CN115587478A - Pollutant removal amount-based greenhouse gas emission accounting method for sewage treatment plant - Google Patents
Pollutant removal amount-based greenhouse gas emission accounting method for sewage treatment plant Download PDFInfo
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- 239000010865 sewage Substances 0.000 title claims abstract description 243
- 239000003344 environmental pollutant Substances 0.000 title claims abstract description 122
- 231100000719 pollutant Toxicity 0.000 title claims abstract description 122
- 238000000034 method Methods 0.000 title claims abstract description 72
- 239000005431 greenhouse gas Substances 0.000 title claims abstract description 41
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 68
- 230000008569 process Effects 0.000 claims abstract description 36
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- 230000003203 everyday effect Effects 0.000 claims description 11
- 238000012544 monitoring process Methods 0.000 claims description 10
- 238000011835 investigation Methods 0.000 claims description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052799 carbon Inorganic materials 0.000 abstract description 4
- 238000006386 neutralization reaction Methods 0.000 abstract description 4
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 230000009467 reduction Effects 0.000 abstract description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 10
- 238000004065 wastewater treatment Methods 0.000 description 8
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 description 6
- 239000010841 municipal wastewater Substances 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000005273 aeration Methods 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 3
- 239000001272 nitrous oxide Substances 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000007254 oxidation reaction Methods 0.000 description 3
- 239000010802 sludge Substances 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 239000010840 domestic wastewater Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 230000001590 oxidative effect Effects 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
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- 230000006870 function Effects 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 125000001477 organic nitrogen group Chemical group 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000012163 sequencing technique Methods 0.000 description 1
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Abstract
The invention relates to a method for accounting greenhouse gas emission of national urban sewage treatment plants based on pollutant removal amount, which comprises the following steps: establishing a national town sewage plant basic information database based on publicly released data; calculating to obtain the annual total removal amount of pollutants in national urban sewage treatment plants; calculating to obtain the total removal amount of pollutants in the urban sewage treatment plant of each province; establishing a linear correlation relationship between the pollutant removal amount of the sewage treatment plant and the designed treated water amount of the sewage treatment plant; then calculating to obtain the pollutant removal amount of each sewage treatment plant; and calculating the direct greenhouse gas emission amount of the sewage treatment plant corresponding to the sewage treatment process by using an emission factor method. The method is beneficial to implementing corresponding management and emission reduction measures for the sewage treatment plant, and provides data service and technical support for the carbon neutralization way of the sewage treatment plant.
Description
Technical Field
The invention relates to a pollutant removal amount-based greenhouse gas emission accounting method for sewage treatment plants, in particular to a method for calculating direct greenhouse gas emission of sewage treatment plants in cities and towns nationwide based on specific processes of the sewage treatment plants.
Background
In recent years, china proposes a carbon neutralization prospective target. As an important component of greenhouse gas emission, the accounting technology of greenhouse gas emission of sewage treatment plants needs to be perfected urgently. At present, the calculation of greenhouse gas emission of a sewage treatment plant is mostly directly estimated by using an IPCC (internet protocol chip carrier) method, generally aiming at the national scale, and parameter values are basically recommended values judged by foreign experts. Therefore, the method has poor applicability and has large uncertainty. In order to more accurately calculate the direct emission of greenhouse gases from sewage treatment plants, it is necessary to calculate the emission of greenhouse gases from each sewage treatment plant according to a specific process.
Disclosure of Invention
The invention provides a pollutant removal amount-based greenhouse gas emission accounting method for a sewage treatment plant, and aims to at least solve one of the technical problems in the prior art.
