CN114862640A - Urban area domestic sewage collection rate calculation method - Google Patents

Urban area domestic sewage collection rate calculation method Download PDF

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CN114862640A
CN114862640A CN202210310748.6A CN202210310748A CN114862640A CN 114862640 A CN114862640 A CN 114862640A CN 202210310748 A CN202210310748 A CN 202210310748A CN 114862640 A CN114862640 A CN 114862640A
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王凯
岳强
李秋红
陶志行
吴金华
娄明月
施梦琦
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Jiangsu Provincial Academy of Environmental Science
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Abstract

The invention discloses a method for calculating the domestic sewage collection rate in an urban area, and belongs to the field of wastewater treatment. The invention comprehensively considers the unfavorable factors that a large amount of external water such as underground water, river water and the like enters the municipal sewage collecting pipe network due to the current situation of various kinds of sewage collected by the urban sewage centralized treatment facility and the objective reasons such as damage, leakage and the like of the urban sewage pipe network, effectively calculates the actual domestic sewage collecting rate of the urban area, accurately reflects the actual domestic sewage collecting condition of the area, and provides scientific basis for the perfection of the municipal drainage system of the area.

Description

Urban area domestic sewage collection rate calculation method
Technical Field
The invention belongs to the field of wastewater treatment, and particularly relates to a method for calculating the domestic sewage collection rate in an urban area.
Background
With the continuous promotion of deeply drilling pollution prevention and control attack and hardness fighting, the problem of inadequate sewage collection and treatment becomes an important factor for restricting the urban water environment quality, how to scientifically and objectively reflect the centralized collection condition of main pollutants in regional water, accurately check the number of collected sewage bottoms and accurately find the weak links of urban pollution treatment, and the rapid completion of sewage collection and treatment capacity is a major emergency. The domestic sewage collection rate is an important index for reflecting the regional domestic sewage collection and treatment conditions, and the higher the domestic sewage collection rate is, the less the domestic sewage amount discharged into the environment is, the less pollution is caused to the water environment, and the improvement of the water environment quality is facilitated.
At present, the method for calculating the domestic sewage collection rate mainly divides the quantity of the sewage collected by a sewage treatment plant by the quantity of the domestic sewage generated in an area, the actual operation condition of a town sewage pipe network is not considered by the algorithm, the phenomenon that a large amount of external water such as underground water, river water and the like enters the municipal sewage collection pipe network due to objective reasons such as damage, leakage and the like of the town sewage pipe network is ignored, the external water has various sources and is complex in environment, the water quantity is difficult to measure, the quantity of the sewage collected by the sewage treatment plant is far larger than the quantity of the domestic sewage actually collected, and the calculated domestic sewage collection rate is high; especially for southern coastal cities with high groundwater levels, the domestic sewage collection rate algorithm is seriously distorted and cannot effectively reflect the actual domestic sewage collection condition of the region.
In view of this, a new algorithm is urgently needed to effectively reflect the collection situation of the regional actual domestic sewage.
Disclosure of Invention
1. Problems to be solved
Aiming at the problem that the existing method for calculating the domestic sewage collection rate is inaccurate, the invention provides a method for calculating the domestic sewage collection rate of urban areas. The method comprehensively considers the unfavorable factors that a large amount of external water such as underground water, river water and the like enters the municipal sewage collection pipe network due to the objective reasons such as damage, leakage and the like of various kinds of sewage collected by the current centralized sewage treatment facility and urban sewage pipe network, solves the problem of inaccurate calculation of the regional domestic sewage collection rate in the existing method, and provides scientific basis for the perfection of regional municipal drainage systems.
2. Technical scheme
In order to solve the problems, the technical scheme adopted by the invention is as follows:
the invention discloses a method for calculating the domestic sewage collection rate of an urban area, which comprises the following steps of:
s1, data collection: the method comprises the steps of carrying out urban planning on urban areas, urban domestic water total amount, sewage discharge amount and water quality of industrial enterprises, sewage discharge amount and water quality of large-scale livestock farms, water amount and water quality collected by initial rainwater, water inflow amount and water quality of centralized sewage treatment facilities, sewage amount and water quality of ships and docks collected by the centralized sewage treatment facilities in urban areas, and data collection of the sewage amount and the water quality conveyed to the centralized sewage treatment facilities outside the urban areas;
s2, calculating the urban domestic sewage production in the urban-township area according to the data collected in the step S1;
s3, calculating the domestic sewage COD collection amount of the centralized sewage treatment facility in the urban area according to the data collected in the step S1;
s4, calculating the collection amount of domestic sewage in the urban area according to the data collected in the step S1;
s5, calculating the domestic sewage collection rate in the urban area according to the data collected in the step S1.
