CN114624407B - Method for measuring and calculating external water quantity of district sewage system based on typical land parcels - Google Patents
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Abstract
The invention discloses a method for measuring and calculating the external water quantity of a sewage system in a patch area based on a typical land block, which comprises the following steps: (1) Arranging monitoring points and acquiring flow and water quality data of the monitoring points; the monitoring points comprise primary monitoring points and secondary monitoring points; (2) Screening a typical plot and measuring and calculating a water quality concentration background value of the sewage in the slice area; (3) measuring and calculating the water quality concentration reference value of the external water; and (4) measuring and calculating the external water quantity. The invention can rapidly and accurately calculate the external water quantity in the sewage system, and has less investment and cost.
Description
Technical Field
The invention relates to a sewage pipeline running state diagnosis technology in a sewage system, in particular to a method for measuring and calculating the external water quantity of a sewage system in a slice area based on a typical land block.
Background
In recent years, with the rapid improvement of urban degree of China, urban sewage treatment facilities basically realize full coverage, urban sewage treatment rate is also remarkably improved, and urban sewage treatment systems are key infrastructures for guaranteeing urban sustainable development. However, the urban sewage system has the problems of inadequate construction and maintenance of a sewage pipe network, insufficient sewage collection rate, invasion of external water and the like, so that the inflow water concentration of the urban sewage plant is obviously lower than a design value, the normal operation and efficiency of the sewage treatment system are seriously influenced, and the urban sustainable development and ecological civilization construction are adversely influenced.
The external water refers to underground water, river water, spring water and other leaked pipeline water entering a sewage system through a damaged sewage pipeline, a pipeline joint and an inspection well; the external water may also flow through other nearby rain pipes, construction sites, streams and other waterways. Extraneous water problems worsen with the aging of the sewage system, and specific influencing factors include: the service life of the pipeline system, the quality of the pipe, the construction method, the construction quality, the change of the groundwater level and the like. Foreign water enters the sewage system, so that the water quality concentration of the sewage treatment plant and the sewage treatment efficiency of the sewage treatment plant are affected, meanwhile, the running risk of a pipe network and the overflow risk in rainy days are increased, and the treatment of black and odorous water bodies and the quality improvement and synergy of the sewage system are both negatively affected. Therefore, the comprehensive judgment of the running state of the pipeline sewage disposal diversion and the sewage system is very important.
The flowmeter monitoring method is the earliest monitoring method used in a river water (groundwater) infiltration sewage main pipe and is also one of the simplest methods. The method for simultaneously monitoring the upstream water inflow, the water quality and the downstream water quality can only aim at the main pipe part, and is difficult to comprehensively calculate the water quality inside and outside the sheet area, so that certain defects exist in exploring and summarizing the sewage system problem. Therefore, the patent aims to design a method for measuring and calculating the external water quantity of the sewage system in the area based on the typical plots, and the water quality data of the sewage in each plot in the monitored area can be better known through the selection of the typical plots and the detection of the water quality, the external water quantity and the external water quantity in the area are calculated, and the influence of the external water and the source water quality on the water quality of the sewage system in the area is comprehensively evaluated.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides a method for measuring and calculating the external water quantity of a piece area sewage system based on a typical plot, which can quickly and accurately calculate the external water quantity in the sewage system, is widely applicable to large-scale urban drainage systems in China, provides a certain basis for the water investigation inside and outside the piece area and the sewage system transformation, and has low investment and cost.
