CN114216062A - Method for determining infiltration position and infiltration amount of underground water in sewage pipeline - Google Patents
Method for determining infiltration position and infiltration amount of underground water in sewage pipeline Download PDFInfo
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- CN114216062A CN114216062A CN202111538170.1A CN202111538170A CN114216062A CN 114216062 A CN114216062 A CN 114216062A CN 202111538170 A CN202111538170 A CN 202111538170A CN 114216062 A CN114216062 A CN 114216062A
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- pipe section
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/10—Arrangements for supervising or controlling working operations for taking out the product in the line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D3/00—Arrangements for supervising or controlling working operations
- F17D3/12—Arrangements for supervising or controlling working operations for injecting a composition into the line
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17D—PIPE-LINE SYSTEMS; PIPE-LINES
- F17D5/00—Protection or supervision of installations
- F17D5/02—Preventing, monitoring, or locating loss
- F17D5/06—Preventing, monitoring, or locating loss using electric or acoustic means
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Acoustics & Sound (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
The invention discloses a method for determining and monitoring the groundwater infiltration amount in a sewage pipe section, which comprises the following steps: selecting a sewage monitoring pipe section, wherein the upstream of the pipe section is a monitoring point A, and the downstream of the pipe section is a monitoring point B; a flowmeter and an automatic feeder are arranged at an upstream monitoring point A, and an automatic sampler is arranged at a downstream monitoring point B. Configuration C0The lithium chloride solution of mg/L is put into an upstream monitoring point A by an automatic feeder at the speed of q0 mL/min; continuously sampling at a downstream monitoring point B to obtain a concentration CB‑1、CB‑2……CB‑6mg/l of sample; according to the flow Q of the monitoring sewage pipe section0And B, calculating the infiltration amount of underground waterAnd Q. The invention can quickly and accurately determine the groundwater infiltration amount in the monitoring sewage pipe section.
Description
Technical Field
The invention is used in the field of sewage treatment, and particularly relates to a method for determining the infiltration position and the infiltration amount of underground water in a sewage pipeline.
Background
The infiltration of groundwater in drainage pipe networks has become a major problem in the operation of pipe networks and sewage plants. Groundwater infiltration can increase the drainage flow in the pipe network, and the operating cost of pump stations and sewage treatment plants is increased. The redundant underground water can dilute the concentration load of the water inlet pollutants of the sewage plant, and the treatment efficiency of the sewage plant is reduced. Underground water occupies space in the pipe and influences flood season drainage. Serious groundwater infiltration may cause overflow of the pipeline, causing untreated sewage to enter the water body to pollute the environment. Groundwater infiltration in pipelines presents a serious challenge to social production and the ecological environment.
At present, methods for evaluating the groundwater infiltration amount in a pipe network in an area are mature, but the methods for positioning damaged pipe sections in the pipe network and groundwater infiltration positions are developed less frequently, and the current common methods include a node monitoring method and a pipeline closed circuit television detection method (CCTV). The node monitoring method is based on the principle of water quality and water quantity balance, a pipe network is divided into a plurality of sections, and pipe sections with large concentration and flow change are found out according to the water quality and water quantity monitoring results. The method takes conventional pollutants as water quality monitoring objects, and is easily interfered by the water environment to cause measurement errors; when the CCTV is used for detecting the pipeline, the condition in the pipeline can be visually checked, but each visual inspection needs a series of complicated steps of dredging, water transfer and the like on the pipeline, so that the time and the labor are wasted, and the capability of quantifying the infiltration of underground water is not realized.
Disclosure of Invention
In order to solve the problems of the prior art, the method for analyzing the groundwater infiltration capacity of the sewage pipe network based on the water quality and water quantity balance method is provided, stable metal ion Li is adopted as a water quality characteristic factor, when the sewage flow in a pipe section is stable, lithium chloride tracer is continuously put in the monitored sewage pipe section, and the position of groundwater infiltration due to damage of the sewage pipe section and the groundwater infiltration capacity in the pipe section are confirmed by the change of Li concentration of an upstream monitoring point and a downstream monitoring point and the combination of pipe section flow measurement.
A method for determining the infiltration position and the infiltration amount of underground water in a sewage pipeline comprises the following steps:
selecting a monitoring pipe section in a sewage pipe network, selecting a monitoring point A at the upstream of the monitoring pipe section and selecting a monitoring point B at the downstream of the monitoring pipe section;
step two, preparing the lithium chloride tracer solution with the concentration of C0g/L. The appropriate anhydrous ammonium chloride is weighed, added with distilled water and dissolved in a 250mL beaker, and then distilled water is added to reach the constant volume of 1000 mL. Configuring for 4 times to obtain 4L of C0g/L lithium chloride solution.
