Sedimentation simulation system and accounting method for sewage pollutants with different pipe diameters

Abstract

The invention discloses a different-pipe-diameter sewage pollutant deposition simulation system and an accounting method. The system comprises a cuboid tank body and a peristaltic pump, the cuboid tank body comprises a water inlet tank, a pipeline circulating tank, a water outlet tank and a cover plate; a water inlet is formed in the upper end of the corrugated hose, a water outlet is formed in the lower end of the corrugated hose, a flow velocity meter is mounted along the way, and a sampling opening is formed; the water inlet pool is connected with a corrugated hose water inlet; a corrugated hose water outlet is connected with the water outlet tank; a peristaltic pump is arranged on the cover plate. According to the accounting method, water in the water outlet pool is pumped back to the water inlet pool for circulation; the corrugated hose sewage is gravity flow; the flow velocity of sewage in the corrugated hose is controlled by coupling and adjusting the water level of the water inlet tank and the gradient of the corrugated hose; the pipe diameter of the corrugated hose can be changed, so that the response relation between the flow velocity and pollutant deposition attenuation in sewage pipelines with different pipe diameters is obtained.

Description

Technical Field

[0001] The present invention relates to the field of ecological environment protection, and in particular to a sewage pollutant deposition simulation system with different pipe diameters and a calculation method. Background Art

[0002] Domestic sewage pollutants settle in the pipe network to form a sediment layer. The formation rate and severity of the sediment layer are closely related to the sewage flow rate and liquid level. At present, sewage pipe networks in most parts of my country have problems with high liquid level and low flow rate. During the sewage transmission process, a large amount of particulate pollutants are deposited at the bottom of the pipe, resulting in excessive attenuation of organic matter concentration and low influent concentration of sewage treatment plants. At the same time, a large amount of sediment in the combined sewer network is easily entrained and washed into urban water bodies on rainy days, causing combined sewer overflow pollution and endangering the water environment.

[0003] The two most common methods for studying pipeline sediments are to investigate the sedimentation of actual sewage pipe networks and to build sewage pipe flow reactors at a certain ratio. The former is affected by the complex conditions in the design and operation of actual sewage pipes, and the relationship between the two key indicators of sewage flow rate and liquid level and the thickness of the formed sediment cannot be quantitatively evaluated; the latter is often affected by factors such as the experimental site, environmental conditions, and the single experimental pipe diameter, and cannot be close to the operating status of the actual sewage pipe.

[0004] At present, there is no sewage pollutant deposition simulation system and related calculation method that integrates multiple factors such as flow rate-flow coordinated control, replaceable pipe diameter and spatial high concentration. The present invention provides a sewage pollutant deposition simulation system and calculation method under different pipe diameters with high spatial concentration, which solves the problem that the sewage flow rate, sewage liquid level, pipeline environment cannot be accurately controlled when simulating the actual operation state of the sewage pipe, and a set of systems cannot match multiple pipe diameters. The spiral design of the corrugated hose in the pipe circulation pool saves a lot of system space, and the effect of simulating a long pipe is achieved in a smaller space. At the same time, the outer spiral thread of the water inlet and the water outlet can match corrugated hoses of various diameters. A set of devices can realize the simulation of sewage pipes with different diameters, and the overall spatial concentration is high. Combining the peristaltic pump speed regulation with the slope adjustment of the corrugated hose can achieve coordinated control of the sewage flow rate and liquid level, and the control accuracy is high. By laying pipeline environmental media including sand, soil, and water in the pipeline circulation pool, and burying the corrugated hose under different environmental conditions based on the actual operating status of the sewage pipeline, it is possible to create pipeline environmental conditions close to the actual ones, breaking through the problem that the previous sewage pipeline simulation device could not create environmental conditions such as temperature, humidity, and external water influence due to direct exposure to the air. The symmetry between the sewage deposition simulation system and the actual sewage pipeline operating conditions is fully improved, and the reliability of the simulation system's experimental data and operating results is enhanced, providing an important tool for studying the pipeline deposition of domestic sewage pollutants, and helping to improve the quality and efficiency of sewage treatment and the urban water environment. Summary of the invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the present invention is to propose a sewage pollutant deposition simulation system and calculation method with different pipe diameters, which can effectively solve a series of problems such as the large footprint of the sewage pollutant deposition simulation device, single function, difficulty in coordinated control of sewage flow rate and liquid level, and inability to simulate the actual sewage pipeline operating environment conditions, thereby realizing the simulation and calculation of sewage pollutant deposition with different pipe diameters.

