumption of the anoxic tank denitrification ano-DN The formula for calculating (mg / L) is: in, These are the effluent from the aerobic tank, the sludge returning from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anoxic tank. Concentration, in mg / L; R ana R ano These are the ratios of the flow rate from the secondary sedimentation tank back to the anaerobic tank to the influent flow rate of the equalization tank, and the ratio of the flow rate from the secondary sedimentation tank back to the anoxic tank to the influent flow rate of the equalization tank, respectively, in percentage. These are the effluent from the aerobic tank, the sludge returning from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anoxic tank. Concentration, in mg / L; The anoxic tank denitrification internal carbon source COD ano-intro The formula for calculating (mg / L) is: CODano-intro =COD ano-DN -ΔCOD ano , Among them, ΔCOD ano This represents the difference between the COD at the effluent from the aerobic tank and the COD at the effluent from the anoxic tank.

[0016] Optionally, the method further includes the following steps: calculating the carbon source consumption and internal carbon source utilization rate in the anoxic tank, wherein the formula for calculating the carbon source consumption in the anoxic tank is: ΔPHA ano =r PHA *(ΔPHA ana -ΔPHA aer ), Where, r PHA The PHA utilization factor ranges from 0.5 to 3.0. ΔPHA ana This refers to the amount of carbon source converted within the anaerobic tank. ΔPHA aer This refers to the carbon source consumption in the aerobic tank. The formula for calculating the carbon source utilization rate in the anoxic tank is as follows: PHA ano % = COD ano-intro / ΔPHA ano *100%.

[0017] Optionally, the r PHA The verification calculation formula is as follows: Among them, PHA ano It is the PHA concentration at the effluent of the anoxic pool, expressed in mg / gVSS, determined by gas chromatography. N represents the number of measurements, ranging from 5 to 10. i represents the measurement sequence number.

[0018] By adopting the above technical solution, this application can directly calculate the internal carbon source consumption and utilization rate in the anoxic tank. Some parameters can be directly obtained from actual measurements, and the calculation results are accurate. PHA The coefficients are stable with small fluctuations, and can be calculated and verified using formulas to ensure r. PHA The accuracy of the values.

[0019] In summary, the present invention has at least one of the following beneficial technical effects: 1. The AOA process evaluation method of this application can directly calculate the internal carbon source conversion rate of PAO (polyphosphate-accumulating bacteria) and GAO (polysaccharide-accumulating bacteria) in the anaerobic tank, the phosphate release in the anaerobic tank, the total internal carbon source conversion rate in the anaerobic tank, the carbon source conversion amount in the anaerobic tank, the carbon source consumption in the aerobic tank, the carbon source consumption rate in the aerobic tank, the COD requirement for anoxic denitrification, the carbon source consumption in the anoxic tank, and the carbon source utilization rate in the anoxic tank. The calculation of the above formulas fills the gap in existing production and the lack of process parameter calculation. The AOA process evaluation method of this application conforms to the actual production, the method is intuitive and clear, and has practical value. 2. The logical operation formulas for evaluating the AOA process parameters designed in this application take into account the specific conditions of the biological tank and the factors of microorganisms. The evaluation method is efficient and accurate and meets the actual production needs. 3. All parameters used in this application can be directly measured or obtained through simple calculations, and in actual production, most parameters are relatively stable with small fluctuations, which fits the actual production needs. Attached Figure Description

[0020] Figure 1 The curve graph for application example 1; Figure 2 The graph is an application example 3. Detailed Implementation

[0021] The present application will be further described in detail below with reference to the accompanying drawings and embodiments.

