CN108399494A - Combined system regional pollution load abatement interception ratio determines method - Google Patents
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
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- G06Q10/06—Resources, workflows, human or project management; Enterprise or organisation planning; Enterprise or organisation modelling
- G06Q10/063—Operations research, analysis or management
- G06Q10/0639—Performance analysis of employees; Performance analysis of enterprise or organisation operations
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- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F1/00—Methods, systems, or installations for draining-off sewage or storm water
- E03F1/001—Methods, systems, or installations for draining-off sewage or storm water into a body of water
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06Q—INFORMATION AND COMMUNICATION TECHNOLOGY [ICT] SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES; SYSTEMS OR METHODS SPECIALLY ADAPTED FOR ADMINISTRATIVE, COMMERCIAL, FINANCIAL, MANAGERIAL OR SUPERVISORY PURPOSES, NOT OTHERWISE PROVIDED FOR
- G06Q50/00—Systems or methods specially adapted for specific business sectors, e.g. utilities or tourism
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- G06Q50/26—Government or public services
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A20/00—Water conservation; Efficient water supply; Efficient water use
- Y02A20/152—Water filtration
Abstract
The invention discloses combined system regional pollution load abatement interception ratios to determine method, includes the following steps：S1：According to the water quality objective of receiving water body, the water environment dynamic capacity under the target is calculated；S2：Determine analysis combined system region dry season sewage quantity and crucial water quality index；S3：Based on the suitable interception ratio of receiving water body water environment dynamic capacity process choosing；S4：Combined sewer overflow pollution type and Vatch basin pollution load of overflow are analyzed to receiving water body water quality impact.Above-mentioned S3 S4 steps are repeated until reaching regional pollution load cuts down target if pollution load of overflow is beyond receiving water body environmental capacity of water load abatement target；In being applied to practical river water contamination control if load cuts down realization of goal and administering.Advantageous effect of the present invention：Combined system regional pollution load is cut down to the determination precise quantification of interception ratio, proposes that interception ratio determines method so that combined system regional pollution load cuts down formulation more science, the accurate, economy of interception ratio.
Description
Technical field
The present invention relates to regional water pollution controls and Treatment process field, it particularly relates to which a kind of combined system region is dirty
Contaminate the determination method of load abatement interception ratio.
Background technology
In the construction of China's sewerage system, combined system is the row for collecting and conveying stain disease with the same pipe duct system
Water mode is divided into and directly lets out formula and shutoff type.Wherein, single flow combined drainage system is seriously polluted to surrounding water, substantially quilt
Transformation.Interceptive combined system drainage system is to build the main pipe that shuts off on bank of bordering on the river, and overflow well and sewage plant, fine day and drop is arranged
All sewage at rain initial stage are all delivered to sewage plant, and water body is discharged into after processing.As rainfall increases, runoff increases, and works as mixing
After conveyance power of water of the discharge of sewage more than the main pipe that shuts off, part combined sewage is discharged into water body, this system mesh through overflow well spilling
Preceding application is wider.
Currently, interceptive combined system drainage system is in China city generally existing, but combined system tube overflow pollution problem
It is not solved effectively always.Combined system tube overflow sewage is made of dry season sewage and rainwater, and wherein dry season sewage includes life
Sewage and industrial wastewater living.In dry season, since flow is smaller in pipeline, flow velocity is relatively low, is also easy to produce precipitation, and some of the contaminants are deposited on
Pipe duct bottom；Rainy season, a large amount of rainwater enter combined pipeline, not only bring the pollutant that runoff washes away into, and due to water is larger,
Flow velocity is higher, is partly deposited on the pollutant of pipe duct bottom by rain drop erosion, causes pollutant concentration in pipeline significantly raised, therefore
Combined system tube overflow sewage it is in line enter river will influence receiving water body water quality.
Interception ratio refers to the ratio of amount of rainfall and dry flow sewage amount that combined drainage system is retained in rainfall.It is cutting
In the case that stream multiple is smaller, combined system tube overflow will occur, overflow sewage will be directly discharged into surrounding city water body, pollution
Receiving water body, and if interception ratio value is excessive, construction investment amount can be significantly increased, and cause unnecessary waste.Current
In design, the value of interception ratio is promulgated generally according to house and town and country construction portion《Code for design of outdoor sewerage engineering》, value 1 ~ 5
Between or with reference to domestic and foreign experience carry out value, uncertain factor is many.As it can be seen that how special according to combined system Regional Rainfall
Sign, is based on receiving water body water environment dynamic capacity, and science accurately selects economic suitable interception ratio for regional water pollution
Control and improvement are particularly important.
