CN113704932A - Quantitative evaluation method for external water mixing of urban sewage pipe network based on stable isotope - Google Patents

Quantitative evaluation method for external water mixing of urban sewage pipe network based on stable isotope Download PDF

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Publication number
CN113704932A
CN113704932A CN202110799280.7A CN202110799280A CN113704932A CN 113704932 A CN113704932 A CN 113704932A CN 202110799280 A CN202110799280 A CN 202110799280A CN 113704932 A CN113704932 A CN 113704932A
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water
pipe network
isotope
sewage
external water
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王瑞
唐婕
杨继伟
余浩
王敏
李雪飞
霍怡君
甄万顺
陈东威
黄道端
张玥
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PowerChina Huadong Engineering Corp Ltd
PowerChina Huadong Engineering Shenzhen Corp Ltd
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PowerChina Huadong Engineering Corp Ltd
PowerChina Huadong Engineering Shenzhen Corp Ltd
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    • G06—COMPUTING; CALCULATING OR COUNTING
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    • G06F30/00—Computer-aided design [CAD]
    • G06F30/10—Geometric CAD
    • G06F30/18—Network design, e.g. design based on topological or interconnect aspects of utility systems, piping, heating ventilation air conditioning [HVAC] or cabling
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2111/00—Details relating to CAD techniques
    • G06F2111/02—CAD in a network environment, e.g. collaborative CAD or distributed simulation
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/08—Fluids
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F2113/00—Details relating to the application field
    • G06F2113/14—Pipes

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Abstract

The invention provides a quantitative evaluation method for the mixing of outside water in a town sewage pipe network based on stable isotopes, which comprises the following steps: s1, collecting pipe network basic data and mastering the flow direction of the pipe network; s2, distributing sampling points and monitoring flow, arranging sampling points and monitoring flow points in a pipe network area, and measuring the isotope content after filtering and preprocessing the sampled water sample; s3, establishing a calculation model, and establishing a water source segmentation calculation model according to the stable isotope detection and pipe network comprehensive sewage flow monitoring results; s4, quantitatively analyzing the mixing of the external water into the pipe network, calculating the mixing amount of the external water according to a water source segmentation model, and calculating and analyzing the proportion W of each external water type to the water amount in the pipe network according to water balancei(％)＝Qi/Qt. The method provided by the invention adopts the stable isotope to carry out tracing operation, is convenient and fast to operate, can effectively reduce repeated work, shorten the analysis period and reduce the time cost, and can effectively shorten the construction period and reduce the engineering cost by applying the method to the engineering.