[0022] A method for calculating carbon source conversion and utilization in a continuous flow AOA process includes the following steps: Calculate the COD content absorbed by microorganisms in the anaerobic tank. intra : Using PHA to represent the internal carbon source in the AOA process, calculate the PHA-COD conversion rate of the internal carbon source in the anaerobic tank. intra-PAO (%) and internal carbon source conversion rate of GAO PHA-COD intra-GAO (%) Carbon source conversion rate (PHA-COD) in PAO in anaerobic tank intra-PAO The formula for (%) is: Carbon source conversion rate (PHA-COD) in GAO in anaerobic tank intra-GAO The formula for (%) is: in, This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L; This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L; COD i COD w1 COD ana COD concentrations at the inlet of the equalization tank, in the sludge returned from the secondary sedimentation tank to the anaerobic tank, and at the effluent of the anaerobic tank, in mg / L. R ana The ratio of the flow rate from the secondary sedimentation tank back to the anaerobic tank to the influent flow rate of the equalization tank is expressed as a percentage. α PAO These are the characteristic coefficients of PAO; α GAO These are the characteristic coefficients of GAO; PRA stands for Phosphate Release from Anaerobic Tanks, measured in mg / L. α PAO and α GAO The calculation method is as follows: Where, μ H This represents the maximum specific growth rate of heterotrophic bacteria, expressed in days (d). -1 The value range is 3.0-13.2; μ PAO This represents the maximum specific growth rate of polyphosphate-accumulating bacteria, expressed in days (d). -1 The value ranges from 0.5 to 4.0; μ GAO This represents the maximum specific growth rate of polysaccharide bacteria, expressed in days (d). -1 The value ranges from 0.5 to 4.0; S F It refers to fermentable and biodegradable organic matter, with units of mg / L, and the value range is 10-20% of the COD at the influent of the anaerobic tank; S A The value is a fermentation product, expressed in mg / L, and ranges from 2% to 10% of the COD at the anaerobic tank influent. K A The half-saturation coefficient of the fermentation product is expressed in g / m³. 3 The value is 4.0; K PHA The value is the half-saturation coefficient of PHA, expressed in g / g, and is 0.01. r PAO The proportion of PAO in heterotrophic bacteria; r GAOThe proportion of GAO in heterotrophic bacteria; X PHA This refers to the PHA concentration, expressed in mg / L. X PAO This refers to the PAO concentration, expressed in mg / L. X GAO This represents the GAO concentration, expressed in mg / L.

[0023] Current AOA (Anoxic Alternating Current) processes place the anoxic tank after the traditional A2O (Anoxic to Oxygenation) process, eliminating nitrification liquor recirculation. Instead, they establish two recirculation points, one to the anaerobic tank and the other to the anoxic tank. Utilizing the ability of polyphosphate-accumulating bacteria (PAO) and polysaccharide-accumulating bacteria (GAO) to store and utilize internal carbon sources, they achieve endogenous denitrification, thus reducing the need for external carbon sources. However, this process flow differs from the traditional A2O process, representing a reaction flow not present in traditional processes. Therefore, existing methods cannot be applied to it, resulting in a lack of process parameter calculations and difficulties in measuring and analyzing the utilization of internal carbon sources and the denitrification effect.

[0024] Therefore, based on the lack of evaluation methods for the aforementioned AOA process, the applicant has designed a set of evaluation parameters for internal carbon source conversion efficiency and denitrification efficiency. The evaluation method combines AOA papers with activated sludge models, involving the internal carbon source conversion rate of anaerobic processes, the simultaneous nitrification and denitrification rate of aerobic processes, and the internal carbon source denitrification rate of anoxic processes. The method is intuitive and clear, can be applied to industrial production, and has practical value.

[0025] Furthermore, the AOA assessment method designed in this application has many parameters, takes into account the specific conditions of each biological tank, and considers the factors involving microorganisms, which meets the actual needs of production.

[0026] Finally, all the parameters used in this application can be directly measured or simply calculated. In actual production, most of the parameters are relatively stable with small fluctuations, which is very beneficial for production applications.

[0027] The wastewater used in this application was selected from the Fuyong Water Purification Plant (Phase II), in which COD... i The concentration is 368 mg / L.

