A device for treating domestic sewage
By combining the PLC control cabinet and the liquid level electrode, the automation and precise control of the sewage dosing device are realized, which solves the problem of dosing fluctuation caused by manual operation in the existing technology and improves the stability and effect of sewage disinfection.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 贵州西电电力股份有限公司黔北发电厂
- Filing Date
- 2025-07-30
- Publication Date
- 2026-07-14
AI Technical Summary
The existing wastewater dosing system relies on manual operation for dosing, which makes it difficult to achieve precise control, resulting in large fluctuations in the dosage and affecting the disinfection effect.
The system employs a PLC control cabinet, along with level electrodes, jet pumps, and solenoid valves to achieve automated control of wastewater and chemicals. The PLC controls the jet pump to pressurize and simultaneously open and close the solenoid valves, ensuring that the chemicals enter the disinfection tank in the correct proportion.
It achieves automated and precise control of the wastewater dosing process, reduces manual intervention, and improves the stability and consistency of disinfection effects.
Smart Images
Figure CN224493961U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of wastewater treatment, specifically to a domestic wastewater treatment device. Background Technology
[0002] In domestic sewage treatment, sewage typically originates from residents' daily activities, such as kitchens, bathrooms, and laundry facilities. It contains a large amount of pollutants, including organic matter, pathogens, and suspended solids. To ensure that sewage meets national or local discharge standards before being discharged, disinfection is usually required. The purpose of disinfection is to remove or inactivate pathogenic microorganisms in sewage, prevent the spread of diseases through water bodies, and safeguard public health and safety. Disinfection by adding chemicals is a common sewage treatment technology, mainly used to kill pathogenic microorganisms, viruses, and bacteria in sewage to ensure that the effluent quality meets discharge standards. This technology is widely used in many fields, including medical sewage treatment, urban sewage treatment, and ship sewage treatment.
[0003] In existing wastewater dosing devices, due to the limitations of manual operation, the dosing process requires frequent adjustments, making it difficult to achieve precise control. Furthermore, the amount of chemicals to be added per unit volume of wastewater often relies on manual experience in actual operation, lacking automation and intelligence, resulting in large fluctuations in the dosing amount and affecting the disinfection effect. Utility Model Content
[0004] The present invention aims to provide a domestic sewage treatment device to solve the problem of excessive reliance on manual disinfection of sewage in the prior art.
[0005] To achieve the above objectives, the present invention adopts the following technical solution: a domestic sewage treatment device, comprising a collection section for collecting sewage, a treatment section connected to the collection section, and a filter connected to the treatment section. The treatment section treats the sewage collected from the collection section and sends the water to domestic use through the filter. The treatment section includes an equalization tank for solid-liquid separation of sewage, a biological treatment device connected to the equalization tank, and a disinfection tank. A jet pump is connected between the equalization tank and the biological treatment device. The jet pump is used to send the sewage in the equalization tank into the biological treatment device for treatment, and then the sewage flows by gravity to the disinfection tank. A dosing tank is connected to the disinfection tank. The dosing tank is used to store and dispense the dosing drugs and send the drugs into the disinfection tank. A manual valve and a solenoid valve are provided between the dosing tank and the disinfection tank. The treatment section is equipped with a PLC control cabinet. The solenoid valve and the jet pump are electrically connected through the PLC control cabinet. The jet pump is opened and closed, and the solenoid valve is opened and closed synchronously through the PLC control cabinet.
[0006] The beneficial effects of this solution are as follows: The PLC control cabinet drives the jet pump to spray and pressurize according to the liquid level in the regulating tank, thereby sending the sewage in the regulating tank into the biological treatment device for treatment and then flowing by gravity into the disinfection tank. In addition, the PLC also controls the solenoid valve to open in real time and sends the medicine in the dosing tank into the disinfection tank, thereby avoiding excessive reliance on manual discharge and realizing the automation of dosing.
[0007] Preferably, as an improvement, the regulating tank is equipped with a liquid level electrode, which is electrically connected to the PLC control cabinet. When sewage touches the liquid level electrode, the PLC controls the jet pump to spray and increase the pressure.
