CN114239230A - Method for constructing carbon emission evaluation index system of sewage treatment plant - Google Patents

Method for constructing carbon emission evaluation index system of sewage treatment plant Download PDF

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CN114239230A
CN114239230A CN202111407904.2A CN202111407904A CN114239230A CN 114239230 A CN114239230 A CN 114239230A CN 202111407904 A CN202111407904 A CN 202111407904A CN 114239230 A CN114239230 A CN 114239230A
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胡香
李涛
吴可
侯红勋
孟令鑫
蒋涛
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Abstract

The invention discloses a method for constructing a carbon emission evaluation index system of a sewage treatment plant, which comprises the following steps: s1, constructing a carbon emission index system framework of the sewage treatment plant, and dividing a hierarchical structure by adopting an analytic hierarchy process, wherein the hierarchical structure comprises layers and element indexes contained in each layer; s2, determining the weight of each layer and each element index according to the relative importance of each layer and each element index on the carbon emission, and grading the value of each element index; s3, collecting operation data of the sewage treatment plant, calculating index values of each element, and determining grading values of the index of each element; s4, constructing a variable-weight carbon emission comprehensive evaluation index meeting the normalization, and completing the construction of a dynamic sewage treatment plant carbon emission comprehensive evaluation index system; and S5, evaluating the carbon emission level of the sewage treatment plant by using the obtained comprehensive evaluation index of the carbon emission. The method is suitable for evaluating the carbon emission level of the sewage treatment plant, and has the advantages of dynamic evaluation, accurate evaluation and the like.

Description

Method for constructing carbon emission evaluation index system of sewage treatment plant
Technical Field
The invention relates to the technical field of biological wastewater treatment, in particular to a method for constructing a carbon emission evaluation index system of a sewage treatment plant.
Background
Reducing carbon emission is an important task for ecological civilization construction and sustainable development. The sewage treatment industry plays a decisive role in controlling water pollution, but is also an important carbon emission source. At present, the trends of 'high-quality effluent based on high energy consumption and high material consumption' and 'water pollutant and greenhouse gas emission reduction' caused by the high-quality effluent are increased year by year. It is roughly estimated that the greenhouse gas emission in 2030 s in the whole sewage treatment industry in China will reach 2.95% of the national greenhouse gas emission. The potential of a sewage treatment plant is exploited to reduce energy consumption and material consumption, improve the resource utilization level of sewage and sludge, and reduce the emission of greenhouse gases such as carbon dioxide and the like while reducing the emission of sewage pollutants by combining the application of ecological treatment processes such as carbon sink and the like, so that the method is a necessary direction for sustainable development of the sewage treatment industry.
The traditional carbon emission evaluation work of the sewage treatment plant is only single evaluation from a certain single level, but due to the internal complexity of the sewage treatment plant, a single evaluation index is not enough to comprehensively and accurately evaluate the carbon emission level of the whole plant area. At present, a scientific and reasonable construction method of a carbon emission evaluation index system of a sewage treatment plant is lacked, and the method is used for dynamically and accurately evaluating the carbon emission level of the sewage treatment plant.
Disclosure of Invention
The invention aims to provide a method for constructing a carbon emission evaluation index system of a sewage treatment plant, which is used for dynamically and accurately evaluating the carbon emission level of the sewage treatment plant.
In order to achieve the above object, the present invention provides a method for constructing a carbon emission evaluation index system of a sewage treatment plant, comprising:
s1, constructing a carbon emission index system framework of the sewage treatment plant, and dividing a hierarchical structure by adopting an analytic hierarchy process, wherein the hierarchical structure comprises layers and element indexes contained in each layer;
s2, determining the weight of each layer and each element index according to the relative importance of each layer and each element index on the carbon emission, and grading the value of each element index;
s3, collecting operation data of the sewage treatment plant, calculating index values of each element, and determining grading values of the index of each element;
s4, constructing a variable-weight carbon emission comprehensive evaluation index meeting the normalization, and completing the construction of a dynamic sewage treatment plant carbon emission comprehensive evaluation index system;
and S5, evaluating the carbon emission level of the sewage treatment plant by using the obtained comprehensive evaluation index of the carbon emission.
