Methods and devices for carbon emission life cycle accounting of decentralized rural wastewater treatment facilities

Abstract

This invention provides a method and apparatus for calculating the carbon emission lifecycle of decentralized rural wastewater treatment facilities, relating to the field of carbon emission accounting technology. The invention acquires wastewater treatment time-series data for each rural wastewater treatment facility, including carbon-to-nitrogen ratio (CNR) time-series data and dissolved oxygen concentration (DOC) time-series data. The total time of the wastewater treatment time-series data is divided into multiple equally timed periods. Direct and frequency domain features of the CNR and DOC concentration are extracted for each time period. Based on these direct and frequency domain features, a nitrous oxide (NO) carbon emission factor adjustment rule is set. The NOC carbon emission factor for each time period is adjusted, and the total NOC emission is calculated based on the adjusted NOC carbon emission factor. The total methane emission and indirect carbon emission of the wastewater treatment facility are obtained, and the carbon emission of the wastewater treatment facility throughout its entire lifecycle is calculated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of carbon emission accounting, in particular to a method and device for accounting for the full life cycle of carbon emissions of a decentralized rural sewage treatment facility. BACKGROUND

[0002] With the advancement of rural sewage treatment, the construction and operation of decentralized sewage treatment facilities are expanding, but the carbon emissions during operation are increasingly concerned. Existing carbon emission accounting methods rely on fixed emission factors, which cannot accurately reflect the dynamic characteristics of greenhouse gas emissions such as nitrous oxide caused by water quality frequency (such as carbon-nitrogen ratio and dissolved oxygen concentration changes) in actual operation. Especially in rural areas, the water quality frequency is large and the monitoring data is discontinuous, and the traditional method cannot effectively capture the influence of time sequence changes on carbon emission factors, resulting in large deviation of the accounting results, which restricts the development of low-carbon operation strategies and the evaluation of emission reduction effect.

[0003] The traditional method relies on static and fixed emission factors, which cannot respond to the dynamic changes of water quality parameters in the sewage treatment process. The water quality of rural sewage has significant time sequence fluctuation, and the traditional fixed factor method regards it as a stable state, which cannot accurately capture the instantaneous emission peak and valley of key greenhouse gases such as nitrous oxide in actual biochemical reactions, resulting in systematic deviation between the accounting results and the actual emissions.

[0004] The above information disclosed in the background section is only used to enhance the understanding of the background of the present disclosure, and therefore it can include information that does not constitute prior art known to those of ordinary skill in the art. SUMMARY

[0005] The purpose of the present application is to provide a method and device for accounting for the full life cycle of carbon emissions of a decentralized rural sewage treatment facility to solve the problems raised in the background.

[0006] To achieve the above-mentioned purpose, the present application provides the following technical solutions:

[0007] A method for accounting for the full life cycle of carbon emissions of a decentralized rural sewage treatment facility, comprising the following specific steps:

[0008] Step 1: Obtain the sewage treatment time sequence data of each rural sewage treatment facility, which includes carbon-nitrogen ratio time sequence data and dissolved oxygen concentration time sequence data;

[0009] Step 2: Divide the total time of the sewage treatment time sequence data into multiple time intervals of equal time intervals, sort the time intervals in chronological order, and obtain the carbon-nitrogen ratio sub-time sequence data and dissolved oxygen concentration sub-time sequence data corresponding to each time interval;

[0010] Step 3: extract direct features and frequency domain features of each carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data, and set nitrous oxide carbon emission factor adjustment rules based on the direct features and the frequency domain features;

[0011] Step 4: obtain calibrated nitrous oxide carbon emission factors for each time period by combining the nitrous oxide carbon emission factor of the first time period and the nitrous oxide carbon emission factor adjustment rules, calculate the nitrous oxide emissions of each sewage treatment facility based on the calibrated nitrous oxide carbon emission factors, and calculate the total nitrous oxide emissions;

[0012] Step 5: obtain the total methane emissions of the sewage treatment facility, determine the direct carbon emissions by combining the total nitrous oxide emissions, obtain indirect carbon emission data of the sewage treatment facility, determine the indirect carbon emissions based on the indirect carbon emission data, and determine the carbon emissions of the sewage treatment facility in the whole life cycle based on the direct carbon emissions and the indirect carbon emissions.

[0013] Further, the direct features of the carbon-nitrogen ratio sub-time series data are the carbon-nitrogen ratio mean value, the direct features of the dissolved oxygen concentration sub-time series data are the dissolved oxygen concentration mean value, the frequency domain features of the carbon-nitrogen ratio sub-time series data are the carbon-nitrogen ratio frequency domain main frequency, and the frequency domain features of the dissolved oxygen concentration sub-time series data are the dissolved oxygen concentration frequency domain main frequency. The carbon-nitrogen ratio frequency domain main frequency and the dissolved oxygen concentration frequency domain main frequency of the first time period are referred to as the carbon-nitrogen ratio frequency domain standard main frequency and the dissolved oxygen concentration frequency domain standard main frequency.

[0014] Further, the nitrous oxide carbon emission factor adjustment rules include adjustment judgment rules and adjustment implementation rules.

[0015] For any time period other than the first time period, if the time period meets the adjustment judgment rules, the nitrous oxide carbon emission factor of the previous time period is adjusted using the adjustment implementation rules, and the adjusted nitrous oxide carbon emission factor is used as the calibrated nitrous oxide carbon emission factor of the time period.

[0016] If the adjustment judgment rules are not met, the nitrous oxide carbon emission factor of the previous time period is directly used as the calibrated nitrous oxide carbon emission factor of the time period.

[0017] For the first time period, the nitrous oxide carbon emission factor is used as the calibrated nitrous oxide carbon emission factor.

[0018] Further, for any time period other than the first time period, the absolute difference between the carbon-nitrogen ratio mean value of the time period and the previous time period, and the absolute difference between the dissolved oxygen concentration mean value are calculated, the carbon-nitrogen ratio absolute difference threshold value and the dissolved oxygen concentration absolute difference threshold value are set, the adjustment judgment rules include the first adjustment judgment rules and the second adjustment judgment rules, and meeting one of the first adjustment judgment rules and the second adjustment judgment rules is considered to meet the adjustment judgment rules.

[0019] preset carbon-nitrogen ratio threshold value and a dissolved oxygen concentration standard range;

[0020] The first adjustment judgment rule is that the carbon-nitrogen ratio average value of at least one of the time period and the previous time period is less than the carbon-nitrogen ratio threshold value, and the absolute difference of the carbon-nitrogen ratio average value is greater than the carbon-nitrogen ratio absolute difference threshold value.

