Online monitoring device for BOD (Biochemical Oxygen Demand) of water body

Abstract

A water body BOD online monitoring device comprises a monitoring ship, an electric coiler is installed at one end of the monitoring ship, a stirring tank, an alkali liquor tank, an acid liquor tank, a reaction tank and a control system are arranged in the monitoring ship, a sampling pipe is wound on the electric coiler, one end of the sampling pipe is connected with a first balancing weight sinking into a water body, and the other end of the sampling pipe is connected with a second balancing weight sinking into the water body. The other end of the sampling pipe is communicated with the upper end of the stirring tank through a sampling pump, the alkali liquor tank and the acid liquor tank are communicated with the upper end of the stirring tank through an acid liquor pipe and an alkali liquor pipe respectively, an acid liquor pump and an alkali liquor pump are installed on the acid liquor pipe and the alkali liquor pipe respectively, and the bottom of the stirring tank is communicated with the bottom of the reaction tank through a first drainage pipe. The top of the reaction tank is communicated with an overflow pipe, a filtering pore plate is arranged in the reaction tank, and microorganism reaction particles are paved on the filtering pore plate. According to the utility model, the BOD of water bodies with different depths can be monitored on line.

Description

Technical Field

[0001] The utility model relates to a water body BOD online monitoring device. Background Art

[0002] In water environment monitoring, BOD is a key indicator for assessing organic pollution in water bodies. Existing BOD sampling devices are mostly manually operated, resulting in complex operation and unstable sample storage. Furthermore, traditional sampling devices typically only collect single samples and are unable to continuously monitor changes in BOD values ​​at a set depth, limiting the real-time and accuracy of the data. Utility Model Content

[0003] The purpose of the utility model is to provide a water body BOD online monitoring device, which can perform online monitoring of the BOD of water bodies at different depths.

[0004] In order to solve the above problems, the technical solution of the utility model is:

[0005] A water body BOD online monitoring device includes a monitoring vessel, an electric hose reel installed at one end of the monitoring vessel, and a stirring tank, an alkali liquid tank, an acid liquid tank, a reaction tank, and a control system provided inside the monitoring vessel. A sampling tube is wound around the electric hose reel, one end of the sampling tube is connected to a first counterweight block submerged in the water body, and the other end of the sampling tube is connected to the upper end of the stirring tank via a sampling pump. The alkali liquid tank and the acid liquid tank are connected to the upper end of the stirring tank via an alkali liquid pipe and an acid liquid pipe, respectively. An acid liquid pump and an alkali liquid pump are installed on the acid liquid pipe and the alkali liquid pipe, respectively. The bottom of the stirring tank is connected to the bottom of the reaction tank via a first drain pipe, a drain pump is installed on the first drain pipe, and an overflow pipe is connected to the top of the reaction tank. A filter plate is provided in the reaction tank, and microbial reaction particles are laid on the filter plate.

[0006] The control system includes a controller, a BOD analyzer and a Ph value sensor. The Ph value sensor is installed on the stirring tank and connected to the controller input end. The two electrodes in the BOD analyzer are respectively installed on the first drain pipe and the overflow pipe. The BOD analyzer is connected to the controller for communication. The electric hose reel, acid pump, alkali pump and drainage pump are connected to the controller output end. The controller communicates with the user through a wireless communication module.

[0007] An aeration pipe is installed at the bottom of the reaction tank, and the aeration pipe is connected to the air filter through the air inlet pipe. An air pump is installed on the air inlet pipe, and the air pump is connected to the output end of the controller.

[0008] It also includes a flushing system, which includes a first three-way valve and a second three-way valve respectively connected to the sampling tubes at both ends of the sampling pump. The first three-way valve is connected to the second counterweight block submerged in the water body through the first flushing pipe, and the second three-way valve is connected to the upper end of the mixing tank through the second flushing pipe. A water purifier is installed on the second flushing pipe. The first three-way valve and the second three-way valve are connected to the output end of the controller.

[0009] It also includes a second drain pipe, one end of which is connected to the first drain pipe. A stop valve is installed on the second drain pipe, and the stop valve is connected to the output end of the controller.