The technical scheme of the invention relates to a pollutant removal amount-based greenhouse gas emission accounting method for a sewage treatment plant, which comprises the following steps:
s100, establishing a national sewage plant basic information database based on publicly released data;
s200, obtaining the total pollutant removal amount of the national-scale centralized sewage treatment facilities, and combining the proportion of the national-scale domestic sewage treatment amount in the total pollutant treatment amount to obtain the national-scale annual pollutant removal amount of the urban sewage treatment plant;
s300, obtaining the percentage of the pollutant removal amount of the sewage treatment plant of each province and town in the total pollutant removal amount of the urban sewage treatment plant nationwide, and combining the annual pollutant removal total amount of the urban sewage treatment plant nationwide to obtain the total pollutant removal amount of the sewage treatment plant of each province and town;
s400, acquiring inlet water and outlet water monitoring data of a sewage treatment plant corresponding to at least one provincial region, acquiring the annual pollutant removal amount of each sewage treatment plant in the provincial region according to the pollutant concentration of the inlet water and the outlet water, and acquiring the linear positive correlation relationship between the annual pollutant removal amount of the sewage treatment plant corresponding to the provincial region and the designed treated water amount by combining the designed treated water amount which can be accommodated by the sewage treatment plant every day;
s500, distributing the total removal amount of the pollutants of the urban sewage treatment plants to each sewage treatment plant within the urban area of the province by combining the designed treatment water amount which can be contained by the sewage treatment plant every day to obtain the removal amount of the pollutants of a single sewage treatment plant;
s600, classifying the sewage treatment processes in the sewage plant basic information database, obtaining greenhouse gas emission factors of corresponding processes through investigation, and calculating direct greenhouse gas emission of the sewage treatment plant corresponding to the sewage treatment processes through an emission factor method.
Further, the step S100 includes: the basic information database of the sewage plant comprises the name, the geographical position, the commissioning time, the treatment process and the water quality indexes of inlet and outlet water of the sewage plant.
Further, the step S200 includes: and calculating the annual total removal amount of the pollutants of the urban sewage treatment plants in the national range according to the following formula, wherein Z = Y multiplied by w, wherein Z is the annual total removal amount of the pollutants of the urban sewage treatment plants in the national range, Y is the total removal amount of the pollutants of the sewage centralized treatment facilities in the national range, and w is the ratio of the national domestic sewage treatment amount to the total sewage treatment amount.
Further, the step S300 includes: calculating the total removal amount of pollutants, C, of the urban sewage treatment plants in each province according to the following formula T = Z × U wherein, C T The total pollutant removal amount of the town sewage treatment plants of each province, Z is the annual total pollutant removal amount of the town sewage treatment plants nationwide, and U is the ratio of the pollutant removal amount of the town sewage treatment plants of each province to the total pollutant removal amount of the town sewage treatment plants nationwide.
Further, the step S400 includes: the annual pollutant removal amount of each sewage treatment plant in the provincial region was calculated according to the following formula, L = F × (C) in -C out )*365*10 -6 Wherein L is an annual pollutant removal amount of a sewage treatment plant of the provincial region, and F is designed treated water which can be accommodated by the sewage treatment plant every dayAmount, C in 、C out And the data are respectively the monitoring data of the pollutants of the water inlet and the water outlet of the sewage treatment plant corresponding to provincial regions.
Further, the step S500 includes: calculating the pollutant removal amount of the single sewage treatment plant according to the following formula,
wherein A is the pollutant removal amount of a single sewage treatment plant, F is the designed treatment water amount that the sewage treatment plant can accommodate per day, C T The total removal amount of pollutants in the urban sewage treatment plants of each province, and M is the total designed treatment water amount of the province where a single sewage treatment plant is located.
Further, the step S600 includes: and classifying the sewage treatment processes into more than one type according to the specific treatment process information in the sewage plant basic information database.
Further, the step S600 includes: calculating the direct emission amount E of greenhouse gases of the sewage treatment plant by an emission factor method according to the following formula i ＝A i ×EF i Wherein i is a greenhouse gas; e is greenhouse gas emission; a is activity level; EF is the emission factor.
Further, the pollutants of urban sewage treatment plants in various provinces comprise COD and TN.
The invention has the following beneficial effects.
The greenhouse gas emission accounting method for the sewage treatment plant based on the pollutant removal amount is beneficial to implementing corresponding management and emission reduction measures for the sewage treatment plant through accurately calculating the direct greenhouse gas emission of the sewage treatment plant in cities and towns in China, and provides data service and technical support for the carbon neutralization way of the sewage treatment plant.