[0021] The second adjustment judgment rule is that the dissolved oxygen concentration average value of at least one of the time period and the previous time period is not within the dissolved oxygen concentration standard range, and the absolute difference of the dissolved oxygen concentration average value is greater than the dissolved oxygen concentration absolute difference threshold value.

[0022] Further, a preset adjustment amplitude is used to implement the adjustment implementation rule, specifically:

[0023] If only the first adjustment rule or the second adjustment rule is met, the calibrated nitrous oxide carbon emission factor of the time period is obtained by adjusting the nitrous oxide carbon emission factor of the previous time period by an integer multiple of the adjustment amplitude as a gradient.

[0024] If the first adjustment judgment rule and the second adjustment judgment rule are both met, and when the difference between the carbon-nitrogen ratio average values of the time period and the previous time period is greater than 0, and the distance between the dissolved oxygen concentration average value of the time period and the dissolved oxygen concentration standard range is less than the distance between the dissolved oxygen concentration average value of the previous time period and the dissolved oxygen concentration standard range, or when the carbon-nitrogen ratio average values of the time period and the previous time period are not greater than 0, the distance between the dissolved oxygen concentration average value of the time period and the dissolved oxygen concentration standard range is greater than the distance between the dissolved oxygen concentration average value of the previous time period and the dissolved oxygen concentration standard range, the calibrated nitrous oxide carbon emission factor of the time period is obtained by adjusting the nitrous oxide carbon emission factor of the previous time period by an integer multiple of the adjustment amplitude as a gradient.

[0025] If the first adjustment judgment rule and the second adjustment judgment rule are both met, and the difference between the carbon-nitrogen ratio average values of the time period and the previous time period is greater than 0, and the distance between the dissolved oxygen concentration average value of the time period and the dissolved oxygen concentration standard range is greater than the distance between the dissolved oxygen concentration average value of the previous time period and the dissolved oxygen concentration standard range, or if the first adjustment judgment rule and the second adjustment judgment rule are both met, and the difference between the carbon-nitrogen ratio average values of the time period and the previous time period is not greater than 0, the distance between the dissolved oxygen concentration average value of the time period and the dissolved oxygen concentration standard range is less than the distance between the dissolved oxygen concentration average value of the previous time period and the dissolved oxygen concentration standard range, the calibrated nitrous oxide carbon emission factor of the time period is obtained by adjusting the nitrous oxide carbon emission factor of the previous time period by a multiple less than 1 of the adjustment amplitude as a gradient.

[0026] Further, the logic of adjusting by an integer multiple of the adjustment amplitude is:

[0027] If only the first adjustment judgment rule is satisfied, and if the difference between the carbon-nitrogen ratio average of the time period and the previous time period is greater than 0, the nitrous oxide carbon emission factor of the previous time period is reduced by the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period; if the difference between the carbon-nitrogen ratio average of the time period and the previous time period is not greater than 0, the nitrous oxide carbon emission factor of the previous time period is added by the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period;

[0028] If only the second adjustment judgment rule is satisfied, the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is calculated respectively, and if the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is greater than the distance between the previous time period and the dissolved oxygen concentration standard range, the nitrous oxide carbon emission factor of the previous time period is added by the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period; if the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is less than the distance between the previous time period and the dissolved oxygen concentration standard range, the nitrous oxide carbon emission factor of the previous time period is reduced by the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period; if the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is equal to the distance between the previous time period and the dissolved oxygen concentration standard range, the nitrous oxide carbon emission factor of the previous time period serves as the calibrated nitrous oxide carbon emission factor of the time period;

[0029] If the first adjustment judgment rule and the second adjustment judgment rule are satisfied at the same time, and if the difference between the carbon-nitrogen ratio average of the time period and the previous time period is greater than 0, and if the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is less than the distance between the previous time period and the dissolved oxygen concentration standard range, the nitrous oxide carbon emission factor of the previous time period is reduced by 2 times the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period;

[0030] If the first adjustment judgment rule and the second adjustment judgment rule are satisfied at the same time, and if the difference between the carbon-nitrogen ratio average of the time period and the previous time period is not greater than 0, and if the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is greater than the distance between the previous time period and the dissolved oxygen concentration standard range, the nitrous oxide carbon emission factor of the previous time period is added by 2 times the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period.

[0031] Further, the logic of adjusting by a gradient of less than 1 times the adjustment amplitude is as follows:

[0032] If the first adjustment judgment rule and the second adjustment judgment rule are met at the same time, and the difference between the carbon-nitrogen ratio average of the time period and the last time period is greater than 0, the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is greater than the distance between the last time period and the dissolved oxygen concentration standard range, the absolute difference between the carbon-nitrogen ratio frequency main frequency of the time period and the carbon-nitrogen ratio frequency standard main frequency is calculated, and is recorded as the carbon-nitrogen ratio main frequency difference, and the absolute difference between the dissolved oxygen concentration frequency main frequency and the dissolved oxygen concentration frequency standard main frequency is recorded as the dissolved oxygen main frequency difference, if the carbon-nitrogen ratio main frequency difference is greater than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the last time period is reduced by 0.5 times the adjustment amplitude, and is used as the nitrous oxide carbon emission factor of the time period, if the carbon-nitrogen ratio main frequency difference is less than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the last time period is added by 0.5 times the adjustment amplitude, and is used as the nitrous oxide carbon emission factor of the time period, if the carbon-nitrogen ratio main frequency difference is equal to the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the last time period is used as the calibrated nitrous oxide carbon emission factor of the time period.

[0033] If the first adjustment judgment rule and the second adjustment judgment rule are met at the same time, and the difference between the carbon-nitrogen ratio average of the time period and the last time period is not greater than 0, the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is less than the distance between the last time period and the dissolved oxygen concentration standard range, the carbon-nitrogen ratio main frequency difference and the dissolved oxygen main frequency difference are calculated, if the carbon-nitrogen ratio main frequency difference is greater than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the last time period is added by 0.5 times the adjustment amplitude, and is used as the nitrous oxide carbon emission factor of the time period, if the carbon-nitrogen ratio main frequency difference is less than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the last time period is reduced by 0.5 times the adjustment amplitude, and is used as the nitrous oxide carbon emission factor of the time period, if the carbon-nitrogen ratio main frequency difference is equal to the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the last time period is used as the calibrated nitrous oxide carbon emission factor of the time period.