Further, the levels include an energy consumption and material consumption level, a resource reuse level, a carbon sink level and a carbon emission level.
Further, the energy consumption and material consumption level comprises unit sewage power consumption, unit oxygen pollutant power consumption, unit total nitrogen carbon source consumption reduction, unit total phosphorus removal agent consumption reduction and unit dry sludge consumption.
Further, the resource recycling level comprises a recycled water utilization rate, a sludge resource energy self-sufficiency rate, a solar photovoltaic power generation energy self-sufficiency rate, a water source heat pump energy self-sufficiency rate and other energy self-sufficiency rates.
Further, the carbon sink level comprises the green space rate of the plant area and the plant carbon fixation amount of the ecological treatment process.
Further, the level of carbon emissions includes carbon emissions per unit of wastewater and carbon emissions per unit of pollutants.
Further, the calculation formula of the carbon emission per unit pollutant is as follows:
Figure BDA0003365200750000021
wherein F42Carbon emission per pollutant, kgCO2eq/kg；F41kgCO is the carbon emission per unit of wastewater2eq/m3Calculating according to the technical guideline for the coordinated control of greenhouse gas accounting for pollutant removal in the urban sewage treatment plant (trial); qdaiIs the daily treatment capacity of a sewage treatment plant, m3/d；CODraiThe chemical oxygen demand of the inlet water is the daily average concentration, mg/L; CODeaiThe chemical oxygen demand daily average concentration of effluent is mg/L; BODraiThe biochemical oxygen demand daily average concentration is mg/L in five days of water inflow; BODeaiThe biochemical oxygen demand daily average concentration of effluent five days is mg/L; NH (NH)4 +-NraiThe daily average concentration of the ammonia nitrogen in the inlet water is mg/L; NH (NH)4 +-NeaiThe daily average concentration of the ammonia nitrogen in the effluent is mg/L; TN (twisted nematic)raiThe total nitrogen daily average concentration of the inlet water is mg/L; TN (twisted nematic)eaiThe total nitrogen daily average concentration of effluent is mg/L; TPraiThe daily average concentration of total phosphorus in the feed water is mg/L; TPeaiThe total phosphorus daily average concentration of the effluent is mg/L.
Further, the calculation formula of the variable weight carbon emission comprehensive evaluation index meeting the normalization is as follows:
Figure BDA0003365200750000022
wherein F is a comprehensive evaluation index of carbon emission, lambdaiIs the weight of the ith layer, gammaiWeight of the j-th element index, Fi,j is the grading value of each element index.
Compared with the prior art, the invention has the following technical effects: aiming at the construction of the carbon emission index system of the sewage treatment plant, the invention starts from four levels of energy consumption and material consumption level, resource reuse level, carbon sink level and carbon emission level, screens and extracts element indexes capable of reflecting the universal adaptability of the relevant level characteristics according to the basic characteristics of each level, constructs the carbon emission comprehensive evaluation index system of the sewage treatment plant, introduces the variable weight concept, and realizes the dynamic evaluation and the accurate evaluation of the carbon emission level of the sewage treatment plant.
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FIG. 1 is a schematic flow chart of a method for constructing a carbon emission evaluation index system of a sewage treatment plant according to the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments, but not all embodiments, of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the invention discloses a method for constructing a carbon emission evaluation index system of a sewage treatment plant, which comprises the following steps of S1 to S5:
s1, constructing a carbon emission index system framework of the sewage treatment plant, and dividing a hierarchical structure by adopting an analytic hierarchy process, wherein the hierarchical structure comprises layers and element indexes contained in each layer;
further, the levels include an energy consumption and material consumption level, a resource reuse level, a carbon sink level and a carbon emission level.