[0008] The beneficial effects are as follows: the liquid level electrode is electrically connected to the PLC control cabinet, realizing real-time monitoring of the liquid level in the regulating tank. When sewage touches the liquid level electrode, the PLC control cabinet can quickly determine and start the jet pump, thereby achieving accurate sensing of the water level, reducing manual intervention, and improving the automation level of the system.
[0009] Preferably, as an improvement, the height of the dosing tank is higher than the height of the disinfection tank, and a manual valve is also installed between the dosing tank and the disinfection tank. The manual valve is located above the solenoid valve, and the opening degree of the manual isolation valve is linearly related to the flow rate of the jet pump.
[0010] The beneficial effects are as follows: the medicine in the dosing tank enters the disinfection tank sequentially through a manual valve and a solenoid valve by gravity. The sewage in the disinfection tank is pumped from the regulating tank to the disinfection tank by a jet pump. Therefore, during the installation of the device, it is necessary to control the opening of the manual valve according to the flow rate of the jet pump. This is because the dosage of medicine required per unit volume of sewage during the disinfection process is within a specific range. The functional relationship between the flow rate of the jet pump and the manual valve is calculated based on the ratio of the medicine to the sewage volume. Based on this functional relationship, the manual valve and the flow rate of the jet pump are linearly linked to ensure that the ratio of the medicine in the dosing tank to the sewage entering the disinfection tank is exactly scientific.
[0011] Preferably, as an improvement, a water supply pipe is installed at the top of the medicine dispensing tank, and a water supply valve is installed on the water supply pipe.
[0012] Preferably, as an improvement, the treatment unit also includes a sludge tank connected to the equalization tank. A drain valve and a sludge pump are connected between the equalization tank and the sludge tank. The drain valve is used to send sludge from the sewage into the sludge tank, and then to the sludge station via the sludge pump. The sludge pump is electrically connected to the PLC control cabinet.
[0013] Preferably, as an improvement, the collection section includes a collection tank for collecting sewage, a grit chamber connected between the collection tank and the equalization tank, a sewage lift pump connected between the collection tank and the grit chamber, and the grit chamber being higher than the equalization tank.
[0014] The beneficial effects are as follows: domestic sewage is pumped from the collection tank to the grit chamber by a sewage lift pump. Large particles of impurities are deposited in the grit chamber, while the remaining sewage flows into the equalization tank by gravity. Since the grit chamber is higher than the equalization tank, the sewage can be discharged into the equalization tank by gravity, thereby reducing equipment investment and saving costs.
[0015] Preferably, as an improvement, a screen cleaning machine is installed at the inlet of the collection tank.
[0016] The beneficial effects are: the bar screen cleaner can intercept larger suspended and floating objects in sewage, such as sand, metal fragments, lees, and rice husks, preventing these substances from entering the subsequent treatment system, thereby protecting equipment such as water pumps, pipes, and instruments from blockage and damage.
[0017] Preferably, as an improvement, a self-priming pump is connected between the filter and the disinfection tank, and the self-priming pump is used to send water from the disinfection tank into the filter. Attached Figure Description
[0018] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the present utility model. Detailed Implementation
[0019] The following detailed description illustrates the specific implementation method:
[0020] The reference numerals in the accompanying drawings include: collection section 1, collection tank 11, bar screen cleaner 111, grit chamber 12, sewage lift pump 121, treatment section 2, equalization tank 21, disinfection tank 22, jet pump 23, dosing tank 24, manual isolation valve 241, solenoid valve 242, water supply pipe 243, water supply valve 244, sludge tank 25, sewage pump 251, filter 3, and self-priming pump 31.