[0034] Further, based on the nitrous oxide carbon emission factor of each time period of each sewage treatment facility, the total nitrous oxide emission is calculated by using the emission factor method, and the total methane emission is directly calculated by using the carbon emission factor method.

[0035] Further, the indirect carbon emission data includes carbon dioxide greenhouse gas emission corresponding to energy and resource consumption in the construction, operation and demolition processes, and is calculated by using the carbon emission factor method.

[0036] The application further provides a distributed rural sewage treatment facility carbon emission full life cycle accounting device, which is used for realizing the distributed rural sewage treatment facility carbon emission full life cycle accounting method, and specifically comprises:

[0037] The data acquisition module is used for acquiring sewage treatment time series data of each rural sewage treatment facility, and the sewage treatment time series data includes carbon-nitrogen ratio time series data and dissolved oxygen concentration time series data;

[0038] The data segmentation module is used for dividing the total time of the sewage treatment time series data into multiple equal time interval time periods, sorting the time periods in time sequence, and acquiring carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data corresponding to each time period;

[0039] The feature extraction module is used for extracting direct features and frequency domain features of each carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data, and setting nitrous oxide carbon emission factor adjustment rules based on the direct features and the frequency domain features;

[0040] The characteristic operation module is used for acquiring a calibrated nitrous oxide carbon emission factor of each time period by combining the nitrous oxide carbon emission factor of the first time period and the nitrous oxide carbon emission factor adjustment rules, calculating the nitrous oxide emission of each sewage treatment facility based on the calibrated nitrous oxide carbon emission factor, and calculating the total nitrous oxide emission;

[0041] The final accounting module is used for acquiring the total methane emission of the sewage treatment facility, determining the direct carbon emission by combining the total nitrous oxide emission, acquiring the indirect carbon emission data of the sewage treatment facility, determining the indirect carbon emission based on the indirect carbon emission data, and determining the carbon emission of the sewage treatment facility in the whole life cycle based on the direct carbon emission and the indirect carbon emission.

[0042] Compared with the prior art, the beneficial effects of the present application are:

[0043] The present application divides the time series data of carbon-nitrogen ratio and dissolved oxygen concentration into equal interval time periods, extracts multi-dimensional features such as mean value, standard deviation and frequency domain main frequency of each time period, establishes a dynamic adjustment plan of nitrous oxide carbon emission factor based on water quality feature change, can accurately capture the influence of rural sewage water quality frequency domain on nitrous oxide emission, and solves the problem of large accounting deviation of traditional fixed emission factor method in response to dynamic water quality change. BRIEF DESCRIPTION OF DRAWINGS

[0044] Figure 1 It is a whole method flowchart of the present application;

[0045] Figure 2 It is a nitrous oxide emission comparison chart;

[0046] Figure 3 It is a whole device structure schematic diagram of the present application. DETAILED DESCRIPTION

[0047] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with specific embodiments.

[0048] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the present application shall have the usual meaning understood by a person with ordinary skill in the art to which the present application belongs. The terms "first", "second" and similar words used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar words mean that the elements or objects before the words cover the elements or objects listed after the words and their equivalents, without excluding other elements or objects. The terms "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "up", "down", "left", "right" and the like are only used to represent relative positional relationships, which may change accordingly when the absolute positions of the described objects change.

[0049] Embodiments:

[0050] Please refer to Figure 1 The present application provides a technical solution:

[0051] A distributed rural sewage treatment facility carbon emission life cycle accounting method, the specific steps comprising:

[0052] Step 1: Obtain the sewage treatment time series data of each rural sewage treatment facility, the sewage treatment time series data including carbon-nitrogen ratio time series data and dissolved oxygen concentration time series data;

[0053] The sewage treatment time series data is the sewage treatment time series data of the entire operation stage.

[0054] The carbon-nitrogen ratio is a key limiting factor for controlling whether the microbial denitrification in the sewage treatment process can be completed thoroughly. In the process of reducing nitrate to harmless nitrogen by denitrifying bacteria, sufficient organic carbon is needed as an electron donor and energy source. When the carbon-nitrogen ratio is too low, the denitrification process will be interrupted, resulting in a large accumulation and release of intermediate product- powerful greenhouse gas nitrous oxide (N2O).

[0055] The dissolved oxygen concentration directly determines the balance and efficiency of the two key reactions of aerobic nitrification and anoxic denitrification in the sewage treatment biochemical tank. Too high dissolved oxygen concentration will inhibit the activity of denitrifying bacteria, forcing the denitrification process to proceed under unfavorable conditions, increasing the generation of N2O; while too low concentration may lead to incomplete nitrification process, which will also cause accumulation of N2O. Therefore, whether the dissolved oxygen concentration is stable within the suitable range of microbial community is an important indication of whether the system operation state is stable and the risk of N2O emission.

[0056] Step 2: Divide the total time of the wastewater treatment time series data into multiple time intervals of equal time interval, sort the time intervals according to the time sequence, and obtain the carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data corresponding to each time interval;

[0057] Furthermore, the direct characteristic of the carbon-nitrogen ratio sub-time series data is the mean carbon-nitrogen ratio, the direct characteristic of the dissolved oxygen concentration sub-time series data is the mean dissolved oxygen concentration, the frequency domain characteristic of the carbon-nitrogen ratio sub-time series data is the dominant frequency of the carbon-nitrogen ratio, and the frequency domain characteristic of the dissolved oxygen concentration sub-time series data is the dominant frequency of the dissolved oxygen concentration. The dominant frequency of the carbon-nitrogen ratio and the dominant frequency of the dissolved oxygen concentration in the first time period are called the standard dominant frequency of the carbon-nitrogen ratio and the standard dominant frequency of the dissolved oxygen concentration.

[0058] The mean represents the average performance level of the carbon-nitrogen ratio or dissolved oxygen concentration within a given time period. It allows us to grasp the overall state and stability of water quality parameters at a macroscopic level and serves as a direct basis for judging whether the biochemical environment is within the ideal range.

[0059] The dominant frequency is obtained through frequency domain methods. Specifically, Fourier transform is performed on the two sub-time series data within the analysis period to obtain the corresponding spectrum data. The frequency with the largest amplitude is called the dominant frequency, which reflects the fluctuation pattern, rhythm, and regularity of the time series data.