[0006] In order to solve the above technical problems, the present invention provides a system for simulating the deposition of pollutants in sewage with different pipe diameters.

[0007] It comprises a rectangular tank body and a peristaltic pump; the rectangular tank body is provided with a water inlet pool, a pipeline circulation pool and a water outlet pool, and the top of the rectangular tank body is sealed with a cover plate; the peristaltic pump draws water in the water outlet pool back to the water inlet pool for circulation;

[0008] The pipeline circulation pool is provided with a vertically coiled corrugated hose, the upper end of which is a water inlet, and the lower end of which is a water outlet. A flow meter and a sampling port are provided along the coiling of the corrugated hose;

[0009] The water inlet pool is connected to the water inlet of the corrugated hose. The water inlet pool is provided with an overflow hole at a higher elevation than the water inlet of the corrugated hose, and the overflow water enters the water outlet pool; the water outlet of the corrugated hose is connected to the water outlet pool;

[0010] The water level of the inlet pool is higher than the water inlet of the corrugated hose, and the water outlet of the corrugated hose is higher than the water level of the outlet pool. The sewage in the corrugated hose flows by gravity.

[0011] Adjust the peristaltic pump flow rate, the water level of the water inlet pool, and control the flow rate of sewage in the corrugated hose;

[0012] By measuring the weight of the corrugated hose before and after the experiment, and the sewage concentration in the inlet pool, corrugated hose, and outlet pool at the beginning and during the experiment, the attenuation and deposition of sewage pollutants in the sewage pipe under different pipe diameters and different flow rates are coupled and calculated.

[0013] Preferably, the rectangular trough body is a rectangular box assembled from transparent acrylic plates, the interior of which is divided into three functional areas, namely, a water inlet pool, a water outlet pool and a pipeline circulation pool, by partitions, and connecting channels are provided in the three functional areas.

[0014] Preferably, two adjacent side walls of the water inlet pool are provided with a drainage hole and an overflow hole respectively;

[0015] An external spiral thread port is installed on the side of the drain hole close to the pipe circulation pool, and the water inlet of the corrugated hose is sleeved;

[0016] The overflow hole faces the outlet tank, and sewage exceeding the safe water level of the inlet tank overflows into the outlet tank;

[0017] An electronic stirring paddle is installed in the water inlet tank to prevent pollutants in the sewage from settling in the tank.

[0018] Preferably, a water receiving hole is opened on the side where the water outlet pool is connected to the pipeline circulation pool, and an external spiral thread mouth is installed to sleeve the water outlet of the corrugated hose.

[0019] The outlet pool is equipped with an electronic stirring paddle to prevent pollutants in the sewage from settling in the pool;

[0020] Preferably, a pipeline buckle is provided on the inner wall of the pipeline circulation pool to fix the corrugated hose;

[0021] The pipe clips are arranged along the spiral path from the water inlet to the water outlet of the corrugated hose and are retractable, so that corrugated hoses of different diameters can be fixed to fit tightly against the inner wall of the pipe circulation pool.

[0022] The corrugated hose is vertically provided with 1-2 sampling ports, which are sealed and connected to a safety corrugated hose section at a certain height to ensure that the sewage in the corrugated hose will not overflow from the sampling ports;

[0023] Preferably, a peristaltic pump water extraction hole and a water return hole are provided on the cover plate, and the water inlet pipe end and the water return pipe end of the peristaltic pump are respectively fixed to the bottom of the water outlet pool and the water inlet pool.

[0024] Preferably, the volume of the water inlet pool, the water outlet pool and the corrugated hose is calculated to calculate the overall circulating water volume of the system;

[0025] Initially, tap water is used to adjust the water level of the water inlet pool and the flow rate of the peristaltic pump, and the liquid in the corrugated hose is regulated to reach the set flow rate;

[0026] After the flow rate is regulated, drain the tap water in the system and use domestic sewage to conduct experiments according to the marked peristaltic pump speed / flow rate and the liquid levels of the inlet and outlet pools. During the process, the peristaltic pump speed / flow rate can be fine-tuned to make the sewage flow rate in the corrugated hose reach the set flow rate, and record the circulation time; and collect water samples in the corrugated hose at regular intervals and synchronously during the initial and circulation processes to determine pollutant indicators such as organic matter and nitrogen and phosphorus.

