CN108182344A - A kind of sewage treatment plant's carbon emission Quantitative Calculation Method - Google Patents

A kind of sewage treatment plant's carbon emission Quantitative Calculation Method Download PDF

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CN108182344A
CN108182344A CN201810054818.XA CN201810054818A CN108182344A CN 108182344 A CN108182344 A CN 108182344A CN 201810054818 A CN201810054818 A CN 201810054818A CN 108182344 A CN108182344 A CN 108182344A
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sewage treatment
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quality
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徐志嫱
张程
姚宸朕
李瑶
高扬
董雯
周爱朝
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Xian University of Technology
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Abstract

A kind of sewage treatment plant's carbon emission Quantitative Calculation Method disclosed by the invention, a kind of sewage treatment plant's carbon emission Quantitative Calculation Method determine the run time of sewage treatment plant, calculate interior sewage treatment plant's carbon direct emission amount E at runtime respectivelyZ, the indirect discharge capacity E of sewage treatment plant's carbonJ, other discharge capacitys of sewage treatment plant's carbon EQWith sewage treatment plant carbon recycling class discharge capacity ER, then obtain sewage treatment plant carbon emission quantization result of calculation EC.The carbon emission Quantitative Calculation Method of the present invention passes through the condition of delimiing a boundary line and calculating cycle, there is specific aim to single sewage treatment plant compared to original accounting method, and strong data supporting can be provided for sewage treatment plant's carbon emission reduction, it is more accurate to obtain carbon emission amount data, single sewage treatment plant is more suitable for, there is good practical value.

Description

A kind of sewage treatment plant's carbon emission Quantitative Calculation Method
Technical field
The invention belongs to sewage water treatment method technical fields, and in particular to a kind of sewage treatment plant's carbon emission quantum chemical method side Method.
Background technology
With being continuously increased for global carbon emission amount, seeking the development pattern of low-carbon environment-friendly has become even country of enterprise Developing goal.According to " Global Carbon plan " (Globe Carbon Project) report：Global carbon emission amount is from nineteen fifty-nine 24.5 hundred million tons of rise to 2015 9,900,000,000 tons, average annual growth rate are 1.31 hundred million tons.The inter-governmental climate change of the United Nations is special The committee (IPCC) points out that being continuously increased for carbon emission amount has caused climate warming in the climate change report of publication in 2014 Through being proved, global average temperature about increases 0.85 DEG C between nearly 100 years, and if Global Temperature can be to life after increasing 2 DEG C State system generates irreversible influence, directly threatens the existence of the mankind.For this phenomenon, countries in the world have been formulated a series of low Carbon develops and the common recognition and agreement of carbon emission reduction, such as《The Kyoto Protocol》、《The United Nations's climate change framework pact》、《Copenhagen Agreement》Deng, that is to say, that following carbon emission power means that right to development of the country in world structure, thus low carbon development pair China's economic development has extremely important meaning.
Sewage treatment industry is as one of the essential part of human lives and main carbon emission source.According to The statistics of developed country, sewage treatment industry carbon emission amount account for the 1-2% of whole society's total release, occupy preceding ten big carbon emission rows Industry.China's environmental statistic data in 2014 shows that the greenhouse gases that offal treatment industry is discharged account for the 3.4% of the whole industry. Under such overall background, a set of low-carbon operation reserve is also being sought by sewage treatment plant.But the country is currently for sewage treatment plant The research of carbon emission is less, quantifies counting system without the sewage treatment industry carbon emission of complete set.
The quantum chemical method of sewage treatment plant's carbon emission is estimating of providing of the waste chapters and sections provided using (IPCC) mostly Calculation method.IPCC guides carbon emission quantifies accounting method：
(1) computational methods of methane
Methane emission estimation general formula be：
Wherein：
CH4The CH in inventory time4Discharge capacity, unit kgCH4/ year；
TOW- inventory time wastewater through organic matter total amounts, unit are kgBOD/；
The S- inventory times, unit was kgBOD/ with the organic principle of sludge removal；
UiThe population ratio of inventory time income groups i；
Ti,jInventory time each income groups ratio i utilizes the degree in processing/discharge approach or system j；
I- income groups：Rural area, city booming income and city low income；
The each processing of j-/discharge approach or system；
EFjEmission factor, unit kgCH4/BOD；
The CH that the R- inventory times recycle4Amount, unit kgCH4/ year.