[0021] Example
[0022] like Figure 1The illustrated domestic sewage treatment device includes a collection unit 1 for collecting domestic sewage. The collection unit 1 includes a collection tank 11 and a grit chamber 12 connected to the collection tank 11. The collection tank 11 and the grit chamber 12 are connected by a pipe. A sewage lift pump 121 is also installed between the collection tank 11 and the grit chamber 12. The sewage lift pump 121 is responsible for pumping the sewage from the collection tank 11 to the grit chamber 12. In addition, a bar screen cleaner 111 is installed at the inlet of the collection tank 11. The bar screen cleaner 111 initially removes and collects large floating objects such as leaves from the sewage. The collection unit 1 is connected to a treatment unit 2, which is used to further and thoroughly purify the sewage. The treatment unit 2 includes an equalization tank 21 and a biological treatment unit. The device, disinfection tank 22, and sludge tank 25, as well as the equalization tank 21 and grit chamber 12, are connected by pipes. The grit chamber 12 is placed vertically, and the pipe between the collection tank 11 and the grit chamber 12 is connected to the top of the grit chamber 12. The pipe between the equalization tank 21 and the grit chamber 12 is also connected to the top of the grit chamber 12. The top of the grit chamber 12 is higher than the top of the equalization tank 21. Wastewater flows naturally down from the top of the grit chamber 12 by gravity, and particulate impurities in the wastewater are deposited and filtered. The specific structure inside the grit chamber 12 is existing technology and will not be described in detail here. The filtered wastewater enters the equalization tank 21 from the grit chamber 12 through the pipe by gravity. The height setting between the grit chamber 12 and the equalization tank 21 reduces equipment investment and saves costs.
[0023] like Figure 1 As shown, the equalization tank 21 and disinfection tank 22, as well as the equalization tank 21 and sludge tank 25, are connected by pipes. A jet pump 23 is installed between the equalization tank 21 and disinfection tank 22. The wastewater treatment device also includes a PLC control cabinet. A liquid level electrode is fixedly installed on the inner wall of the equalization tank 21. Both the liquid level electrode and the jet pump 23 are electrically connected to the PLC control cabinet via circuitry. The liquid level electrode is an electrode-type liquid level sensor that determines the liquid level by detecting whether the liquid is in contact with the electrode. When the water level rises and contacts the electrode, a conductive path is formed between the electrodes, thereby generating a liquid level sensor. The control board receives these current signals and processes them by rectification, filtering, and amplification. Finally, it converts the liquid level signal into a standard electrical signal and outputs it to the PLC control cabinet. The PLC receives these signals through its own input module and converts them into digital signals for processing. The PLC control cabinet analyzes and judges the input electrical signals according to the preset control logic. The PLC outputs control commands based on the processed signals and drives the jet pump 23 to spray and pressurize through the output module, thereby pumping the sewage in the equalization tank 21 to the biological treatment device for treatment and then allowing it to flow by gravity into the disinfection tank 22.
[0024] like Figure 1As shown, a dosing tank 24 is installed above the disinfection tank 22. The dosing tank 24 is connected to the disinfection tank 22 via a pipe. From top to bottom, a manual valve 241 and a solenoid valve 242 are installed on the pipe between the dosing tank 24 and the disinfection tank 22. A water supply pipe 243 is installed at the top of the dosing tank 24, and a water supply valve 244 is installed on the water supply pipe 243. The dosing tank 24 is used to prepare disinfectant of a specific concentration. Since the amount of disinfectant required per unit volume of sewage during sewage disinfection is within a specific range, the functional relationship between the flow rate of the jet pump 23 and the required dosage of the prepared disinfectant is calculated based on the ratio of the disinfectant to the sewage volume. Then, the functional relationship between the flow rate of the disinfectant and the opening of the manual valve 241 is calculated. By using the value of the disinfectant flow rate, the sewage flow rate of the jet pump 23 and the opening of the manual diaphragm valve are correlated and the functional relationship is obtained, thereby ensuring that the ratio of the disinfectant added to the disinfection tank 22 by the dosing tank 24 to the sewage entering the disinfection tank 22 is exactly scientific.