Further, the energy consumption and material consumption level comprises unit sewage power consumption, unit oxygen pollutant power consumption, unit total nitrogen carbon source consumption reduction, unit total phosphorus removal agent consumption reduction and unit dry sludge consumption.
Further, the resource recycling level comprises a recycled water utilization rate, a sludge resource energy self-sufficiency rate, a solar photovoltaic power generation energy self-sufficiency rate, a water source heat pump energy self-sufficiency rate and other energy self-sufficiency rates.
Further, the carbon sink level comprises the green space rate of the plant area and the plant carbon fixation amount of the ecological treatment process.
Further, the level of carbon emissions includes carbon emissions per unit of wastewater and carbon emissions per unit of pollutants.
The framework of the carbon emission evaluation index system of the sewage treatment plant constructed according to the step of S1 is shown in table 1.
TABLE 1 evaluation index system framework for carbon emission of sewage treatment plant
Figure BDA0003365200750000041
S2, determining the weight of each layer and each element index according to the relative importance of each layer and each element index on the carbon emission, and grading the value of each element index;
at present, more than 95% of county-level cities in the country are built into sewage treatment plants and put into operation, treatment processes, structures, equipment and the like are determined, and the newly-built sewage treatment plants consider more resource recycling of sewage and sludge and application of a carbon sink process in the design planning stage, so that on one hand, in the embodiment, in order to facilitate low-carbon operation of the stock sewage treatment plants, the reality and the service are respected; on the other hand, the method is beneficial to resource and low-carbon construction introduction of a newly-built sewage treatment plant, and in order to take account of balance between energy conservation and consumption reduction of mature technology and resource technology, balance between construction level and operation management level, and balance between current-term and medium-term economic development, in the embodiment, an energy consumption and material consumption aspect (F) is adopted1) Is assigned a weight of 0.3, resource reuse level (F)2) Has a weight distribution of 0.2, carbon sink level (F)3) Is assigned a weight of 0.1, carbon emission horizon (F)4) Is assigned a weight of 0.4.
In this embodiment, the weight distribution of each element index in each layer is as follows:
energy and material consumption layer (F)1) According to the calculation of carbon emission of the existing sewage treatment plant, the influence of the power consumption on the carbon emission is obviously larger than the carbon emission of the carbon source, the phosphorus removal medicament and the sludge medicament, so that the unit sewage power consumption (F) is calculated in the embodiment11) Has a weight of 0.4, and a unit oxygen-consuming pollutant power consumption (F)12) Weight distribution of (3) was 0.3, and carbon source consumption was reduced per total nitrogen (F)13) The weight distribution of (A) is 0.1, and the consumption of phosphorus removal agent is reduced per total phosphorus (F)14) Is assigned a weight of0.1, unit dry sludge dosage (F)15) Is assigned a weight of 0.1.
Resource reuse layer (F)2) At present, the main approaches for realizing resource recycling of sewage treatment plants are as follows: the effluent is reused for river supply, industrial cooling and the like by improving the effluent standard, so that the regeneration utilization rate of the sewage tail water is improved; the utilization rate of sludge resource is improved by the technologies of anaerobic digestion, incineration and the like of excess sludge; the system is a new energy utilization system which takes renewable energy sources such as solar photovoltaic power generation, water source heat pumps, wind energy and the like as cores, increases energy supply, optimizes energy structures, improves the self-sufficiency rate of energy sources in factories, and creates a multi-path and sustainable energy supply system. The operating target of carbon neutralization of a sewage treatment plant can be met to the greatest extent by means of excess sludge conversion energy and a sewage source heat pump, and the energy available for solar photovoltaic power generation is slightly low and can only meet about 10% of operating energy consumption. Therefore, the present embodiment will use the regeneration water utilization rate (F)21) The weight distribution of the sludge is 0.2, and the self-sufficiency rate (F) of the sludge resource energy22) The weight distribution of (A) is 0.3, and the self-supporting rate (F) of the solar photovoltaic power generation energy source23) The weight distribution of the heat pump is 0.1, and the energy self-sufficiency rate (F) of the water source heat pump24) The weight distribution of (D) is 0.3, the self-sufficiency of other energy sources (F)25) Is assigned a weight of 0.1.