In order to achieve the purpose, the invention relates to a method for measuring and calculating the external water quantity of a piece area sewage system based on a typical land block, which comprises the following steps:
(1) Laying monitoring points and obtaining flow and water quality data of the monitoring points: selecting a monitoring area in a patch of the sewage system, and selecting a plurality of monitoring points in the monitoring area; carrying out flow monitoring and water quality detection on each monitoring point to obtain the flow of the monitoring point and the water quality of the monitoring point;
The monitoring points comprise primary monitoring points and secondary monitoring points; the method for setting the primary monitoring point and the secondary monitoring point comprises the following steps: according to the topological relation of the sewage pipe network, the sewage collecting position at the tail end of the downstream end of the sewage main pipe is used as a first-stage monitoring point, a sewage flow threshold of the monitoring point is set, and a sewage branch pipe with the water quantity exceeding the sewage flow threshold is selected as a secondary monitoring point;
(2) Screening a typical plot and measuring and calculating a water quality concentration background value of the sewage in the slice region: dividing a zone into a plurality of plots, obtaining the water supply amount of each plot, classifying the plots according to land types, and selecting a typical plot from the plots of each land type according to the water supply amount; calculating the water supply quantity ratio of each land type through the water supply quantity of each typical land, and carrying out flow monitoring and water quality detection on the sewage discharged from the typical land, so as to calculate the water quality background value of the sewage of each land type; calculating the water quality concentration background value of the wastewater in the slice area by combining the water quality background value of the wastewater in each land type and the water supply amount duty ratio of each land type;
(3) Measuring and calculating a water quality concentration reference value of the external water: and detecting the water quality of the external water from different sources in the monitoring area to obtain the water quality of the external water, and calculating the water quality concentration reference value of the external water according to the water quality of the external water.
(4) Measuring and calculating the external water quantity: and calculating the water inflow and outflow amount of the sewage system according to the water quality characteristic factor method by utilizing the background value of the water quality concentration of the sewage in the area, the flow rate of the monitoring point, the water quality of the monitoring point and the water quality concentration reference value of the external water.
In particular, the water quality detection method is to measure the ammonia nitrogen water quality concentration.
In particular, the water quantity monitoring method is to monitor the water quantity by a Doppler flow meter.
In particular, the foreign water includes river water, groundwater, tap water, construction water.
In particular, the land types include residential life, administrative business, industrial enterprises.
Particularly, in the step (1), the method for carrying out flow monitoring and water quality detection on the first-stage monitoring point comprises the steps of carrying out flow monitoring and water quality detection once in the peak period of water consumption in dry days and the low peak period of water consumption in dry days respectively; in the step (2), the method for monitoring the flow and detecting the water quality of the typical land parcels comprises the step of monitoring the flow and detecting the water quality once in the peak period of the water consumption period and the low peak period of the water consumption period respectively.
In particular, the specific method for selecting the typical block in the step (2) is as follows: and (3) summarizing and counting according to water supply data in the block provided by the water service company, respectively calculating the water supply proportion of each land type, sequencing the water supply of each land according to the land type, and selecting a plurality of land blocks with larger water consumption and uniform spatial distribution of each selected land block as typical land blocks under the land type.
In particular, in the step (2), the calculation formula of the water quality background value of the sewage of each land type corresponding to each land type is as follows:
Cj＝(Cj1*Qj1+Cj2*Qj2+……Cjn*Qjn)/(Qj1+Qj2+……Qjn),
wherein, C j represents the water quality background value of the sewage of each land type of the land type, and C jn represents the ammonia nitrogen concentration of the land block of the land type; q jn represents the amount of sewage water in such land-based plots.
In particular, the calculating method for calculating the water quality concentration reference value of the external water in the step (3) is that the external water is subjected to water quality detection to obtain the actual measured ammonia nitrogen concentration of the external water quality, and an arithmetic average value is calculated to obtain the water quality concentration reference value of the external water.
In particular, in the step (4), the specific calculation method of the water inflow amount inside and outside the sewage system comprises the following steps:
the external water quantity of a certain monitoring point is calculated by the following formula:
Qw＝(Cs-Cd)*Qs/(Cd-Cw)，
Wherein Q w represents the amount of extraneous water; c s represents the ammonia nitrogen concentration of a certain monitoring point; q s represents the average water quantity at a certain monitoring point; c d represents a sewage water quality concentration background value; c w represents a foreign water quality concentration reference value;
The external water quantity of all monitoring points is calculated through the method.