[0060] Step 3: Extract the direct features and frequency domain features of each carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data, and set the nitrous oxide carbon emission factor adjustment rules based on the direct features and frequency domain features;

[0061] Furthermore, the rules for adjusting nitrous oxide carbon emission factors include rules for determining the adjustment and rules for implementing the adjustment;

[0062] For any time period other than the first time period, if the time period meets the adjustment judgment rule, the adjustment implementation rule is used to adjust the nitrous oxide carbon emission factor of the previous time period, and the adjusted nitrous oxide carbon emission factor is used as the calibrated nitrous oxide carbon emission factor of the current time period.

[0063] If the adjustment judgment rule is not met, the nitrous oxide carbon emission factor of the previous time period will be directly used as the calibrated nitrous oxide carbon emission factor of the current time period.

[0064] For the first time period, its nitrous oxide carbon emission factor was used as the calibration nitrous oxide carbon emission factor.

[0065] The nitrous oxide carbon emission in the first time period is measured by using professional instruments, and all related parameters in the carbon emission factor method except the nitrous oxide carbon emission factor are obtained, including the total amount of the treated water in the time period, the nitrogen concentration in the influent, the nitrogen concentration in the effluent, and the global warming potential of nitrous oxide, and the nitrous oxide carbon emission factor in the first time period is inversely deduced based on the related parameters and the nitrous oxide carbon emission, since the direct measurement of the nitrous oxide carbon emission needs to collect nitrous oxide gas and use expensive equipment such as a high-precision gas analyzer, and the distributed decentralized rural sewage treatment facilities need to consume a large amount of cost for arrangement and maintenance of related facilities, therefore, the nitrous oxide carbon emission factor in the first time period is determined only, and the nitrous oxide carbon emission factor in the subsequent time period is determined by using the nitrous oxide carbon emission factor adjustment rule.

[0066] Further, for any time period except the first time period, the absolute difference between the average carbon-nitrogen ratio of the time period and the previous time period and the absolute difference between the average dissolved oxygen concentration are calculated, the carbon-nitrogen ratio absolute difference threshold value and the dissolved oxygen concentration absolute difference threshold value are set, and the adjustment judgment rule includes the first adjustment judgment rule and the second adjustment judgment rule, and any one meeting the first adjustment judgment rule and the second adjustment judgment rule is regarded as meeting the adjustment judgment rule.

[0067] The carbon-nitrogen ratio threshold value and the dissolved oxygen concentration standard range are preset, and the carbon-nitrogen ratio threshold value and the dissolved oxygen concentration standard range can be obtained by consulting literature and local standards. The carbon-nitrogen ratio absolute difference threshold value and the dissolved oxygen concentration absolute difference threshold value are determined by inviting experts in the field to demonstrate the local specific sewage discharge conditions based on literature data, so as to determine the appropriate carbon-nitrogen ratio absolute difference threshold value and the dissolved oxygen concentration absolute difference threshold value, which is a prior art and will not be described here.

[0068] The first adjustment judgment rule is that the average carbon-nitrogen ratio of at least one of the time period and the previous time period is less than the carbon-nitrogen ratio threshold value, and the absolute difference between the average carbon-nitrogen ratio is greater than the carbon-nitrogen ratio absolute difference threshold value. Whether the carbon-nitrogen ratio changes directly affects the emission factor of nitrous oxide. According to the foregoing description, the carbon-nitrogen ratio mainly affects the carbon emission factor of nitrous oxide through the sufficiency and lack of carbon source. Under normal circumstances, the carbon-nitrogen ratio changes greatly enough to need to adjust the carbon emission factor of nitrous oxide. However, if the carbon source of the time period and the previous time period is sufficient (both are not less than the carbon-nitrogen ratio threshold value), although the change is large, it still does not affect the carbon emission factor of nitrous oxide.

[0069] The second adjustment judgment rule is that the average dissolved oxygen concentration of at least one of the time period and the previous time period is not within the dissolved oxygen concentration standard range, and the absolute difference between the average dissolved oxygen concentration is greater than the dissolved oxygen concentration absolute difference threshold value.

[0070] As with the carbon-nitrogen ratio, when the dissolved oxygen concentration itself is too large or too small, its change will only cause a sharp change in the carbon emission factor of nitrous oxide. If the dissolved oxygen concentration of the time period and the previous time period is within the standard range, although the fluctuation of the average value before and after is large, the influence on the carbon emission factor of nitrous oxide can be ignored. Therefore, if one of the first adjustment judgment rule and the second adjustment judgment rule is met, it is considered that the adjustment judgment rule is met.

[0071] Further, a preset adjustment amplitude is set, and the adjustment implementation rule is: if only the first adjustment judgment rule is met, and the difference between the carbon-nitrogen ratio average values of the time period and the previous time period is greater than 0, then the nitrous oxide carbon emission factor of the previous time period is reduced by the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period; when the difference between the carbon-nitrogen ratio average values of the time period and the previous time period is not greater than 0, the nitrous oxide carbon emission factor of the previous time period is added to the adjustment amplitude to serve as the calibrated nitrous oxide carbon emission factor of the time period.

[0072] In the conventional carbon emission factor accounting method, the carbon emission factor and the carbon emission amount are in a positive correlation relationship. If the difference between the carbon-nitrogen ratio average values is greater than 0, it indicates that the carbon source tends to be sufficient, the sewage treatment tank reaction is complete, N is mainly discharged in the form of nitrogen, and the carbon emission of nitrous oxide is reduced, so the carbon emission factor of nitrous oxide needs to be lowered; otherwise, it needs to be increased.

[0073] The adjustment amplitude is usually set to be 1%-5% of the nitrous oxide carbon emission factor of the first time period. This range ensures that the dynamic adjustment of the emission factor can effectively respond to significant changes in water quality parameters, and can prevent the accounting results from being distorted sharply between different time periods due to a large single adjustment amplitude. In this embodiment, 2% of the nitrous oxide carbon emission factor of the first time period is taken as the adjustment amplitude.