Carbon sink plane (F)3) Including factory green space ratio (F)31) Ecological treatment process plant carbon fixation amount (F)32) Two key indicators, and both are the process of reducing the concentration of greenhouse gases in the atmosphere by plants absorbing carbon dioxide from the atmosphere. Therefore, in the present embodiment, the green space ratio (F) of the factory floor is set31) The weight distribution of (A) is 0.5, and the ecological treatment process plant carbon fixation amount (F)32) Is assigned a weight of 0.5.
Carbon emission level (F)4) Not only considering the carbon emission (F) of the unit sewage41) Further, the carbon emission per unit pollutant (F) related to the concentration of the water quality pollutant of the inlet water is taken into consideration42). And carbon emission per unit of wastewater (F)41) In contrast, carbon emission per unit pollutant (F)42) Can more clearly and objectively reflect the removal of the unit chemical oxygen demand,Five days of biochemical oxygen demand, ammonia nitrogen, total nitrogen and total phosphorus carbon emission. Therefore, in the present embodiment, the carbon emission (F) per unit wastewater41) Is assigned a weight of 0.4, carbon emission per pollutant (F)42) Is assigned a weight of 0.6.
The numerical values of each element index of each layer are graded as follows by combining the design scale of a sewage treatment plant and the actual operation current situation of the sewage treatment industry:
energy and material consumption layer (F)1)：
TABLE 2 grading of indexes of each element in energy consumption and material consumption level
Figure BDA0003365200750000061
Resource reuse layer (F)2)：
TABLE 3 grading of each element index of resource reuse level
Figure BDA0003365200750000071
Carbon sink plane (F)3)：
TABLE 4 grading of each element index of carbon sink level
Figure BDA0003365200750000072
Carbon emission level (F)4)：
Table 5 grading of each element index at carbon emission level
Figure BDA0003365200750000081
S3, collecting operation data of the sewage treatment plant, calculating index values of each element, and determining grading values of the index of each element;
in particular, energy and material consumption level (F)1) The calculation formula of each index is as follows:
unit ofSewage power consumption (F)11) Calculated as follows:
Figure BDA0003365200750000082
in the formula: f11-power consumption per unit of sewage, kWh/m3；Ema-monthly electricity consumption, kWh; qdaActual daily wastewater treatment, m3D; t-evaluation period effective operation days; tt — number of calendar months of evaluation period.
Unit oxygen pollutant consumption (F)12) Calculated as follows:
Figure BDA0003365200750000083
in the formula: f12-power consumption per oxygen-consuming pollutant, kWh/kg; BODraActual influent BOD5Daily average concentration, mg/L; BODeaActual effluent BOD5Daily average concentration, mg/L;
Figure BDA0003365200750000084
actual feed water NH4 +-N daily average concentration, mg/L;
Figure BDA0003365200750000085
actual water discharge NH4 +N daily average concentration, mg/L.
Carbon source consumption reduction per total nitrogen (F)13) Calculated as follows:
Figure BDA0003365200750000086
in the formula: f13-carbon source consumption reduction per total nitrogen, kg/kg; PAda-daily consumption of external carbon source, kg; TN (twisted nematic)raActual influent TN daily average concentration, mg/L; TN (twisted nematic)eaActual water output TN daily average concentration, mg/L.
The phosphorus removal agent consumption per total phosphorus reduction (F14) is calculated as follows:
Figure BDA0003365200750000091
in the formula: f14-reduction of phosphorus removal agent consumption per unit of total phosphorus, kg/kg; PAda-daily consumption of phosphorus removal agent, kg; TPraActual daily mean concentration of influent TP, mg/L; TPeaActual daily concentration of TP in the effluent, mg/L.