(2) computational methods of nitrous oxide
The general formula of sewage treatment plant's nitrous oxide emission amount is：
N2OEmission=PTWWTP·F·EFWWTP
Wherein：
N2The N2O discharge capacitys in OEmission- inventory times, unit are kgN2O/；
P- populations, unit are behaved；
TWWTPConcentrate the producing level of Modern sewage treatment plant, unit %；
Protein ratio in F- sewage, default value 1.25；
EFWWTPThe factor is discharged by sewage treatment plant, and unit is 3.2gN2O/ person/year.
Wherein emission factor is calculated according to the situation of developed country, China's sewage composition and processing mode and flourishing state Family is variant, and this method does not have single sewage treatment plant commonly used in calculating the carbon emission amount in area or country The carbon dioxide that microbial metabolism in sewage disposal process generates is classified as biogenesis, does not charge to dirt by specific aim, IPCC In water treatment plant's carbon emission amount.
The carbon emission evaluation method of IPCC guides, can be according to indexs such as inflow and outflow COD, BOD, TN, using fixation The direct carbon emission of direct emission coefficient estimate sewage treatment plant, this method calculate it is easy, can be to entire sewage treatment industry Emission behaviour is estimated and is compared.But since the direct emission coefficient in IPCC guides is some cases according to developed country It is calculated, and value range is larger, so specific aim is not strong.Meanwhile IPCC tissues also suggest various countries according to the reality of oneself Border situation, determines emission factor.
Invention content
The object of the present invention is to provide a kind of sewage treatment plant's carbon emission Quantitative Calculation Methods, solve sewage treatment plant's carbon Emission amount calculation method is inaccurate and the problem of suitable for single sewage treatment plant.
The technical solution adopted in the present invention is that a kind of sewage treatment plant's carbon emission Quantitative Calculation Method is determined at sewage The run time of factory is managed, calculates interior sewage treatment plant's carbon direct emission amount E at runtime respectivelyZ, between sewage treatment plant's carbon Run in high-volume EJ, other discharge capacitys of sewage treatment plant's carbon EQWith sewage treatment plant carbon recycling class discharge capacity ER, then according to formula (1) sewage treatment plant carbon emission quantization result of calculation E is obtainedC；
EC=EZ+EJ+EQ-ER (1)。
It is of the invention to be further characterized in that,
Sewage treatment plant carbon direct emission amount EZSpecific calculating process it is as follows：
Step 1, based on carbonaceous amount equilibrium relation, water is passed in and out according to sewage treatment plant, Inlet and outlet water total content of organic carbon, is remained Organic carbon decrement in remaining sludge yield, organic carbon content and biochemical section sludge, establishes formula (2)：
Wherein, QinFor sewage treatment plant inflow flow, m3, TOCinFor sewage treatment plant inflow organic carbon content, mg/L, Δ CslFor sludge carbon decrement, g, Q in processing procedureoutFor sewage disposal plant effluent flow, m3, TOCoutFor sewage disposal plant effluent Organic carbon content, mg/L, MsloutFor surplus sludge volume, kg, ωocoutFor organic carbon content, g/kg in excess sludge,For dirt CO is converted into mud disposal process2Carbonaceous amount, g,To be converted into CH during sludge treatment4Carbonaceous amount, g；
By formula (2) it is found that CO in gaseous form2And CH4The carbon of spilling is formula (3),
Step 2, according to the reactional equation of biochemistry section, i.e. anoxic phases, anaerobic stages and aerobic stage during sewage disposal, lead to It crosses in calculating step 1 in biochemical section CO2And CH4Each self-discharging ratio；
Step 3, according to the nitration reaction and anti-nitration reaction of biological denitrification process during sewage disposal, biological denitrificaion mistake is calculated Journey product N2The discharge capacity of O
Step 4, according to CO in step 22And CH4Each self-discharging ratio, determine CO2And CH4Actual emissionIn addition N in step 32The discharge capacity of OObtain sewage treatment plant carbon direct emission amount EZ。
Anti-nitration reaction occurs for step 2 anoxic phases, and reaction equation is specific as follows：
Organic carbon quality and CO can be obtained according to formula (4)2The relationship of quality：
Anaerobic digestion reaction and endogenous metabolism reaction occur for anaerobic stages in step 2, and corresponding reaction equation is as follows：
Anaerobic digestion is reacted：
Endogenous metabolism reacts：
0.05C5H7O2N+0.2H2O→0.075CO2+0.125CH4+0.05NH4 ++0.05HCO3 - (7)