[0027] Preferably, the method for regulating the flow rate of liquid in the corrugated hose is: continuously add tap water to the water inlet pool; when the water level of the water inlet pool is higher than the water inlet of the corrugated hose, the tap water flows into the corrugated hose and merges into the water outlet pool; after the water outlet pool reaches a certain liquid level, start the peristaltic pump, adjust the peristaltic pump flow rate, control the water level of the water inlet pool to be lower than the overflow hole, observe the changes in the flow meter measured value on the corrugated hose, and when the flow rate measured by the flow meter is basically stable, record the peristaltic pump speed / flow rate and the liquid level of the water inlet pool and the water outlet pool.

[0028] Preferably, after a certain flow rate and a certain pipe diameter and a 5‰ slope sewage pipe are run for a period of time, the calculation formula for the attenuation of sewage pollutants is:

[0029]

[0030] Where: M t1 —Amount of sewage pollutant attenuation in the corrugated hose after running for t1 hours, kg;

[0031] C0—initial sewage pollutant concentration, mg / L;

[0032] C1—concentration of sewage pollutants in the corrugated hose after running for t1 hours, mg / L;

[0033] V—volume of corrugated hose, m 3 ;

[0034] Then draw a three-dimensional relationship diagram between flow velocity, operation time and pollutant attenuation under different pipe diameters to clarify the relationship between sewage pipe flow velocity and pollutant deposition attenuation response;

[0035] Before installing the corrugated hose, fill it with water, and measure the weight W0 of the corrugated hose after draining the water. After the experiment, drain the sewage in the corrugated hose and measure the weight W1 of the corrugated hose.

[0036] Preferably, the calculation formula for the pollutant deposition per unit length and per unit transfer time of a sewage pipe with a certain pipe diameter and a slope of 5‰ set in an experiment at a certain flow rate is:

[0037]

[0038] Where: K is the pollutant deposition amount per unit length and per unit transfer time of sewage pipe,

[0039] W0—wet weight of corrugated hose before the experiment, kg;

[0040] W1—wet weight of corrugated hose after the experiment, kg;

[0041] L—corrugated hose length, m;

[0042] t—cycle time, h;

[0043] Then, a two-dimensional relationship diagram between the flow velocity and the pollutant deposition amount per unit length and unit transfer time of the sewage pipe under different pipe diameters was drawn to clarify the relationship between the flow velocity of the sewage pipe and the pollutant deposition attenuation response.

[0044] The above technical solution of the present invention has the following advantages compared with the prior art:

[0045] The present invention addresses the problems of sewage pipe deposition simulation devices, such as large footprint, single function, difficulty in coordinated control of sewage flow rate and liquid level, and inability to simulate actual sewage pipe operating environment conditions. It breaks through the previous construction mode of sewage deposition simulation devices that focuses on "similarity in appearance" and proposes new structural designs and operating modes, such as a spiral arrangement of corrugated hoses, replaceable pipes of different diameters, and the ability to set different pipe burial conditions. It integrates flow rate-liquid level control, pipe diameter adjustment, and pipe burial environment adjustment in a relatively small space, thereby achieving a high degree of spatial intensiveness in the sewage deposition simulation system and broadening the scope of use of the sewage deposition simulation system.

[0046] The pollutant deposition simulation system and calculation method for sewage in different pipe diameters proposed in the present invention realizes the coordinated control of sewage flow rate and liquid level through the flow regulation of the precision peristaltic pump and the slope design of the corrugated hose, and can accurately reveal the pollutant deposition characteristics of pipeline sewage under different flow rates and liquid level operating conditions. At the same time, the system structure design is simple and easy, the manufacturing materials are common, the footprint is small, and it is suitable for indoor and outdoor places, with strong practicality.

