CN114202441B - Method for determining underground water infiltration amount in sewage pipe network in monitoring area - Google Patents
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 71
- 230000008595 infiltration Effects 0.000 title claims abstract description 58
- 238000001764 infiltration Methods 0.000 title claims abstract description 58
- 238000012544 monitoring process Methods 0.000 title claims abstract description 57
- 239000010865 sewage Substances 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims abstract description 34
- 239000003673 groundwater Substances 0.000 claims abstract description 34
- 235000020188 drinking water Nutrition 0.000 claims description 25
- 239000003651 drinking water Substances 0.000 claims description 25
- 229910052739 hydrogen Inorganic materials 0.000 claims description 12
- 229910052760 oxygen Inorganic materials 0.000 claims description 11
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 10
- 239000001257 hydrogen Substances 0.000 claims description 10
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Abstract
The invention discloses a method for determining the groundwater infiltration amount in a sewage pipe network in a monitored area, which comprises the following steps: drinking in monitored areaIn water 2 H& 18 Isotope number of O D 1 ‰&D 2 Thousandths of the total mass and its uncertainty d 1 ％&d 2 Percent; taking underground water in monitored area 2 H& 18 Isotope number of O G 1 ‰&G 2 Thousandths of the total mass and its uncertainty g 1 ％&g 2 Percent; selecting a pipe network tail end node number as x, installing a flowmeter at the x position for flow monitoring, collecting a sewage sample, and measuring the pipe network tail end daily flow as Q and the isotope value of two elements in sewage as W 1 ‰&W 2 Thousandths and its instrument uncertainty w 1 ％&w 2 %; calculating the groundwater infiltration quantity Q in the sewage pipe network in the monitoring area g . The invention can quickly and accurately determine the groundwater infiltration amount in the sewage pipe network in the monitoring area.
Description
Technical Field
The invention relates to the field of sewage treatment, in particular to an assessment method for the overall situation of groundwater infiltration in a regional pipe network.
Background
Along with the acceleration of the urbanization process of China, the urban scale is rapidly enlarged, and the amount of generated sewage is also rapidly increased. The municipal sewage system, which is an important component of the municipal infrastructure, assumes the functions of sewage collection and transport. The environment of urban production and living is directly influenced by the operating state. In recent years, the water quality of inlet water of sewage treatment plants in China is low, and the situation that the water inlet quantity is far more than the designed water quantity frequently occurs. Investigation shows that groundwater infiltration in a pipe network is the main reason for low influent sewage concentration and increased water inflow. The infiltration of the underground water in the pipe network not only increases the operating cost of the sewage treatment plant, but also reduces the treatment efficiency; and the sewage treatment device also occupies the space in the pipe network and influences the sewage conveying efficiency. The damaged pipe network can also aggravate the loss of underground water, and can cause the occurrence of road surface collapse accidents in severe cases. Therefore, a reliable method system is needed to be established for accurate evaluation and analysis of groundwater in a sewer network.
At present, the method for analyzing groundwater infiltration in a sewage pipe network can be mainly divided into a flow balance method and a material flux balance method according to the principle. The flow balance method is the earliest applied infiltration evaluation method, and is based on the flow balance principle. Among them, the nighttime flow method is the most representative, and many research examples are available at home and abroad. However, when the service range of the sewage system is large, the hydraulic time in the pipeline can be prolonged, the peak valley of the minimum flow at night is not obvious, and a large error exists. Therefore, in recent years, analysis methods based on material flux balance have been developed, such as quantitative analysis of groundwater in a sewer network by using a stable isotope method, a pollutant time series method and a water quality characteristic factor method. The stable isotope method distinguishes the underground water and the domestic sewage in a pipe network based on the difference of water sources of drinking water and the underground water; the pollutant time sequence method establishes a water quality and water quantity balance equation by continuously measuring the pollutant concentration and flow in a pipe network, and fits the underground water quantity and the domestic sewage concentration in the sewage to finally obtain the infiltration quantity. The water quality factor method is to select water quality characteristic factors which can represent domestic sewage and underground water, and solve the infiltration amount of the underground water in a pipe network by establishing a water quality and water quantity balance relation. Wherein, the stable isotope method has been successfully applied for several times abroad, and an application system of the method is not established at home.