Preferably, the step of calculating the urban domestic sewage production amount in step S2 is as follows:
a1, calculating the total quantity Q of domestic water General assembly ；
Q General assembly ＝Q Public +Q Self-contained +Q Steam generating device (1)
In the formula (1), Q General assembly For accounting for regional total domestic water, Q Public For public water supply, Q Self-contained Water consumption, Q, for self-contained water consumers Steam generating device Water consumption for steam; wherein the steam usage is steam usage collected from an area outside of an accounting area;
a2, calculating the sewage yield Q Production of sewage ；
Q Production of sewage ＝Q General assembly ×α (2)
In the formula (2), Q Production of sewage Calculating the amount of the domestic sewage generated in the region, wherein alpha is the sewage breaking coefficient of the domestic sewage; wherein alpha is more than or equal to 0.8 and less than or equal to 0.9.
Preferably, the COD collection amount M of the domestic sewage of the centralized sewage treatment facility in the step s3 Raw material The calculation comprises the total COD collection amount M of the centralized sewage treatment facility Plant (S.A.) Deducting COD collection amount M of industrial enterprise of centralized sewage treatment facility Rabbet (tongue) Livestock and poultry breeding COD collection amount M of centralized sewage treatment facility Livestock and poultry Initial rainwater COD collection amount M of centralized sewage treatment facility Chu Yu COD collection amount M of sewage of ship and wharf Ship and yard And COD collection amount M outside the accounting region Outer cover The specific calculation formula is as follows:
M raw material ＝M Plant (S.A.) -M Rabbet (tongue) -M Livestock and poultry -M Chu Yu -M Ship and yard -M Outer cover (3)
Preferably, the total COD collection of the centralized wastewater treatment facility is calculated according to the following formula:
M plant (S.A.) ＝Q Plant inlet ×C Plant inlet (4)
In the formula (4), M Plant(s) For the central sewage treatment facility COD in the accounting area to collect the total amount, Q Plant inlet For accounting water inflow of centralized sewage treatment facilities in the region, C Plant inlet Is the COD concentration of the inlet water of the centralized sewage treatment facility.
Preferably, the COD collection of the industrial enterprise of the centralized sewage treatment facility is calculated according to the following formula:
Figure RE-GDA0003730331920000021
in the formula (5), M Rabbet (tongue) For accounting COD amount, Q of industrial enterprises accessing centralized sewage treatment facilities in the region Enterprise i For the ith family, there is an automatic on-line monitoring enterprise's sewage take-over amount into the centralized sewage treatment facility, C Enterprise i The COD concentration, Q of the corresponding connecting pipe of the enterprise is automatically monitored on line Enterprises without j The sewage take-over quantity of the jth enterprise which enters the centralized sewage treatment facility without automatic online monitoring is C Enterprises without j And the COD concentration correspondingly taken over by the enterprise is automatically monitored on line for the jth family.
Preferably, the sewage take-over quantity Q of the industrial enterprise is monitored without automatic online monitoring Tongue-and-groove The water consumption of the industrial enterprises is multiplied by the sewage diversion coefficient of the industrial enterprises, and the sewage diversion coefficient of the industrial sewage is equal to the total sewage discharge amount of all the enterprises in the environmental statistical data divided by the total water consumption amount; the COD concentration of the sewage of the enterprises without automatic online monitoring is equal to the total COD discharge amount of all the enterprises in the environmental statistical data divided by the total sewage discharge amount.
Preferably, the livestock and poultry breeding COD collection amount of the centralized sewage treatment facility is calculated according to the following formula:
Figure RE-GDA0003730331920000031
in formula (6), M Livestock and poultry For accounting COD amount, Q, of livestock and poultry farm accessing centralized sewage treatment facilities in the region Livestock and poultry i Sewage take-over volume for the ith livestock farm to enter the centralized sewage treatment facility, C Livestock and poultry i Corresponding adapter tube COD concentration.
Preferably, the initial rainwater COD collection amount of the centralized sewage treatment facility is calculated according to the following formula:
M Chu Yu ＝Q Chu Yu ×C Chu Yu ×φ (7)
in formula (7), M Chu Yu Is at an early stageCOD, Q, of polluted rainwater entering centralized sewage treatment facility Chu Yu Amount of sewage for initial rainwater to enter centralized sewage treatment facility, C Chu Yu The COD concentration of the initial rainwater is shown, and phi is the comprehensive runoff coefficient; q Chu Yu The rainfall is 20 mm-30 mm thick at the initial stage of one-time rainfall; c Chu Yu The value of (a) is 200-500 mg/L; phi is 0.5-0.9.
Preferably, the COD collection amount of the ship and wharf sewage is calculated according to the following formula:
M ship and yard ＝Q Ship and yard ×C Ship and yard (8)
In formula (8), M Ship and yard For accounting COD collection of wharf and ship sewage in the region, Q Ship and yard Collecting sewage quantities for docks and ships in accounting areas, C Ship and yard Collecting the COD concentration of the sewage for ships and docks.
Preferably, the COD collection amount outside the accounting area is calculated according to the following formula:
Figure RE-GDA0003730331920000032
in formula (9), M Outer cover For conveying COD amount, Q, of centralized sewage treatment facilities outside accounting area Outer i Amount of sewage to be delivered outside the accounting area into a centralized sewage treatment facility C Outer i Is its corresponding COD concentration.