Step three, feeding and setting, namely, a peristaltic pumpFlow rate is adjusted to q0mL/min, pumping the lithium chloride solution into an upstream monitoring point A through a conduit; and (3) sampling, namely collecting sewage samples by using an automatic sampler at a downstream monitoring point B, continuously sampling (mixing samples) according to a time proportion, setting that each sample of the sampler is continuously collected for 10min, completing sample collection once every 10min, and collecting 6 water samples in total. The sampling starting time is later than the feeding time, the time difference is obtained according to the upstream measured sewage flow rate and the distance between A, B points, the sampling duration lasts for 1h, and the feeding duration is more than 1 h.
Step four, installing a flowmeter and an automatic feeder at an upstream monitoring point A, and carrying out continuous flow measurement and lithium chloride stock solution feeding; and installing an automatic sampler at a downstream monitoring point B for sample collection.
And step five, obtaining the stable time period of the sewage flow in the pipe section according to a continuous monitoring curve of the daily flow of the sewage in the pipe. The hourly flow Q at A is obtained through flow monitoring0m3H; and after the upstream monitoring point starts feeding, the downstream monitoring point continues sampling for 1 h. Obtaining C at a downstream monitoring point BB-1、 CB-2…··CB-6mg/l of the mixture.
Sixthly, calculating the groundwater infiltration amount Qm in the experimental period of the monitoring section according to the following formula3/h：
Compared with the prior art, the technical scheme of the invention has the beneficial effects that:
(1) the flow monitoring and the water quality sampling are carried out synchronously, and the flow measurement time interval is a sewage flow stabilization period so as to reduce the measurement error caused by flow fluctuation.
(2) The invention adopts Li ions as characteristic factors of water quality. The Li ions do not exist in the sewage and the underground water or the background concentration value of the Li ions is very small, so the Li ions have strong discreteness in a sewage pipeline and have higher identification degree, and meanwhile, the concentration change of the Li ions is not influenced by microorganisms and deposition in the water and has higher stability.
(3) The present invention employs time-proportional continuous sampling. Compared with the instantaneous sample, the mixed sample has no error caused by the randomness of water quality change and can represent the average water quality in a period of time.
(4) The method is efficient and simple, is simple to operate, has small error, can be used for positioning the damaged pipe section in the sewage pipe network, and can accurately quantify the underground water infiltration amount in the pipe network. After the overall evaluation of the underground water infiltration condition in the pipe network, a plurality of pipe sections are divided for the gravity area, the positions of the damaged pipe sections are positioned according to upstream and downstream monitoring, and then relevant pipeline repairing measures are taken, so that the operation efficiency of the sewage pipe network is improved.
Drawings
FIG. 1 is a schematic diagram of the principles of the present invention;
fig. 2 is a schematic view of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The method for determining the infiltration position and the infiltration amount of the underground water in the sewage pipeline comprises the following steps of:
selecting a detection pipe section in a sewage pipe network, selecting a monitoring point A at the upstream of the monitoring pipe section and selecting a monitoring point B at the downstream of the monitoring pipe section;
step two, preparing the lithium chloride tracer solution with the concentration of C0mg/L. The appropriate anhydrous ammonium chloride is weighed, added with distilled water and dissolved in a 250mL beaker, and then distilled water is added to reach the constant volume of 1000 mL. Configuring for 4 times to obtain 4L of C0g/L lithium chloride solution.
Step three, feeding setting, namely adjusting the flow of the peristaltic pump to q0mL/min, pumping the lithium chloride solution into an upstream monitoring point A through a conduit; and (3) sampling, namely collecting sewage samples by using an automatic sampler at a downstream monitoring point B, continuously sampling (mixing samples) according to a time proportion, setting that each sample of the sampler is continuously collected for 10min, completing sample collection once every 10min, and collecting 6 water samples in total. The sampling starting time is later than the feeding time, and the sewage flow rate is measured according to the upstream and is between A, B pointsAnd obtaining the time difference according to the distance, wherein the sampling time lasts for 1h, and the feeding time is more than 1 h.
Step four, installing a flowmeter and an automatic feeder at an upstream monitoring point A, and carrying out continuous flow measurement and lithium chloride stock solution feeding; and installing an automatic sampler at a downstream monitoring point B for sample collection.
And step five, obtaining the stable time period of the sewage flow in the pipe section according to a continuous monitoring curve of the daily flow of the sewage in the pipe. The hourly flow Q is obtained through flow monitoring0m3H; according to the upstream flow and the lithium chloride feeding concentration; and after the upstream monitoring point starts feeding, the downstream monitoring point continues sampling for 1 h. Obtaining C at a downstream monitoring point BB-1、CB-2·…··CB-6mg/l, as shown in FIG. 1.