By formula (6)-(7) it is found that anaerobic stages CO2And CH4Yield can by the organic carbon reduction in this stage and Microbial degradation Mass Calculation obtains, formula (8)-(10) are obtained by the relationship between quality of formula (6)-(7)：
MDetest degradation=Q × HRTAnaerobism×MLVSS×KDetest 0×10-3 (9)
The CH generated is decomposed by organic matter4For：
In above formula (8)-(10), parameter 0.91 is generation CO in formula (6)2Relationship between quality system between being consumed with carbon source Number, parameter 0.58 are generation CO2With the relationship between quality coefficient of endogenous metabolism, parameter 0.77 is generation CH4Between being consumed with carbon source Relationship between quality coefficient, 0.35 is generation CH4With the relationship between quality coefficient of endogenous metabolism, Q is sewage load, m3/ d, TOCDetest inFor Anaerobic stages water inlet organic carbon content, mg/L, TOCDetest outOrganic carbon content, mg/L, M are discharged for anaerobic stagesDetest degradationFor anaerobism rank The cell quality of section endogenous respiration degradation, kg/d, HRTAnaerobismFor aerobic stage hydraulic detention time, MLVSS is aerobic tank mixed liquor Volatile suspended solids concentration, KDetest 0For attenuation coefficient, d-1。
Aerobic stage in step 2 includes two generation CO2Biochemical process：
First, organic matter carries out the aerobic CO for decomposing and generating2Discharge, reaction process are as follows：
2C10H19O3N+25O2——→20CO2+16H2O+2NH3 (11)
According to the relationship between formula (11) organic carbon quality and oxygen consumption：
In formula (12)It is levied according to total organic carbon removing scale in aerobic stage sewage, the oxygen of this discrete consuming Amount is for synthesizing the sum of the amount of oxygen of neoblast consumption and the amount of oxygen for aerobic decomposition and consumption, and synthesis neoblast consumes Amount of oxygen is calculated using the microbial biomass and the oxygen equivalent of bacterial cell generated and is obtained, and calculation formula is as follows：
XN, it is aerobic=Y × BODIt cuts down=yYtQ[(TOCGood in-TOCGood out)×2.67]×10-3 (14)
In formula (13) and (14), parameter 1.47 is the oxygen equivalent of carbon, and parameter 1.42 is the oxygen equivalent of carbon, and parameter 2.67 is The amount of oxygen needed for unit organic carbon is consumed, Q is sewage load, m3/ d, TOCGood inFor aerobic stage intake organic carbon content, Mg/L, TOCGood outOrganic carbon content, mg/L, X are discharged for aerobic stageN, it is aerobicFor newly synthesized microbial biomass, kg/d, y is MLVSS/MLSS, sanitary sewage take 0.7, YtFor sludge yield coefficient, kgMLSS/kgBOD5, usually take 0.4~0.8；
Second is that when the content of organics microorganism that is lower starts the CO2 discharges of endogenous respiration generation, reaction equation is：
C5H7O2N+5O2→5CO2+2H2O+NH3+ energy (15)
According to chemical equation and reaction principle, this stage CO2Yield is related with the cell quality that this stage degrades：
MGood degradation=Q × HRTIt is aerobic×MLVSS×K0×10-3 (17)
Wherein MGood degradationCell quality, kg/d, Q for aerobic stage endogenous respiration degradation are sewage load, m3/ d, HRTIt is aerobicAerobic stage hydraulic detention time, d-1, MLVSS be aerobic tank mixed liquor volatile suspended solid, MLVSS concentration, K0For attenuation Coefficient, d-1。
Sewage treatment plant N in step 32O discharge capacitysComputational methods such as following formula：
Pond face area, m wherein for each biochemical sections of A2,For N2Release iron, the g/ (m of O2D), 310 be N2O's CO2 equivalent, the N for discharging 1kg2O is equivalent to the CO of 310kg2。
CO is determined in step 42And CH4Actual emissionThe specific steps are：
Step 4.1, by calculating, gas form CO in formula (3)2Quality is：
By calculating, gas form CH in formula (3)4Quality is：
Step 4.2, by the CO in step 4.12And CH4Quality is converted into carbon quality：
Wherein,For the carbon quality in formula (19),For the carbon quality in formula (20)；
Step 4.3, simultaneous formula (3), (19)-(22) can obtain,
Obtain formula：
The indirect discharge capacity E of sewage treatment plant's carbonJPredominantly CO caused by thermal power generation2Indirect discharge, specifically such as：
EJ=KEF (26)
Wherein, K is electric power consumption, kWh；EF is greenhouse gas emission coefficient and EF=as caused by electric power 0.997kgCO2/kWh。
Other discharge capacitys of sewage treatment plant's carbon EQThe consumption of other medicaments is predominantly added in sewage disposal process, is calculated Formula is as follows：
EQ=K'EF'(27)
Wherein, K' is reagent consumption amount, kWh；EF' is greenhouse gas emission coefficient, kgCO2/ as caused by reagent consumption Kg medicaments；
Other medicaments are that carbon source, lime, flocculant and disinfectant NaClO, the respective EF' values of addition are specially：For 1.54kgCO2/CH3OH；EF'LimeFor 1.74CO2/kgCaO；EF'FlocculantFor 20~30CO2/ kg flocculants； EF'Disinfectant NaClOFor 1.4kgCO2/ kg disinfectants.