Preferably, the steps of calculating the collection amount of the domestic sewage in the urban area in step S4 and the collection rate of the domestic sewage in the urban area in step S5 are as follows:
b1, calculating the domestic sewage collection amount;
Q collection of life ＝M Raw material /C Life check (10)
In the formula (10), Q Collection of life For accounting regional domestic sewage collection amount, C Life check Checking the concentration of the domestic sewage COD in the checking area; m Raw material Collecting amount of domestic sewage COD for a centralized sewage treatment facility; it is composed ofWhen the planned land of the administrative office facilities accounts for less than or equal to 1.3 percent of the planned land of the central urban area, C Life check The value of (A) is 350 mg/L; when the planned land occupation of the administrative office facilities accounts for more than 1.3 percent of the planned land occupation of the central urban area, C Life check Is 420 mg/L;
b2, calculating the domestic sewage collection rate;
η collection of life ＝Q Collection of life /Q Production of sewage (11)
In the formula (11), eta Collection of life For accounting regional domestic sewage collection rate, Q Production of sewage And calculating the production amount of the domestic sewage in the region.
3. Advantageous effects
Compared with the prior art, the invention has the beneficial effects that:
(1) according to the method for calculating the urban area domestic sewage collection rate, the centralized sewage treatment facility is used as a gripper, adverse factors that a large amount of external water such as underground water and river water enters the municipal sewage collection pipe network due to damage, leakage and other objective reasons of various kinds of sewage collected by the centralized sewage treatment facility and urban sewage pipe networks are comprehensively considered, large errors of sewage plant domestic sewage collection amount caused by the fact that the external water such as rainwater, river water and underground water enters the sewage pipe networks are avoided, the actual urban area domestic sewage collection rate is effectively calculated, and scientific basis is provided for the improvement of the regional municipal drainage system;
(2) the method for calculating the domestic sewage collection rate of the urban area is a new domestic sewage collection rate algorithm, not only accurately and effectively reflects the actual domestic sewage collection condition of the area, but also is simple and easy to implement, and has universal regional applicability.
Drawings
FIG. 1 is a flow chart of a method for calculating the domestic sewage collection rate in urban areas according to the invention.
Detailed Description
The invention is further described with reference to specific examples.
As shown in fig. 1, a method for calculating the domestic sewage collection rate in urban areas, which takes Chemical Oxygen Demand (COD) as a calculation factor, planned areas of county (city, district) cities as accounting areas, and the sewage collection range of a centralized sewage treatment plant as a basic accounting unit, comprises the following steps:
s1, data collection: the method comprises the steps of carrying out urban planning on urban areas, urban domestic water total amount, sewage discharge amount and water quality of industrial enterprises, sewage discharge amount and water quality of large-scale livestock farms, water amount and water quality collected by initial rainwater, water inflow amount and water quality of centralized sewage treatment facilities, sewage amount and water quality of ships and docks collected by the centralized sewage treatment facilities in urban areas, and data collection of the sewage amount and the water quality conveyed to the centralized sewage treatment facilities outside the urban areas;
s2, calculating the urban domestic sewage production in the urban-township area according to the data collected in the step S1;
s3, calculating the COD collection amount of the domestic sewage of the centralized sewage treatment facility in the urban area according to the data collected in the step S1;
s4, calculating the collection amount of the domestic sewage in the urban area according to the data collected in the step S1;
and S5, calculating the domestic sewage collection rate in the urban area according to the data collected in the step S1.
In the step S2, the amount of urban domestic sewage generated is calculated, and the specific calculation steps are as follows:
a1 total domestic water amount Q General assembly ；
Q General assembly ＝Q Public +Q Self-contained +Q Steam generation (1)
In the formula (1), Q General assembly For accounting for regional total domestic water, Q Public For public water supply, Q Self-contained Water consumption, Q, for self-contained water consumers Steam generating device Water consumption for steam; wherein the steam usage is steam usage collected from an area outside of an accounting area;
a2, effluent yield Q Production of sewage ；
Q Production of sewage ＝Q General assembly ×α (2)
In the formula (2), Q Production of sewage Calculating the amount of the domestic sewage generated in the region, wherein alpha is the sewage breaking coefficient of the domestic sewage;
the domestic sewage pollution breaking coefficient alpha comprehensively considers factors such as the level of water supply and drainage facilities in buildings in regions, the popularity of drainage systems and the like, and is taken as alpha which is more than or equal to 0.8 and less than or equal to 0.9 by referring to design Specifications for outdoor drainage (GB 50014-2006);
in step S3, the COD collection amount M of the domestic sewage in the centralized sewage treatment facility Raw material The calculation comprises the total COD collection amount M of the centralized sewage treatment facility Plant (S.A.) COD collection quantity M of industrial enterprise with deduction centralized sewage treatment facility Rabbet (tongue) Livestock and poultry breeding COD collection amount M of centralized sewage treatment facility Livestock and poultry Initial rainwater COD collection amount M of centralized sewage treatment facility Chu Yu COD collection amount M of sewage of ship and wharf Ship and yard And COD collection amount M outside the accounting region Outer cover The method comprehensively considers the unfavorable factors that various sewage collected by the current centralized sewage treatment facility and urban sewage pipe network cause a large amount of external water such as underground water, river water and the like to enter the municipal sewage collecting pipe network due to objective reasons such as damage, leakage and the like, and the specific calculation formula is as follows:
M raw material ＝M Plant (S.A.) -M Rabbet (tongue) -M Livestock and poultry -M Chu Yu -M Ship and yard -M Outer cover (3)
Wherein the total COD collection amount M of the centralized sewage treatment facility Plant (S.A.) Calculated according to the following formula:
M plant (S.A.) ＝Q Plant inlet ×C Factory entrance (4)
In the formula (4), M Plant (S.A.) For the central sewage treatment facility COD in the accounting area to collect the total amount, Q Plant inlet For accounting water inflow of centralized sewage treatment facilities in the region, C Plant inlet Is the COD concentration of the inlet water of the centralized sewage treatment facility.