[0074] If only the second adjustment judgment rule is met, the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration and the distance between the average dissolved oxygen concentration of the previous time period and the standard range of dissolved oxygen concentration are calculated respectively. If the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration is greater than the distance between the previous time period and the standard range of dissolved oxygen concentration, at this time, the overall dissolved oxygen concentration deviates from the standard dissolved oxygen concentration relative to the previous time period, which is not conducive to the normal progress of the wastewater treatment reaction, leading to a decrease in the emission of nitrogen and an increase in the emission of nitrous oxide. Therefore, the nitrous oxide carbon emission factor of the previous time period is added to the adjustment range to serve as the calibrated nitrous oxide carbon emission factor of the time period. If the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration is less than the distance between the previous time period and the standard range of dissolved oxygen concentration, at this time, the overall dissolved oxygen concentration is close to the standard dissolved oxygen concentration relative to the previous time period, which is conducive to the normal progress of the wastewater treatment reaction, leading to an increase in the emission of nitrogen and a decrease in the emission of nitrous oxide. Therefore, the nitrous oxide carbon emission factor of the previous time period is subtracted by the adjustment range to serve as the calibrated nitrous oxide carbon emission factor of the time period. If the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration is equal to the distance between the previous time period and the standard range of dissolved oxygen concentration, it is considered that the above two situations are met at the same time, and the adjustment is offset. The nitrous oxide carbon emission factor of the previous time period is used as the calibrated nitrous oxide carbon emission factor of the time period.

[0075] If the average dissolved oxygen concentration of a time period is greater than the maximum value of the standard dissolved oxygen concentration, the average dissolved oxygen concentration of the time period is subtracted from the maximum value of the standard dissolved oxygen concentration to serve as the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration. If the average dissolved oxygen concentration of the time period is less than the minimum value of the standard dissolved oxygen concentration, the standard dissolved oxygen concentration is subtracted from the average dissolved oxygen concentration to serve as the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration. If the average dissolved oxygen concentration of the time period is within the range of the standard dissolved oxygen concentration, the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration is set to 0.

[0076] If the first adjustment judgment rule and the second adjustment judgment rule are met at the same time, and the difference between the average carbon-nitrogen ratio of the time period and the previous time period is greater than 0, the distance between the average dissolved oxygen concentration of the time period and the standard range of dissolved oxygen concentration is less than the distance between the previous time period and the standard range of dissolved oxygen concentration, at this time, the two factors that reduce nitrous oxide tend to reduce the carbon emission of nitrous oxide at the same time. The nitrous oxide carbon emission factor of the previous time period is subtracted by 2 times the adjustment range to serve as the calibrated nitrous oxide carbon emission factor of the time period.

[0077] If the first adjustment judgment rule and the second adjustment judgment rule are both satisfied, and the difference between the carbon-nitrogen ratio average of the time period and the carbon-nitrogen ratio average of the previous time period is not greater than 0, and the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is less than the distance between the dissolved oxygen concentration of the previous time period and the dissolved oxygen concentration standard range, then the carbon-nitrogen ratio provides a downward trend of the carbon emission factor of the nitrous oxide emission, and the dissolved oxygen concentration provides an upward trend of the carbon emission factor of the nitrous oxide emission. The absolute difference between the frequency domain dominant frequency of the carbon-nitrogen ratio of the time period and the frequency domain standard dominant frequency of the carbon-nitrogen ratio is calculated, denoted as the carbon-nitrogen ratio dominant frequency difference, and the absolute difference between the frequency domain dominant frequency of the dissolved oxygen concentration and the frequency domain standard dominant frequency of the dissolved oxygen concentration is calculated, denoted as the dissolved oxygen dominant frequency difference. The dominant frequency difference reflects the degree of deviation from the standard carbon emission pattern. The greater the degree of pattern deviation, the greater the adjustment trend. If the carbon-nitrogen ratio dominant frequency difference is greater than the dissolved oxygen dominant frequency difference, the adjustment is made according to the trend of the carbon-nitrogen ratio. Since the two effects cancel each other out, the adjustment intensity is halved. The subsequent adjustment is not described in detail. If the carbon-nitrogen ratio dominant frequency difference is less than the dissolved oxygen dominant frequency difference, the nitrous oxide carbon emission factor of the previous time period is added by 0.5 times the adjustment amplitude, and used as the nitrous oxide carbon emission factor of the time period. If the carbon-nitrogen ratio dominant frequency difference is equal to the dissolved oxygen dominant frequency difference, the nitrous oxide carbon emission factor of the previous time period is used as the calibrated nitrous oxide carbon emission factor of the time period.

[0078] If the first adjustment judgment rule and the second adjustment judgment rule are both satisfied, and the difference between the carbon-nitrogen ratio average of the time period and the carbon-nitrogen ratio average of the previous time period is greater than 0, and the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is greater than the distance between the dissolved oxygen concentration of the previous time period and the dissolved oxygen concentration standard range, then the carbon-nitrogen ratio provides a downward trend of the carbon emission factor of the nitrous oxide emission, and the dissolved oxygen concentration provides an upward trend of the carbon emission factor of the nitrous oxide emission. The absolute difference between the frequency domain dominant frequency of the carbon-nitrogen ratio of the time period and the frequency domain standard dominant frequency of the carbon-nitrogen ratio is calculated, denoted as the carbon-nitrogen ratio dominant frequency difference, and the absolute difference between the frequency domain dominant frequency of the dissolved oxygen concentration and the frequency domain standard dominant frequency of the dissolved oxygen concentration is calculated, denoted as the dissolved oxygen dominant frequency difference. The dominant frequency difference reflects the degree of deviation from the standard carbon emission pattern. The greater the degree of pattern deviation, the greater the adjustment trend. If the carbon-nitrogen ratio dominant frequency difference is greater than the dissolved oxygen dominant frequency difference, the adjustment is made according to the trend of the carbon-nitrogen ratio. Since the two effects cancel each other out, the adjustment intensity is halved. The subsequent adjustment is not described in detail. If the carbon-nitrogen ratio dominant frequency difference is less than the dissolved oxygen dominant frequency difference, the nitrous oxide carbon emission factor of the previous time period is added by 0.5 times the adjustment amplitude, and used as the nitrous oxide carbon emission factor of the time period. If the carbon-nitrogen ratio dominant frequency difference is equal to the dissolved oxygen dominant frequency difference, the nitrous oxide carbon emission factor of the previous time period is used as the calibrated nitrous oxide carbon emission factor of the time period.