Drawings
FIG. 1 is a general flow chart of a pollutant removal amount-based greenhouse gas emission accounting method for a sewage treatment plant according to the method of the present invention.
Fig. 2 is a schematic view of COD removal amount of each sewage treatment plant according to an embodiment of the present invention.
Fig. 3 is a schematic diagram of TN removal at each sewage treatment plant in an embodiment according to the present invention.
FIG. 4 is a graph showing the relationship between the amount of treated water and the amount of COD removed in each sewage plant in Zhejiang province according to the embodiment of the present invention.
FIG. 5 is a graph showing the relationship between the amount of treated water and the total nitrogen removal amount designed for each wastewater treatment plant in Zhejiang province according to the embodiment of the present invention.
FIG. 6 is a schematic view of a classification of a sewage treatment process according to an embodiment of the present invention.
Detailed Description
The conception, the specific structure and the technical effects of the present invention will be clearly and completely described in conjunction with the embodiments and the accompanying drawings to fully understand the objects, the schemes and the effects of the present invention.
It should be noted that, unless otherwise specified, when a feature is referred to as being "fixed" or "connected" to another feature, it can be directly fixed or connected to the other feature or indirectly fixed or connected to the other feature. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. Furthermore, unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in the description herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any combination of one or more of the associated listed items.
It will be understood that, although the terms first, second, third, etc. may be used herein to describe various elements, these elements should not be limited by these terms. These terms are only used to distinguish one element of the same type from another. For example, a first element could be termed a second element, and, similarly, a second element could be termed a first element, without departing from the scope of the present disclosure. The use of any and all examples, or exemplary language ("e.g.," such as "or the like") provided herein, is intended merely to better illuminate embodiments of the invention and does not pose a limitation on the scope of the invention unless otherwise claimed.
Referring to fig. 1 to 6, in some embodiments, the present invention discloses a pollutant removal amount-based greenhouse gas emission accounting method for a sewage treatment plant, which, referring to fig. 1, includes the steps of:
s100, establishing a national sewage plant basic information database based on publicly released data;
s200, obtaining the total pollutant removal amount of the national sewage centralized treatment facilities, and obtaining the total annual pollutant removal amount of the national urban sewage treatment plants by combining the ratio of the national domestic sewage treatment amount to the total sewage treatment amount;
s300, obtaining the percentage of the pollutant removal amount of the sewage treatment plant of each province and town in the total pollutant removal amount of the urban sewage treatment plant nationwide, and combining the annual pollutant removal total amount of the urban sewage treatment plant nationwide to obtain the total pollutant removal amount of the sewage treatment plant of each province and town;
s400, acquiring monitoring data of inlet water and outlet water of the sewage treatment plants corresponding to at least one provincial region, acquiring annual pollutant removal amount of each sewage treatment plant in the provincial region according to the pollutant concentration of the inlet water and the outlet water, and acquiring a linear positive correlation relation between the annual pollutant removal amount and the designed treated water amount of the sewage treatment plants corresponding to the provincial region by combining the designed treated water amount which can be contained by the sewage treatment plants every day;
s500, distributing the total removal amount of the pollutants of the urban sewage treatment plants to each sewage treatment plant within the urban area of the province by combining the designed treatment water amount which can be contained by the sewage treatment plant every day to obtain the removal amount of the pollutants of a single sewage treatment plant;
s600, classifying the sewage treatment processes in the sewage plant basic information database, obtaining greenhouse gas emission factors of corresponding processes through investigation, and calculating direct greenhouse gas emission of the sewage treatment plant corresponding to the sewage treatment processes through an emission factor method.
According to the pollutant removal amount-based greenhouse gas emission accounting method for the sewage treatment plant, the direct greenhouse gas emission amount of the sewage treatment plants in cities and towns in China is accurately calculated, so that corresponding management and emission reduction measures are favorably implemented for the sewage treatment plants, and data service and technical support are provided for carbon neutralization ways of the sewage treatment plants.