[0047] Different from the traditional sewage pipe simulation device in which pipes of hundreds of meters or even thousands of meters are constructed for simulation and only one pipe diameter can be simulated at one time, the present invention provides a sewage deposition simulation system that is space-intensive, material-saving, and can be manufactured in one time to match multiple pipe diameters, which is beneficial to saving manufacturing and maintenance costs and is highly economical. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or technical descriptions will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 It is a three-dimensional structural diagram of the sewage pollutant deposition simulation system of the present invention;

[0050] Figure 2 It is a three-dimensional structural diagram of a rectangular tank body of a sewage pollutant deposition simulation system in the present invention;

[0051] Figure 3 It is a three-dimensional structural diagram of the corrugated hose of the sewage pollutant deposition simulation system in the present invention.

[0052] In the figure: A, rectangular tank; B, peristaltic pump; 1, cover plate; 2, corrugated hose buckle; 3, pipe circulation pool; 4, corrugated hose; 5, water inlet; 6, water inlet pool; 7, electronic stirring paddle of water inlet pool; 8, return water hole; 9, water extraction hole; 10, sampling port; 11, flow meter; 12, water outlet of corrugated hose; 13, electronic stirring paddle of water outlet pool; 14, overflow hole; 15, water outlet pool; 16, external spiral thread mouth of drain hole; 17, drain hole; 18, external spiral thread mouth of water collection hole; 19, water collection hole. DETAILED DESCRIPTION

[0053] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0054] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0055] The present invention provides a system for simulating the deposition of pollutants in sewage with different pipe diameters.

[0056] It comprises a rectangular tank body A and a peristaltic pump B; a water inlet pool 6, a pipeline circulation pool 3 and a water outlet pool 15 are separately arranged in the rectangular tank body, and a cover plate 1 is encapsulated on the top of the rectangular tank body; the peristaltic pump draws water in the water outlet pool back to the water inlet pool for circulation;

[0057] The pipeline circulation pool is provided with a vertically coiled corrugated hose 4, the upper end of which is a water inlet 5, and the lower end of which is a water outlet. A velocity meter 11 and a sampling port 10 are provided along the coiling of the corrugated hose.

[0058] The water inlet pool is connected to the water inlet of the corrugated hose. The water inlet pool is provided with an overflow hole 14 at a higher elevation than the water inlet of the corrugated hose, and the overflow water enters the water outlet pool; the water outlet 12 of the corrugated hose is connected to the water outlet pool;

[0059] The water level of the inlet pool is higher than the water inlet of the corrugated hose, and the water outlet of the corrugated hose is higher than the water level of the outlet pool. The sewage in the corrugated hose flows by gravity.

[0060] Adjust the peristaltic pump flow rate, the water level of the water inlet pool, and control the flow rate of sewage in the corrugated hose;

[0061] By measuring the weight of the corrugated hose before and after the experiment, and the sewage concentration in the inlet pool, corrugated hose, and outlet pool at the beginning and during the experiment, the attenuation and deposition of sewage pollutants in the sewage pipe under different pipe diameters and different flow rates are coupled and calculated.

[0062] Preferably, the rectangular trough body is a rectangular box assembled from transparent acrylic plates, the interior of which is divided into three functional areas, namely, a water inlet pool, a water outlet pool and a pipeline circulation pool, by partitions, and connecting channels are provided in the three functional areas.

[0063] Preferably, two adjacent side walls of the water inlet pool are provided with a drainage hole 17 and an overflow hole respectively;

[0064] The outer spiral thread mouth 16 of the drain hole is installed on the side of the drain hole close to the pipeline circulation pool, and the water inlet of the corrugated hose is sleeved;

[0065] The overflow hole faces the outlet tank, and sewage exceeding the safe water level of the inlet tank overflows into the outlet tank;

[0066] The water inlet pool is provided with an electronic stirring paddle 7 to prevent pollutants in the sewage from being deposited in the pool.

[0067] Preferably, a water receiving hole 19 is opened on the side where the water outlet pool is connected to the pipeline circulation pool, and a spiral thread mouth 18 outside the water receiving hole is installed to sleeve the water outlet of the corrugated hose.

[0068] The outlet pool is provided with an electronic stirring paddle 13 to prevent pollutants in the sewage from being deposited in the pool;

[0069] Preferably, a pipeline buckle is provided on the inner wall of the pipeline circulation pool to fix the corrugated hose;

[0070] The pipe clips are arranged along the spiral path from the water inlet to the water outlet of the corrugated hose and are retractable, so that corrugated hoses of different diameters can be fixed to fit tightly against the inner wall of the pipe circulation pool.

