Wastewater Treatment Systems and Methods

Abstract

This invention provides a wastewater treatment system and method, relating to the field of industrial wastewater discharge and treatment technology. The system includes: a main wastewater treatment station, wastewater collection pipelines, emergency water pipelines, and at least two drainage zones. Each drainage zone contains a wastewater collection tank, an emergency water tank, and a pretreatment unit, which is connected to both the wastewater collection tank and the emergency water tank. The main wastewater treatment station includes an equalization tank and a main emergency water tank, connected to each other. The equalization tank is equipped with online water quality monitoring equipment. The wastewater collection tank is connected to the equalization tank via a wastewater collection pipeline, and the emergency water tank is connected to the main emergency water tank via an emergency water pipeline. Both pipelines are equipped with electrically controlled valves. The wastewater treatment system provided by this invention, through real-time monitoring of wastewater quality, allows for monitoring of wastewater treatment status in each drainage zone, reducing the risk of unauthorized wastewater discharge by enterprises. It also possesses the capability for wastewater reprocessing, improving wastewater treatment efficiency, and features a simple pipeline structure for easy maintenance.

Description

Technical Field

[0001] This invention relates to the field of industrial wastewater discharge and treatment technology, and particularly to a wastewater treatment system and method. Background Technology

[0002] Industrial wastewater refers to various types of wastewater generated by enterprises during their production processes. Among them, wastewater with more serious pollution generally needs to be pre-treated within the enterprise to meet the standards for discharge into the municipal sewer system before being uniformly discharged to the main wastewater treatment plant in the industrial park for further treatment.

[0003] Currently, most industrial enterprises in China use buried gravity flow drainage for their wastewater discharge. This means that pre-treated wastewater from each drainage zone flows to the main sewage pipe of the industrial park, and then is uniformly discharged to a central wastewater treatment plant for further treatment. This method cannot monitor the volume and quality of the wastewater discharged from each drainage zone in real time. Unauthorized discharge of untreated wastewater by enterprises can create a significant impact load on the central wastewater treatment plant, thus affecting the wastewater treatment effect. Patent application number 201810556212.6 provides a wastewater collection system and method for industrial parks. The system includes a wastewater collection pond, a centralized wastewater collection pond, a centralized wastewater treatment pond, and a centralized wastewater storage pond. The wastewater collection pond is connected to six centralized wastewater collection ponds via six pipes, and the six centralized wastewater collection ponds are sequentially connected to six centralized wastewater treatment ponds. In this application, each drainage zone uses a separate pipeline and treatment system, resulting in numerous pipelines and treatment units, a complex system, high engineering and maintenance costs, and an inability to collect and treat accidental wastewater that does not meet quality standards. Summary of the Invention

[0004] To address the shortcomings of the existing technology, the present invention provides a wastewater treatment system and method, which solves the technical problems of existing wastewater treatment systems requiring independent management and treatment systems for each drainage zone and being unable to treat accidental wastewater.

[0005] The present invention provides a wastewater treatment system, comprising: a main wastewater treatment station, a wastewater collection pipeline, an emergency water pipeline, and at least two drainage zones;

[0006] The drainage zone is equipped with a wastewater collection tank, an emergency water tank, and a pretreatment unit. The pretreatment unit is connected to the wastewater collection tank and the emergency water tank, respectively.

[0007] The main wastewater treatment plant is equipped with an equalization tank and a main emergency water tank. The equalization tank is connected to the main emergency water tank, and the equalization tank is equipped with online water quality monitoring equipment.

[0008] The wastewater collection tank is connected to the regulating tank through the wastewater collection pipeline, and the emergency water tank is connected to the main emergency water tank through the emergency water pipeline. Both the wastewater collection pipeline and the emergency water pipeline are equipped with electrically controlled valves.

[0009] Wastewater from each drainage zone is treated by the pretreatment unit and then discharged into the wastewater collection tank. Based on the control of the electronically controlled valve, wastewater from each wastewater collection tank sequentially flows through the wastewater collection pipeline to the regulating tank. When the online water quality monitoring equipment detects that the wastewater in the regulating tank exceeds the standard, the wastewater in the regulating tank is discharged into the main emergency water tank. Then, based on the control of the electronically controlled valve, the wastewater in the main emergency water tank is discharged through the emergency water pipeline to the emergency water tank in the corresponding drainage zone, so as to utilize the pretreatment unit to treat the wastewater.

[0010] Optionally, the wastewater collection pipeline includes a wastewater collection main pipe and multiple wastewater collection branch pipes. One end of the wastewater collection main pipe is connected to the equalization tank, and the other end of the wastewater collection main pipe is connected to multiple wastewater collection branch pipes respectively. The multiple wastewater collection branch pipes are respectively connected to the wastewater collection tank in each of the drainage zones.