Detailed description of step S100 (Collection of basic information of Sewage plant)
S100, establishing a national sewage plant basic information database based on publicly released data. The national sewage plant basic information database is established mainly based on data published by government through screening, supplementing and matching of multi-source data. The basic information database of the sewage plant comprises the name, the geographical position, the commissioning time, the treatment process and the water quality indexes of inlet and outlet water of the sewage plant.
Detailed description of the step S200 (method for calculating the total amount of pollutants removed in municipal wastewater treatment plants of the nation)
S200, firstly, acquiring the total pollutant (including COD and TN) removal amount of the sewage centralized treatment facility nationwide based on government public data; next, assuming that the removal amount of pollutants in the municipal wastewater treatment plant nationwide is in direct proportion to the treatment amount of wastewater (domestic wastewater) in the municipal wastewater treatment plant, the total removal amount of pollutants in the municipal wastewater treatment plant nationwide is calculated according to the proportion of the treatment amount of the domestic wastewater nationwide published by the ministry of ecological environment in the total treatment amount of the wastewater. The annual pollutant removal total amount of the urban sewage treatment plants across the country is obtained according to the following formula:
Z＝Y×w
wherein Z is the total annual pollutant removal amount (t) of the national urban sewage treatment plants, Y is the total pollutant removal amount (t) of the national sewage centralized treatment facilities, and w is the ratio of the national domestic sewage treatment amount to the total sewage treatment amount.
Further explained, the treatment objects of the national sewage centralized treatment facility mainly comprise industrial sewage and domestic sewage, and the urban sewage treatment plant mainly treats the domestic sewage.
COD is the chemical oxygen demand, is the amount of oxidant consumed when a water sample is treated by a certain strong oxidant under a certain condition, reflects the degree of pollution of reducing substances in water, and is also used as one of comprehensive indexes of relative content of organic matters;
TN, total nitrogen, is the total amount of various forms of inorganic and organic nitrogen in water and is often used to indicate the degree of nutrient contamination of water.
The detailed implementation manner of the step S300 (calculation method of total pollutant removal amount of each provincial town sewage treatment plant)
S300, obtaining the ratio of the pollutant removal amount of each provincial town sewage treatment plant in the total pollutant removal amount of the nationwide town sewage treatment plants based on government published data, and referring to figures 2 to 3, combining the annual total pollutant removal amount of the nationwide town sewage treatment plants (including COD and TN) to obtain the total pollutant removal amount of each provincial town sewage treatment plant. And calculating the total removal amount of the pollutants of the town sewage treatment plants of each province according to the following formula:
C T ＝Z×U
wherein, C T The total pollutant removal amount (t) of each province of urban sewage treatment plants, Z is the total annual pollutant removal amount (t) of the urban sewage treatment plants nationwide, and U is the percentage of the total pollutant removal amount (t) of the urban sewage treatment plants nationwide.
The detailed embodiment of step S400 (determination of the linear correlation between the amount of pollutants removed in each wastewater treatment plant and the amount of wastewater treatment plant' S designed amount of treated water)
S400, acquiring monitoring data of inlet water and outlet water of the sewage treatment plants corresponding to at least one provincial region, acquiring annual pollutant removal amount of each sewage treatment plant in the provincial region according to the pollutant concentration of the inlet water and the outlet water, and acquiring a linear positive correlation relation between the annual pollutant removal amount and the designed treated water amount of the sewage treatment plants corresponding to the provincial region by combining the designed treated water amount which can be contained by the sewage treatment plants every day.