[0071] The corrugated hose is vertically provided with 1-2 sampling ports, which are sealed and connected to a safety corrugated hose section at a certain height to ensure that the sewage in the corrugated hose will not overflow from the sampling ports;

[0072] Preferably, a peristaltic pump water extraction hole 9 and a water return hole 8 are provided on the cover plate, and the water inlet pipe end and the water return pipe end of the peristaltic pump are respectively fixed to the bottom of the water outlet pool and the water inlet pool.

[0073] Preferably, the volume of the water inlet pool, the water outlet pool and the corrugated hose is calculated to calculate the overall circulating water volume of the system;

[0074] Initially, tap water is used to adjust the water level of the water inlet pool and the flow rate of the peristaltic pump, and the liquid in the corrugated hose is regulated to reach the set flow rate;

[0075] After the flow rate is regulated, drain the tap water in the system and use domestic sewage to conduct experiments according to the marked peristaltic pump speed / flow rate and the liquid levels of the inlet and outlet pools. During the process, the peristaltic pump speed / flow rate can be fine-tuned to make the sewage flow rate in the corrugated hose reach the set flow rate, and record the circulation time; and collect water samples in the corrugated hose at regular intervals and synchronously during the initial and circulation processes to determine pollutant indicators such as organic matter and nitrogen and phosphorus.

[0076] Preferably, the method for regulating the flow rate of liquid in the corrugated hose is: continuously add tap water to the water inlet pool; when the water level of the water inlet pool is higher than the water inlet of the corrugated hose, the tap water flows into the corrugated hose and merges into the water outlet pool; after the water outlet pool reaches a certain liquid level, start the peristaltic pump, adjust the peristaltic pump flow rate, control the water level of the water inlet pool to be lower than the overflow hole, observe the changes in the flow meter measured value on the corrugated hose, and when the flow rate measured by the flow meter is basically stable, record the peristaltic pump speed / flow rate and the liquid level of the water inlet pool and the water outlet pool.

[0077] Preferably, after a certain flow rate and a certain pipe diameter and a 5‰ slope sewage pipe are run for a period of time, the calculation formula for the attenuation of sewage pollutants is:

[0078]

[0079] Where: M t1 —Amount of sewage pollutant attenuation in the corrugated hose after running for t1 hours, kg;

[0080] C0—initial sewage pollutant concentration, mg / L;

[0081] C1—concentration of sewage pollutants in the corrugated hose after running for t1 hours, mg / L;

[0082] V—volume of corrugated hose, m 3 ;

[0083] Then draw a three-dimensional relationship diagram between flow velocity, operation time and pollutant attenuation under different pipe diameters to clarify the relationship between sewage pipe flow velocity and pollutant deposition attenuation response;

[0084] Before installing the corrugated hose, fill it with water, and measure the weight W0 of the corrugated hose after draining the water. After the experiment, drain the sewage in the corrugated hose and measure the weight W1 of the corrugated hose.

[0085] Preferably, the calculation formula for the pollutant deposition per unit length and per unit transfer time of a sewage pipe with a certain pipe diameter and a slope of 5‰ set in an experiment at a certain flow rate is:

[0086]

[0087] Where: K is the pollutant deposition amount per unit length and per unit transfer time of sewage pipe,

[0088] W0—wet weight of corrugated hose before the experiment, kg;

[0089] W1—wet weight of corrugated hose after the experiment, kg;

[0090] L—corrugated hose length, m;

[0091] t—cycle time, h;

[0092] Then, a two-dimensional relationship diagram between the flow velocity and the pollutant deposition amount per unit length and unit transfer time of the sewage pipe under different pipe diameters was drawn to clarify the relationship between the flow velocity of the sewage pipe and the pollutant deposition attenuation response.

[0093] In addition, in the present invention, preferably, the corrugated hose is fixed on the inner wall of the rectangular parallelepiped tank body by means of the corrugated hose buckle 2 .