COD collection amount M of industrial enterprise of centralized sewage treatment facility Rabbet (tongue) Calculated according to the following formula:
Figure RE-GDA0003730331920000061
in the formula (5), M Rabbet (tongue) For accounting COD amount, Q of industrial enterprises accessing centralized sewage treatment facilities in the region Enterprise i For ith family, there is an automatic on-line monitoring enterprise's sewage take-over amount into centralized sewage treatment facility, C Enterprise i The COD concentration, Q of the corresponding connecting pipe of the enterprise is automatically monitored on line Enterprises without j The sewage take-over quantity of the jth enterprise which enters the centralized sewage treatment facility without automatic online monitoring is C Enterprises without j The COD concentration of the corresponding takeover of the enterprise is automatically monitored on line for the jth family;
wherein, the sewage take-over quantity Q of the non-automatic online monitoring industrial enterprise Tongue-and-groove The water consumption of the industrial enterprise is multiplied by the sewage turn-over coefficient of the industrial enterprise, and the sewage turn-over coefficient of the industrial enterprise is equal to the total sewage discharge amount of all the enterprises in the environmental statistical data divided by the total water consumption amount; the COD concentration of the sewage of the non-automatic online monitoring enterprise is equal to the total COD discharge amount of all enterprises in the environmental statistical data divided by the total sewage discharge amount;
COD collection amount M for livestock and poultry breeding in centralized sewage treatment facility Livestock and poultry Calculated according to the following formula:
Figure RE-GDA0003730331920000062
in formula (6), M Livestock and poultry For accounting COD amount, Q, of livestock and poultry farm accessing centralized sewage treatment facilities in the region Livestock and poultry i Sewage take-over volume for the ith livestock farm to enter the centralized sewage treatment facility, C Livestock and poultry i The COD concentration of the corresponding connecting pipe;
initial rainwater COD collection amount M of centralized sewage treatment facility Chu Yu Calculated according to the following formula:
M Chu Yu ＝Q Chu Yu ×C Chu Yu ×φ (7)
in formula (7), M Chu Yu Is a firstCOD, Q, of phase-polluted rainwater entering centralized sewage treatment facility Chu Yu Amount of sewage for initial rainwater to enter centralized sewage treatment facility, C Chu Yu The COD concentration of the initial rainwater is shown, and phi is the comprehensive runoff coefficient; the initial rainfall is referenced to GBT50483-2019, Q Chu Yu The rainfall with the thickness of 20 mm-30 mm at the initial stage of one-time rainfall can be taken; the initial rainwater COD concentration can take a value of 200-500 mg/L based on actual measurement data in an accounting area; the phi can be taken as 0.5-0.9 according to the actual condition of the accounting area;
COD collection amount M of sewage of ship and wharf Ship and yard Calculated according to the following formula:
M ship and yard ＝Q Ship and yard ×C Ship and yard (8)
In formula (8), M Ship and yard For accounting COD collection of wharf and ship sewage in the region, Q Ship and yard Collecting sewage quantities for docks and ships in accounting areas, C Ship and yard Collecting sewage COD concentration for ships and docks;
furthermore, the amount of COD collected outside the accounting region M Outer cover Calculated according to the following formula:
Figure RE-GDA0003730331920000063
in formula (9), M Outer cover For conveying COD amount, Q, of centralized sewage treatment facilities outside accounting area Outer i Amount of sewage to be delivered outside the accounting area into a centralized sewage treatment facility C Outer i Is its corresponding COD concentration.