Referring to fig. 4 to 5, taking the monitoring data of the pollutants in the inlet water and the outlet water of each sewage treatment plant in zhejiang and guangdong as an example, the COD concentration and TN concentration of the inlet water and the outlet water of the sewage treatment plant and the designed treated water amount which can be accommodated by the sewage treatment plant every day are taken as the basis. Then drawing a relation graph of the pollutant removal amount and the designed treatment capacity of each sewage treatment plant, respectively establishing linear equations of the COD removal amount and the TN removal amount of the sewage treatment plant and the designed treatment capacity of the sewage treatment plant, and determining the correlation between the pollutant removal amount of the sewage treatment plant and the designed treatment capacity of the sewage treatment plant; the two are in a linear positive correlation relationship, namely the larger the design flow is, the larger the removal amount of COD and TN is.
Therefore, the annual pollutant removal amount of each sewage treatment plant in the provincial region is calculated according to the following formula:
l＝F×(C in -C out )*365*10 -6
wherein L is an annual pollutant removal amount (t) of each sewage treatment plant in the provincial region, and F is a design treatment water amount (m) that the sewage treatment plant can accommodate per day 3 /d)，C in 、C out Respectively monitoring the water inlet and outlet pollutants (mg/L) of each sewage treatment plant in province areas.
Detailed description of the step S500 (calculation method of pollutant removal amount in urban Sewage treatment plant)
And S500, distributing the total removal amount of the pollutants of the urban sewage treatment plants to each sewage treatment plant within the urban area of the province by combining the designed treatment water amount which can be contained by the sewage treatment plant every day, so as to obtain the removal amount of the pollutants of the single sewage treatment plant.
The pollutant removal amount of each sewage treatment plant in the step has a linear correlation relationship with the designed treatment capacity of the sewage treatment plant, namely, the ratio of the pollutant removal amount in the total-provincial pollutant removal amount is considered to be equal to the ratio of the designed treatment capacity (the designed treatment water amount which can be accommodated by the sewage treatment plant every day) in the total designed treatment capacity of the total-provincial sewage treatment plant, and based on the ratio, the total removal amount of COD and TN in the total provincial sewage treatment plant is distributed to each sewage treatment plant.
And calculating the pollutant removal amount of the single sewage treatment plant according to the following formula:
wherein A is a pollutant removal amount (t) of a single sewage treatment plant, and F is a designed treatment water amount (m) that the sewage treatment plant can accommodate per day 3 /d)，C T Is the total pollutant removal amount (t) of the urban sewage treatment plants in each province, and M is the total designed treatment water amount (M) of the province where a single sewage treatment plant is located 3 /d)。
Concrete implementation of step S600 (calculation of direct emission of greenhouse gases from various municipal wastewater treatment plants)
S600, classifying the sewage treatment processes in the sewage plant basic information database, obtaining greenhouse gas emission factors of corresponding processes through investigation, and calculating direct greenhouse gas emission of the sewage treatment plant corresponding to the sewage treatment processes through an emission factor method.
Step S600 further breaks down the following steps:
and S610, classifying the sewage treatment processes into more than one type according to the specific treatment process information in the basic information database of the sewage plant.
Referring to fig. 6 as an example, in a national sewage plant basic information database, a specific process of taking the first four of the database in ranking includes: the remaining processes are less in proportion and are classified into other processes, such as the classification table shown in the attached figure 6:
with reference to fig. 5, there is the following noun explanation: AAO (anaerobic-anoxic-aerobic process) is a commonly used sewage treatment process and has good denitrification and dephosphorization effects; AO (anaerobic-aerobic process), wherein the anaerobic section is used for removing nitrogen and phosphorus, and the aerobic section is used for removing organic matters in water; SBR (sequencing batch reactor) is an activated sludge sewage treatment technology which operates in an intermittent aeration mode; the oxidation ditch is an activated sludge treatment system, and an aeration tank of the oxidation ditch is in a closed ditch shape, so the oxidation ditch is different from a traditional activated sludge method in the hydraulic flow state and is a circulating flow aeration ditch which is connected end to end.
S620, obtaining emission factors by searching greenhouse gas emission factors (including methane and nitrous oxide) of related processes in the existing literature.
S630, calculating the direct greenhouse gas emission amount of each sewage treatment plant according to the following formula by using an emission factor method:
E i ＝A i ×EF i
wherein i is a greenhouse gas; e is greenhouse gas emission; a is activity level; EF is the emission factor.