[0011] The emergency water pipeline includes an emergency water main pipe and multiple emergency water branch pipes. One end of the emergency water main pipe is connected to the main emergency water tank, and the other end of the emergency water main pipe is connected to multiple branch pipes of the main emergency water tank. The multiple branch pipes of the main emergency water tank are respectively connected to the emergency water tank in each of the drainage zones.

[0012] Optionally, each of the wastewater collection branch pipes is equipped with the electrically controlled valve, and the electrically controlled valve is also installed on the wastewater collection main pipe near each of the wastewater collection branch pipes. A wastewater flow meter is installed on the wastewater collection main pipe near the regulating tank.

[0013] Each of the aforementioned emergency water branch pipes is equipped with an electrically controlled valve, and the same electrically controlled valve is also installed on the emergency water main pipe near each of the aforementioned emergency water branch pipes. An emergency water flow meter is installed on the emergency water main pipe near the main emergency water tank.

[0014] Optionally, each of the wastewater collection tanks is equipped with a wastewater lift pump and a level gauge, and the wastewater lift pump is connected to the wastewater collection branch pipe corresponding to the wastewater collection tank.

[0015] An emergency water lift pump and a level gauge are installed in the main emergency water tank, and the emergency water lift pump is connected to the emergency water main pipe.

[0016] Optionally, the regulating pool includes a water intake channel and a regulating pool connected together, the water intake channel is also connected to the main emergency water pool, and the online water quality monitoring equipment is installed in the water intake channel.

[0017] Optionally, an electric gate is installed between the water intake channel and the main emergency water tank, and an electric gate is installed between the water intake channel and the regulating water tank.

[0018] Optionally, the total wastewater treatment station is also equipped with a total treatment unit and a control unit;

[0019] The main treatment unit is connected to the equalization tank and is connected to a discharge pipeline. When the online water quality monitoring equipment detects that the wastewater in the equalization tank meets the standards, the wastewater in the equalization tank is discharged to the main treatment unit for treatment, and the treated effluent is discharged or reused through the discharge pipeline.

[0020] The control unit is connected to the online water quality monitoring equipment, the electrically controlled valve, and all other electrical components in the wastewater treatment system.

[0021] Optionally, both the wastewater collection pipeline and the emergency water pipeline are pressure flow pipelines, which are installed by overhead laying along the cable tray or in underground pipe gallery / trench.

[0022] Optionally, the pretreatment unit is used to treat the wastewater in the drainage zone to meet the discharge standards.

[0023] The wastewater treatment system provided by this invention, by installing online water quality monitoring equipment in the equalization tank of the main wastewater treatment station, can remotely monitor the water quality of wastewater discharged from the wastewater collection tank to the equalization tank in real time, preventing the unauthorized discharge of wastewater that does not meet the discharge standards, thus avoiding a significant impact on the main wastewater treatment station and affecting the sewage treatment effect. Simultaneously, each drainage zone is equipped with an emergency water tank to receive wastewater that does not meet the discharge standards, and the wastewater undergoes secondary treatment through a pretreatment unit to meet the discharge standards, giving the system the ability to re-treat wastewater and providing strong fault tolerance. The wastewater collection tanks and emergency water tanks in each drainage zone are connected to the equalization tank and the main emergency water tank in the main wastewater treatment station through their respective independent pipelines, resulting in a simple structure that is easy to maintain and effectively saves costs. Electrically controlled valves installed on the pipelines allow the drainage zones to discharge sequentially according to a preset order, effectively understanding the wastewater treatment capacity and discharge status of each drainage zone, facilitating supervision and management. The above system effectively monitors the wastewater quality in real time, thereby reducing the occurrence of illegal discharge of wastewater by enterprises. The emergency water tank enables the system to re-treat wastewater, effectively improving the sewage treatment effect. Furthermore, the system has independent pipelines for each section, making it simple in structure and easy to maintain.

[0024] Another aspect of the present invention provides a wastewater treatment method, employing any of the wastewater treatment systems described above, comprising:

[0025] In the wastewater treatment system, the drainage zones to be drained are determined, and the preset drainage sequence of all drainage zones is obtained;

[0026] Based on the preset drainage sequence, a first drainage zone is determined, and the wastewater from the wastewater collection tank in the first drainage zone is discharged to the equalization tank in the main wastewater treatment station through the wastewater collection pipeline. The water quality of the wastewater in the equalization tank is monitored using online water quality monitoring equipment.

[0027] When the online water quality monitoring equipment detects that the wastewater in the equalization tank exceeds the standard, the wastewater in the equalization tank is discharged to the main emergency water tank, and the wastewater in the main emergency water tank is discharged to the emergency water tank in the first drainage zone through the emergency water pipeline.