[0028] Examples 1-6 A method for calculating carbon source conversion and utilization in a continuous flow AOA process includes the following steps: Calculate the COD content absorbed by microorganisms in the anaerobic tank. intra : Using PHA to represent the internal carbon source in the AOA process, calculate the PHA-COD conversion rate of the internal carbon source in the anaerobic tank. intra-PAO (%) and internal carbon source conversion rate of GAO PHA-COD intra-GAO (%) Carbon source conversion rate (PHA-COD) in PAO in anaerobic tank intra-PAO The formula for (%) is: Carbon source conversion rate (PHA-COD) in GAO in anaerobic tank intra-GAO The formula for (%) is: in, This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L, is obtained from on-site measurement; This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L, is obtained from on-site measurement; COD i COD w1 COD ana The COD concentrations are measured on-site at the inlet of the equalization tank, in the sludge returned from the secondary sedimentation tank to the anaerobic tank, and at the effluent of the anaerobic tank. The unit is mg / L. R ana The ratio of the flow rate from the secondary sedimentation tank back to the anaerobic tank to the influent flow rate of the equalization tank is expressed as a percentage, and its value is actually set on site. α PAO α is the characteristic coefficient of PAO; GAO These are the characteristic coefficients of GAO; PRA stands for Phosphate Release from Anaerobic Tanks, measured in mg / L. α PAO and α GAO The calculation method is as follows: Where, μ H This represents the maximum specific growth rate of heterotrophic bacteria, expressed in days (d). -1 ; μ PAO This represents the maximum specific growth rate of polyphosphate-accumulating bacteria, expressed in days (d). -1 ; μ GAO This represents the maximum specific growth rate of polysaccharide bacteria, expressed in days (d). -1 ; S F It refers to fermentable and biodegradable organic matter, with units of mg / L; S A These are fermentation products, expressed in mg / L. K A The half-saturation coefficient of the fermentation product is expressed in g / m³. 3 The value is 4.0; K PHA The value is the half-saturation coefficient of PHA, expressed in g / g, and is 0.01. r PAO The proportion of PAO in heterotrophic bacteria was obtained by 16S rDNA-seq high-throughput sequencing. r GAO The proportion of GAO in heterotrophic bacteria was obtained by 16S rDNA-seq high-throughput sequencing. X PHA The value represents the PHA concentration, expressed in mg / L, and was obtained through on-site measurement using high-performance liquid chromatography. X PAO This refers to the PAO concentration, expressed in mg / L. X GAO This refers to the GAO concentration, expressed in mg / L. X PAO and X GAO The calculation formula is as follows: When r PAO ≥r GAO At that time, X PHA =1.33*X PAO +1.82*X GAO X PAO :X GAO =r PAO :r GAO ; When r PAO <r GAO At that time, X PHA =2.23*X PAO +0.46*X GAO X PAO :X GAO =r PAO :r GAO ; The formula for calculating the phosphate release amount (PRA) in the anaerobic zone is: in, Anaerobic effluent Concentration, equalization tank influent Concentration and in the sludge returned from the secondary sedimentation tank to the anaerobic tank Concentration, in mg / L, is obtained from on-site measurement.

[0029] Based on the PAO internal carbon source conversion rate PHA-COD in the anaerobic tank intra-PAO(%) and the carbon source conversion rate (PHA-COD) of GAO in the anaerobic tank intra-GAO (%) Calculate the total internal carbon source conversion rate (PHA-COD) in the anaerobic tank. intra-总 (%), total internal carbon source conversion rate (PHA-COD) in the anaerobic tank intra-总 The formula for (%) is: PHA-COD intra-总 (%) = PHA - COD intra-PAO (%) + PHA-COD intra-GAO (%) The parameter values ​​for Examples 1-6 are shown in Table 1 below.

[0030] Table 1. Values ​​of parameters in Examples 1-6 Application Example 1 Using the parameters of Example 3 and the parameters based on actual measurements, and setting R... ana Calculate the PHA-COD internal carbon source conversion rate in the anaerobic tank, assuming a 100% threshold. intra-PAO (%) and the carbon source conversion rate (PHA-COD) of GAO in the anaerobic tank intra-GAO (%) and to calculate the total internal carbon source conversion rate (PHA-COD) of the anaerobic tank. intra-总 (%), plot the curve with time on the x-axis and internal carbon source conversion rate on the y-axis, see curve. Figure 1 .