Sixthly, calculating the groundwater infiltration amount Qm in the experimental period of the monitoring section according to the following formula3/h：
Example (b):
this embodiment is through throwing material, sample and flow monitoring to the pipeline section that contains 4 inspection shafts of going up the low reaches, through behind flow measurement data and the analysis of water quality concentration change, obtains groundwater infiltration volume in this pipeline section.
The method is adopted for determining the groundwater infiltration amount of a certain pipe section in the sewage pipe network in the Jizhou area. In the embodiment shown in fig. 2, monitoring points a and B are the upstream feeding point and the downstream sampling point of the monitoring pipe section, respectively. A flowmeter and a feeder are arranged at the monitoring point A, the flowmeter carries out continuous flow monitoring, and the feeder monitors the concentration to be 9.21 multiplied by 103And continuously feeding mg/L lithium chloride into the sewage pipeline, wherein the feeding speed is set to be 42.19mL/min, and the feeding time is 1 h. And (3) installing an automatic sampler at the monitoring point B, continuously taking water for 10min each time, taking a sample every 10min, taking 500mL each time, taking 6 samples in total, and keeping the sampling time for 1 h. The monitoring result shows that the flow at the monitoring point A is 32.72m3H; 6 time periods at monitoring point BThe concentrations of the lithium chloride samples are respectively 0.6, 0.46, 0.52, 0.45, 0.5 and 0.61 mg/l; through the data analysis, the data is substituted into the formula to obtain the groundwater infiltration flow Q of the pipe section as 12.48m3/h；
The present invention is not limited to the specific functions and operations described above, the above embodiments are illustrative rather than limiting, and those skilled in the art can make various forms without departing from the spirit and scope of the present invention as defined by the appended claims.
Claims (4)
1. A method for determining the infiltration position and the infiltration amount of underground water in a sewage pipeline is characterized by comprising the following steps:
selecting a detection pipe section in a sewage pipe network, selecting a monitoring point A at the upstream of the monitoring pipe section and selecting a monitoring point B at the downstream of the monitoring pipe section;
and step two, preparing the lithium chloride tracer solution, wherein the concentration of the solution is C0 g/L. The appropriate anhydrous ammonium chloride is weighed, added with distilled water and dissolved in a 250mL beaker, and then distilled water is added to reach the constant volume of 1000 mL. The preparation was carried out 4 times to obtain 4L of a C0g/L lithium chloride solution.
Step three, feeding, adjusting the flow of a peristaltic pump to q0mL/min, and pumping the lithium chloride solution to an upstream monitoring point A through a conduit; and (3) sampling, namely collecting sewage samples by using an automatic sampler at a downstream monitoring point B, continuously sampling (mixing samples) according to a time proportion, setting that each sample of the sampler is continuously collected for 10min, completing sample collection once every 10min, and collecting 6 water samples in total. The sampling starting time is later than the feeding time, the time difference is obtained according to the upstream measured sewage flow rate and the distance between A, B points, the sampling duration lasts for 1h, and the feeding duration is more than 1 h.
Step four, installing a flowmeter and an automatic feeder at an upstream monitoring point A, and carrying out continuous flow measurement and lithium chloride stock solution feeding; and installing an automatic sampler at a downstream monitoring point B for sample collection.
And step five, obtaining the stable time period of the sewage flow in the pipe section according to a continuous monitoring curve of the daily flow of the sewage in the pipe. Obtaining the hour flow Q0m3/h at A position by flow monitoring; and after the upstream monitoring point starts feeding, the downstream monitoring point continues sampling for 1 h. A mixed sample of CB-1, CB-2 … … CB-6mg/l was obtained at the downstream monitoring point B.
Step six, calculating the groundwater infiltration amount Qm3/h in the experimental period of the monitoring section according to the following formula:
2. the analytical method for monitoring groundwater infiltration capacity in a sewage pipe section according to claim 1, wherein the monitoring element is Li in lithium chloride+。
3. The analysis method for monitoring groundwater infiltration capacity in a sewage pipe section according to claim 1, wherein the sewage pipe section is only accessed by an upstream node and a downstream node, and no other node is accessed.
4. The analysis method for monitoring the groundwater infiltration capacity in the sewage pipe section according to claim 1, wherein the monitored flow is a time flow of a period with small fluctuation of sewage flow, and the obtained evaluation result is described according to the time infiltration capacity.
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Cited By (1)
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| CN115012501A (en) * | 2022-06-09 | 2022-09-06 | 长江生态环保集团有限公司 | Detection system and method for defects of drainage pipe network |
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