Sewage treatment plant carbon recycling class discharge capacity ERPredominantly methane recovery, it is known that CH4Calorific value be 5.56 × 104KJ/ Kg recycles every kilogram of CH4It can generated energy 15.46kWh, the CO that consumption 1kWh electric power will cause 0.997kg2Discharge, then：
WhereinMethane mass, kg for recycling.
The beneficial effects of the invention are as follows：A kind of sewage treatment plant's carbon emission Quantitative Calculation Method of the present invention is by using sewage Treatment plant's carbon emission is divided into direct emission, indirectly discharge and other discharge three classes, condition of delimiing a boundary line and calculating cycle, according to dirt Processing water, Inlet and outlet water organic carbon content and the operation data on basis of water treatment plant etc. calculate sewage treatment plant in the period Carbon emission amount；To single sewage treatment plant there is specific aim compared to original accounting method, and can be that sewage treatment plant's carbon subtracts Row provides strong data supporting, and it is more accurate to obtain carbon emission amount data, is more suitable for single sewage treatment plant, there is good reality With value.
Description of the drawings
Fig. 1 is Carbon balance schematic diagram in a kind of sewage treatment plant's carbon emission Quantitative Calculation Method of the present invention；
Fig. 2 is sewage treatment plant's processing technological flow figure in the embodiment of the present invention 2.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
A kind of sewage treatment plant's carbon emission Quantitative Calculation Method of the present invention determines the run time of sewage treatment plant, respectively Calculate interior sewage treatment plant's carbon direct emission amount E at runtimeZ, the indirect discharge capacity E of sewage treatment plant's carbonJ, sewage treatment plant Other discharge capacitys of carbon EQWith sewage treatment plant carbon recycling class discharge capacity ER, then obtain sewage treatment plant's carbon emission quantum chemical method knot Fruit EC。
(1) sewage treatment plant's carbon direct emission amount EZSpecific calculating process it is as follows：
Step 1, as shown in Figure 1, based on carbonaceous amount equilibrium relation, water is passed in and out according to sewage treatment plant, Inlet and outlet water always has Organic carbon decrement in machine carbon content, excess sludge yield, organic carbon content and biochemical section sludge, establishes formula (2)：
Wherein, QinFor sewage treatment plant inflow flow, m3, TOCinFor sewage treatment plant inflow organic carbon content, mg/L, Δ CslFor sludge carbon decrement, g, Q in processing procedureoutFor sewage disposal plant effluent flow, m3, TOCoutFor sewage disposal plant effluent Organic carbon content, mg/L, MsloutFor surplus sludge volume, kg, ωocoutFor organic carbon content, g/kg in excess sludge,For dirt CO is converted into mud disposal process2Carbonaceous amount, g,To be converted into CH during sludge treatment4Carbonaceous amount, g；
By formula (2) it is found that CO in gaseous form2And CH4The carbon of spilling is formula (3),
Step 2, according to the reactional equation of biochemistry section, i.e. anoxic phases, anaerobic stages and aerobic stage during sewage disposal, lead to It crosses in calculating step 1 in biochemical section CO2And CH4Each self-discharging ratio；
Step 2.1, anoxic phases：Sewage flows first after thick, fine fack, aerated grit chamber into biological processing unit Enter anoxic pond, wherein denitrifying bacterium obtains enough carbon sources, synthesizes neoblast using the organic carbon in water, it is anti-that denitrification occurs Should, the denitrifying bacterium in mixed liquor carries out reduction reaction using organic matter as electron donor, and reaction equation is specific as follows：
Organic carbon quality and CO can be obtained according to formula (4)2The relationship of quality：
Step 2.2, the biogas discharge of anaerobic stages is a very complicated process, the biogas that this process generates Body by 60%-65% CH4With the CO of 35%-40%2Secondly composition also has the H of microcomponent2S、N2、O2、NH3, CO and other Organic compound.These biogas composition depends on the organism kinds that digest and concentration in biological tank, and biological tank Physicochemical condition (pH, temperature) can also influence reaction process, and secondly sulfate and nitrate is also one of influence factor.This rank Duan Fanying is divided into anaerobic digestion reaction and endogenous metabolism reaction, and corresponding reaction equation is as follows：
Anaerobic digestion is reacted：
Endogenous metabolism reacts：
0.05C5H7O2N+0.2H2O→0.075CO2+0.125CH4+0.05NH4 ++0.05HCO3 - (7)
By formula (6)-(7) it is found that anaerobic stages CO2And CH4Yield can by the organic carbon reduction in this stage and Microbial degradation Mass Calculation obtains, formula (8)-(10) are obtained by the relationship between quality of formula (6)-(7)：
MDetest degradation=Q × HRTAnaerobism×MLVSS×KDetest 0×10-3 (9)
The CH generated is decomposed by organic matter4For：