[0094] In order to more clearly illustrate the specific implementation mode of the present invention, an embodiment is provided below:

[0095] The present invention provides a system and method for simulating the deposition of pollutants in sewage with different pipe diameters. In one embodiment, the system and method for simulating the deposition of pollutants in sewage with different pipe diameters are described in detail. Figure 1 As shown, the pipe circulation pool of the sewage pollutant deposition simulation system with different pipe diameters is set as a rectangular parallelepiped of 120cm×40cm×40cm, the water inlet pool of the sewage pollutant deposition simulation system with different pipe diameters is a cube with a side length of 20cm and a volume of 8L, and its two adjacent side walls are respectively provided with a water inlet with a diameter of 5cm and an overflow hole with a diameter of 5cm. The water inlet is connected to an external spiral thread mouth of the same diameter extending to the pipe circulation pool, and the overflow hole overflows toward the outlet pool. The water inlet is located at the center of the square, and the center of the overflow hole is 5cm higher than the center of the water inlet.

[0096] The outlet pool of the sewage pollutant deposition simulation system with different pipe diameters is a cube with a side length of 20 cm and a volume of 8 L. A water outlet with a diameter of 5 cm is set at the bottom of the interface between the outlet pool and the pipeline circulation pool. The water outlet is connected to an external spiral thread mouth of the same diameter and extends to the pipeline circulation pool.

[0097] The corrugated hose of the sewage pollutant deposition simulation system with different pipe diameters is connected to the water inlet at the front end and the water outlet at the rear end. The middle section is fixed by the pipe clip and spirals downward against the inner wall of the pipe circulation pool.

[0098] The pipeline environmental medium of the sewage pollutant deposition simulation system with different pipe diameters is filled in the pipeline circulation pool. It is composed of original soil with a moisture content of 20% to 30%. The corrugated hose is buried in it to provide relatively stable temperature, humidity and other environmental conditions for the pipeline.

[0099] The peristaltic pump of the sewage pollutant deposition simulation system with different pipe diameters is placed on the cover plate. Both ends of the peristaltic pump tube pass through the holes in the cover plate and are fixed to the bottom of the inlet pool and the outlet pool respectively. The sewage with different flow rates is pumped from the outlet pool to the inlet pool through the speed regulation of the peristaltic pump.

[0100] The cover plate of the sewage pollutant deposition simulation system with different pipe diameters is a rectangle of 140cm×40cm, which is used to cover the water inlet pool, the water outlet pool, the pipeline circulation pool and support the peristaltic pump, and is provided with two holes for the peristaltic pump tube to pass through.

[0101] Taking the simulation and calculation of domestic sewage deposition in a residential area of ​​a certain city as an example, the domestic sewage from the household pipes of the residential area is extracted to fill the inlet and outlet pools of the device, and the peristaltic pump pipe is connected to start the circulation. The pipe is a corrugated hose with a diameter of 20 cm. The opening and closing degree of the overflow hole valve of the inlet pool is adjusted to control the relative stability of the corrugated hose liquid level. The peristaltic pump speed is adjusted and the flow meter is observed in real time to show that the flow rate reaches 0.3m / s. The flow rate is kept circulating for 12h. After the operation is completed, the corrugated hose is taken out to collect and test the sediment at the bottom of the pipe in full, and the change of sewage pollutant concentration at the beginning and end of the operation is tested at the same time. The sewage flow rate is adjusted to 0.6m / s and 0.8m / s respectively and the above procedures are repeated. According to formula (1) and formula (2), the attenuation of sewage pollutants and the deposition of sewage pollutants at different flow rates are calculated respectively. The simulation system of the present invention was used to carry out sewage pollutant deposition operation experiments at different flow rates. After running for 12 hours at flow rates of 0.3 m / s, 0.6 m / s, and 0.8 m / s, the sewage BOD5 attenuation was 3.5×10 -3 kg, 1.5×10 -3 kg, 0.3×10 -3 kg, and the sewage TP attenuation was 0.3×10 -4 kg, 0.2×10 -4 kg, 0.1×10 -4 kg, and the TN attenuation of sewage was 1.3×10 -4 kg, 0.4×10 -4 kg, 0.1×10 -4 kg; the sedimentation amount per unit length and per unit transfer time of sewage BOD5 pipeline is respectively The sedimentation per unit length and per unit transfer time of sewage TP pipeline is The sedimentation per unit length and per unit transfer time of sewage TN pipeline is The results of sedimentation simulation calculations show that the sedimentation effect of domestic sewage pollutants in residential source areas is relatively strong, and the work of improving the quality and efficiency of sewage systems should focus on the sedimentation prevention and control of pollutants in the source community pipelines.