Wherein, the activity level refers to the amount of human activity that produces greenhouse gas emissions or eliminates in a defined area during a particular period of time; the emission factor is a coefficient corresponding to the activity level data for quantifying the amount of greenhouse gas emission per unit activity level.
The amount of methane and nitrous oxide discharged from 2011 national town sewage treatment plants is calculated by taking 2011 data as an example.
S100, on the basis of a name list of a sewage treatment plant published by the government, matching the data such as commissioning time, process types and the like obtained on the network by using a VLOOKUP function in Excel software according to the name of the sewage treatment plant, and establishing a nationwide sewage plant basic information database.
S200, taking 2011 as an example, in 2011 government published data, the total removal amount of pollutants (COD) of a national sewage centralized treatment facility is 10149000t, and the ratio of the national domestic sewage treatment amount to the total sewage treatment amount is 0.868. And (3) calculating the annual removal total quantity Z = Y x w =10149000 x 0.868=8809332t of pollutants (COD) of the national town sewage treatment plant in 2011 according to a formula.
S300, taking Guangdong province as an example, the percentage of the removal amount of pollutants (COD) in the urban sewage treatment plant in 2011 (Guangdong province) in the total removal amount of pollutants (COD) in urban sewage treatment plants nationwide is 9.62%. Therefore, 2011 (Guangdong province) total pollutant removal amount C of urban sewage treatment plant T ＝Z×U＝8809332*9.62％＝847458t。
S400, taking a certain sewage treatment plant in Zhejiang province as an example, the designed treated water amount which can be contained by the sewage treatment plant every day is 50000m 3 D, sewage treatmentIf the monitoring data (COD concentration) of the influent water of the treatment plant is 272mg/L and the monitoring data (COD concentration) of the effluent water of the sewage treatment plant is 8mg/L, the annual pollutant removal amount (COD) of the sewage treatment plant in the area (Zhejiang province) is L = F × (C × ( in -C out )*365*10 -6 ＝50000*(272-8)*10 -6 *365=4818t. The method is repeated, the (COD) annual pollutant removal amount of all sewage treatment plants in Zhejiang province is calculated, the COD removal amount of each sewage treatment plant is taken as the abscissa, the treatment capacity is designed as the ordinate, and the correlation is analyzed by using Origin software for linear fitting.
S500, taking a certain sewage treatment plant in Guangdong province as an example, the water treatment plant is designed to treat water with the volume of 100000m 3 (d) the total designed treated water amount of the province where the sewage treatment plant is located (Guangdong province) is 23629530m 3 and/D, the total pollutant removal amount of the urban sewage treatment plant in 2011 (Guangdong province) is 847458t, and the pollutant (C0D) removal amount of a single sewage treatment plant distributed by the sewage treatment plant in 2011
S600, classifying the sewage treatment processes in the basic information database of the sewage plant to obtain that the sewage treatment process adopted by the sewage treatment plant in the step S500 is AA0, the methane emission factor corresponding to the AAO treatment process is 0.0034kgCH4/kg (COD), and the methane emission of the sewage treatment plant in 2011 is E = A i ×EF i =0.0034 × 3586=12.2t. Based on the method, the discharge amount of methane and nitrous oxide of sewage treatment plants in cities and towns nationwide in the year is calculated respectively.
The above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiment, and any modifications, equivalent substitutions, improvements, etc. within the spirit and principle of the present invention should be included in the protection scope of the present invention as long as the technical effects of the present invention are achieved by the same means. The invention is capable of other modifications and variations in its technical solution and/or its implementation, within the scope of protection of the invention.