[0010] A liquid level sensor is installed on the mixing tank and is connected to the control input terminal.

[0011] The beneficial effects of the utility model are: first, it can measure the BOD of water bodies at any depth in different water areas online and achieve real-time monitoring; second, the entire measurement process is automated without the need for human intervention; finally, the device structure is simple and the water body measurement accuracy is high. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The present invention will be further described below with reference to the accompanying drawings:

[0013] Figure 1 This is a schematic diagram of the structure of the utility model.

[0014] Figure 2 This is a schematic diagram of the main structure of the utility model.

[0015] Figure 3 This is a schematic diagram of the structure of the electric hose reel of the present utility model.

[0016] Figure 4 This is a schematic diagram of the circuit structure of the utility model.

[0017] In the figure: first counterweight 101, second counterweight 102, stirring tank 111, alkali liquid tank 112, acid liquid tank 113, reaction tank 114, reaction particles 120, filter plate 121, monitoring ship 130, aeration pipe 201, second flushing pipe 202, overflow pipe 203, first drain pipe 204, acid liquid pipe 205, alkali liquid pipe 206, second drain pipe 207, air inlet pipe 208, sampling pipe 209, electric disk Pipe device 300, servo reduction motor 301, roller 302, float 400, first three-way valve 501, second three-way valve 502, stop valve 503, sampling pump 601, alkali liquid pump 602, acid liquid pump 603, drainage pump 604, air pump 605, coarse filter 700, water purifier 800, liquid level sensor 901, BOD analyzer 902, Ph value sensor 903, conical iron block 1011, steel pipe 1012. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] like Figures 1 to 4 As shown, an online monitoring device for BOD of water includes a monitoring vessel 130. The monitoring vessel 130 can be a remote-controlled vessel or a navigation buoy vessel. When monitoring water in a reservoir, a remote-controlled vessel can be selected, so that water bodies at different positions and depths of the reservoir can be monitored; when monitoring river water or river water, a navigation buoy vessel can be selected. Because river water is flowing, there is no need to consider the position, so a navigation buoy vessel with a lower cost can be selected; an electric reel 300 is installed at one end of the monitoring vessel 130. The hose reel 300 includes a drum 302 and a servo reduction motor 301 connected to the drum 302. The servo reduction motor 301 drives the drum to rotate. A stirring tank 111, an alkali tank 112, an acid tank 113, a reaction tank 114, and a control system are provided in the monitoring vessel 130. The alkali tank 112 is filled with a sodium hydroxide solution, and the acid tank 113 is filled with a zinc sulfate solution. The sampling tube 209 is wound around the drum in the electric hose reel 300. The drum retracts and extends the sampling tube 209 to adjust the first counterweight block 10 in the water body. 1 sinking depth is adjusted, the first counterweight block 101 has the same structure as the second counterweight block 102 described below, including a conical iron block 1011, a steel pipe 1012 is connected to the conical iron block 1011, a water inlet hole is opened on the steel pipe 1012, a sampling tube 209 is connected to the steel pipe through a clamp at one end, and the other end of the sampling tube 209 is connected to the upper end of the stirring tank 111 through the sampling pump 601, and the alkali liquid tank 112 and the acid liquid tank 113 are connected to the stirring tank 11 through the alkali liquid pipe 206 and the acid liquid pipe 205 respectively. 1, an acid pump 603 and an alkali pump 602 are installed on the acid pipe 205 and the alkali pipe 206 respectively. The bottom of the stirring tank 111 is connected to the bottom of the reaction tank 114 through the first drain pipe 204. The drainage pump 604 is installed in the first drain pipe 204. The top of the reaction tank 114 is connected to the overflow pipe 203. A filter plate 121 is provided in the reaction tank 114. Microbial reaction particles 120 are laid on the filter plate 121. The microbial reaction particles 120 are porous ceramsite balls with microorganisms fixed thereon.