Disclosure of Invention
The invention aims to establish a set of stable isotope method system in domestic application environment, provide an analysis method for accurately quantifying the infiltration amount of underground water in a pipe network and find the infiltration rule of the underground water in the pipe network. The method is characterized in that isotopes of two elements in water are used as monitoring objects, and the infiltration amount of underground water in the sewage pipe network is analyzed by monitoring the isotope thousands of values of drinking water, underground water, domestic sewage and a pipe network tail end inspection well and detecting the flow of the pipe network tail end. It should be noted that the method is applied under the conditions that (1) the monitoring area supplies water to a single water source, and the water supply source and the underground water have isotope difference (remote water supply or pressure bearing layer water supply); (2) there is no industrial industry in the monitoring area, and the sewage pipe network only contains domestic sewage and underground water.
The purpose of the invention is realized by the following technical scheme.
The invention discloses a method for analyzing the groundwater infiltration capacity in a sewage pipe network, which comprises the following steps:
step one, obtaining drinking water in a plurality of monitoring areas, and carrying out isotope thousandth value detection on monitoring elements in the drinking water to obtain average isotope thousands values of two elements in the drinking water in the monitoring area, wherein the average isotope thousands values of the two elements are respectively D 1 Thousandths and D 2 Thousandths of the material and its measurement-related effectsUncertainty is d respectively 1 % and d 2 ％；
Step two, obtaining underground water in the service area of the sewage pipe network in a plurality of monitoring areas, and carrying out isotope thousandth value detection on monitoring elements in the underground water to obtain the average isotope thousandth values of two elements in the underground water in the monitoring area, wherein the average isotope thousandth values are respectively G 1 Thousandths and G 2 Permillage and uncertainty g caused by groundwater space variability 1 % and g 2 ％；
Marking the inspection well at the tail end of the pipe network of the monitoring area, and naming the marking as x;
step four, installing a flowmeter at the position x, and setting the flow rate at a value of 0:00-05: taking a water sample once per hour in the 00 period through an automatic sampler;
step five, measuring the flow of the tail end of the pipe network at the position x as Q, and measuring the isotope kilo values of two elements in the sample as W respectively 1 (t)% and W 2 (t)% o, its respective instrumental uncertainty being w 1 % and w 2 ％；
Sixthly, expressing the isotope values of the two elements in the sample in a coordinate system with the element 1 as a horizontal axis and the element 2 as a vertical axis, expressing the isotope values of the groundwater, the drinking water and the water at the end of the pipe network in the coordinate system, connecting the isotope average value point of the groundwater with the isotope average value point of the drinking water, and analyzing in a mixed line graph mode;
seventhly, calculating the daily infiltration quantity Q of the underground water in the pipe network of the monitoring area according to the following formulas (1) to (6) g Infiltration rate b and uncertainty of infiltration rate Δ b:
and step eight, judging the accuracy of the calculation result of the infiltration rate b by using the uncertainty delta b of the infiltration rate according to the result of the step seven. When b/delta b is more than 2, the result can be considered to be credible, and the smaller delta b is, the higher the infiltration result reliability is; if b/delta b is not satisfied and is larger than 2, large errors possibly exist in the situation of groundwater infiltration in the pipe network of the monitoring area estimated by the isotope method;
i＝1，2；------------------------------------------------------(3)
Q g ＝b×Q----------------------------------------------------(6)
the monitoring elements are hydrogen and oxygen (H) in water respectively 2 O，H&O) having the respective isotope 2 H and 18 O。
the monitored flow is daily flow, and the evaluation result is described according to daily infiltration.
The area to be monitored only comprises a single geological structure, a groundwater shallow aquifer is uniformly distributed, and a drinking water supply source is single; meanwhile, enterprises (industries) with the property of production activities are not contained in the monitoring area.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention adopts the isotope of the hydrogen and oxygen elements in the water as the monitoring index for analyzing the groundwater infiltration, compared with the traditional water quality characteristic factor, the stable isotope in the groundwater and the sewage has more stability, can not be influenced by the sedimentation effect and the biological adsorption in the water, and can represent the characteristics of different water sources.
(2) The present invention adds an evaluation criterion for the infiltration result. In the traditional method, the accuracy of the infiltration result evaluation is not unified, and the estimation of the accuracy degree can only depend on the principle of the method. The stable isotope law has self judgment standard, and by analyzing the uncertainty of the infiltration result, the accuracy and the credibility of the infiltration metering result are evaluated in an intuitive mode.
(3) When the invention is used for analyzing the groundwater infiltration capacity in the sewage pipe network, the monitoring area can be divided into a plurality of tail ends for monitoring, and after the stable isotope values of the groundwater and the drinking water in the monitoring area and the respective uncertainty thereof are obtained, the sewage pipe network service range with larger groundwater infiltration capacity (infiltration rate) is determined by combining the flow and the isotope value of each tail end, so as to reduce the monitoring range. The accurate finding of the key infiltration area is a necessary prerequisite for finding the problematic pipe section.