Next, the steps of calculating the collection amount of the domestic sewage in the urban area in step S4 and the collection rate of the domestic sewage in the urban area in step S5 are as follows:
b1, collecting domestic sewage;
Q collection of life ＝M Raw material /C Life check (10)
In the formula (10), Q Collection of life Collecting domestic sewage for accounting areaQuantity collection, C Life check Checking the concentration of the domestic sewage COD in the checking area; m Raw material Collecting amount of domestic sewage COD for a centralized sewage treatment facility; wherein the domestic sewage check concentration can be 350mg/L or 420mg/L according to the daily COD discharge amount, sewage discharge amount, population gathering condition, COD degradation and the like of urban residents; specifically, when the planned land occupation of the administrative office facilities is less than or equal to 1.3% of the planned land occupation of the central urban area, C Life check The value of (A) is 350 mg/L; when the planned land occupation of the administrative office facilities accounts for more than 1.3 percent of the planned land occupation of the central urban area, C Life check Is 420 mg/L;
b2, calculating the domestic sewage collection rate;
η collection of life ＝Q Collection of life /Q Production of sewage (11)
In the formula (11), eta Collection of life For accounting regional domestic sewage collection rate, Q Production of sewage And calculating the production amount of the domestic sewage in the region.
Example 1
Taking a city or county as an example, and 2021 years as a benchmark year, calculating the urban domestic sewage collection rate in 2021 years in the area, and the method comprises the following steps:
1. accounting the production of urban domestic sewage in the area;
a1: and according to the county city planning map, taking the county city planning range as an accounting area. According to the water consumption data provided by departments such as water administration and water conservancy bureau, etc., in 2021, the sum Q of the water consumption of public water supply, water consumption of self-contained water source and steam in the region is calculated General (1) 4009.0 ten thousand tons per year, comprehensively considering the factors of the level of water supply and drainage facilities in the buildings of the planned regional areas of county and city, the popularity of drainage systems and the like, and the sewage diversion coefficient alpha of the domestic sewage is 0.85, so that the production quantity Q of the 2021-year domestic sewage in the county accounting area Production of sewage 3407.6 ten thousand tons/year.
2. Calculating the domestic sewage COD collection amount of the centralized sewage treatment facility in the region;
b1: the county is provided with 1 centralized sewage treatment facility, which is a town sewage treatment plant. The town sewage treatment plantThe daily sewage quantity is multiplied by the COD concentration of the inlet water to obtain the total COD collection quantity M of the sewage treatment plants in the county town in 2021 year Plant (S.A.) 6274 tons/year;
b2: and (4) accounting the COD (chemical oxygen demand) amount of the industrial enterprise accessing the centralized sewage treatment facility in the region. Multiplying the pipe taking amount of the sewage of the enterprise with automatic online monitoring by the corresponding pipe taking concentration to obtain the COD collection amount of the enterprise with automatic online monitoring of 420 tons/year; referring to the environmental statistical data of the county, dividing the sewage amount of all industrial enterprises by the water consumption to obtain that the sewage diversion coefficient of the industrial enterprises is 0.7, and taking the sewage diversion coefficient of the industrial enterprises without automatic online monitoring as 0.7; dividing the total COD discharge amount of all enterprises in the environmental statistical data by the total sewage discharge amount to obtain the sewage take-over concentration of the industrial enterprises of 85mg/L, and taking the sewage take-over concentration of the industrial enterprises without automatic on-line monitoring of 85 mg/L; multiplying the water consumption of the industrial enterprise without automatic on-line monitoring by the sewage turning coefficient of 0.7 and the sewage discharge concentration of 85mg/L to obtain the COD (chemical oxygen demand) amount of the industrial enterprise without automatic on-line monitoring of 45 tons/year, and then obtaining the COD collection amount M of the industrial enterprise of the centralized sewage treatment facility in 2021 year Rabbet (tongue) 465 tons/year;
b3: 1 large-scale livestock and poultry breeding factory sewage in the region accounting range is connected into a centralized sewage treatment facility, and the COD collection amount M of 2021-year livestock and poultry breeding is calculated by multiplying the sewage amount by the concentration Livestock and poultry Is 28 tons;
b4: rainfall runoff can be formed when the rainfall scale of the area is heavy rain, in 2021, the rainfall scale of the area is heavy rain for 11 times, the rainfall amount with the thickness of 25mm is measured at the initial stage of heavy rain falling for one time, and the area of the centralized sewage treatment facility in the area for collecting the initial rainwater is the area of 1.4 square kilometers in the central urban area; according to literature, the COD concentration of the initial rainwater in the county area is 300mg/L, the comprehensive runoff coefficient phi is 0.8, and the COD collection amount M of the initial rainwater in the county is 2021 Chu Yu 92.4 tons;
b5: in 2021, the ship collected sewage and the wharf collected sewage with the water amount of 6 ten thousand tons and the concentration of 340mg/L are conveyed to the centralized sewage treatment facility for treatment in the county, and then in 2021, the COD collection amount M of the ship and wharf sewage in the county is determined Ship and yard 20.4 tons;
b6: in 2021, the county is out of the range of accountingIf the domestic sewage with water amount of 12 ten thousand tons and concentration of 160mg/L is delivered to the centralized sewage treatment facility for treatment, the COD collection amount M of the domestic sewage outside the accounting area of the county is treated in 2021 year Outer cover 19.2 tons;
b7: COD collection amount M of the county centralized sewage treatment facility Plant (S.A.) Minus COD collection of industrial enterprises M Rabbet (tongue) COD collection amount M for livestock and poultry breeding Livestock and poultry COD collection amount M of initial rainwater Chu Yu COD collection amount M of sewage of ship and wharf Ship and yard Obtaining the COD collection amount M of the domestic sewage in the area Raw material It was 5649 tons.