Invention content
The object of the present invention is to provide a kind of combined system regional pollution load abatement interception ratios to determine method, to overcome mesh
Preceding deficiencies of the prior art.
To realize the above-mentioned technical purpose, technical method of the invention is realized in：
Combined system regional pollution load abatement interception ratio determines method, includes the following steps：
S1：The water environment dynamic capacity under the target, including dry season and rainy season are calculated according to the water quality objective of receiving water body；
S2：Pass through data collection and field investigation, analysis and Control region dry season effluent sewage amount（Sanitary sewage and industrial wastewater）, and
Its main water quality index variation characteristic；
S3：Based on receiving water body different times environmental capacity of water, analyzed area characteristics of rainfall calculates and shuts off under different interception ratios
Amount calculates overflow water, selects best interception ratio；
S4：Dry season and rainy season combined sewer overflow features of pollution and Vatch basin pollution load of overflow are analyzed to receiving water body water quality impact, into
And it verifies interception ratio and chooses whether properly.
If pollution load of overflow beyond receiving water body environmental capacity of water load abatement target if repeat above-mentioned S3-S4 steps until
Reach regional pollution load abatement target；It is applied to practical river water contamination treating if load cuts down realization of goal
In.
Further, to calculate the water environment under the target dynamic for the water quality objective based on receiving water body in the step S1
State calculation of capacity formula is：
In formula：W is the environmental capacity of water for calculating section, and Cs is water quality objective, C0For section initial concentration, Q0For river discharge,
U is mean flow rate, and K is comprehensive degradation coefficient, and x is m-th of distance of the pollution sources away from control section, qmFor m-th pollution sources
Flow；Wherein river discharge Q0Calculating using the 7Q10 methods in environment flow selection-hydrology method.
Further, receiving water body water environment dynamic capacity process choosing interception ratio is based in the step S3, into
One step includes：
The characteristics of rainfall of combined system region at least three calendar year is analyzed, the catchment number and drop of the different daily rainfalls of drop are included
Rainfall statistics, different rainfall intensity rainfall durations and rainfall count；Combined closure system uses《Combined flow system sewage intercepting chamber designs
Regulation》Middle sewage combined closure system calculation formula is calculated, and formula is as follows：
Q = Qh(n0+1)
In formula：Q is sewage combined closure system, m3/s；QhFor dry flow sewage design discharge, m in combined pipeline3/s；n0For interception ratio, 1
~5。
More preferably to establish the relationship of rainfall and combined closure system, converted to combined closure system using following formula, it is specific as follows：
ih= Qh/ (R×F×24)
In formula：ihFor the equivalent rainfall intensity of dry season sewage, mm/h；QhFor combined pipeline dry season sewage quantity, m3/d；R builds up for city
Area is averaged runoff coefficient, generally takes 0.5-0.8；F is the range construction land area that shuts off, km2。
Further, dry season and rainy season combined sewer overflow features of pollution are analyzed in the step S4, are further comprised：
S4.1 dry season combined sewer overflow pollution types
Qh=q1+q2+…+qi
In formula：Q is to be delivered to sewage treatment plant's water, QhFor dry season sewage quantity, qiFor single dry season sewage quantity；Q=Qh≤ Qw,
Regeneration water factory can be fully entered.
S4.2 rainy season combined sewer overflow pollution types
Q′1=q '1+q′2+…+q′i
In formula：Q’1For Vatch basin overflow water；q’iFor single Vatch basin overflow water, this part pollution load of overflow overflows for Vatch basin
Stream pollution, has a direct impact quality of river water.
As Q≤QwWhen, sewage treatment plant can whole receivings convey waters, at this point, that there is no overflows is dirty for sewage treatment plant
Dye；Work as Q>QwWhen, most receive water greatly beyond sewage treatment plant, need to carry out surmounting processing, sewage treatment plant will generate overflow at this time
Pollution.
Q′2=Q-Qw
Q is to be delivered to sewage treatment plant's water, Q’ 2Most to receive the overflow water of outlet capacity greatly beyond sewage treatment plant；This portion
Divide pollution load of overflow different due to sewage treatment plant surmounts water and surmounts the difference of mode.