(4) The method is efficient and simple, simple to operate and high in accuracy, and can be applied to the total groundwater infiltration analysis in the sewage pipe network. On the premise of meeting the market demand, a foundation basis is provided for the remediation scheme of the sewage system or the positioning of the damaged pipe sections in the pipe network.
Drawings
The invention is further explained by combining the attached drawings
FIG. 1 is a schematic diagram of the principle of the present invention
FIG. 2 is a schematic diagram of a pipe network and monitoring points
FIG. 3 is a schematic view of an isotope mixing line
Detailed Description
After the drinking water is changed into domestic sewage after being used, the change degree of the isotope value of the domestic sewage is smaller and is generally within the measurement error range, so that the isotope value of the domestic sewage (without underground water) is considered to be the same as that of the drinking water. When the pipe network does not contain underground water, the isotope value of the water at the tail end of the pipe network is equal to the value of drinking water. Groundwater in shallow aquifers is usually replenished by local streams of rivers, lakes and rainfall, and therefore the isotopic composition of groundwater is generally stable and has a significantly different isotopic value than drinking water from remote water supplies. The flow and isotope value at the tail end of the sewage pipe network are monitored simultaneously in a dry day, and the groundwater infiltration amount in the pipe network can be quantified by combining the monitoring result of the drinking water and groundwater isotope value. The invention is further described below with reference to the accompanying drawings.
The invention relates to a sewage pipe network groundwater infiltration analysis and evaluation method, which comprises the following steps:
step one, determining that water is supplied for a single water source and a non-local water source in a monitoring area, and meanwhile, the geological condition is single. The monitoring area can also be divided into several small areas to meet the above conditions. Obtaining drinking water in several monitoring areas, numbering the samples, and comparing (H) in the samples 2 O in H, O) 2 H& 18 Detecting isotope thousandth value of O to obtain drinking water in the monitoring area range 2 H& 18 The average isotope kilo-score of O is D 1 Thousandths and D 2 Permillage and uncertainty thereof are d 1 % and d 2 ％；
Step two, obtaining underground water in the service area of the sewage pipe network in a plurality of monitoring areas, numbering samples and counting the number of the underground water 2 H& 18 Detecting isotope thousandth value of O to obtain underground water in the monitoring area range 2 H& 18 The average isotope kilo-score of O is G 1 Thousandths and G 2 Thousandths, and its uncertainty g 1 % and g 2 ％；
Marking the inspection well at the tail end of the pipe network of the monitoring area, and naming the marking as x;
step four, installing a flowmeter at the position x, and setting the flow rate at a value of 0:00-05: taking a water sample once per hour in a 00-time period through an automatic sampler;
step five, measuring the flow of the tail end of the pipe network at the position x as Q, and measuring the flow in the sample 2 H& 18 The isotope number of O is W 1 (t)% and W 2 (t)% and its respective instrumental uncertainty of w 1 % and w 2 ％；
Sixthly, indicating the isotope values of the two elements in the sample in a coordinate system with the element 1 as a horizontal axis and the element 2 as a vertical axis, indicating the isotope values of the groundwater, the drinking water and the water at the tail end of the pipe network in the coordinate system, connecting the isotope average value point of the groundwater with the isotope average value point of the drinking water, and making an isotope mixing line graph as shown in fig. 3;
in the seventh step,calculating the daily infiltration Q of the underground water in the pipe network of the monitoring area according to the formulas (1) to (6) g Infiltration rate b and uncertainty of infiltration rate Δ b:
and step eight, judging the accuracy of the calculation result of the infiltration rate b by using the uncertainty delta b of the infiltration rate according to the result of the step seven. When b/delta b is more than 2, the result can be considered to be credible, and the smaller delta b is, the higher the infiltration result reliability is; if b/delta b is not satisfied and is larger than 2, large errors possibly exist in the situation of groundwater infiltration in the pipe network of the monitoring area estimated by the isotope method;
i＝1，2；---------------------------------------------(3)
Q g ＝b×Q--------------------------------------------(6)
example (b):
this embodiment is through isotope and the flow monitoring to a monitoring area, obtains the groundwater infiltration volume computational result in this monitoring area sewage pipe network and the precision analysis of result. Compared with the prior art, the underground water volume error in the pipe network quantified by the method is small, and the method has high reliability when applied to actual engineering.