[0079] If the first adjustment judgment rule and the second adjustment judgment rule are both satisfied, and the difference between the carbon-nitrogen ratio average of the time period and the carbon-nitrogen ratio average of the previous time period is not greater than 0, and the distance between the dissolved oxygen concentration average of the time period and the dissolved oxygen concentration standard range is less than the distance between the dissolved oxygen concentration of the previous time period and the dissolved oxygen concentration standard range, then the carbon-nitrogen ratio dominant frequency difference and the dissolved oxygen dominant frequency difference are calculated. If the carbon-nitrogen ratio dominant frequency difference is greater than the dissolved oxygen dominant frequency difference, the nitrous oxide carbon emission factor of the previous time period is added by 0.5 times the adjustment amplitude, and used as the nitrous oxide carbon emission factor of the time period. If the carbon-nitrogen ratio dominant frequency difference is less than the dissolved oxygen dominant frequency difference, the nitrous oxide carbon emission factor of the previous time period is subtracted by 0.5 times the adjustment amplitude, and used as the nitrous oxide carbon emission factor of the time period. If the carbon-nitrogen ratio dominant frequency difference is equal to the dissolved oxygen dominant frequency difference, the nitrous oxide carbon emission factor of the previous time period is used as the calibrated nitrous oxide carbon emission factor of the time period.

[0080] Step 4: Combine the nitrous oxide carbon emission factor of the first time period and the nitrous oxide carbon emission factor adjustment rule to obtain the calibrated nitrous oxide carbon emission factor of each time period, calculate the nitrous oxide emission of each sewage treatment facility based on the calibrated nitrous oxide carbon emission factor, and calculate the total nitrous oxide emission;

[0081] Further, based on the nitrous oxide carbon emission factor of each time period of each sewage treatment facility, the total nitrous oxide emission is calculated using the emission factor method; the total methane emission is directly calculated using the carbon emission factor method.

[0082] The total nitrous oxide emission calculated using the emission factor method is the prior art, specifically, for the total amount of treated water of each time period of the same sewage treatment facility, the calibrated nitrous oxide carbon emission factor, the influent nitrogen concentration and the effluent nitrogen concentration are calibrated; the formula for calculating the total nitrous oxide emission of the time period is:

[0083]

[0084] Wherein, is the carbon emission of nitrous oxide of the i th time period, is the calibrated carbon emission factor of nitrous oxide of the i th time period, is the total amount of treated water of the i th time period, is the influent nitrogen concentration of the i th time period, is the effluent nitrogen concentration of the i th time period, is the global warming potential of nitrous oxide;

[0085] The total carbon emission of nitrous oxide of all time periods of the sewage treatment is summed up to obtain the carbon emission of nitrous oxide of the sewage treatment facility, and the carbon emission of nitrous oxide of all sewage treatment facilities is summed up to obtain the total carbon emission of nitrous oxide,

[0086] In the running phase, for the same facility, a certain number of are randomly selected, and the actual nitrous oxide emission of the day is measured using the equipment for collecting the nitrous oxide emission of the first time period. In this embodiment, the nitrous oxide emission of the day calculated based on the calibrated nitrous oxide carbon emission factor, and the nitrous oxide emission of the day calculated using the conventional carbon emission factor method (always using the local standard nitrous oxide emission factor, without dynamic adjustment) are obtained. Please refer to Figure 2 , Figure 2 is the nitrous oxide emission comparison chart.

[0087] Step 5: Obtain the total methane emissions from the wastewater treatment facility, determine the direct carbon emissions by combining the total nitrous oxide emissions, obtain the indirect carbon emission data of the wastewater treatment facility, determine the indirect carbon emissions based on the indirect carbon emission data, and determine the carbon emissions of the wastewater treatment facility throughout its entire life cycle based on the direct and indirect carbon emissions.

[0088] The calculations of total methane emissions and indirect carbon emissions are based on existing technologies.

[0089] The standard methane carbon emission factor is obtained directly, and the total amount of organic matter removed by all wastewater treatment facilities is obtained. The total methane emission is calculated by multiplying the total amount of organic matter removed by all wastewater treatment facilities, the methane carbon emission factor, and the global warming potential of methane. The carbon dioxide emission during the operation phase is biogenic carbon dioxide and is not included in the total life cycle carbon emission.

[0090] Furthermore, the indirect carbon emission data includes carbon dioxide greenhouse gas emissions corresponding to the energy and resource consumption during the construction, operation, and demolition processes. These emissions are calculated using the carbon emission factor method, which is an existing technology. The total amount of energy and resources consumed can be obtained by multiplying the corresponding carbon emission factor, and will not be elaborated here.

[0091] Please see Figure 3 The present invention further provides a carbon emission lifecycle accounting device for decentralized rural wastewater treatment facilities. The device is used to implement the aforementioned carbon emission lifecycle accounting method for decentralized rural wastewater treatment facilities, specifically including:

[0092] The data acquisition module is used to acquire the time-series data of wastewater treatment for each rural wastewater treatment facility, including the time-series data of carbon-nitrogen ratio and dissolved oxygen concentration.

[0093] The data segmentation module is used to divide the total time of wastewater treatment time series data into multiple time intervals of equal time intervals, sort the time intervals according to the time sequence, and obtain the carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data corresponding to each time interval.

[0094] The feature extraction module is used to extract the direct and frequency domain features of each carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data, and set the nitrous oxide carbon emission factor adjustment rules based on the direct and frequency domain features;

[0095] The specialization calculation module is used to combine the nitrous oxide carbon emission factor of the first time period and the nitrous oxide carbon emission factor adjustment rules to obtain the calibrated nitrous oxide carbon emission factor for each time period, calculate the nitrous oxide emission of each wastewater treatment facility based on the calibrated nitrous oxide carbon emission factor, and calculate the total nitrous oxide emission.

[0096] The final accounting module is used to obtain the total methane emissions of the wastewater treatment facility, determine the direct carbon emissions by combining the total nitrous oxide emissions, obtain the indirect carbon emission data of the wastewater treatment facility, determine the indirect carbon emissions based on the indirect carbon emission data, and determine the carbon emissions of the wastewater treatment facility throughout its entire life cycle based on the direct and indirect carbon emissions.

[0097] The above formulas are all dimensionless calculations. The formulas are derived from software simulations based on a large amount of collected data to obtain the most recent real-world results. The preset parameters in the formulas are set by those skilled in the art according to the actual situation.

[0098] The above embodiments can be implemented, in whole or in part, by software, hardware, firmware, or any other combination thereof. When implemented in software, the above embodiments can be implemented, in whole or in part, as a computer program product. Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented by electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution.

[0099] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment, depending on actual needs.

[0100] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions that cannot be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application.