Unit dry sludge dosage (F)15) Calculated as follows:
Figure BDA0003365200750000092
in the formula: f15-unit dry sludge dosage, kg/t; PM (particulate matter)da-daily consumption of flocculant, kg; SC (Single chip computer)da-daily actual yield of dewatered sludge, t; SWda-daily average water content of dewatered sludge,%.
In particular, resource reuse (F)2) The calculation formula of each index of the layer is as follows:
regeneration water utilization rate (F)21) Calculated as follows:
Figure BDA0003365200750000093
in the formula: f21-regeneration water utilization,%; qzaActual daily reclaimed water utilization, m3/d；QpaActual daily sewage discharge, m3/d。
Self-sufficient rate of sludge resource (F)22) Calculated as follows:
Figure BDA0003365200750000094
in the formula: f22-sludge resource energy autonomy,%; eWAnnual energy production in sludge recycling, kWh.
Self-supporting rate (F) of solar photovoltaic power generation energy23) Calculated as follows:
Figure BDA0003365200750000095
in the formula: f23-self-sufficiency of solar photovoltaic power generation energy,%; egSolar photovoltaic annual energy production, kWh.
Water source heat pump energy self-sufficient rate (F)24) It should be calculated as follows:
Figure BDA0003365200750000101
in the formula: f24-water source heat pump energy autonomy,%; ebWater source heat pump annual heating and cooling capacity, kWh.
Other self-sufficient rate of energy (F)25) Calculated as follows:
Figure BDA0003365200750000102
in the formula: f25-other energy autonomy,%; eqOther pathway annual energy production, kWh.
Specifically, carbon sink (F)3) The calculation formula of each index of the layer is as follows:
plant area greening rate (F)31) Calculated as follows:
Figure BDA0003365200750000103
in the formula: f31-plant area greening rate,%; sgArea of green plant, m2；SwArea of green plant, m2。
Ecological treatment process plant carbon sequestration rate (F)32) Calculated as follows:
Figure BDA0003365200750000104
in the formula: f32-ecological treatment process of sewage treatment plant carbon sequestration rate, tCO2eq/a；
AjArea of canopy of the j plant in the ecological treatment process, m2。
EFCO2，jCarbon fixation coefficient of the j plant in the ecological treatment process, Kg/(m)2A), see table 6;
Egtotal annual carbon emission from a wastewater treatment plant, tCO2eq/a。
GWPCO2-CO2The value of the global warming potential value is 1.
TABLE 6 carbon fixation coefficient recommendations for different plants
Name of plant Plant type Carbon fixation coefficient/(kgCO)2/m2·a)
Black algae Submerged plant 0.25
Herba Lophatheri and herba Equiseti Arvinsis Floating plant 0.41
Herba Equiseti Arvinsis Submerged plant 0.03
Stonewort Pusheng Submerged plant 0.31
Goldfish algae Submerged plant 0.03
Iris root Emergent aquatic plant 3.14
Gladiolus rhizome Emergent aquatic plant 6.74
All-grass of Reineckia Emergent aquatic plant 1.95
Reed Emergent aquatic plant 3.70
White mango Emergent aquatic plant 2.74
Festuca arundinacea Emergent aquatic plant 4.68
Poa pratensis Emergent aquatic plant 1.07
All-grass of Hemerocallis citrina Emergent aquatic plant 5.49
Root of Hemerocallis Emergent aquatic plant 2.80
Lotus flower Floating plant 4.50
Canna indica Emergent aquatic plant 4.77
Ophiopogon japonicus Emergent aquatic plant 1.37
In particular, carbon emission levels (F)4) The calculation method or formula of each index is as follows:
carbon emission per unit of wastewater (F)41): the calculation is carried out according to the technical guidance (trial) of the coordinated control of the greenhouse gas accounting for the removal of pollutants in urban sewage treatment plants, which is released in 2018 of the national ministry of ecological environment in 4 months.