After the water quantity of the external water is calculated, the main problem of the influence of the water quality in the sewage system of the film area can be comprehensively judged through the water quantity of the external water. The comprehensive evaluation of the sewage system is to analyze main problems in the area, comprehensively judge main factors of water quality influence in the area by utilizing water quality, water quantity data and external water quantity measurement and calculation in a typical land block, provide data support for the investigation of water inside and outside the area, detect the section of sewage pipe by adopting CCTV (continuous traffic light) and QV (quality control) periscope and other technologies after calculation, finally find the damaged position of the sewage pipe, and survey the low concentration reason of the land block by tracing the source aiming at the area with lower water quality of the land block.
The invention has the following advantages:
(1) The invention only needs to monitor the flow and water quality in the main sewage pipe and the branch sewage pipe of the slice area as the primary monitoring point and the secondary monitoring point respectively, does not need to monitor along the way and each branch pipe, and can save the cost of monitoring needed by mass flowmeter installation.
(2) According to the method, the water quality background value of the sewage of each land type is calculated by adopting the typical land block, so that the water quality and water quantity inspection of all land blocks in the zone is avoided, meanwhile, the water quality condition of the sewage of the land block in the zone can be comprehensively reflected according to the selected typical land block, the water quality problem of the land block under each land type can be systematically screened, the water quality condition of the source head of the zone can be comprehensively evaluated, and the calculated water quality concentration background value of the sewage of the zone is reasonable and accurate.
(3) The invention can calculate the water quantity of the incoming water inside and outside the sheet area, can analyze the water problem existing at the upstream of the branch pipe, can identify the water infiltration quantity condition of the incoming water in the area and on the branch pipe, can improve the operation state diagnosis efficiency of the sewage system, can provide references for subsequent works such as external water investigation, pipeline restoration and the like, and can finally comprehensively judge the main factors of the water quality influence in the sheet area by using typical water quality, water quantity data and external water quantity calculation.
Drawings
FIG. 1 is a schematic diagram of the process of the present invention;
fig. 2 is a schematic diagram of the distribution of primary monitoring points and secondary monitoring points in a monitoring area in an embodiment of the invention.
Detailed Description
The features of the present invention will be further illustrated by way of example only, and not by way of limitation, to the scope of the invention.
Taking a sewage system area in a certain city in southwest as an example, the treatment process of the implementation method of the invention is described.
When the sewage system normally operates, sewage in the sewage pipeline belongs to domestic sewage (including industrial sewage) discharged by various land types, and the entering of 'external water' into the sewage system not only affects the water quality in the sewage pipeline, but also increases the treatment cost of a sewage treatment plant and the rainfall overflow risk, and brings difficulties and challenges to the black and odorous water body treatment work and the quality improvement and efficiency enhancement of the sewage system, and the 'external water' water quality is lower than the original sewage concentration, and the ammonia nitrogen concentration is generally between 0.1 and 3mg/L, so that the water quality background value and the external water quality reference value of the sewage system in a zone can be determined, the water quantity of the external water in the zone can be calculated, and the running condition of the sewage system in the zone can be comprehensively evaluated and data supported.
As shown in fig. 1, the method for measuring and calculating the external water quantity of the patch sewage system based on the typical plot according to the embodiment of the invention comprises the following steps:
(1) Selecting a monitoring area according to factors such as work purposes, sewage system pipe network distribution, sewage flow directions and the like, taking fig. 2 as an example, taking a sewage collecting position at the tail end of a sewage main pipe downstream according to a sewage pipe network topological relation, namely taking the sewage main pipe (all sewage in a collecting sheet area) of the monitoring area as a primary monitoring point SJD1, arranging secondary monitoring points (CJD 1, CJD2 and CJD 3) on other large water quantity branch pipes in the monitoring area, and carrying out flow monitoring and water quality detection of a flow meter on each monitoring point; the ammonia nitrogen water quality concentration of SJD1 is C0, and the ammonia nitrogen water quality concentration of other secondary monitoring points is C1, C2 and C3; the method for carrying out flow monitoring and water quality detection on the first-stage monitoring point comprises the steps of carrying out flow monitoring and water quality detection once in the peak period of the water consumption period of the dry day and the low peak period of the water consumption period of the dry day respectively, and increasing the frequency according to actual needs;
(2) The water supply amount data of each land block in the block is acquired, each land block is classified, and the water supply amount data can be divided into resident life, administrative matters and industrial enterprises, typical land blocks are selected, and the specific method for selecting the typical land blocks is as follows: and carrying out summarizing statistics according to water supply data in the water supply areas provided by water service companies, wherein the water supply is tap water supply, the water supply duty ratio of each land type is calculated respectively, the water supply of each land type is sequenced according to the land type, and a plurality of land blocks with larger water consumption and uniform spatial distribution of each selected land block are selected from the water supply duty ratios to serve as typical land blocks under the land type.