Claims

1. A method for accounting for carbon emissions in the life cycle of a decentralized rural wastewater treatment facility, characterized in that, The specific steps include: Step 1: Obtain sewage treatment time series data of each rural sewage treatment facility, the sewage treatment time series data including carbon-nitrogen ratio time series data and dissolved oxygen concentration time series data; Step 2: Divide the total time of the sewage treatment time series data into a plurality of equal time interval time periods, sort the time periods in chronological order, and obtain the carbon-nitrogen ratio sub-time series data and the dissolved oxygen concentration sub-time series data corresponding to each time period; Step 3: Extract the direct features and frequency domain features of each carbon-nitrogen ratio sub-time series data and dissolved oxygen concentration sub-time series data, and set the nitrous oxide carbon emission factor adjustment rule based on the direct features and frequency domain features; Step 4: Obtain the calibrated nitrous oxide carbon emission factor of each time period by combining the nitrous oxide carbon emission factor of the first time period and the nitrous oxide carbon emission factor adjustment rule, calculate the nitrous oxide emission of each sewage treatment facility based on the calibrated nitrous oxide carbon emission factor, and calculate the total nitrous oxide emission; Step 5: Obtain the total methane emission of the sewage treatment facility, determine the direct carbon emission by combining the total nitrous oxide emission, obtain the indirect carbon emission data of the sewage treatment facility, determine the indirect carbon emission based on the indirect carbon emission data, and determine the carbon emission of the sewage treatment facility in the whole life cycle based on the direct carbon emission and the indirect carbon emission; The direct feature of the carbon-nitrogen ratio sub-time series data is the carbon-nitrogen ratio mean value, the direct feature of the dissolved oxygen concentration sub-time series data is the dissolved oxygen concentration mean value, the frequency domain feature of the carbon-nitrogen ratio sub-time series data is the carbon-nitrogen ratio frequency domain main frequency, and the frequency domain feature of the dissolved oxygen concentration sub-time series data is the dissolved oxygen concentration frequency domain main frequency. The carbon-nitrogen ratio frequency domain main frequency and the dissolved oxygen concentration frequency domain main frequency of the first time period are referred to as the carbon-nitrogen ratio frequency domain standard main frequency and the dissolved oxygen concentration frequency domain standard main frequency; The nitrous oxide carbon emission factor adjustment rule includes adjustment judgment rule and adjustment implementation rule; For any time period other than the first time period, if the time period meets the adjustment judgment rule, the adjustment implementation rule is used to adjust the nitrous oxide carbon emission factor of the previous time period, and the adjusted nitrous oxide carbon emission factor is used as the calibrated nitrous oxide carbon emission factor of the time period; If the adjustment judgment rule is not met, the nitrous oxide carbon emission factor of the previous time period is directly used as the calibrated nitrous oxide carbon emission factor of the time period; For the first time period, the nitrous oxide carbon emission factor is used as the calibrated nitrous oxide carbon emission factor; For any time period other than the first time period, the absolute difference value of the carbon-nitrogen ratio mean value and the absolute difference value of the dissolved oxygen concentration mean value of the time period and the previous time period are calculated, the carbon-nitrogen ratio absolute difference value threshold and the dissolved oxygen concentration absolute difference value threshold are set, the adjustment judgment rule includes the first adjustment judgment rule and the second adjustment judgment rule, and meeting one of the first adjustment judgment rule and the second adjustment judgment rule is regarded as meeting the adjustment judgment rule; The preset carbon-nitrogen ratio threshold and dissolved oxygen concentration standard range are set. The first adjustment judgment rule is that the average carbon-nitrogen ratio of at least one of the time period and the previous time period is less than a carbon-nitrogen ratio threshold value, and the absolute difference of the average carbon-nitrogen ratio is greater than a carbon-nitrogen ratio absolute difference threshold value; The second adjustment judgment rule is that the average dissolved oxygen concentration of at least one of the time period and the previous time period is not within a dissolved oxygen concentration standard range, and the absolute difference of the average dissolved oxygen concentration is greater than a dissolved oxygen concentration absolute difference threshold value.

2. The method according to claim 1, wherein: The preset adjustment amplitude is used to implement the adjustment implementation rule, and specifically: If only the first adjustment rule or the second adjustment rule is met, the calibrated nitrous oxide carbon emission factor of the time period is obtained by adjusting the nitrous oxide carbon emission factor of the previous time period by an integer multiple of the adjustment amplitude as a gradient; If the first adjustment judgment rule and the second adjustment judgment rule are both met, and when the difference between the average carbon-nitrogen ratio of the time period and the previous time period is greater than 0, and the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen concentration standard range is less than the distance between the average dissolved oxygen concentration of the previous time period and the dissolved oxygen concentration standard range, or when the average carbon-nitrogen ratio of the time period and the previous time period is not greater than 0, the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen concentration standard range is greater than the distance between the average dissolved oxygen concentration of the previous time period and the dissolved oxygen concentration standard range, the calibrated nitrous oxide carbon emission factor of the time period is obtained by adjusting the nitrous oxide carbon emission factor of the previous time period by an integer multiple of the adjustment amplitude as a gradient; If the first adjustment judgment rule and the second adjustment judgment rule are both met, and the difference between the average carbon-nitrogen ratio of the time period and the previous time period is greater than 0, and the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen concentration standard range is greater than the distance between the average dissolved oxygen concentration of the previous time period and the dissolved oxygen concentration standard range, or if the first adjustment judgment rule and the second adjustment judgment rule are both met, and the difference between the average carbon-nitrogen ratio of the time period and the previous time period is not greater than 0, the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen concentration standard range is less than the distance between the average dissolved oxygen concentration of the previous time period and the dissolved oxygen concentration standard range, the calibrated nitrous oxide carbon emission factor of the time period is obtained by adjusting the nitrous oxide carbon emission factor of the previous time period by a multiple less than 1 of the adjustment amplitude as a gradient.