Claims (9)
1. A pollutant removal amount-based greenhouse gas emission accounting method for a sewage treatment plant, characterized by comprising the steps of:
s100, establishing a nationwide sewage plant basic information database based on publicly released data;
s200, obtaining the total pollutant removal amount of the national-scale centralized sewage treatment facilities, and combining the proportion of the national-scale domestic sewage treatment amount in the total pollutant treatment amount to obtain the national-scale annual pollutant removal amount of the urban sewage treatment plant;
s300, obtaining the percentage of the pollutant removal amount of the sewage treatment plant of each province and town in the total pollutant removal amount of the urban sewage treatment plant nationwide, and combining the annual pollutant removal total amount of the urban sewage treatment plant nationwide to obtain the total pollutant removal amount of the sewage treatment plant of each province and town;
s400, acquiring inlet water and outlet water monitoring data of a sewage treatment plant corresponding to at least one provincial region, acquiring the annual pollutant removal amount of each sewage treatment plant in the provincial region according to the pollutant concentration of the inlet water and the outlet water, and acquiring the linear positive correlation relationship between the annual pollutant removal amount of the sewage treatment plant corresponding to the provincial region and the designed treated water amount by combining the designed treated water amount which can be accommodated by the sewage treatment plant every day;
s500, distributing the total removal amount of the pollutants of the urban sewage treatment plants to each sewage treatment plant within the urban area of the province by combining the designed treatment water amount which can be contained by the sewage treatment plant every day to obtain the removal amount of the pollutants of a single sewage treatment plant;
s600, classifying the sewage treatment processes in the sewage plant basic information database, obtaining greenhouse gas emission factors of corresponding processes through investigation, and calculating direct greenhouse gas emission of the sewage treatment plant corresponding to the sewage treatment processes through an emission factor method.
2. The method of claim 1, wherein the step S100 comprises:
the sewage plant basic information database comprises names, geographical positions, commissioning time, treatment processes and water inlet and outlet quality indexes of sewage plants.
3. The method of claim 1, wherein the step S200 comprises:
calculating the annual total removal amount of pollutants of the urban sewage treatment plant in the whole country according to the following formula,
Z＝Y×w
wherein Z is the total annual pollutant removal amount of the national urban sewage treatment plants, Y is the total pollutant removal amount of the national sewage centralized treatment facilities, and w is the ratio of the national domestic sewage treatment amount to the total sewage treatment amount.
4. The method of claim 1, wherein the step S300 comprises:
calculating the total pollutant removal amount of each town sewage treatment plant according to the following formula,
C T ＝Z×U
wherein, C T Z is the total annual pollutant removal amount of the urban sewage treatment plants in all the provinces, and U is the percentage of the total pollutant removal amount of the urban sewage treatment plants in all the provinces in the national urban sewage treatment plants.
5. The method of claim 1, wherein the step S400 comprises:
according to the following formula, the annual pollutant removal amount of each sewage treatment plant in the provincial region is calculated,
L＝F×(C in -C out )*365*10 -6
wherein L is an annual pollutant removal amount of each sewage treatment plant in the provincial region, F is a designed treatment water amount which each sewage treatment plant can accommodate per day, and C is in 、C out Respectively monitoring the pollutants of the inlet water and the outlet water of each sewage treatment plant corresponding to provincial areas.
6. The method of claim 1, wherein the step S500 comprises:
calculating the pollutant removal amount of the single sewage treatment plant according to the following formula,
wherein A is the pollutant removal amount of a single sewage treatment plant, F is the designed treatment water amount that can be accommodated by a single sewage treatment plant per day, and C T The total removal amount of pollutants in the urban sewage treatment plants of each province, and M is the total designed treatment water amount of the province where a single sewage treatment plant is located.
7. The method of claim 1, wherein the step S600 comprises:
and classifying the sewage treatment processes into more than one type according to specific treatment process information in the sewage plant basic information database.
8. The method of claim 7, wherein the step S600 comprises:
calculating the direct greenhouse gas emission amount of the sewage treatment plant according to the following formula by using an emission factor method,
E i ＝A i ×EF i
wherein i is a greenhouse gas; e is greenhouse gas emission; a is activity level; EF is the emission factor.
9. The method of claim 1, wherein the step S300 comprises:
the pollutants of urban sewage treatment plants in various provinces comprise COD and TN.
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