[0025] like Figure 1 As shown, after adjusting the opening of the manual valve 241 according to the flow rate of the jet pump 23, the manual valve 241 remains open. Furthermore, the solenoid valve 242 is also electrically connected to the PLC control cabinet via a circuit. The output module of the PLC controlling the jet pump 23 is also connected to the solenoid valve 242. Therefore, when the PLC control cabinet outputs a command to the jet pump 23, it also outputs a command to the solenoid valve 242, causing the solenoid valve 242 to open when the jet pump 23 is running and close when the jet pump 23 stops running. In addition, the equalization tank 21 and the sludge tank 25 are also connected by a pipeline, and a sewage pump 25 is installed between the sludge tank 25 and the equalization tank 21. 1. The sewage pump 251 is used to pump the sludge in the equalization tank 21 to the sludge tank 25 for storage. The sewage treatment device also includes a filter 3. The output end of the filter 3 is used to supply water to domestic water. The input end of the filter 3 is also connected to the disinfection tank 22 through a pipe. A self-priming pump 31 is connected between the disinfection tank 22 and the filter 3. The self-priming pump 31 is also connected to the PLC control cabinet through an electrical circuit. After the PLC control cabinet outputs a command and stops the jet pump 23, it means that the sewage in the disinfection tank 22 has been disinfected. At this time, the PLC outputs a command to make the self-priming pump 31 run, thereby pumping the water in the disinfection tank 22 to the filter 3.
[0026] The above descriptions are merely embodiments of this utility model. Commonly known technical solutions and / or characteristics are not described in detail here. It should be noted that those skilled in the art can make various modifications and improvements without departing from the technical solution of this utility model. These modifications and improvements should also be considered within the scope of protection of this utility model, and will not affect the effectiveness of the implementation of this utility model or the practicality of the patent. The scope of protection claimed in this application should be determined by the content of its claims, and the specific embodiments described in the specification can be used to interpret the content of the claims.
Claims
1. A domestic sewage treatment device, characterized in that: The system includes a collection unit for collecting wastewater, a treatment unit connected to the collection unit, and a filter connected to the treatment unit. The treatment unit treats the wastewater from the collection unit and sends the water to domestic use through the filter. The treatment unit includes an equalization tank for solid-liquid separation of wastewater, a biological treatment device connected to the equalization tank, and a disinfection tank. A jet pump is connected between the equalization tank, the biological treatment device, and the disinfection tank. The jet pump is used to send the wastewater in the equalization tank to the treatment device for biological treatment, and then it flows by gravity to the disinfection tank. A dosing tank is connected to the disinfection tank. The dosing tank is used to store and deliver the dosing drugs to the disinfection tank. A manual valve and a solenoid valve are installed between the dosing tank and the disinfection tank. The treatment unit is equipped with a PLC control cabinet. The solenoid valve and the jet pump are electrically connected through the PLC control cabinet. The jet pump is turned on and off, and the solenoid valve is turned on and off synchronously through the PLC control cabinet.
2. The processing apparatus according to claim 1, characterized in that: The equalization tank is equipped with a liquid level electrode, which is electrically connected to the PLC control cabinet. When sewage touches the liquid level electrode, the PLC control cabinet controls the jet pump to spray and increase the pressure.
3. The processing apparatus according to claim 2, characterized in that: The height of the dosing tank is higher than that of the disinfection tank. A manual valve is also installed between the dosing tank and the disinfection tank. The manual valve is located above the solenoid valve, and the opening degree of the manual valve is linearly related to the flow rate of the jet pump.
4. The processing apparatus according to claim 3, characterized in that: The medicine dispensing box is equipped with a water supply pipe at the top, and the water supply pipe is equipped with a water supply valve.
5. The processing apparatus according to claim 1, characterized in that: The treatment unit also includes a sludge tank connected to the equalization tank. A drain valve and a sludge pump are connected between the equalization tank and the sludge tank. The drain valve is used to send sludge from the sewage into the sludge tank, and then the sludge is pumped to the sludge station. The drain pump is electrically connected to the PLC control cabinet.
6. The processing apparatus according to claim 1, characterized in that: The collection section includes a collection tank for collecting sewage, a grit chamber connected between the collection tank and the equalization tank, a sewage lift pump connected between the collection tank and the grit chamber, and the grit chamber being higher than the equalization tank.
7. The processing apparatus according to claim 6, characterized in that: A screen cleaning machine is installed at the inlet of the collection tank.
8. The processing apparatus according to claim 1, characterized in that: A self-priming pump is connected between the filter and the disinfection tank. The self-priming pump is used to send water from the disinfection tank into the filter.