Description

Quantitative evaluation method for external water mixing of urban sewage pipe network based on stable isotope
Technical Field
The invention relates to a quantitative evaluation method for the external water mixing of a town sewage pipe network, in particular to a quantitative evaluation method for the external water mixing of the town sewage pipe network based on stable isotopes.
Background
At present, most of the quantitative evaluation methods for the external water mixing of pipe networks in China are based on the traditional water quality and water quantity balance analysis or simple water quantity balance analysis, and the analysis method needs to synchronously install a pipeline flowmeter in a sewage pipe network and needs to uninterruptedly monitor the traditional water quality parameters for a long period. The current typical traditional water quality and water quantity analysis is mainly based on water quality parameters such as COD, BOD, ammonia nitrogen, pH, TN and the like, but the parameters are influenced by a sampling method, an analysis method, environment, on-way degradation, microorganisms, source water quality and the like, and the defects of small application range, high economic and personnel investment, high implementation difficulty, complicated analysis process, long analysis period, low calculation precision and the like exist or exist, so that the system can accurately and quantitatively evaluate the fact that external water is mixed into a sewage system to cause great obstruction.
Therefore, it is necessary to provide a quantitative evaluation method for the mixing of the outside water of the urban sewage pipe network.
Disclosure of Invention
The invention aims to: aiming at the defects in the prior art, the quantitative evaluation method for the mixing of the outside water of the urban sewage pipe network based on the stable isotope, which can monitor the running condition of the sewage system, has short analysis period, is easy to open and work and has high accuracy of analysis results, is provided.
Therefore, the above purpose of the invention is realized by the following technical scheme:
a quantitative evaluation method for the mixing of outside water in a town sewage pipe network based on stable isotopes comprises the following steps:
s1, collecting pipe network basic data and mastering the flow direction of the pipe network;
s2, distributing sampling points and monitoring flow, arranging sampling points and monitoring flow points in a pipe network area, and measuring the isotope content after filtering and preprocessing the sampled water sample;
s3, establishing a calculation model, and establishing a water source segmentation calculation model according to the stable isotope detection and pipe network comprehensive sewage flow monitoring result:
Qt＝Qw+…+Qi
δtQt＝δwQw+…+δiQi
wherein: qtFor pipe network comprehensive sewage flow, QwFor source sewage flow, QiClass i external water flow, delta, for entering the pipe networktIs the isotope value, delta, in the water of the pipe networkwIs the isotope value, delta, of the source sewage or the daily wateriBeing isotope of class i external waterThe prime value; when i types of external water exist, i stable isotopes are selected as tracers, and i +1 calculation equations are established;
s4, quantitatively analyzing the mixing of the external water into the pipe network, calculating the mixing amount of the external water according to a water source segmentation model, and calculating and analyzing the proportion W of each external water type to the water amount in the pipe network according to water balancei(％)＝Qi/Qt。
While adopting the technical scheme, the invention can also adopt or combine the following technical scheme:
as a preferred technical scheme of the invention: the stable isotope is the isotope of light elements such as hydrogen, oxygen, nitrogen, carbon and sulfur.
As a preferred technical scheme of the invention: the external water comprises underground water, precipitation, river and lake water and policy external water; the strategic external water is construction precipitation or foundation pit precipitation, swimming pool water change or maintenance drainage, landscape water body effluent, hot spring water drainage, low-concentration industrial wastewater, and market/park special integrated sewage treatment facility effluent; the low-concentration industrial wastewater is industrial wastewater with the water quality meeting the current standard of water pollution emission limit.
As a preferred technical scheme of the invention: in the step 2: the stationing monitoring includes monitoring of flow, isotope monitoring during periods of non-rainfall, and isotope monitoring during periods of rainfall.
As a preferred technical scheme of the invention: the stable isotope monitoring is divided into underground water, source sewage, comprehensive sewage, precipitation and other external water isotope monitoring in the rainfall period and underground water, source sewage, sewage in a pipe and other external water isotope monitoring in the non-rainfall period; the isotope of the source sewage is basically not influenced by human activities, so that the isotope can be replaced by the isotope of daily water; the comprehensive sewage consists of source sewage and external water.