[0031] Example 7 The process also includes the following steps: calculating the carbon source consumption and internal carbon source consumption rate in the aerobic tank, and the carbon source consumption ΔPHA in the aerobic tank. aer The formula is: ΔPHA aer =(ΔPHA) ana *V1–PHA aer *MLVSS aer *V2) / V2, The formula for the carbon source consumption rate in an aerobic tank is: PHA aer % = (ΔPHA) aer *V2 / ΔPHA ana *V1)*100%, Among them, PHA aer It is the PHA concentration at the effluent of the aerobic tank, expressed in mg / gVSS, determined by gas chromatography; the value is obtained through on-site measurement. V1 and V2 are the volumes of the anaerobic tank and the aerobic tank, respectively, in liters (L). These values ​​are obtained from actual on-site measurements. MLVSS aerIt is the concentration of volatile suspended solids in the mixed liquor of the aerobic tank, expressed in gVSS / L, and is determined directly on-site by gravimetric method; The total internal carbon source conversion rate (PHA-COD) of the anaerobic tank in Example 3 was used. intra-总 (%) Calculate the carbon source conversion rate in the anaerobic tank. The formula for calculating the carbon source conversion rate in the anaerobic tank is: ΔPHA ana =PHA-COD intra-总 (%)*[COD i +COD w1 *R ana -COD ana *(1+R ana )] / (1+R ana ).

[0032] Application Example 2 The carbon source consumption ΔPHA in the aerobic tank was calculated using the parameters from Example 7 and the parameters obtained from actual measurements. aer Where V1 is 25420000L, V2 is 30340000L, and R is set. ana 100%, MLVSS aer The concentration was 4.620 gVSS / L, PHA aer The value was 47.98 mg / g VSS, and the calculated internal carbon source consumption in the aerobic tank was 171.8178 mg / L.

[0033] Examples 8-10 The process also includes the following steps: calculating the COD consumption of anoxic denitrification. ano-DN (mg / L) and COD, the internal carbon source of denitrification ano-intro COD consumption during anoxic denitrification ano-DN The formula for calculating (mg / L) is: in, These are, respectively, the aerobic effluent outlet, the sludge returning from the secondary sedimentation tank to the anaerobic tank, and the anoxic effluent outlet. Concentration, in mg / L, is obtained from on-site measurement; R ana R ano These are the ratios of the flow rate from the secondary sedimentation tank back to the anaerobic tank to the influent flow rate of the equalization tank, and the ratio of the flow rate from the secondary sedimentation tank back to the anoxic tank to the influent flow rate of the equalization tank, respectively, in percentage. The values ​​are actually set on-site. These are, respectively, the aerobic effluent outlet, the sludge returning from the secondary sedimentation tank to the anaerobic tank, and the anoxic effluent outlet. Concentration, in mg / L, is obtained from on-site measurement; Denitrification internal carbon source COD ano-intro The calculation formula is: COD ano-intro =COD ano-DN -ΔCOD ano , Among them, ΔCOD ano This represents the difference between the COD at the effluent from the aerobic tank and the COD at the effluent from the anoxic tank.

[0034] The method also includes the following steps: calculating the carbon source consumption and utilization rate in the anoxic tank, based on the carbon source conversion rate ΔPHA in the anaerobic tank in Example 7. ana Carbon source consumption ΔPHA in the aerobic tank aer The carbon source consumption in the anoxic tank is calculated using the following formula: ΔPHA ano =r PHA *(ΔPHA ana -ΔPHA aer ), Where, r PHA Let r be the PHA utilization factor, and r PHA The following formula was used to verify r. PHA The accuracy of the values.

[0035] Among them, PHA ano，i ΔPHA is the PHA concentration at the effluent of the i-th anoxic tank, expressed in mg / gVSS, determined by gas chromatography. ana,i ΔPHA is the carbon source conversion amount in the i-th anaerobic digester. aer,i This is the carbon source consumption in the i-th aerobic tank; N represents the number of measurements, ranging from 5 to 10. i represents the measurement sequence number.

[0036] The formula for calculating the utilization rate of internal carbon sources in anoxic tanks is as follows: PHA ano % = COD ano-intro / ΔPHA ano *100%.