3. Domestic sewage collection rate in accounting area
C1: the planned land occupation of the administrative office facilities in the county is less than 1.3 percent of the planned land occupation of the central urban area, and the checking concentration of the domestic sewage is 350mg/L, so that the quantity Q of the domestic sewage collected in the region is checked Collection of life 1614 ten thousand tons;
c2: in 2021, the collection rate eta of domestic sewage in cities and towns in the county is obtained by dividing 1614 million tons of domestic sewage collected in the county by 3407.6 million tons of domestic sewage Collection of life The content was 47.36%.
Example 2
Taking a region of a certain city as an example, calculating the domestic sewage collection rate of the urban region in 2020 of the region by taking 2020 as a reference year, and the steps are as follows:
1. accounting the production of urban domestic sewage in the area;
a1: and according to the city planning map of the region, taking the city planning range of the region as an accounting region. According to water use data provided by departments such as a water administration and a water conservancy bureau, the daily public water supply amount of the district in 2020 is 3800 ten thousand tons, the water use amount of a self-contained water source is avoided, the steam use amount of the district is produced and provided by an energy company in an accounting area and does not belong to steam outside the accounting area, so the steam use amount is not included in the total amount of the daily water use of the district; the total domestic water amount of the district is 3800 ten thousand tons, the factors of the water supply and drainage facility level and the popularity of the drainage system in the planned regional building of the city of the district are comprehensively considered, the domestic sewage baffling coefficient alpha takes 0.85, and the domestic sewage yield Q of the district in 2020 years Production of sewage 3230 ten thousand tonsAnd (4) a year.
2. Calculating the COD collection amount of domestic sewage of a centralized sewage treatment facility in an accounting area;
b1: the district is provided with 2 centralized sewage treatment facilities, the daily water inflow and the water inflow concentration data of the 2 sewage treatment plants in 2020 year are checked, abnormal data (the sewage inflow is obviously higher than the data of the design scale of the sewage treatment plants) are removed, the daily sewage inflow of the sewage treatment plants is multiplied by the water inflow COD concentration, and the total COD collection amount M of the town sewage treatment plants in the 2020 year is calculated Plant (S.A.) 8100 tons;
b2: and (4) accounting the COD (chemical oxygen demand) amount of the industrial enterprise accessing the centralized sewage treatment facility in the region. Multiplying the sewage take-over quantity of the enterprise with automatic online monitoring by the corresponding take-over concentration to obtain that the COD collection quantity of the enterprise with automatic online monitoring in the region is 500 tons/year; referring to the environmental statistical data of the region, dividing the sewage quantity of all industrial enterprises by the water consumption of the industrial enterprises to obtain the sewage baffling coefficient of the industrial enterprises without automatic on-line monitoring to be 0.68; and dividing the total COD discharge amount of all industrial enterprises in the environmental statistical data by the total sewage discharge amount to obtain the sewage take-over concentration of the industrial enterprises of 95mg/L, wherein the sewage take-over concentration of the industrial enterprises without automatic online monitoring is 95 mg/L. Multiplying the water consumption of the industrial enterprise without automatic online monitoring by the sewage turn-over coefficient of 0.68 and the sewage take-over concentration of 95mg/L to obtain the COD (chemical oxygen demand) take-over quantity of the industrial enterprise without automatic online monitoring of 70 tons/year, and then obtaining the COD collection quantity M of the centralized sewage treatment facility industrial enterprise in the region in 2020 Rabbet (tongue) 570 tons/year;
b3: if no livestock and poultry breeding sewage in the region accounting area is connected into the centralized sewage treatment facility, the livestock and poultry breeding COD collection amount M is obtained in 2020 Livestock and poultry Is 0 ton;
b4: rainfall runoff can be formed when the rainfall scale of the area is medium rain, the rainfall scale of the area is medium rain or above for 40 times in 2021, the average initial rainwater amount is 25mm thick, and the range of the centralized sewage treatment facility in the area for collecting the initial rainwater is 2.0 square kilometers of the central urban area; according to literature, the COD concentration of the initial rainwater in the region is 320mg/L, the comprehensive runoff coefficient phi is 0.85, and then the COD collection amount M of the rainwater in the early period of 2020 years in the region Chu Yu 544 tons;
b5: in 2020, if no ship or wharf collected sewage is conveyed to the centralized sewage treatment facility in the region, the COD collection quantity M of the sewage of the ship or wharf in the region is determined in 2020 Ship and yard Is 0 ton;
b6: if 20 million tons of domestic sewage with the sewage amount of 180mg/L is transported to a centralized sewage treatment facility of the area for treatment outside the area in 2020, the COD collection amount M of the domestic sewage outside the area is calculated in 2020 Outer cover Is 36 tons;
b7: COD collection amount M of centralized sewage treatment facility in the area Plant (S.A.) Minus COD collection of industrial enterprises M Enterprise COD collection amount M for livestock and poultry breeding Livestock and poultry And the initial rainwater COD collection amount M Chu Yu COD collection amount M of sewage of ship and wharf Ship and yard Obtaining the COD collection amount M of the domestic sewage in the area Raw material 6950 tons.