The invention provides a quantitative evaluation method for the mixing of outside water in a town sewage pipe network based on stable isotopes, which has the following beneficial effects: the stable isotope is adopted for tracing operation, the operation is convenient and fast, the repeated work can be effectively reduced, the analysis period is shortened, the time cost is reduced, and the construction period and the engineering cost can be effectively shortened by applying the stable isotope to the engineering; secondly, the invention can accurately quantify different types of external water entering the sewage pipe network, deeply analyze the influence of external water such as precipitation, underground water and the like on the water quality and the water quantity of the urban sewage pipe network and the sewage treatment plant, pre-diagnose the possible problems of wrong mixed leakage connection, external water inflow, defects, underground water infiltration and the like of the pipe network, and provide technical support for the operation and the maintenance of the urban pipe network and the normal operation of the sewage treatment plant.
Drawings
Fig. 1 is a working flow chart of the quantitative evaluation method for the mixing of outside water in town sewage pipe network based on stable isotope provided by the present invention.
Detailed Description
The invention is described in further detail with reference to the figures and specific embodiments.
A quantitative evaluation method for underground water and precipitation mixing of urban sewage pipe networks based on stable hydrogen and oxygen isotopes comprises the following steps:
s1: collecting data. Respectively collecting the industrial water consumption and domestic water consumption in the pipe network zone, and obtaining the sewage water quantity Q in the zone after multiplying the corresponding sewage production coefficient based on the dataw；
S2: and (5) stationing, sampling and monitoring. Distributing sampling points at a source sewage discharge port, upstream and downstream positions of a pipe network and a branch pipe merging main pipe in a fragment area, distributing underground water and precipitation sampling points at the periphery of the pipe network, and performing sampling work in the fragment area according to the national water quality sampling industry standard; automatic flow monitoring points are distributed at the upstream and downstream positions of a pipe network in the district and at the position where branch pipes are converged into a main pipe.
Respectively collecting source sewage, comprehensive sewage and underground water in a plot during non-rainfall period; during rainfall, source sewage, comprehensive sewage, underground water and atmospheric precipitation in the plot are collected respectively.
After the samples are collected in two time periods, the samples are hermetically brought back to a laboratory, the water sample is filtered by a 0.22 mu m filter head and then is put into a 2mL sample feeding bottle, and the stable isotope content (hydrogen isotope D and oxygen isotope D) in the water sample is determined by adopting an ultrahigh precision water and water vapor isotope analyzer18The thousandth deviation value of O is based on VSMOW, the unit is thousandth, and the isotope ratio mass spectrometer is used for delta18The analysis precision of O and delta D is respectively 0.011 per mill and 0.038 per mill), and the content delta D of the hydrogen-oxygen isotope in the source sewage is obtainedSource sewageAnd delta18OSource sewageAnd the hydrogen-oxygen isotope content delta D of the comprehensive sewageComprehensive sewageAnd delta18OComprehensive sewageHydrogen-oxygen isotope content delta D of atmospheric precipitationAtmospheric precipitationAnd delta18OAtmospheric precipitationIsotopic content of groundwater delta DGround waterAnd delta18OGround water；
S3, establishing a calculation model, and establishing a three-water-source segmentation calculation model according to the stable hydrogen and oxygen isotope values of the monitored comprehensive sewage quantity, the comprehensive sewage, the source sewage (daily water), the underground water and the atmospheric precipitation;
Qt＝Qw+Qg+Qr
δDtQt＝δDwQw+δDgQg+δDrQr
δ18OtQt＝δ18OwQw+δ18OgQg+δ18OrQr
s4, quantitatively analyzing the mixing of the external water of the pipe network, and calculating the source sewage quantity Q entering the pipe network system according to the water source segmentation modelwGroundwater infiltration amount QgAnd the amount of precipitation mixed QrAnd calculating and analyzing the proportion W of the groundwater infiltration amount to the comprehensive water amount in the pipe network according to the water balanceg(％)＝Qg/QtThe proportion W of the mixed amount of the precipitation to the comprehensive water amount in the pipe networkr＝Qr/Qt。
The invention provides a quantitative evaluation method for the mixing of outside water in a town sewage pipe network based on stable isotopes, which has the following beneficial effects: the stable isotope is adopted for tracing operation, the operation is convenient and fast, the repeated work can be effectively reduced, the analysis period is shortened, the time cost is reduced, and the construction period and the engineering cost can be effectively shortened by applying the stable isotope to the engineering; secondly, the invention can accurately quantify different types of external water entering the sewage pipe network, deeply analyze the influence of external water such as precipitation, underground water and the like on the water quality and the water quantity of the urban sewage pipe network and the sewage treatment plant, pre-diagnose the possible problems of wrong mixed leakage connection, external water inflow, defects, underground water infiltration and the like of the pipe network, and provide technical support for the operation and the maintenance of the urban pipe network and the normal operation of the sewage treatment plant.
The above-described embodiments are intended to illustrate the present invention, but not to limit the present invention, and any modifications, equivalents, improvements, etc. made within the spirit of the present invention and the scope of the claims fall within the scope of the present invention.