The method for carrying out water quality detection and flow monitoring on the typical land parcels comprises the step of carrying out flow monitoring and water quality detection once in the water consumption period peak period and the water consumption period low peak period respectively.
As shown in Table 1, wherein, C j is the water quality background value of resident domestic sewage, C x is the water quality background value of administrative service sewage, and C g is the water quality background value of industrial enterprise sewage.
Taking resident life as an example, the calculation formula of the resident domestic sewage water quality background value corresponding to the resident life is as follows:
Cj＝(Cj1*Qj1+Cj2*Qj2+……Cjn*Qjn)/(Qj1+Qj2+……Qjn),
Wherein, C j represents the water quality background value of resident domestic sewage, and C jn represents the ammonia nitrogen concentration of resident living plots; q jn represents the sewage amount of the residential block. According to the method, the water quality background value C x of the industrial sewage and the water quality background value C g of the industrial sewage are calculated.
As shown in table 2, the water quality background value C d of the wastewater in the slice area was calculated in combination with the water quality background value of the wastewater of each land type and the water supply amount duty ratio of each land type.
TABLE 1 Water quality background value calculation Table for various land types
TABLE 2 calculation table of sewage background value in sheet area
(3) As shown in table 3, the external water in the monitoring area, including river water, groundwater, tap water, and construction water, is subjected to water quality detection to obtain the measured ammonia nitrogen concentration of each external water quality, and an arithmetic average value is calculated to obtain the external water quality concentration reference value C w.
TABLE 3 calculation of water basis weight outside of a wafer area
(4) As shown in Table 4, the water inflow quantity Q w inside and outside the sewage system is calculated according to the water quality characteristic factor method by using the background value C d of the land block sewage in the area, the water quality C s and the water quantity Q s of each monitoring point. The specific calculation method of the water inflow amount inside and outside the sewage system comprises the following steps:
the external water quantity of a certain monitoring point is calculated by the following formula:
Qw＝(Cs-Cd)*Qs/(Cd-Cw)，
Wherein Q w represents the amount of extraneous water; c s represents the ammonia nitrogen concentration of a certain monitoring point; q s represents the average water quantity at a certain monitoring point; c d represents a sewage water quality concentration background value; c w represents a foreign water quality concentration reference value;
The external water quantity of all monitoring points is calculated through the method.
TABLE 4 calculation of water basis weight outside of a wafer area
The external water quantity of the sewage system in the area calculated by the method is 2917.9 tons/day, the sewage pipe in the area is detected by adopting the CCTV, QV periscope and other technologies, the found external water quantity accounts for 85 percent of the measured external water quantity, the method is reasonable and effective, meanwhile, the data support and the investigation guidance are also carried out for the external water investigation work, the collected water quality data of the sewage in the area can be further analyzed, and the problem of the sewage system in the area is comprehensively evaluated.
The invention is not limited to the above-described embodiments, but it should be noted that it is possible for a person skilled in the art to make several improvements and modifications without departing from the technical principle of the invention, which are also considered as the protection scope of the invention.