[0102] Finally, it is preferred that the parts of the present invention not fully described adopt mature products and mature technical means in the prior art.

[0103] It should be noted that the above specific implementation methods are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that the technical solutions of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should be included in the scope of the claims of the present invention.

Claims

1. The sewage pollutant deposition simulation system with different pipe diameters is characterized by: The invention comprises a rectangular tank body (A) and a peristaltic pump (B); a water inlet pool (6), a pipeline circulation pool (3) and a water outlet pool (15) are separately arranged in the rectangular tank body (A), and a sealing cover plate (1) is provided on the top of the rectangular tank body (A); the peristaltic pump (B) pumps water in the water outlet pool (15) back to the water inlet pool (6) for circulation; The pipeline circulation pool (3) is provided with a vertically coiled corrugated hose (4), the upper end of the corrugated hose is a water inlet (5), the lower end is a water outlet (12), and a flow meter (11) and a sampling port (10) are provided along the coiling of the corrugated hose; The water inlet pool (6) is connected to the water inlet (5) of the corrugated hose, and the water inlet pool (6) is provided with an overflow hole (14) whose elevation is higher than that of the water inlet of the corrugated hose, and the overflow water enters the water outlet pool (15); the water outlet (12) of the corrugated hose is connected to the water outlet pool (15); The water level of the water inlet pool (6) is higher than the water inlet of the corrugated hose (5), the water outlet of the corrugated hose (12) is higher than the water level of the water outlet pool (15), and the sewage of the corrugated hose (4) flows by gravity; Regulating the flow rate of the peristaltic pump (B) and the water level of the water inlet pool (6) to control the flow rate of sewage in the corrugated hose (4); By measuring the weight of the corrugated hose (4) before and after the experiment, and the sewage concentration in the water inlet pool (6), the corrugated hose (4), and the water outlet pool (15) at the beginning of the experiment and during the experiment, the attenuation and deposition of sewage pollutants in the sewage pipe under different pipe diameters and different flow rates are coupled and calculated.

2. The system for simulating the deposition of pollutants in sewage with different pipe diameters according to claim 1, characterized in that: The rectangular tank body (A) is a rectangular box body assembled from transparent acrylic plates, and is internally divided into three functional areas, namely, a water inlet pool (6), a water outlet pool (15) and a pipeline circulation pool (3), by partitions, and the three functional areas are all provided with connecting channels.

3. The system for simulating the deposition of pollutants in sewage with different pipe diameters according to claim 1, characterized in that: Two adjacent side walls of the water inlet pool (6) are respectively provided with a drainage hole (17) and an overflow hole (14); An external spiral thread port (16) is installed on one side of the drainage hole (17) close to the pipeline circulation pool (3) and is sleeved with the water inlet (5) of the corrugated hose; The overflow hole (14) faces the outlet pool (15), and sewage exceeding the safe water level of the inlet pool (6) overflows into the outlet pool (15); The water inlet pool (6) is provided with a water inlet pool electronic stirring paddle (7) to prevent pollutants in the sewage from being deposited in the pool.

4. The system for simulating the deposition of pollutants in sewage with different pipe diameters according to claim 1, characterized in that: A water receiving hole (19) is provided on the side of the water outlet pool (15) connected to the pipeline circulation pool (3), and an external spiral thread (18) is installed to sleeve the water outlet (12) of the corrugated hose. The outlet pool is provided with an outlet pool electronic stirring paddle (13) to prevent pollutants in the sewage from being deposited in the pool.

5. The system for simulating the deposition of pollutants in sewage with different pipe diameters according to claim 1, characterized in that: The inner wall of the pipeline circulation pool (3) is provided with a pipeline buckle (2) for fixing the corrugated hose (4); The pipeline buckle (2) is arranged along a spiral path from the water inlet (5) to the water outlet (12) of the corrugated hose and is retractable, and can fix corrugated hoses (4) of different diameters so that they are closely attached to the inner wall of the pipeline circulation pool (3). The corrugated hose (4) is provided with 1-2 sampling ports (10) vertically along the length of the hose, and the sampling ports (10) are sealed and connected to a safety corrugated hose section at a certain height to ensure that sewage in the corrugated hose (4) will not overflow from the sampling ports (10).