In above formula (8)-(10), parameter 0.91 is generation CO in formula (6)2Relationship between quality system between being consumed with carbon source Number, parameter 0.58 are generation CO2With the relationship between quality coefficient of endogenous metabolism, parameter 0.77 is generation CH4Between being consumed with carbon source Relationship between quality coefficient, 0.35 is generation CH4With the relationship between quality coefficient of endogenous metabolism, Q is sewage load, m3/ d, TOCDetest inFor Anaerobic stages water inlet organic carbon content, mg/L, TOCDetest outOrganic carbon content, mg/L, M are discharged for anaerobic stagesDetest degradationFor anaerobism rank The cell quality of section endogenous respiration degradation, kg/d, HRTAnaerobismFor aerobic stage hydraulic detention time, MLVSS is aerobic tank mixed liquor Volatile suspended solids concentration, KDetest 0For attenuation coefficient, d-1。
Step 2.3, aerobic stage includes two generation CO2Biochemical process：
First, organic matter carries out the aerobic CO for decomposing and generating2Discharge, reaction process are as follows：
2C10H19O3N+25O2→20CO2+16H2O+2NH3 (11)
According to the relationship between formula (11) organic carbon quality and oxygen consumption：
In formula (12)It is levied according to total organic carbon removing scale in aerobic stage sewage, the amount of oxygen of this discrete consuming It is for synthesizing the sum of the amount of oxygen of neoblast consumption and the amount of oxygen for aerobic decomposition and consumption, the oxygen of synthesis neoblast consumption Tolerance is calculated using the microbial biomass and the oxygen equivalent of bacterial cell generated and is obtained, and calculation formula is as follows：
XN, it is aerobic=Y × BODIt cuts down=yYtQ[(TOCGood in-TOCGood out)×2.67]×10-3 (14)
In formula (13) and (14), parameter 1.47 is the oxygen equivalent of carbon, and parameter 1.42 is the oxygen equivalent of carbon, and parameter 2.67 is The amount of oxygen needed for unit organic carbon is consumed, Q is sewage load, m3/ d, TOCGood inFor aerobic stage intake organic carbon content, Mg/L, TOCGood outOrganic carbon content, mg/L, X are discharged for aerobic stageN, it is aerobicFor newly synthesized microbial biomass, kg/d, y is MLVSS/MLSS, sanitary sewage take 0.7, YtFor sludge yield coefficient, kgMLSS/kgBOD5, usually take 0.4~0.8；
Second is that when the content of organics microorganism that is lower starts the CO2 discharges of endogenous respiration generation, reaction equation is：
C5H7O2N+5O2→5CO2+2H2O+NH3+ energy (15)
According to chemical equation and reaction principle, this stage CO2Yield is related with the cell quality that this stage degrades：
MGood degradation=Q × HRTIt is aerobic×MLVSS×K0×10-3 (17)
Wherein MGood degradationCell quality, kg/d, Q for aerobic stage endogenous respiration degradation are sewage load, m3/ d, HRTIt is aerobicAerobic stage hydraulic detention time, d-1, MLVSS be aerobic tank mixed liquor volatile suspended solid, MLVSS concentration, K0For attenuation Coefficient, d-1。
Step 3, according to the nitration reaction and anti-nitration reaction of biological denitrification process during sewage disposal, biological denitrificaion mistake is calculated Journey product N2The discharge capacity of O
Sewage treatment plant N2O discharge capacitysComputational methods such as following formula：
Pond face area, m wherein for each biochemical sections of A2,For N2Release iron, the g/ (m of O2D), 310 be N2O's CO2 equivalent, the N for discharging 1kg2O is equivalent to the CO of 310kg2。
Step 4, according to CO in step 22And CH4Each self-discharging ratio, determine CO2And CH4Actual emissionIn addition N in step 32The discharge capacity of OObtain sewage treatment plant carbon direct emission amount EZ：
Determine CO2And CH4Actual emissionThe specific steps are：
Step 4.1, by calculating, gas form CO in formula (3)2Quality is：
By calculating, gas form CH in formula (3)4Quality is：
Step 4.2, by the CO in step 4.12And CH4Quality is converted into carbon quality：
Wherein,For the carbon quality in formula (19),For the carbon quality in formula (20)；
Step 4.3, simultaneous formula (3), (19)-(22) can obtain,
Obtain formula：
(2) the indirect discharge capacity E of sewage treatment plant's carbonJPredominantly CO caused by thermal power generation2Indirect discharge, specifically such as：
EJ=KEF (26)
Wherein, K is electric power consumption, kWh；EF is greenhouse gas emission coefficient and EF=as caused by electric power 0.997kgCO2/kWh。
(3) other discharge capacitys of sewage treatment plant's carbon EQThe consumption of other medicaments is predominantly added in sewage disposal process, Calculation formula is as follows：
EQ=K'EF'(27)
Wherein, K' is reagent consumption amount, kWh；EF' is greenhouse gas emission coefficient, kgCO2/ as caused by reagent consumption Kg medicaments；
Other medicaments are that carbon source, lime, flocculant and disinfectant NaClO, the respective EF' values of addition are specially：For 1.54kgCO2/CH3OH；EF'LimeFor 1.74CO2/kgCaO；EF'FlocculantFor 20~30CO2/ kg flocculants； EF'Disinfectant NaClOFor 1.4kgCO2/ kg disinfectants.