Carbon emission per unit pollutant (F)42) The following calculation formula is adopted:
Figure BDA0003365200750000111
in the formula: f42Carbon emission per unit of pollutant, kgCO2eq/kg；
QdaiDaily average of sewage treatment plantsTreatment amount, m3/d；
CODraiDaily average chemical oxygen demand concentration of inlet water, kg/m3；
CODeaiDaily average chemical oxygen demand concentration of effluent, kg/m3；
BODraiDaily average biochemical oxygen demand concentration of inlet water for five days, kg/m3；
BODeaiFive-day biochemical oxygen demand daily average concentration of effluent, kg/m3；
NH4 +-NraiDaily average concentration of ammonia nitrogen in inlet water, kg/m3；
NH4 +-NeaiThe daily average concentration of ammonia nitrogen in the effluent is kg/m3；
TNrai-total nitrogen daily average concentration of influent water, kg/m3；
TNeaiThe total nitrogen daily average concentration of effluent, kg/m3；
TPrai-total phosphorus daily average concentration in influent water, kg/m3；
TNeaiThe daily average concentration of total phosphorus in the effluent is kg/m3。
The following description of the carbon emission amount of unit sewage (F) by taking the method for constructing the carbon emission evaluation index system of a sewage treatment plant disclosed by the invention applied to a certain sewage treatment plant as an example41) And carbon emission per unit pollutant (F)42) The method of (3).
Engineering sewage treatment scale of a certain sewage treatment plant is 20 ten thousand meters3D, total coefficient of variation Kz1.3, adopting a sewage treatment process taking AAO + deep bed filter tank filtration as a main body, adopting a treatment process of carrying out centrifugal dehydration on sludge to 80% of water content and then transporting sludge cakes, adopting an ultraviolet disinfection process for disinfection, and adopting a microbial deodorization process for deodorization. The plant area greening rate is 35%, and no ecological treatment process is adopted. The tail water is treated to stably reach surface IV water and is discharged into nearby river channels to serve as a supplementary water source, and the utilization rate of the regenerated water reaches 100%. The sewage treatment plant adopts distributed photovoltaic power generation, the total installed capacity of a project is 1.80792MW, and a 10kV voltage level is adoptedThe solar energy is connected to a user side power grid to supply power to a plant area, and the solar energy generating capacity accounts for 132.1240 ten thousand kilowatt-hours in 2020. The average concentration of the water entering the sewage treatment plant all year round in 2020 is as follows: COD 198mg/L, BOD5＝89.46mg/L，NH4 +-N27.35 mg/L, TN 34.53mg/L, TP 2.57 mg/L; the average concentration of the effluent from the factory in year is as follows: COD 16.6mg/L, BOD5＝4.00mg/L，NH4 +-N＝0.14mg/L，TN＝4.14mg/L，TP＝0.10mg/L。
The carbon emission (F) of the unit sewage is calculated by the sewage treatment plant according to the technical guideline for the coordinated control of the removal of pollutants in the urban sewage treatment plant and the accounting of greenhouse gases (trial)41) 0.391kg of CO2/m3The specific calculation process of water is shown in table 7, and the sewage treatment process in table 7 is an AAO process.
TABLE 7 accounting for 2020 year pollutant removal and greenhouse gas emission reduction of certain sewage treatment plant
Figure BDA0003365200750000121
Figure BDA0003365200750000131
Figure BDA0003365200750000141
Carbon emission per unit of wastewater (F)41)＝20606.38×1000/52707283＝0.391kg CO2/m3And (3) water.
Carbon emission per unit pollutant (F)42) Calculated as follows:
F42＝0.391×144009/((0.3×(198-16.6)+0.1×(89.46-4.00)+0.3×(27.35-0.14)+0.2×(34.53-4.14)+0.1×(2.57-0.14))×0.001×144009)＝5.05kgCO2eq/kg。
in this embodiment, the index classification values of the elements of a certain sewage treatment plant obtained according to the steps from S1 to S3 are shown in Table 8.