3. The method according to claim 2, wherein: The logic of adjusting by an integer multiple of the adjustment amplitude is as follows: If only the first adjustment judgment rule is met, and when the difference between the average carbon-nitrogen ratio of the time period and the previous time period is greater than 0, the calibrated nitrous oxide carbon emission factor of the time period is obtained by subtracting the adjustment amplitude from the nitrous oxide carbon emission factor of the previous time period; when the difference between the average carbon-nitrogen ratio of the time period and the previous time period is not greater than 0, the calibrated nitrous oxide carbon emission factor of the time period is obtained by adding the adjustment amplitude to the nitrous oxide carbon emission factor of the previous time period; If only the second adjustment judgment rule is satisfied, the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen standard range and the distance between the average dissolved oxygen concentration of the previous time period and the dissolved oxygen standard range are calculated respectively, if the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen standard range is greater than the distance between the previous time period and the dissolved oxygen standard range, the nitrous oxide carbon emission factor of the previous time period is added to the adjustment amplitude to be used as the calibrated nitrous oxide carbon emission factor of the time period; if the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen standard range is less than the distance between the previous time period and the dissolved oxygen standard range, the nitrous oxide carbon emission factor of the previous time period is subtracted from the adjustment amplitude to be used as the calibrated nitrous oxide carbon emission factor of the time period; if the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen standard range is equal to the distance between the previous time period and the dissolved oxygen standard range, the nitrous oxide carbon emission factor of the previous time period is used as the calibrated nitrous oxide carbon emission factor of the time period; If the first adjustment judgment rule and the second adjustment judgment rule are satisfied at the same time, and when the difference between the average carbon-nitrogen ratio of the time period and the previous time period is greater than 0, if the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen standard range is less than the distance between the previous time period and the dissolved oxygen standard range, the nitrous oxide carbon emission factor of the previous time period is subtracted by 2 times the adjustment amplitude to be used as the calibrated nitrous oxide carbon emission factor of the time period; If the first adjustment judgment rule and the second adjustment judgment rule are satisfied at the same time, and when the average carbon-nitrogen ratio of the time period and the previous time period is not greater than 0, the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen standard range is greater than the distance between the previous time period and the dissolved oxygen standard range, the nitrous oxide carbon emission factor of the previous time period is added to 2 times the adjustment amplitude to be used as the calibrated nitrous oxide carbon emission factor of the time period.

4. The method according to claim 3, wherein: The logic of adjusting by a multiple smaller than 1 of the adjustment amplitude is: If the first adjustment judgment rule and the second adjustment judgment rule are satisfied at the same time, and the difference between the average carbon-nitrogen ratio of the time period and the previous time period is greater than 0, the distance between the average dissolved oxygen concentration of the time period and the dissolved oxygen standard range is greater than the distance between the previous time period and the dissolved oxygen standard range, the absolute difference between the frequency domain main frequency of the carbon-nitrogen ratio of the time period and the carbon-nitrogen ratio frequency domain standard main frequency is calculated, which is recorded as the carbon-nitrogen ratio main frequency difference, and the absolute difference between the frequency domain main frequency of the dissolved oxygen concentration and the dissolved oxygen concentration frequency domain standard main frequency is recorded as the dissolved oxygen main frequency difference, if the carbon-nitrogen ratio main frequency difference is greater than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the previous time period is subtracted by 0.5 times the adjustment amplitude, and is used as the nitrous oxide carbon emission factor of the time period, if the carbon-nitrogen ratio main frequency difference is less than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the previous time period is added to 0.5 times the adjustment amplitude, and is used as the nitrous oxide carbon emission factor of the time period; if the carbon-nitrogen ratio main frequency difference is equal to the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the previous time period is used as the calibrated nitrous oxide carbon emission factor of the time period; If the first adjustment judgment rule and the second adjustment judgment rule are both satisfied, the difference between the average carbon-nitrogen ratio of the time period and the average carbon-nitrogen ratio of the previous time period is not greater than 0, the distance between the average dissolved oxygen concentration of the time period and the standard range of the dissolved oxygen concentration is less than the distance between the average dissolved oxygen concentration of the previous time period and the standard range of the dissolved oxygen concentration, the carbon-nitrogen ratio main frequency difference and the dissolved oxygen main frequency difference are calculated, if the carbon-nitrogen ratio main frequency difference is greater than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the previous time period is added by 0.5 times the adjustment amplitude and used as the nitrous oxide carbon emission factor of the time period, if the carbon-nitrogen ratio main frequency difference is less than the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the previous time period is subtracted by 0.5 times the adjustment amplitude and used as the nitrous oxide carbon emission factor of the time period, and if the carbon-nitrogen ratio main frequency difference is equal to the dissolved oxygen main frequency difference, the nitrous oxide carbon emission factor of the previous time period is used as the calibrated nitrous oxide carbon emission factor of the time period.

5. The method according to claim 4, wherein: Based on the nitrous oxide carbon emission factor of each time period of each sewage treatment facility, the total amount of nitrous oxide emission is calculated by using the emission factor method, and the total amount of methane emission is directly calculated by using the carbon emission factor method.

6. The method according to claim 1, wherein: The indirect carbon emission data includes carbon dioxide greenhouse gas emission corresponding to energy and resource consumption in the construction, operation and demolition processes, and is calculated by using the carbon emission factor method.

7. A device for accounting carbon emissions of a full life cycle of a distributed rural sewage treatment facility, characterized in that: The device is used to implement the distributed rural sewage treatment facility carbon emission life cycle accounting method of any one of claims 1-6, and specifically comprises: a data acquisition module configured to acquire sewage treatment time sequence data of each rural sewage treatment facility, wherein the sewage treatment time sequence data includes carbon-nitrogen ratio time sequence data and dissolved oxygen concentration time sequence data; a data segmentation module configured to divide the total time of the sewage treatment time sequence data into a plurality of time periods with equal time intervals, sort the time periods according to time sequence, and acquire carbon-nitrogen ratio sub-time sequence data and dissolved oxygen concentration sub-time sequence data corresponding to each time period; a feature extraction module configured to extract direct features and frequency domain features of each carbon-nitrogen ratio sub-time sequence data and dissolved oxygen concentration sub-time sequence data, and set nitrous oxide carbon emission factor adjustment rules based on the direct features and the frequency domain features; a specialized operation module configured to acquire a calibrated nitrous oxide carbon emission factor of each time period by combining the nitrous oxide carbon emission factor of the first time period and the nitrous oxide carbon emission factor adjustment rules, calculate the amount of nitrous oxide emission of each sewage treatment facility based on the calibrated nitrous oxide carbon emission factor, and calculate the total amount of nitrous oxide emission; a final accounting module configured to acquire the total amount of methane emission of the sewage treatment facility, determine the direct carbon emission amount in combination with the total amount of nitrous oxide emission, acquire indirect carbon emission data of the sewage treatment facility, determine the indirect carbon emission amount based on the indirect carbon emission data, and determine the carbon emission amount of the sewage treatment facility in the whole life cycle based on the direct carbon emission amount and the indirect carbon emission amount.

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