Claims (5)

1. A quantitative evaluation method for the external water mixing of a town sewage pipe network based on stable isotopes is characterized by comprising the following steps: the method comprises the following steps:
s1, collecting pipe network basic data and mastering the flow direction of the pipe network;
s2, distributing sampling points and monitoring flow, arranging sampling points and monitoring flow points in a pipe network area, and measuring the isotope content after filtering and preprocessing the sampled water sample;
s3, establishing a calculation model, and establishing a water source segmentation calculation model according to the stable isotope detection and pipe network comprehensive sewage flow monitoring result:
Qt＝Qw+…+Qi
δtQt＝δwQw+…+δiQi
wherein: qtFor pipe network comprehensive sewage flow, QwFor source sewage flow, QiClass i external water flow, delta, for entering the pipe networktIs the isotope value, delta, in the water of the pipe networkwIs the isotope value, delta, of the source sewage or the daily wateriIs the isotope value of the i-th class of external water; when i types of external water exist, i stable isotopes are selected as tracers, and i +1 calculation equations are established;
s4, mixing the water outside the pipe network into a quantitative separatorAnalyzing, calculating the mixing amount of the external water according to the water source segmentation model, and calculating and analyzing the proportion W of each external water type to the water amount in the pipe network according to the water balancei(％)＝Qi/Qt。
2. The method for quantitatively evaluating the mixing-in of the outside water of the town sewer network based on the stable isotope as claimed in claim 1, wherein: the stable isotope is the isotope of light elements such as hydrogen, oxygen, nitrogen, carbon and sulfur.
3. The method for quantitatively evaluating the mixing-in of the outside water of the town sewer network based on the stable isotope as claimed in claim 1, wherein: the external water comprises underground water, precipitation, river and lake water and policy external water; the strategic external water is construction precipitation or foundation pit precipitation, swimming pool water change or maintenance drainage, landscape water body effluent, hot spring water drainage, low-concentration industrial wastewater, and market/park special integrated sewage treatment facility effluent; the low-concentration industrial wastewater is industrial wastewater with the water quality meeting the current standard of water pollution emission limit.
4. The method for quantitatively evaluating the mixing-in of the outside water of the town sewer network based on the stable isotope as claimed in claim 1, wherein: in the step 2: the stationing monitoring includes monitoring of flow, isotope monitoring during periods of non-rainfall, and isotope monitoring during periods of rainfall.
5. The method for quantitatively evaluating the mixing-in of the outside water of the town sewer network based on the stable isotope as claimed in claim 4, wherein: the stable isotope monitoring is divided into underground water, source sewage, comprehensive sewage, precipitation and other external water isotope monitoring in the rainfall period and underground water, source sewage, sewage in a pipe and other external water isotope monitoring in the non-rainfall period; the isotope of the source sewage is basically not influenced by human activities, so that the isotope can be replaced by the isotope of daily water; the comprehensive sewage consists of source sewage and external water.
CN202110799280.7A 2021-07-15 2021-07-15 Quantitative evaluation method for external water mixing of urban sewage pipe network based on stable isotope Pending CN113704932A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114624407A (en) * 2022-02-24 2022-06-14 南宁市勘测设计院集团有限公司 Typical plot based outside water volume measuring and calculating method for plot sewage system
CN115577506A (en) * 2022-09-22 2023-01-06 长江生态环保集团有限公司 Method for pre-diagnosing and accurately troubleshooting problems of sewage pipe network

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CN111783027A (en) * 2020-06-16 2020-10-16 湖北省水利水电规划勘测设计院 Method for calculating replenishment rate of rainfall and underground water to surface water by utilizing isotopes
CN113111478A (en) * 2021-05-13 2021-07-13 北控水务(中国)投资有限公司 Method and equipment for evaluating mixed connection, inflow and infiltration degree of drainage system pipe network

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CN111783027A (en) * 2020-06-16 2020-10-16 湖北省水利水电规划勘测设计院 Method for calculating replenishment rate of rainfall and underground water to surface water by utilizing isotopes
CN113111478A (en) * 2021-05-13 2021-07-13 北控水务(中国)投资有限公司 Method and equipment for evaluating mixed connection, inflow and infiltration degree of drainage system pipe network

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN114624407A (en) * 2022-02-24 2022-06-14 南宁市勘测设计院集团有限公司 Typical plot based outside water volume measuring and calculating method for plot sewage system
CN114624407B (en) * 2022-02-24 2024-05-10 南宁市勘测设计院集团有限公司 Method for measuring and calculating external water quantity of district sewage system based on typical land parcels
CN115577506A (en) * 2022-09-22 2023-01-06 长江生态环保集团有限公司 Method for pre-diagnosing and accurately troubleshooting problems of sewage pipe network
CN115577506B (en) * 2022-09-22 2023-08-25 长江生态环保集团有限公司 Method for pre-diagnosing and accurately checking problems of sewage pipe network

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