TABLE 8 grading values of various indexes of elements of a sewage treatment plant
Figure BDA0003365200750000142
S4, constructing a variable-weight carbon emission comprehensive evaluation index meeting the normalization, and completing the construction of a dynamic sewage treatment plant carbon emission comprehensive evaluation index system;
the carbon emission comprehensive evaluation index calculation formula is specifically as follows:
Figure BDA0003365200750000151
wherein F is a comprehensive evaluation index of carbon emission, lambdaiIs the weight of the ith layer, gammaiIs the weight of the ith element, Fi,j is the index grading value of each element.
The carbon emission comprehensive evaluation index F of the sewage treatment plant is 0.3 × (0.4 × 0.74+0.3 × 0.70+0.1 × 0.98+0.1 × 0.93+0.1 × 0.80) +0.2 × (0.2 × 1+0.3 × 0+0.1 × 0.92+0.3 × 0+0.1 × 0) +0.1 × (0.5 × 0.9+0.5 × 0) +0.4 × (0.4 × 0.85+0.6 × 0.85) ═ 0.6765 × (
Along with the improvement of the whole operation level of the sewage treatment plant and the gradual deep understanding of the industry on carbon emission, the weight lambda of each layeriWeight gamma of each element indexiAnd the grading of each element index changes along with the grading of each element index, so that a dynamic carbon emission index system of the sewage treatment plant is obtained, and the dynamic evaluation and the accurate evaluation of the carbon emission level of the sewage treatment plant are realized.
And S5, evaluating the carbon emission level of the sewage treatment plant by using the obtained comprehensive evaluation index of the carbon emission.
The carbon emission level of the sewage treatment plant can be further evaluated by utilizing the obtained carbon emission comprehensive evaluation index, and the higher the carbon emission comprehensive evaluation index is, the lower the carbon emission level of the sewage treatment plant is; the lower the carbon emission composite evaluation index, the higher the carbon emission level of the sewage treatment plant as a whole. The carbon emission level of sewage treatment plants is also specifically requiredAnd the actual operation management level, the resource recycling level, whether a carbon sink process is adopted or not and the like are combined for specific analysis. The comprehensive evaluation index F of the carbon emission of the sewage treatment plant is 0.6765, the carbon emission level is general, and the analysis is as follows: firstly, the daily average water quantity of the sewage treatment plant is 144009m3D, not reaching the design scale of 20 ten thousand m3The sewage load rate is only 72 percent, so the unit sewage power consumption (F) of the energy consumption and material consumption level is directly caused11) And power consumption per unit oxygen-consuming pollutant (F)12) Is higher. Secondly, the resource recycling of the sewage treatment plant only relates to recycling of reclaimed water, and is lack of energy resource recycling modes such as sludge, water source heat pumps and the like, and is lack of plant carbon fixation of an ecological treatment process. Comprehensive analysis shows that the carbon emission level of the sewage treatment plant is general at present, and the sewage treatment plant has a larger carbon emission and emission reduction space in the future.
The above description is only an example of the present invention and should not be taken as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.

Claims (8)

1. A method for constructing a carbon emission evaluation index system of a sewage treatment plant is characterized by comprising the following steps: s1, constructing a carbon emission index system framework of the sewage treatment plant, and dividing a hierarchical structure by adopting an analytic hierarchy process, wherein the hierarchical structure comprises layers and element indexes contained in each layer; s2, determining the weight of each layer and each element index according to the relative importance of each layer and each element index on the carbon emission, and grading the value of each element index; s3, collecting operation data of the sewage treatment plant, calculating index values of each element, and determining grading values of the index of each element; s4, constructing a variable-weight carbon emission comprehensive evaluation index meeting the normalization, and completing the construction of a dynamic sewage treatment plant carbon emission comprehensive evaluation index system; and S5, evaluating the carbon emission level of the sewage treatment plant by using the obtained comprehensive evaluation index of the carbon emission.