(4) sewage treatment plant's carbon recycling class discharge capacity ERPredominantly methane recovery, it is known that CH4Calorific value for 5.56 × 104KJ/kg recycles every kilogram of CH4It can generated energy 15.46kWh, the CO that consumption 1kWh electric power will cause 0.997kg2Discharge, Then：
WhereinMethane mass, kg for recycling.
Sewage treatment plant carbon emission quantization result of calculation E is obtained finally by formula (1)C；
EC=EZ+EJ+EQ-ER (1)。
Embodiment 1
Xi'an sewage treatment plant is chosen, which uses inversion A 2/O techniques, and effluent quality performs country Primary standard A standards.The water of day processing at present is about 460,000 m3/ d, daily sludge yield are about 60.58t (dry weight), sludge All outward transport fills after dehydration.The data such as following tables such as factory's whole year Inlet and outlet water data, water quality data, power consumption and the reagent consumption Shown in 1：
1 Xi'an sewage treatment plant processing parameter of table
By parameters such as the water quality of the sewage treatment plant and operations, the sewage plant carbon in the whole year is calculated according to the method for the present invention Discharge capacity, such as the following table 2：
2 Xi'an sewage treatment plant carbon emission discharge quantization result of calculation of table
From the foregoing, it will be observed that Xi'an sewage treatment plant whole year carbon emission in 2016 is 92410.0tCO2, wherein direct emission 44643.2tCO2, 44501.6tCO is discharged indirectly2, other discharges 3265.3tCO2, three parts accounting is 48:48:4.
If according to the carbon emission accounting method gone out given in IPCC guides, the main distinction in the calculating of direct emission amount, So estimated with the algorithm provided in IPCC guides calculating sewage treatment plant's annual carbon direct emission discharge in 2016： According to measured data, it is about 4298777kg to calculate the sewage treatment plant annual BOD that cuts down in 2016, with having for sludge form removal Machine ingredient is about 1110670kg, is chosen according to the coefficient provided in IPCC guides, calculates the sewage treatment plant in 2016 CH4It discharges as 1836kg, conversion CO2For 38563kg.
As can be seen that calculate the discharge of sewage treatment plant whole year using the direct emission method provided in IPCC guides CH4For 1836kg, and CO can not be calculated2Discharge capacity.And it can be separated according to carbon mass balance relationship in the present invention CH4And CO2Respective discharge capacity, and analyzed from data, 1836kg is much smaller than what is gone out according to carbon mass balance calculation$ 841318.25kg do not have accuracy for the sewage treatment plant.
Embodiment 2
By taking the sewage treatment plant of Xianyang as an example, which is about 30,000 m3/ d, sewage treatment process Using A2O techniques, the end of the year 2015 put into serial production operation.Its processing technological flow is as shown in Figure 2.Choose the sewage treatment plant 2016 Days average data is calculated, and the data of sewage treatment plant's carbon emission quantization software input see the table below 3：
Table 3 calculates sewage treatment plant's supplemental characteristic
It is obtained according to result of calculation of the present invention, sewage treatment plant carbon emission amount one day in 2016 is 17746.38kgCO2, Carbon emission level is 0.658kgCO2/ t water, wherein direct emission amount are 7636.37kgCO2, direct emission coefficient is 0.283kgCO2/t；Indirect discharge capacity is 8426.64kgCO2, indirect emission factor is 0.313kgCO2/t；Other discharge capacitys are 1683.36kgCO2, other emission factors are 0.062kgCO2/t。
By embodiment 1-2 it is found that the present invention to obtain carbon emission amount data more accurate, be more suitable for single sewage treatment plant, There is good practical value.