[0028] Optionally, after discharging wastewater from the main emergency water tank to the emergency water tank in the first drainage zone via the emergency water pipeline, the method further includes:

[0029] Wastewater from the accident pool is discharged to a pretreatment unit for further treatment, and the treated wastewater is then discharged to a wastewater collection pool.

[0030] Wastewater from the wastewater collection pond is discharged into the equalization pond in the main wastewater treatment plant through the wastewater collection pipeline;

[0031] The wastewater in the equalization tank is monitored using online water quality monitoring equipment until the wastewater quality in the equalization tank meets the standards.

[0032] Optionally, after monitoring the wastewater in the equalization tank using online water quality monitoring equipment, the method further includes:

[0033] When the online water quality monitoring equipment detects that the wastewater quality in the equalization tank meets the standards, the wastewater in the equalization tank is discharged to the main treatment unit in the main wastewater treatment station for treatment, and the effluent obtained after treatment is discharged or reused through the discharge pipeline connected to the main treatment unit.

[0034] Optionally, discharging the wastewater from the wastewater collection tank in the first drainage zone to the equalization tank in the main wastewater treatment plant via a wastewater collection pipeline includes:

[0035] Open all electrically controlled valves on the wastewater collection branch pipe connected to the wastewater collection tank in the first drainage zone, as well as all electrically controlled valves on the wastewater collection main pipe, and close all other electrically controlled valves on the remaining wastewater collection branch pipes.

[0036] Turn on the wastewater lift pump in the wastewater collection tank in the first drainage zone, and discharge the wastewater in the wastewater collection tank into the equalization tank in the main wastewater treatment station through the wastewater collection branch pipe and the wastewater collection main pipe in sequence.

[0037] Optionally, the method further includes:

[0038] After completing the wastewater treatment process of the first drainage zone, based on the preset drainage sequence, the wastewater treatment process of the second drainage zone, the wastewater treatment process of the third drainage zone, and so on, is completed sequentially until the wastewater treatment process of all drainage zones to be drained in the wastewater treatment system is completed.

[0039] The wastewater treatment method provided in this application, based on a preset drainage sequence, enables the sequential discharge of wastewater in the drainage zones. It can effectively obtain the wastewater treatment status of each drainage zone, and if the wastewater quality does not meet the standards after treatment, the wastewater can be returned to the emergency water tank in the drainage zone for further treatment. This realizes the entire process of wastewater collection, monitoring and treatment, and effectively improves the sewage treatment effect.

[0040] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0041] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0042] Figure 1 A schematic diagram of the overall structure of an embodiment of the wastewater treatment system provided in this application;

[0043] Figure 2 This is a schematic flowchart of one embodiment of the wastewater treatment method provided in this application.

[0044] In the picture:

[0045] 1. Drainage zone; 11. Wastewater collection tank; 12. Emergency water tank; 13. Pretreatment unit; 14. Wastewater lift pump; 15. Level gauge;

[0046] 2. Main wastewater treatment plant; 21. Equalization tank; 201. Intake canal; 202. Equalization pool; 22. Main emergency water pool; 23. Online water quality monitoring equipment; 24. Emergency water lift pump; 25. Main treatment unit; 26. Control unit; 27. Electric gate;

[0047] 3. Wastewater collection pipeline; 31. Wastewater collection branch pipe; 32. Wastewater collection main pipe; 33. Electrically controlled valve; 34. Wastewater flow meter;

[0048] 4. Emergency water pipeline; 41. Emergency water main pipe; 42. Emergency water branch pipe; 43. Emergency water flow meter. Detailed Implementation