After above-mentioned technical method, the present invention has following advantageous effect：The present invention bears combined system regional pollution
Lotus cuts down the determination precise quantification of interception ratio, proposes that the interception ratio based on receiving water body water environment dynamic capacity process is formulated
Method.The present invention will make combined system regional pollution load cut down formulation more science, the accurate, economy of interception ratio.
Description of the drawings
It in order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only some implementations of the present invention
Example, for those of ordinary skill in the art, without creative efforts, can also obtain according to these attached drawings
Obtain other attached drawings.
Fig. 1 is the combined system regional pollution load based on receiving water body water environment dynamic capacity process of the embodiment of the present invention
Abatement interception ratio determines flow chart；
Fig. 2 is that certain city 2012-2014 annual rainfalls of the embodiment of the present invention are lasted and rainfall statistics；
Fig. 3 is the region combined sewer overflow pollution type analysis chart of the embodiment of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, all other embodiment that those of ordinary skill in the art are obtained belong to what the present invention protected
Range.
As shown in Figs. 1-3, the combined system regional pollution load abatement interception ratio described in the embodiment of the present invention determines method,
Include the following steps：
S1：The water environment dynamic capacity under the target, including dry season and rainy season are calculated according to the water quality objective of receiving water body；
S2：Pass through data collection and field investigation, analysis and Control region dry season effluent sewage amount（Sanitary sewage and industrial wastewater）, and
Its main water quality index variation characteristic；
S3：Based on receiving different times water body environmental capacity of water, analyzed area characteristics of rainfall calculates and shuts off under different interception ratios
Amount calculates overflow water, selects best interception ratio；
S4：Dry season and rainy season combined sewer overflow features of pollution and Vatch basin pollution load of overflow are analyzed to receiving water body water quality impact, into
And it verifies interception ratio and chooses whether properly.
Below by northern certain river water contamination control with for improvement, detailed description is held based on receiving water body water environment dynamic
The determination method of the combined system regional pollution load abatement interception ratio of amount process：
(1) receiving water body water environment dynamic capacity calculates
Environmental capacity of water refers to the amount that water environment unit can accommodate pollutant under specific environmental goals, also refers to environment unit
The amount for the pollutant that can allow under the premise of making function itself be unlikely to destruction by self-characteristic.Water environment in this programme
Capacity, which is calculated, mainly to be used《River water environmental calculation of capacity model analysis》In following formula (control section method) counted
It calculates：
In formula：W is the environmental capacity of water for calculating section, CsFor water quality objective, C0For section initial concentration, Q0For river discharge, u
For mean flow rate, K is comprehensive degradation coefficient, and x is m-th of distance of the pollution sources away from control section, qmFor m-th pollution sources
Flow.What the selection method of river discharge was used is environment flow selection-hydrology method；Hydrology method is generally with history stream
Amount is foundation, is suitable for the objective management of low flow streams.Flow is using field investigation data and regional water in this programme
Resource accounts the data on flows being combined.
1 receiving water body different units environmental capacity of water of table is calculated
(2) Regional Rainfall characteristic synthetic is analyzed
Rainfall refers to the water depth for dropping to ground within a certain period of time, and unit is indicated with millimeter.By to the city nearly 3 years
Catchment number is visible with rainfall statistical analysis：2012-2014 annual rainfall numbers of days are about 108 days/year, wherein 2013 drop
Rainy day number is most, is 124 days；City's Multi-year average precipitation is about 585 days, 2012,2013 annual rainfalls be about 730
Mm is the high flow year, and 2014 annual rainfalls are 446 days, average less than for many years, are the low flow year；Daily rainfall focuses mostly in 0-
10mm, accounts for about the 60% of the total number of days of rainfall, and daily rainfall is more than being no more than 10 days for 20mm.
Rainfall intensity refers to the rainfall in unit time period, in terms of milli m/min or milli m/hour.By to the nearly 3 years (2012- in the city
2014) rainfall intensity and rainfall are analyzed as it can be seen that rainfall intensity focuses mostly in 0-3.0mm/h, account for about rainfall duration
88.3%, rainfall accounts for about the 90.1% of annual rainfall.Region annual rainfall intensity is relatively low；High rainfall intensity lasts short, drop
Water inventory is low.
Certain the market day catchment number of table 2 and rainfall statistical distribution
（3）Combined closure system is with interception ratio than selecting
When taking interception ratio n0=1, it is equivalent to 0.52 × 1=0.56（mm/h）Rainfall, when rainfall intensity be less than 0.52 mm/h
When, rainwater and sewage all can cut by cutting dirty pipe.Whole year shuts off 189.7 mm of rainfall, accounts for 30.3%.