[0020] The control system includes a controller, a BOD analyzer 902 and a Ph value sensor 903. The controller is a PLC controller. The Ph value sensor 903 is installed on the stirring tank 111. The Ph value sensor is connected to the input end of the controller. The Ph value sensor transmits the monitored data to the controller. The two electrodes in the BOD analyzer 902 are respectively installed on the first drain pipe 204 and the overflow pipe 203. The BOD analyzer 902 is connected to the controller for communication. The electric hose reel 300, the acid pump 603, the alkali pump 602 and the drain pump 604 are connected to the output end of the controller. The controller communicates with the user through a 4G wireless communication module. The user is a mobile phone, iPad or computer. The servo reduction motor in the electric hose reel 300 is connected to the PLC controller through the servo controller. The PLC controller can control the number of turns of the drum on the sampling tube 209 by sending a pulse signal of a specified number and direction to the servo reduction motor, thereby adjusting the depth of the first counterweight block 101 in the water body.

[0021] An aeration pipe 201 is installed at the bottom of the reaction tank 114, and the aeration pipe 201 is connected to the air filter through an air inlet pipe 208. An air pump 605 is installed on the air inlet pipe 208, and the air pump 605 is connected to the output end of the controller. The air pump 605 is controlled to start and stop by the controller.

[0022] The implementation process of the present invention is as follows: after the electric hose reel 300 sinks the first counterweight to the set depth of the water body, the sampling pump 601 draws river water from the water body into the mixing tank 111, and then the air pump 605 is started to bubble and stir the river water and oxygenate it. At the same time, the Ph value sensor detects the Ph value of the river water. If it is acidic, the alkali solution pump 602 is started to send the alkali solution into the mixing tank 111. If it is alkaline, the acid solution is pumped into the mixing tank 111 to adjust the Ph value of the river water to 7; then the drainage pump 604 draws the river water from the mixing tank 111 into the reaction tank 114 and discharges it from the overflow pipe 203. During this process, the bacteria in the river water are adsorbed on the microbial reaction particles 120, and the BOD analyzer 902 measures the BOD value of the river water. The measurement principle is to use the Michaelis equation: V = Vmax*(C / Km+C), where V is the reaction rate, Vmax is the maximum reaction rate, and C is the maximum reaction rate. is the substrate concentration, and Km is the Michaelis constant. After obtaining the test results, the controller transmits the data to the user via the 4G wireless communication module.

[0023] It also includes a flushing system, which includes a first three-way valve 501 and a second three-way valve 502 respectively connected to the sampling tubes 209 at both ends of the sampling pump 601. The first three-way valve 501 is connected to the second counterweight block 102 submerged in the water body through the first flushing pipe. A float 400 is installed on the first flushing pipe. The float 400 is used to limit the sinking depth of the second counterweight block 102, so that the second counterweight block 102 is at a depth of 0.5 to 1 meter underwater. The river water at this position is relatively clean and suitable for flushing. The second three-way valve 502 is connected to the upper end of the mixing tank 111 through the second flushing pipe 202. A water purifier 800 is installed on the second flushing pipe 202. The first three-way valve 501 and the second three-way valve 502 are connected to the output end of the controller.

[0024] It also includes a second drain pipe 207, one end of which is connected to the first drain pipe 204. A stop valve 503 is installed on the second drain pipe 207, and the stop valve 503 is connected to the controller output end, the first three-way valve 501, the second three-way valve 502 and the stop valve 503. After the first measurement of the river water is completed, the controller first opens the stop valve 503, switches the first three-way valve 501 and the second three-way valve 502, and starts the drainage pump 604 to drain the river water in the stirring tank 111 and the reaction tank 114, then closes the stop valve 503, and starts the sampling pump 601. The sampling pump 601 draws river water through the water purifier 800 to flush the stirring tank 111 and the reaction tank 114, and flushes the residual water in the stirring tank 111 and the reaction tank 114. After the flushing is completed, the sampling pump 601 is closed, the first three-way valve 501 and the second three-way valve 502 are switched again, the stop valve 503 is opened and the drainage pump 604 is started to drain the water in the stirring tank 111 and the reaction tank 114. In this way, the monitoring device will not be affected by the last river water when it is used next time, thereby ensuring the accuracy and reliability of the detection results.