2. The carbon emission evaluation finger of sewage treatment plant according to claim 1Method for building a standard system, characterized in that said levels comprise a power consumption and material consumption level (F)1) Resource reuse layer (F)2) Carbon sink plane (F)3) And carbon emission level (F)4)。
3. The method of constructing a carbon emission assessment indicator system for a wastewater treatment plant according to claim 2, characterized in that said energy and material consumption level (F)1) Including unit sewage power consumption (F)11) And power consumption per unit oxygen-consuming pollutant (F)12) Reduction of carbon source consumption per total nitrogen (F)13) Reduction of phosphorus removal agent consumption per total phosphorus (F)14) And the unit dry sludge dosage (F)15)。
4. The method of construction of a wastewater treatment plant carbon emission evaluation indicator system according to claim 2, characterized in that the resource reuse level (F)2) Including regeneration water utilization factor (F)21) Self-sufficient rate of sludge resource (F)22) Self-supporting rate of solar photovoltaic power generation energy (F)23) Water source heat pump energy self-sufficient rate (F)24) Other energy self-sufficiency rate (F)25)。
5. The method of constructing a carbon emission assessment indicator system for a wastewater treatment plant according to claim 2, characterized in that said carbon sink level (F) is a carbon sink level (F)3) Including green space ratio (F)31) And ecological treatment process plant carbon sequestration rate (F)32)。
6. Method for constructing a carbon emission evaluation index system for a wastewater treatment plant according to claim 2, characterized in that the level of carbon emissions (F)4) Including carbon emission per unit of wastewater (F)41) And carbon emission per unit pollutant (F)42)。
7. The method for constructing a carbon emission evaluation index system for a sewage treatment plant according to claim 6, wherein the carbon emission per unit pollutant (F)42) Is calculated byThe formula is as follows:
Figure FDA0003365200740000011
wherein F42Carbon emission per pollutant, kgCO2eq/kg；F41kgCO is the carbon emission per unit of wastewater2eq/m3；QdaiIs the daily treatment capacity of a sewage treatment plant, m3/d；CODraiThe chemical oxygen demand of the inlet water is the daily average concentration, mg/L; CODeaiThe chemical oxygen demand daily average concentration of effluent is mg/L; BODraiThe biochemical oxygen demand daily average concentration is mg/L in five days of water inflow; BODeaiThe biochemical oxygen demand daily average concentration of effluent five days is mg/L; NH (NH)4 +-NraiThe daily average concentration of the ammonia nitrogen in the inlet water is mg/L; NH (NH)4 +-NeaiThe daily average concentration of the ammonia nitrogen in the effluent is mg/L; TN (twisted nematic)raiThe total nitrogen daily average concentration of the inlet water is mg/L; TN (twisted nematic)eaiThe total nitrogen daily average concentration of effluent is mg/L; TPraiThe daily average concentration of total phosphorus in the feed water is mg/L; TPeaiThe total phosphorus daily average concentration of the effluent is mg/L.
8. The method for constructing the carbon emission evaluation index system of the sewage treatment plant according to claim 1, wherein the calculation formula of the variable-weight carbon emission comprehensive evaluation index satisfying the normalization is as follows:
Figure FDA0003365200740000021
wherein F is a comprehensive evaluation index of carbon emission, lambdaiIs the weight of the ith layer, gammaiWeight of the j-th element index, FiAnd j is a ranking value of each element index.
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CN115222208A (en) * 2022-06-23 2022-10-21 同济大学 Water-energy-carbon coupling model and application thereof in operation evaluation of sewage treatment mechanism
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CN115222208A (en) * 2022-06-23 2022-10-21 同济大学 Water-energy-carbon coupling model and application thereof in operation evaluation of sewage treatment mechanism
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