When taking interception ratio n0=1.5, it is equivalent to 0.52 × 1.5=0.78（mm/h）Rainfall, when rainfall intensity is less than
When 0.78 mm/h, rainwater and sewage all can cut by cutting dirty pipe.Whole year shuts off 243.6 mm of rainfall, accounts for 38.04%.
When taking interception ratio n0=2, it is equivalent to 0.52 × 2=1.04（mm/h）Rainfall, when rainfall intensity be less than 1.04
When mm/h, rainwater and sewage all can cut by cutting dirty pipe.Whole year shuts off 283.9 mm of rainfall, accounts for 44.3%.
When taking interception ratio n0=2.5, it is equivalent to 0.52 × 2.5=1.3（mm/h）Rainfall, when rainfall intensity is less than
When 1.3 mm/h, rainwater and sewage all can cut by cutting dirty pipe.Whole year shuts off 316.0 mm of rainfall, accounts for 49.4%.
When taking interception ratio n0=3, it is equivalent to 0.52 × 3=1.56（mm/h）Rainfall, when rainfall intensity be less than 1.56
When mm/h, rainwater and sewage all can cut by cutting dirty pipe.Whole year shuts off 343.6 mm of rainfall, accounts for 53.7%.
According to region built-up areas present situation sewage quantity and it is 3 years nearly in hour rainfall characteristic distributions, consider at present it is right
City overland runoff contamination control is urgent, cuts dirty main pipe construction cost, and construction of wastewater treatment plant cost and rainy day operation are negative
Lotus is impacted, and interception ratio n is taken0=2, it is economical rationality, can shut off 283.9 mm of rainfall, account for annual rainfall（640.5）'s
44.3%。
Dirty main pipe difference interception ratio is cut in 3 region of table can shut off rainfall
(4) combined sewer overflow pollution type is analyzed
In dry season, Q=Qh≤Qw, regeneration water factory can be fully entered.Non- rainfall number of days 256 days, accounts for about 70.1%, and there is no overflow
Stream pollution.
In rainy season, Vatch basin pollution load of overflow：Q’ 1It is Vatch basin pollution load of overflow, to quality of river water for Vatch basin overflow water
It has a direct impact；Sewage plant surmounts pollution load of overflow：As Q≤QwWhen, sewage treatment plant can whole receivings convey waters, sewage
Pollution load of overflow is not present in treatment plant；Work as Q> QwWhen, most receive water greatly beyond sewage plant, need to carry out surmounting processing, it at this time will production
Raw pollution load of overflow（Fig. 3）.
（5）Dirty well kick pollution is cut to water quality of river impact analysis
Interception ratio is analyzed with water quality of river accessibility of target, mainly considers environmental capacity of water, examination section master control water quality index
And whether the factors such as city's rainfall calculate water quality of river target under the scene and according to the selection of interception ratio
It is reachable.
This place Con trolling index COD main to pollution load of overflow and ammonia nitrogen, have carried out overflow load and confluence section water environment is held
The estimation of amount.Water quality of river target COD≤30 mg/L, 1.5 mg/L of ammonia nitrogen, as receiving water body environmental capacity of water and load
Cut down the water quality index calculated（The water quality objective determined according to engineering proposal）.
742.7 mm of annual rainfall in 2013, is higher than city's mean annual precipitation（595 mm）20%, it is the high flow year.
It is annual>5.0 mm rainy days are 45 days,>10 mm rainfalls number of days 23 days, wherein 20 days 5-9 months.
It is n in interception ratio0In the case of=2, whole year generates overflow number and amounts to 23 times, is mainly distributed on having for the 6-9 months
17 times.Wherein rainfall interval 1 day has 11 times, is distributed in June 24 to July 16, August 15 days, August 16 days and August 29
Day.1 time of rainfall interval 2 days is 22 daily rain amount event in June.The 3 days catchments in interval have 2 times, are happened at August 28 days and 9
The moon 2.Rainfall interval 4 days has 2 times, appears in August 8 days and July 28；The interval number of days of other catchments is respectively 7
It, is September 23.
It is obtained by the catchment statistics to 17 generation pollution load of overflow, combined system built-up areas overflow load total amount COD
About 386 t, ammonia nitrogen are about 2.59 t.Wherein 6 times of overflow load COD 0-10 t, 10-15 t's has 3 times, 15-25 t's
3 times, it is more than 5 times of 25 t；9 times of ammonia nitrogen 0-0.1 t, 4 times of 0.1-0.2 t, it is more than 4 times of 0.2 t.