Claims (2)
1. The method for measuring and calculating the external water quantity of the district sewage system based on the typical land parcels is characterized by comprising the following steps:
(1) Laying monitoring points and obtaining flow and water quality data of the monitoring points: selecting a monitoring area in a patch of the sewage system, and selecting a plurality of monitoring points in the monitoring area; carrying out flow monitoring and water quality detection on each monitoring point to obtain the flow of the monitoring point and the water quality of the monitoring point; the method for detecting the water quality comprises the steps of measuring the ammonia nitrogen water quality concentration;
the monitoring points comprise primary monitoring points and secondary monitoring points; the method for setting the primary monitoring point and the secondary monitoring point comprises the following steps: according to the topological relation of the sewage pipe network, the sewage collecting position at the tail end of the downstream end of the sewage main pipe is used as a primary monitoring point, a sewage flow threshold value is set, and a sewage branch pipe with the water quantity exceeding the sewage flow threshold value is selected as a secondary monitoring point;
the method for carrying out flow monitoring and water quality detection on the first-stage monitoring point comprises the steps of carrying out flow monitoring and water quality detection once in the peak period of water consumption in dry days and the low peak period of water consumption in dry days respectively;
(2) Screening a typical plot and measuring and calculating a water quality concentration background value of the sewage in the slice region: dividing a zone into a plurality of plots, obtaining the water supply amount of each plot, classifying the plots according to land types, and selecting a typical plot from the plots of each land type according to the water supply amount; calculating the water supply quantity ratio of each land type through the water supply quantity of each typical land, and carrying out flow monitoring and water quality detection on the sewage discharged from the typical land, so as to calculate the water quality background value of the sewage of each land type; calculating the water quality concentration background value of the wastewater in the slice area by combining the water quality background value of the wastewater in each land type and the water supply amount duty ratio of each land type; the land type comprises resident life, administrative matters and industrial enterprises;
the method for carrying out flow monitoring and water quality detection on the typical land parcels comprises the steps of carrying out flow monitoring and water quality detection once in the water consumption period peak period and the water consumption period low peak period respectively;
The specific method for selecting the typical land block comprises the following steps: summarizing and counting according to water supply data in a block provided by a water service company, respectively calculating water supply duty ratios of land parcels of each land type, sequencing the water supply of each land parcel according to the land type, and selecting a plurality of land parcels with larger water consumption and uniform spatial distribution of each selected land parcel as typical land parcels under the land type;
The calculation formula of the water quality background value of the sewage of each land type corresponding to each land type is as follows:
Cj=（Cj1*Qj1+Cj2*Qj2+……Cjn*Qjn）/（Qj1+Qj2+……Qjn）,
Wherein, C j represents the water quality background value of the sewage of each land type of the land type, and C jn represents the ammonia nitrogen concentration of the land block of the land type; q jn represents the sewage amount of the land block of the land type;
Measuring and calculating a water quality concentration reference value of the external water: detecting the quality of the external water in the monitoring area to obtain the quality of the external water, and calculating a water quality concentration reference value of the external water according to the quality of the external water; the external water comprises river water, underground water, tap water and construction water;
The method for calculating the water quality concentration reference value of the external water comprises the steps of carrying out water quality detection on the external water to obtain the actual measured ammonia nitrogen concentration of the external water quality, and calculating an arithmetic average value to obtain the water quality concentration reference value of the external water;
(4) Measuring and calculating the external water quantity: calculating the water inflow and outflow amount of the sewage system according to a water quality characteristic factor method by utilizing the background value of the water quality concentration of the sewage in the area, the flow rate of the monitoring point, the water quality of the monitoring point and the water quality concentration reference value of the external water;
The specific calculation method of the water inflow amount inside and outside the sewage system comprises the following steps:
the external water quantity of a certain monitoring point is calculated by the following formula:
Qw=(Cs-Cd)*Qs/(Cd-Cw)，
Wherein Q w represents the amount of extraneous water; c s represents the ammonia nitrogen concentration of a certain monitoring point; q s represents the average water quantity at a certain monitoring point; c d represents a sewage water quality concentration background value; c w represents a foreign water quality concentration reference value;
The external water quantity of all monitoring points is calculated through the method.
2. The method for measuring and calculating the external water quantity of the typical block-based sewage system according to claim 1, wherein the water quantity monitoring method is that water quantity monitoring is carried out through a Doppler flow meter.
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