3. Domestic sewage collection rate in accounting area
C1: the planned land occupation of administrative office facilities in the region accounts for more than 1.3 percent of the planned land occupation of the central urban region, the checking concentration of the domestic sewage is 420mg/L, and the quantity Q of the domestic sewage collected in the region is checked Collection of life 1654.8 ten thousand tons;
c2: in 2020, 1652.8 ten thousand tons of domestic sewage collected by the region is divided by 3230 ten thousand tons of domestic sewage to obtain the domestic sewage collection rate eta of the town of the region Collection of life The content was found to be 51.2%.
The present invention and its embodiments have been described above schematically, the description is not restrictive, the data used are only one of the embodiments of the present invention, and the actual data combination is not limited to this. Therefore, if the person skilled in the art receives the teaching, the embodiments and examples similar to the above technical solutions shall not be designed in an inventive manner without departing from the spirit of the present invention, and shall fall within the protection scope of the present invention.

Claims (10)

1. A method for calculating the domestic sewage collection rate in urban areas comprises the following steps:
s1, data collection: the method comprises the steps of planning a city in a town area, the total amount of urban domestic water, the amount and quality of sewage discharged by industrial enterprises, the amount and quality of sewage discharged by large-scale livestock farms, the amount and quality of water collected by initial rainwater, the water collection range, the water inlet amount and quality of centralized sewage treatment facilities in the town area, the amount and quality of sewage collected by centralized sewage treatment facilities in the town area and wharf sewage, and the data collection of the amount and quality of sewage delivered to the centralized sewage treatment facilities in the town area outside the town area;
s2, calculating the urban domestic sewage production in the urban-township area according to the data collected in the step S1;
s3, calculating the domestic sewage COD collection amount of the centralized sewage treatment facility in the urban area according to the data collected in the step S1;
s4, calculating the collection amount of domestic sewage in the urban area according to the data collected in the step S1;
s5, calculating the domestic sewage collection rate in the urban area according to the data collected in the step S1.
2. The method for calculating the collection rate of domestic sewage in urban areas according to claim 1, wherein the method comprises the following steps: the step of calculating the urban domestic sewage production amount in step S2 is as follows:
a1, calculating the total quantity Q of domestic water General assembly ；
Q General assembly ＝Q Public +Q Self-inferior +Q Steam generating device (1)
In the formula (1), Q General assembly For accounting for regional total domestic water, Q Public For public water supply, Q Self-contained Water consumption, Q, for self-contained water consumers Steam generating device Water consumption for steam; wherein the steam usage is steam water usage collected from an area outside of an accounting area;
a2, calculating the sewage yield Q Production of sewage ；
Q Production of sewage ＝Q General assembly ×α (2)
In the formula (2), Q Production of sewage Calculating the amount of the domestic sewage generated in the region, wherein alpha is the sewage breaking coefficient of the domestic sewage; wherein，0.8≤α≤0.9。
3. The method for calculating the collection rate of domestic sewage in urban areas according to claim 1, wherein the method comprises the following steps: the COD collection amount M of the domestic sewage of the centralized sewage treatment facility in the step S3 Raw material The calculation comprises the total COD collection amount M of the centralized sewage treatment facility Plant (S.A.) Deducting COD collection amount M of industrial enterprise of centralized sewage treatment facility Rabbet (tongue) Livestock and poultry breeding COD collection amount M of centralized sewage treatment facility Livestock and poultry Initial rainwater COD collection amount M of centralized sewage treatment facility Chu Yu COD collection amount M of sewage of ship and wharf Ship and yard And COD collection amount M outside the accounting region Outer cover The specific calculation formula is as follows:
M raw material ＝M j --M Rabbet (tongue) -M Livestock and poultry -M Chu Yu -M Ship and yard -M Outer cover (3)
4. The method for calculating the collection rate of domestic sewage in urban areas according to claim 3, wherein the method comprises the following steps: the total COD collection amount of the centralized sewage treatment facility is calculated according to the following formula:
M plant (S.A.) ＝Q Plant inlet ×C Plant inlet (4)
In the formula (4), M Plant (S.A.) For the central sewage treatment facility COD in the accounting area to collect the total amount, Q Plant inlet For accounting water inflow of centralized sewage treatment facilities in the region, C Plant inlet Is the COD concentration of the inlet water of the centralized sewage treatment facility.