[0025] A liquid level sensor 901 is installed on the mixing tank 111 and is connected to the control input terminal. The liquid level sensor 901 is used for real-time detection of the water level.

[0026] A coarse filter 700 is installed on the sampling tube 209. When testing the bottom river water, the coarse filter 700 can effectively filter out the water plants, sand and gravel and other debris in the river water, and protect the sampling pump 601 and the reaction particles 120.

[0027] The contents described in the embodiments of this specification are merely an enumeration of the implementation forms of the utility model concept. The protection scope of the utility model should not be regarded as limited to the specific forms described in the embodiments. The protection scope of the utility model also extends to equivalent technical means that can be thought of by those skilled in the art based on the concept of the utility model.

Claims

1. A water BOD online monitoring device, characterized by: The monitoring vessel (130) includes an electric hose reel (300) installed at one end of the monitoring vessel (130), a stirring tank (111), an alkali liquid tank (112), an acid liquid tank (113), a reaction tank (114) and a control system are provided in the monitoring vessel (130), a sampling tube (209) is wound around the electric hose reel (300), one end of the sampling tube (209) is connected to a first counterweight (101) sunk in the water body, and the other end of the sampling tube (209) is connected to the upper end of the stirring tank (111) through a sampling pump (601), and the alkali liquid tank (112) and the acid liquid tank (113) are respectively connected through the alkali liquid. The pipe (206) and the acid pipe (205) are connected to the upper end of the stirring tank (111), and an acid pump (603) and an alkali pump (602) are installed on the acid pipe (205) and the alkali pipe (206), respectively. The bottom of the stirring tank (111) is connected to the bottom of the reaction tank (114) through the first drainage pipe (204), and a drainage pump (604) is installed on the first drainage pipe (204). The top of the reaction tank (114) is connected to an overflow pipe (203). A filter plate (121) is provided in the reaction tank (114), and microbial reaction particles (120) are laid on the filter plate (121); The control system includes a controller, a BOD analyzer (902) and a Ph value sensor (903), wherein the Ph value sensor (903) is installed on the stirring tank (111), and the Ph value sensor (903) is connected to the input end of the controller. Two electrodes in the BOD analyzer (902) are respectively installed on the first drainage pipe (204) and the overflow pipe (203). The BOD analyzer (902) is connected to the controller for communication, and the electric hose reel (300), the acid pump (603), the alkali liquid pump (602) and the drainage pump (604) are connected to the output end of the controller. The controller is connected to the user for communication via a wireless communication module.

2. A water body BOD online monitoring device according to claim 1, characterized in that: An aeration pipe (201) is installed at the bottom of the reaction tank (114). The aeration pipe (201) is connected to the air filter through the air inlet pipe (208). An air pump (605) is installed on the air inlet pipe (208). The air pump (605) is connected to the output end of the controller.

3. The water BOD online monitoring device according to claim 1, characterized in that: The flushing system further includes a flushing system, which includes a first three-way valve (501) and a second three-way valve (502) respectively connected to the sampling tubes (209) at both ends of the sampling pump (601), the first three-way valve (501) is connected to the second counterweight (102) submerged in the water body through the first flushing tube, the second three-way valve (502) is connected to the upper end of the stirring tank (111) through the second flushing tube (202), a water purifier (800) is installed on the second flushing tube (202), and the first three-way valve (501) and the second three-way valve (502) are connected to the output end of the controller.

4. The water BOD online monitoring device according to claim 3, characterized in that: The device further comprises a second drain pipe (207), one end of which is connected to the first drain pipe (204), and a stop valve (503) is installed on the second drain pipe (207), and the stop valve (503) is connected to the output end of the controller.

5. The water BOD online monitoring device according to any one of claims 1 to 4, characterized in that: A liquid level sensor (901) is installed on the stirring tank (111), and the liquid level sensor (901) is connected to the control input end.

6. The water BOD online monitoring device according to any one of claims 1 to 4, characterized in that: A coarse filter (700) is installed on the sampling tube (209).

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