Verification environmental capacity of water in 17 overflow events of generation, there is 11 with the difference that overflow enters river load in terms of COD
Secondary overflow load can be decomposed by the self purification process of the section ecosystem, not influence the design standard of water quality of river（I.e.
COD is less than 30 mg/L）；From the point of view of ammonia nitrogen, this 17 pollution load of overflow events can be completed by section self-cleaning, not influence water quality
The requirement of goal-setting.
There are 6 pollution load of overflow events, enters the environmental capacity of water that river COD has been more than section.The reason of generating such case, it is main
If being measured when secondary rainfall big（34.5 mm of average out to）And caused by rainfall interval time is shorter（6 times overflow rainfall interval is 1
It）.
It is found after this 6 pollution load of overflow events to be entered to the analysis of the pollutant concentration before river, overflow enters the COD mean concentrations in river
For 44.3 mg/L.One side COD concentration values are relatively low, and it is mostly particulate form, Yi Fa to enter the pollutant in river with storm runoff
Raw sedimentation.By the subsiding and purifying of the section ecosystem, above-mentioned 6 pollution load of overflow events have substantially no effect on receiving water body section water
The accessibility of matter target.
Claims (7)
1. combined system regional pollution load abatement interception ratio determines method, which is characterized in that include the following steps：
S1：According to the water quality objective of receiving water body, the water environment dynamic capacity in dry season and rainy season under the target is calculated；
S2：Determine analysis combined system region dry season sewage quantity and crucial water quality index；
S3：Based on the suitable interception ratio of receiving water body water environment dynamic capacity process choosing；
S4：Dry season and rainy season combined sewer overflow pollution type and Vatch basin pollution load of overflow are analyzed to receiving water body water quality impact, is tested
It demonstrate,proves and determines suitable interception ratio.
2. combined system regional pollution load abatement interception ratio according to claim 1 determines method, which is characterized in that step
The water quality objective based on receiving water body described in rapid S1 calculates the water environment dynamic capacity calculation formula under the target and is：
In formula：W is the environmental capacity of water for calculating section, and Cs is water quality objective, C0For section initial concentration, Q0For river discharge, u
For mean flow rate, K is comprehensive degradation coefficient, and x is m-th of distance of the pollution sources away from control section, qmFor the stream of m-th of pollution sources
Amount；Wherein river discharge Q0Calculating using the 7Q10 methods in environment flow selection-hydrology method.
3. combined system regional pollution load abatement interception ratio according to claim 1 determines method, which is characterized in that step
Middle dry season sewage described in rapid S2 includes sanitary sewage and industrial wastewater.
4. combined system regional pollution load abatement interception ratio according to claim 1 determines method, which is characterized in that step
The selection of middle interception ratio described in rapid S3, including：
The characteristics of rainfall of combined system region at least three calendar year is analyzed, the catchment number and drop of the different daily rainfalls of drop are included
Rainfall statistics, different rainfall intensity rainfall durations and rainfall count；Combined closure system calculation formula formula is as follows：
Q = Qh (n0+1)
In formula：Q is sewage combined closure system, m3/s；QhFor dry flow sewage design discharge, m in combined pipeline3/s；n0For interception ratio, 1 ~
5。
5. combined system regional pollution load abatement interception ratio according to claim 1 determines method, which is characterized in that step
Analysis dry season combined sewer overflow pollution type described in rapid S4, calculation formula are as follows：
In formula：Q is to be delivered to sewage treatment plant's water, QhFor dry season sewage quantity, qiFor single dry season sewage quantity.
6. combined system regional pollution load abatement interception ratio according to claim 1 determines method, which is characterized in that step
Analysis rainy season combined sewer overflow pollution type described in rapid S4, calculation formula are as follows：
In formula：Q’ 1For Vatch basin overflow water；q’ iFor single Vatch basin overflow water.
7. combined system regional pollution load abatement interception ratio according to claim 1 determines method, which is characterized in that step
Vatch basin pollution load of overflow described in rapid S4 analyzes receiving water body water quality impact, main to consider water environment dynamic capacity, region
Rainfall and production confluence feature factor, according to the selection of interception ratio, calculate under the scene receiving water body water pollution control with
In governance process, combined system regional pollution load cuts down whether target is reachable, and then verifies the interception ratio selected.
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