5. The method for calculating the collection rate of domestic sewage in urban areas according to claim 3, wherein the method comprises the following steps: the COD collection of the industrial enterprise of the centralized sewage treatment facility is calculated according to the following formula:
Figure RE-FDA0003730331910000021
in the formula (5), M Rabbet (tongue) For accountingRegional access to COD volume, Q, of industrial enterprises in centralized sewage treatment facilities Enterprise i For the ith family, there is an automatic on-line monitoring enterprise's sewage take-over amount into the centralized sewage treatment facility, C Enterprise i The COD concentration, Q of the corresponding connecting pipe of the enterprise is automatically monitored on line Enterprise without j The sewage take-over quantity of the jth enterprise which enters the centralized sewage treatment facility without automatic online monitoring is C Enterprises without j And the COD concentration correspondingly taken over by the enterprise is automatically monitored on line for the jth family.
6. The method for calculating the collection rate of domestic sewage in urban areas according to claim 3, wherein the method comprises the following steps: the livestock and poultry breeding COD collection amount of the centralized sewage treatment facility is calculated according to the following formula:
Figure RE-FDA0003730331910000022
in formula (6), M Livestock and poultry For accounting COD amount, Q, of livestock and poultry farm accessing centralized sewage treatment facilities in the region Livestock and poultry i Sewage take-over volume for the ith livestock farm to enter the centralized sewage treatment facility, C Livestock and poultry i Corresponding adapter tube COD concentration.
7. The method for calculating the collection rate of domestic sewage in urban areas according to claim 3, wherein the method comprises the following steps: the initial rainwater COD collection amount of the centralized sewage treatment facility is calculated according to the following formula:
M Chu Yu ＝Q Chu Yu ×C Chu Yu ×φ (7)
in formula (7), M Chu Yu The amount of COD, Q, of the rainwater entering the centralized sewage treatment facility for initial pollution Chu Yu Amount of sewage for initial rainwater to enter centralized sewage treatment facility, C Chu Yu The COD concentration of the initial rainwater is shown, and phi is the comprehensive runoff coefficient; q Chu Yu The rainfall is 20 mm-30 mm thick at the initial stage of one-time rainfall; c Chu Yu The value of (a) is 200-500 mg/L; phi is 0.5-0.9.
8. The method for calculating the collection rate of domestic sewage in urban areas according to claim 3, wherein the method comprises the following steps: the COD collection amount of the sewage of the ship and the wharf is calculated according to the following formula:
M ship and yard ＝Q Ship and yard ×C Ship and yard (8)
In formula (8), M Ship and yard For accounting COD collection of wharf and ship sewage in the region, Q Ship and yard Collecting sewage quantities for docks and ships in accounting areas, C Ship and yard Collecting the COD concentration of the sewage for ships and docks.
9. The method for calculating the collection rate of domestic sewage in urban areas according to claim 3, wherein the method comprises the following steps: the COD collection amount outside the accounting area is calculated according to the following formula:
Figure RE-FDA0003730331910000031
in formula (9), M Outer cover For conveying COD amount, Q, of centralized sewage treatment facilities outside accounting area Outer i Amount of sewage to be delivered outside the accounting area into a centralized sewage treatment facility C Outer i Is its corresponding COD concentration.
10. The method for calculating the domestic sewage collection rate in the urban area according to claim 1, wherein the method comprises the following steps: the steps of calculating the collection amount of the domestic sewage in the urban area in the step S4 and the collection rate of the domestic sewage in the urban area in the step S5 are as follows:
b1, calculating the domestic sewage collection amount;
Q collection of life ＝M Raw material /C Life school model (10)
In the formula (10), Q Collection of life For accounting regional domestic sewage collection amount, C Life check Checking the concentration of the domestic sewage COD in the checking area; m Raw material Collecting amount of domestic sewage COD for a centralized sewage treatment facility; wherein when administrative office facilities are plannedC when the land occupation is less than or equal to 1.3% of the planned land occupation of the central urban area Life check The value of (A) is 350 mg/L; when the planned land occupation of the administrative office facilities accounts for more than 1.3 percent of the planned land occupation of the central urban area, C Life check Is 420 mg/L;
b2, calculating the domestic sewage collection rate;
η collection of life ＝Q Collection of life /Q Raw sewage (11)
In the formula (11), eta Collection of life For accounting regional domestic sewage collection rate, Q Production of sewage And calculating the production amount of the domestic sewage in the region.
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CN109853704A (en) * 2019-03-14 2019-06-07 河海大学 A kind of urban sewage system problem diagnosis method
KR20210000651A (en) * 2020-03-09 2021-01-05 대한민국 (관리부서 : 환경부 국립환경과학원장) Apparatus and method for managing pollution source data from human living

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