Claims (10)

1. a kind of sewage treatment plant's carbon emission Quantitative Calculation Method, which is characterized in that determine the run time of sewage treatment plant, point Interior sewage treatment plant's carbon direct emission amount E at runtime is not calculatedZ, the indirect discharge capacity E of sewage treatment plant's carbonJ, sewage disposal Other discharge capacitys of factory's carbon EQWith sewage treatment plant carbon recycling class discharge capacity ER, sewage treatment plant carbon row is then obtained according to formula (1) High-volume change result of calculation EC；
EC=EZ+EJ+EQ-ER (1)。
A kind of 2. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 1, which is characterized in that the sewage Treatment plant carbon direct emission amount EZSpecific calculating process it is as follows：
Step 1, based on carbonaceous amount equilibrium relation, water, Inlet and outlet water total content of organic carbon, remaining dirt are passed in and out according to sewage treatment plant Organic carbon decrement in mud yield, organic carbon content and biochemical section sludge, establishes formula (2)：
Wherein, QinFor sewage treatment plant inflow flow, m3, TOCinFor sewage treatment plant inflow organic carbon content, mg/L, Δ CslFor Sludge carbon decrement, g, Q in processing procedureoutFor sewage disposal plant effluent flow, m3, TOCoutIt is organic for sewage disposal plant effluent Carbon content, mg/L, MsloutFor surplus sludge volume, kg, ωocoutFor organic carbon content, g/kg in excess sludge,At sludge CO is converted into during putting2Carbonaceous amount, g,To be converted into CH during sludge treatment4Carbonaceous amount, g；
By formula (2) it is found that CO in gaseous form2And CH4The carbon of spilling is formula (3),
Step 2, according to the reactional equation of biochemistry section, i.e. anoxic phases, anaerobic stages and aerobic stage during sewage disposal, pass through meter It calculates in step 1 in biochemical section CO2And CH4Each self-discharging ratio；
Step 3, according to the nitration reaction and anti-nitration reaction of biological denitrification process during sewage disposal, biological denitrification process production is calculated Object N2The discharge capacity of O
Step 4, according to CO in step 22And CH4Each self-discharging ratio, determine CO2And CH4Actual emissionIn addition N in step 32The discharge capacity of OObtain sewage treatment plant carbon direct emission amount EZ。
A kind of 3. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 2, which is characterized in that the step Anti-nitration reaction occurs for 2 anoxic phases, and reaction equation is specific as follows：
Organic carbon quality and CO can be obtained according to formula (4)2The relationship of quality：
A kind of 4. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 3, which is characterized in that the step Anaerobic digestion reaction and endogenous metabolism reaction occur for anaerobic stages in 2, and corresponding reaction equation is as follows：
Anaerobic digestion is reacted：
Endogenous metabolism reacts：
0.05C5H7O2N+0.2H2O→0.075CO2+0.125CH4+0.05NH4 ++0.05HCO3 - (7)
By formula (6)-(7) it is found that anaerobic stages CO2And CH4Yield can pass through the organic carbon reduction in this stage and micro- life Object degrading quality is calculated, and formula (8)-(10) are obtained by the relationship between quality of formula (6)-(7)：
MDetest degradation=Q × HRTAnaerobism×MLVSS×KDetest 0×10-3 (9)
The CH generated is decomposed by organic matter4For：
In above formula (8)-(10), parameter 0.91 is generation CO in formula (6)2Relationship between quality coefficient between being consumed with carbon source, parameter 0.58 is generation CO2With the relationship between quality coefficient of endogenous metabolism, parameter 0.77 is generation CH4Gate of the quality monitoring between being consumed with carbon source Coefficient, 0.35 is generation CH4With the relationship between quality coefficient of endogenous metabolism, Q is sewage load, m3/ d, TOCDetest inFor anaerobism rank Duan Jinshui organic carbon contents, mg/L, TOCDetest outOrganic carbon content, mg/L, M are discharged for anaerobic stagesDetest degradationIt is endogenous for anaerobic stages Breathe cell quality, the kg/d, HRT of degradationAnaerobismFor aerobic stage hydraulic detention time, MLVSS is aerobic tank mixed liquor volatility Suspended sediment concentration, KDetest 0For attenuation coefficient, d-1。
A kind of 5. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 4, which is characterized in that the step Aerobic stage in 2 includes two generation CO2Biochemical process：