The positions of a pipe network terminal monitoring point S, underground water monitoring points A1, A2, A3 and A4 and tap water monitoring points B1, B2, B3 and B4 in the area are shown in figure 2, and the schematic diagram of an isotope mixing line is shown in figure 3. Isotope values and pipe network end monitoring flow values at each monitoring point are shown in table 1.
TABLE 1
According to the monitoring result, the average values of the hydrogen and oxygen isotopes of the underground water sample are-57.4 per thousand and-6.86 per thousand respectively, and the uncertainty of each hydrogen and oxygen isotope is 1.48 and 0.25 respectively; the average value of hydrogen and oxygen isotopes of the drinking water sample is-63 per thousand and-8.5 per thousand respectively, and the uncertainty of the hydrogen and oxygen isotopes is 0.44 and 0.15 respectively; the hydrogen and oxygen isotope values of the samples at the tail ends of the official meshes are-61.4 per mill and-8.06 per mill respectively, and the corresponding uncertainties are 0.26 and 0.08. Substituting the above parameters into equations (1) - (6), and calculating the infiltration rate b from hydrogen isotope 1 Is 0.29, and has an uncertainty Δ b 1 Is 0.11; the infiltration rate calculated from the oxygen isotope was 0.27 with an uncertainty Δ b 2 0.09, mean infiltration b 0.28, uncertainty Δ b 2 The value is 0.1, the results all satisfy b/delta b >2, and the infiltration rates obtained by isotope calculation have higher reliability. The average daily flow Q obtained by combining the flowmeter and monitoring at the tail end of the pipe network is 1543.6m 3 D, the average daily infiltration obtained is 432.208 m3 /d。
Although the specific functions and embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the functions and operations described above, and the above embodiments are only illustrative and not restrictive. Those skilled in the art should appreciate that they can make various changes, substitutions and alterations herein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (3)
1. A method for determining the groundwater infiltration amount in a sewage pipe network in a monitored area is characterized by comprising the following steps:
step one, obtaining drinking water in a plurality of monitoring areas, and carrying out isotope thousandth value detection on monitoring elements in the drinking water, wherein the monitoring elements are hydrogen and oxygen in the water respectively, and the isotopes are hydrogen and oxygen respectively 2 H and 18 o, detecting to obtain the average isotope thousands values of two elements in the drinking water in the monitoring area as D1 per thousand and D2 per thousand respectively, and the uncertainty caused by a measuring instrument is D1 percent and D2 percent respectively;
step two, acquiring underground water in the service area of the sewage pipe network in a plurality of monitoring areas, and carrying out isotope thousandth value detection on monitoring elements in the underground water to obtain average isotope thousandth values of two elements in the underground water in the monitoring area, namely G1 thousandth and G2 thousandth respectively, and uncertainty G1% and G2% caused by underground water space variability;
marking the inspection well at the tail end of the pipe network of the monitoring area, and naming the marking as x;
step four, installing a flow meter at the position x, and taking a water sample once per hour through an automatic sampler in a period of 0-00;
step five, measuring the flow of the tail end of the pipe network at the position x as Q, measuring isotope thousands of values of two elements in the sample as W1 (t)% and W2 (t)% respectively, and measuring uncertainty of respective instruments as W1% and W2%;
sixthly, indicating the isotope values of the two elements in the sample in a coordinate system with the element 1 as a horizontal axis and the element 2 as a vertical axis, indicating the isotope values of the groundwater, the drinking water and the water at the tail end of the pipe network in the coordinate system, connecting the isotope average value point of the groundwater with the isotope average value point of the drinking water to form an isotope mixing line graph, and analyzing in a mixing line graph mode;
step seven, calculating the daily infiltration capacity Q of the underground water in the pipe network of the monitoring area according to the formulas (1) - (6) g Infiltration rate b and uncertainty of infiltration rate Δ b:
step eight, according to the result of the step seven, the accuracy of the calculation result of the infiltration rate b is judged by using the uncertainty delta b of the infiltration rate, when the b/delta b is more than 2, the result is considered to be credible, and the smaller delta b is, the higher the reliability of the infiltration result is; if the b/delta b is not more than 2, evaluating that a larger error exists in the groundwater infiltration condition in the pipe network of the monitoring area by using an isotope method;
2. the method of claim 1, wherein the monitored flow rate is a daily flow rate and the evaluation result is described in terms of daily infiltration.
3. The method of claim 1, wherein the area to be monitored comprises only a single geological structure, shallow aquifers of the groundwater are uniformly distributed, and the drinking water supply source is single; meanwhile, industrial enterprises with the property of production activity are not contained in the monitoring area.
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