[0037] Example 8 r PHA This is the PHA utilization factor, with a value of 0.5.

[0038] Example 9 r PHA The PHA utilization factor is set to 2.

[0039] Example 10 r PHAThe PHA utilization factor is set to 3.

[0040] Application Example 3 Using the parameters from Example 9 and the parameters measured in actual tests, the internal carbon source conversion rate in the anoxic tank was calculated, and R was set. ana For 100%, R ano With 100% as the baseline, a curve was plotted with time on the x-axis and the utilization rate of the internal carbon source in the anoxic tank on the y-axis. (See curve [reference needed]). Figure 2 .

[0041] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A method for calculating the carbon source conversion rate and utilization rate in a continuous flow AOA process, characterized in that, Includes the following steps: Calculate the COD content absorbed by microorganisms in the anaerobic tank. intra : Using PHA to represent the internal carbon source in the AOA process, calculate the PHA-COD conversion rate of the internal carbon source in the anaerobic tank. intra-PAO (%) and internal carbon source conversion rate of GAO PHA-COD intra-GAO (%) Carbon source conversion rate (PHA-COD) in PAO in anaerobic tank intra-PAO The formula for (%) is: Carbon source conversion rate (PHA-COD) in GAO in anaerobic tank intra-GAO The formula for (%) is: in, This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L; This includes the inlet of the equalization tank, the sludge returned from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anaerobic tank. Concentration, in mg / L; COD i COD w1 COD ana COD concentrations at the inlet of the equalization tank, in the sludge returned from the secondary sedimentation tank to the anaerobic tank, and at the effluent of the anaerobic tank, in mg / L. R ana The ratio of the flow rate from the secondary sedimentation tank back to the anaerobic tank to the influent flow rate of the equalization tank is expressed as a percentage. α PAO These are the characteristic coefficients of PAO; α GAO These are the characteristic coefficients of GAO; PRA stands for Phosphate Release from Anaerobic Tanks, measured in mg / L. The α PAO and the α GAO The calculation method is as follows: Where, μ H This represents the maximum specific growth rate of heterotrophic bacteria, expressed in days (d). -1 The value range is 3.0-13.2; μ PAO This represents the maximum specific growth rate of polyphosphate-accumulating bacteria, expressed in days (d). -1 The value ranges from 0.5 to 4.0; μ GAO This represents the maximum specific growth rate of polysaccharide bacteria, expressed in days (d). -1 The value ranges from 0.5 to 4.0; S F It refers to fermentable and biodegradable organic matter, with units of mg / L, and the value range is 10-20% of the COD at the influent of the anaerobic tank; S A The value is a fermentation product, expressed in mg / L, and ranges from 2% to 10% of the COD at the anaerobic tank influent. K A The half-saturation coefficient of the fermentation product is expressed in g / m³. 3 The value is 4.0; K PHA The value is the half-saturation coefficient of PHA, expressed in g / g, and is 0.

01. r PAO The proportion of PAO in heterotrophic bacteria; r GAO The proportion of GAO in heterotrophic bacteria; X PHA This refers to the PHA concentration, expressed in mg / L. X PAO This refers to the PAO concentration, expressed in mg / L. X GAO This represents the GAO concentration, expressed in mg / L.

2. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 1, characterized in that, The X PAO and the X GAO The calculation formula is as follows: when r PAO ≥r GAO At that time, X PHA =1.33*X PAO +1.82*X GAO X PAO :X GAO =r PAO :r GAO When r PAO <r GAO At that time, X PHA =2.23*X PAO +0.46*X GAO X PAO :X GAO =r PAO :r GAO .

3. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 1, characterized in that, The formula for calculating the phosphate release (PRA) in the anaerobic tank is as follows: in, These are the effluent outlets of the anaerobic pond. Concentration, equalization tank inlet Concentration and in the sludge returned from the secondary sedimentation tank to the anaerobic tank Concentration, in mg / L.

4. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 1, characterized in that, Based on the PAO internal carbon source conversion rate PHA-COD in the anaerobic tank intra-PAO (%) and the carbon source conversion rate (PHA-COD) of GAO in the anaerobic tank. intra-GAO (%) Calculate the total internal carbon source conversion rate (PHA-COD) in the anaerobic tank. intra-总 (%), the total internal carbon source conversion rate (PHA-COD) of the anaerobic tank intra-总 The formula for calculating (%) is: PHA-COD intra-总 (%)=PHA-COD intra-PAO (%)+PHA-COD intra-GAO (%)。 5. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 4, characterized in that, Based on the total internal carbon source conversion rate (PHA-COD) in the anaerobic tank intra-总 (%) Calculate the carbon source conversion rate ΔPHA in the anaerobic tank. ana The carbon source conversion rate ΔPHA in the anaerobic tank ana The calculation formula is: ΔPHA ana =PHA-COD intra-总 (%)*[CODE i +CODE w1 *R ana -CODE ana *(1+R ana )] / (1+R ana )。 6. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 1, characterized in that, The method also includes the following steps: calculating the carbon source consumption and internal carbon source consumption rate in the aerobic tank, wherein the carbon source consumption ΔPHA in the aerobic tank is... aer The calculation formula is: ΔPHA aer =(ΔPHA ana *V1–PHA aer *MLVSS aer *V2) / V2, The formula for calculating the carbon source consumption rate in the aerobic tank is as follows: PHA aer %=(ΔPHA aer *V2 / ΔPHA ana *V1)*100%, Among them, PHA aer It is the PHA concentration at the effluent of the aerobic tank, expressed in mg / gVSS, determined by gas chromatography. V1 is the volume of the anaerobic tank and V2 is the volume of the aerobic tank, in liters (L). MLVSS aer It is the concentration of volatile suspended solids in the mixed liquor of the aerobic tank, expressed in gVSS / L, and is determined directly by gravimetric method.

7. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 1, characterized in that, The process also includes the following steps: calculating the COD consumption of the anoxic tank denitrification process. ano-DN (mg / L) and COD, the internal carbon source of denitrification ano-intro (mg / L), COD consumption of the anoxic tank denitrification ano-DN The formula for calculating (mg / L) is: in, These are the effluent from the aerobic tank, the sludge returning from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anoxic tank. Concentration, in mg / L; R ana R ano These are the ratios of the flow rate from the secondary sedimentation tank back to the anaerobic tank to the influent flow rate of the equalization tank, and the ratio of the flow rate from the secondary sedimentation tank back to the anoxic tank to the influent flow rate of the equalization tank, respectively, in percentage. These are the effluent from the aerobic tank, the sludge returning from the secondary sedimentation tank to the anaerobic tank, and the effluent from the anoxic tank. Concentration, in mg / L; The anoxic tank denitrification internal carbon source COD ano-intro The formula for calculating (mg / L) is: CODE ano-intro =COD ano-DN -ΔCOD ano , Among them, ΔCOD ano This represents the difference between the COD at the effluent from the aerobic tank and the COD at the effluent from the anoxic tank.

8. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 1, characterized in that, The method also includes the following steps: calculating the carbon source consumption and internal carbon source utilization rate in the anoxic tank. The formula for calculating the carbon source consumption in the anoxic tank is as follows: ΔPHA ano =r PHA *(ΔPHA ana -ΔPHA aer ), Where, r PHA The PHA utilization factor ranges from 0.5 to 3.

0. ΔPHA ana This refers to the amount of carbon source converted within the anaerobic tank. ΔPHA aer This refers to the carbon source consumption in the aerobic tank. The formula for calculating the carbon source utilization rate in the anoxic tank is as follows: PHA ano %=COD ano-intro / ΔPHA ano *100%。 9. The method for calculating carbon source conversion rate and utilization rate in a continuous flow AOA process according to claim 8, characterized in that, The r PHA The verification calculation formula is as follows: Among them, PHA ano，i is the PHA concentration at the effluent of the i-th anoxic pool, in mg / gVSS, determined by gas chromatography. ΔPHA ana,i ΔPHA is the carbon source conversion amount in the i-th anaerobic digester. aer,i This is the carbon source consumption in the i-th aerobic tank; N represents the number of measurements, ranging from 5 to 10. i represents the measurement sequence number.

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