First, organic matter carries out the aerobic CO for decomposing and generating2Discharge, reaction process are as follows：
2C10H19O3N+25O2——→20CO2+16H2O+2NH3 (11)
According to the relationship between formula (11) organic carbon quality and oxygen consumption：
In formula (12)It is levied according to total organic carbon removing scale in aerobic stage sewage, the amount of oxygen of this discrete consuming is to use In the sum of the amount of oxygen that synthesis neoblast consumes and the amount of oxygen for aerobic decomposition and consumption, the amount of oxygen of synthesis neoblast consumption It is calculated and obtained using the microbial biomass of generation and the oxygen equivalent of bacterial cell, calculation formula is as follows：
XN, it is aerobic=Y × BODIt cuts down=yYtQ[(TOCGood in-TOCGood out)×2.67]×10-3 (14)
In formula (13) and (14), parameter 1.47 is the oxygen equivalent of carbon, and parameter 1.42 is the oxygen equivalent of carbon, and parameter 2.67 is consumption Amount of oxygen needed for unit organic carbon, Q is sewage load, m3/ d, TOCGood inFor aerobic stage intake organic carbon content, mg/L, TOCGood outOrganic carbon content, mg/L, X are discharged for aerobic stageN, it is aerobicFor newly synthesized microbial biomass, kg/d, y MLVSS/ MLSS, sanitary sewage take 0.7, YtFor sludge yield coefficient, kgMLSS/kgBOD5, usually take 0.4~0.8；
Second is that when the content of organics microorganism that is lower starts the CO2 discharges of endogenous respiration generation, reaction equation is：
C5H7O2N+5O2—→5CO2+2H2O+NH3+ energy (15)
According to chemical equation and reaction principle, this stage CO2Yield is related with the cell quality that this stage degrades：
MGood degradation=Q × HRTIt is aerobic×MLVSS×K0×10-3 (17)
Wherein MGood degradationCell quality, kg/d, Q for aerobic stage endogenous respiration degradation are sewage load, m3/ d, HRTIt is aerobicIt is aerobic Stage hydraulic detention time, d-1, MLVSS be aerobic tank mixed liquor volatile suspended solid, MLVSS concentration, K0For attenuation coefficient, d-1。
A kind of 6. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 5, which is characterized in that the step Sewage treatment plant N in 32O discharge capacitysComputational methods such as following formula：
Pond face area, m wherein for each biochemical sections of A2,For N2Release iron, the g/ (m of O2D), 310 be N2The dioxy of O Change carbon equivalent, the N for discharging 1kg2O is equivalent to the CO of 310kg2。
A kind of 7. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 6, which is characterized in that the step CO is determined in 42And CH4Actual emissionThe specific steps are：
Step 4.1, by calculating, gas form CO in formula (3)2Quality is：
By calculating, gas form CH in formula (3)4Quality is：
Step 4.2, by the CO in step 4.12And CH4Quality is converted into carbon quality：
Wherein,For the carbon quality in formula (19),For the carbon quality in formula (20)；
Step 4.3, simultaneous formula (3), (19)-(22) can obtain,
Obtain formula：
A kind of 8. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 1, which is characterized in that the sewage The indirect discharge capacity E for the treatment of plant's carbonJPredominantly CO caused by thermal power generation2Indirect discharge, specifically such as：
EJ=KEF (26)
Wherein, K is electric power consumption, kWh；EF is greenhouse gas emission coefficient and EF=0.997kgCO2/ as caused by electric power kWh。
A kind of 9. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 1, which is characterized in that the sewage Other discharge capacitys for the treatment of plant's carbon EQThe consumption of other medicaments is predominantly added in sewage disposal process, calculation formula is as follows：
EQ=K'EF'(27)
Wherein, K' is reagent consumption amount, kWh；EF' is the greenhouse gas emission coefficient as caused by reagent consumption, kgCO2/kg medicines Agent；
Other described medicaments are that carbon source, lime, flocculant and disinfectant NaClO, the respective EF' values of addition are specially：For 1.54kgCO2/CH3OH；EF'LimeFor 1.74CO2/kgCaO；EF'FlocculantFor 20~30CO2/ kg flocculants； EF'Disinfectant NaClOFor 1.4kgCO2/ kg disinfectants.
A kind of 10. sewage treatment plant's carbon emission Quantitative Calculation Method according to claim 1, which is characterized in that the dirt Water treatment plant carbon recycling class discharge capacity ERPredominantly methane recovery, it is known that CH4Calorific value be 5.56 × 104KJ/kg is recycled Every kilogram of CH4It can generated energy 15.46kWh, the CO that consumption 1kWh electric power will cause 0.997kg2Discharge, then：
WhereinMethane mass, kg for recycling.
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