6. The system for simulating the deposition of pollutants in sewage with different pipe diameters according to claim 1, characterized in that: The cover plate (1) is provided with a water extraction hole (9) and a water return hole (8) of the peristaltic pump (B), and the water inlet pipe end and the water return pipe end of the peristaltic pump (B) are respectively fixed to the bottom of the water outlet pool (15) and the water inlet pool (6).

7. A calculation method for the pollutant deposition simulation system of sewage with different pipe diameters according to claim 1, characterized in that: Calculate the volumes of the water inlet pool (6), the water outlet pool (15) and the corrugated hose (4), and calculate the overall circulating water volume of the system; Initially, the water level of the water inlet pool (6) and the flow rate of the peristaltic pump (B) are adjusted by tap water, and the liquid in the corrugated hose (4) is regulated to reach a set flow rate; After the flow rate control is completed, the tap water in the system is drained, and the experiment is carried out with domestic sewage according to the marked speed / flow rate of the peristaltic pump (B) and the liquid levels of the water inlet pool (6) and the water outlet pool (15). During the process, the speed / flow rate of the peristaltic pump (B) can be fine-tuned so that the sewage flow rate in the corrugated hose (4) reaches the set flow rate, and the circulation time is recorded; and water samples in the corrugated hose (4) are collected synchronously at regular intervals during the initialization and circulation process to determine the pollutant indicators such as organic matter and nitrogen and phosphorus.

8. The calculation method of the pollutant deposition simulation system for sewage with different pipe diameters according to claim 7 is characterized by: The method for regulating the flow rate of the liquid in the corrugated hose (4) is as follows: continuously adding tap water to the water inlet pool (6); when the water level of the water inlet pool (6) is higher than the water inlet (5) of the corrugated hose, the tap water flows into the corrugated hose (4) and merges into the water outlet pool (15); after the water outlet pool (15) reaches a certain liquid level, the peristaltic pump (B) is started, the flow rate of the peristaltic pump (B) is adjusted, the water level of the water inlet pool (6) is controlled to be lower than the overflow hole (14), and the change of the measured value of the flow meter (11) on the corrugated hose (4) is observed; when the flow rate measured by the flow meter (11) is basically stable, the number of revolutions / flow rate of the peristaltic pump (B) and the liquid levels of the water inlet pool (6) and the water outlet pool (15) are recorded.

9. The calculation method of the pollutant deposition simulation system for sewage with different pipe diameters according to claim 7 is characterized by: After a certain flow rate, a certain pipe diameter and a 5‰ slope sewage pipe are run for a period of time, the calculation formula for the attenuation of sewage pollutants is: Where: M t1 —Amount of sewage pollutants attenuated in the corrugated hose after t1 hours of operation, kg; C0—initial sewage pollutant concentration, mg / L; C1—concentration of sewage pollutants in the corrugated hose after running for t1 hours, mg / L; V—the volume of the corrugated hose, m 3 ; Then draw a three-dimensional relationship diagram between flow velocity, operation time and pollutant attenuation under different pipe diameters to clarify the relationship between sewage pipe flow velocity and pollutant deposition attenuation response; Before installing the corrugated hose (4), the interior of the corrugated hose (4) is filled with water, and after draining the water, the weight W0 of the corrugated hose (4) is measured. After the experiment is over, the weight W1 of the corrugated hose is measured after draining the sewage in the corrugated hose (4).

10. The calculation method of the pollutant deposition simulation system for sewage with different pipe diameters according to claim 7 is characterized by: The calculation formula for the pollutant deposition per unit length and per unit transfer time of a sewage pipe with a certain pipe diameter and a slope of 5‰ set in the experiment at a certain flow rate is: Where: K is the pollutant deposition amount per unit length and per unit transfer time of sewage pipe, W0—wet weight of the corrugated hose before the experiment, kg; W1—wet weight of the corrugated hose after the experiment, kg; L—the length of the corrugated hose, m; t—the cycle time, h; Then, a two-dimensional relationship diagram between the flow velocity and the pollutant deposition amount per unit length and unit transfer time of the sewage pipe under different pipe diameters was drawn to clarify the relationship between the flow velocity of the sewage pipe and the pollutant deposition attenuation response.

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