[0049] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0050] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0051] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0052] This invention provides a wastewater treatment system, such as... Figure 1As shown, it includes: a main wastewater treatment station 2, a wastewater collection pipeline 3, an emergency water pipeline 4, and at least two drainage zones 1; wherein, drainage zone 1 is equipped with a wastewater collection tank 11, an emergency water tank 12, and a pretreatment unit 13, the pretreatment unit 13 being connected to the wastewater collection tank 11 and the emergency water tank 12 respectively; the main wastewater treatment station 2 is equipped with an equalization tank 21 and a main emergency water tank 22, the equalization tank 21 being connected to the main emergency water tank 22, and the equalization tank 21 being equipped with an online water quality monitoring device 23; the wastewater collection tank 11 is connected to the equalization tank 21 through the wastewater collection pipeline 3, and the emergency water tank 12 is connected to the main emergency water tank 22 through the emergency water pipeline 4, the wastewater collection pipeline 3 being connected to the emergency water tank 22 through the emergency water pipeline 4, and the wastewater collection pipeline 3 being connected to the emergency water tank 22 through the emergency water pipeline 4, the wastewater collection pipeline 3 being connected to the emergency water tank 22 through the emergency water pipeline 3, and the emergency water tank 12 being connected to the main emergency water tank 22 through the emergency water pipeline 4, the wastewater collection pipeline 3 being connected to the emergency water tank 22 through the emergency water pipeline 3, and the emergency water tank 12 being connected to the main emergency water tank 22 through the emergency water pipeline 3, the wastewater collection pipeline 3 being connected to the ... the wastewater collection pipeline Both the pipeline 3 and the emergency water pipeline 4 are equipped with electrically controlled valves 33. Wastewater in each drainage zone 1 is treated by the pretreatment unit 13 and then discharged to the wastewater collection tank 11. Based on the control of the electrically controlled valves 33, the wastewater in each wastewater collection tank 11 is sequentially discharged to the regulating tank 21 through the wastewater collection pipeline 3. When the water quality online monitoring equipment 23 detects that the wastewater in the regulating tank 21 exceeds the standard, the wastewater in the regulating tank 21 is discharged to the total emergency water tank 22. Then, based on the control of the electrically controlled valves 33, the wastewater in the total emergency water tank 22 is discharged to the emergency water tank 12 in the corresponding drainage zone 1 through the emergency water pipeline 4, so that the pretreatment unit 13 can be used to treat the wastewater.

[0053] The wastewater treatment system provided by this invention, by installing an online water quality monitoring device 23 in the equalization tank 21 of the main wastewater treatment station 2, can remotely monitor the water quality of wastewater discharged from the wastewater collection tank 11 into the equalization tank 21 in real time, preventing the unauthorized discharge of wastewater that does not meet the discharge standards, which would cause a significant impact on the main wastewater treatment station 2 and affect the sewage treatment effect. At the same time, an emergency water tank 12 is set in each drainage zone 1 to receive wastewater that does not meet the discharge standards, and the wastewater is then treated again by the pretreatment unit 13 to meet the discharge standards, giving the system the ability to re-treat wastewater and strong fault tolerance. The wastewater collection tank 11 and the emergency water tank 12 in the drainage zone 1 are connected to the equalization tank 21 and the main emergency water tank 22 in the main wastewater treatment station 2 through their respective independent pipelines, which is simple in structure, easy to maintain, and effectively saves costs. The pipeline is equipped with an electrically controlled valve 33 so that the drainage zone 1 discharges one by one according to a preset sequence, which can effectively understand the wastewater treatment capacity and discharge status of each drainage zone 1, and facilitate supervision and management. The above system effectively monitors the wastewater quality in real time, thereby reducing the occurrence of illegal discharge of wastewater by enterprises. The emergency water tank 12 enables the system to re-treat wastewater, effectively improving the sewage treatment effect. Furthermore, the system has independent pipelines for each section, making it simple in structure and easy to maintain.

[0054] Specifically, in the above embodiments, the wastewater collection pipeline 3 includes a wastewater collection main pipe 32 and multiple wastewater collection branch pipes 31. One end of the wastewater collection main pipe 32 is connected to the equalization tank 21, and the other end of the wastewater collection main pipe 32 is connected to multiple wastewater collection branch pipes 31 respectively. The multiple wastewater collection branch pipes 31 are respectively connected to the wastewater collection pool 11 in each drainage zone 1. The emergency water pipeline 4 includes an emergency water main pipe 41 and multiple emergency water branch pipes 42. One end of the emergency water main pipe 41 is connected to the main emergency water pool 22, and the other end of the emergency water main pipe 41 is respectively connected to multiple main emergency water pool 22 branch pipes. The multiple main emergency water pool 22 branch pipes are respectively connected to the emergency water pool 12 in each drainage zone 1.

[0055] In this embodiment, the wastewater collection pipeline 3 and the emergency water pipeline 4 have the same structure, both adopting a form of one main pipe connected to multiple branch pipes. In the wastewater collection pipeline 3, each wastewater collection branch pipe 31 is connected to a wastewater collection tank 11 in a drainage zone 1. All wastewater collection branch pipes 31 converge and connect to the wastewater collection main pipe 32, which is ultimately connected to the regulating tank 21 in the main wastewater treatment station 2, so that the wastewater in the wastewater collection tank 11 in each drainage zone 1 can be effectively discharged into the regulating tank 21. The emergency water pipeline 4 is a loop in the opposite direction. The main emergency water tank 22 is connected to each emergency water branch pipe 42 through the emergency water main pipe 41. Each emergency water branch pipe 42 is connected to the emergency water tank 12 in the drainage zone 1, so that the wastewater in the main emergency water tank 22 can be discharged back to the emergency water tank 12 in the original drainage zone 1 for further treatment. In this application, each drainage zone 1 is equipped with its own independent wastewater collection branch pipe 31 and emergency water branch pipe 42. All branch pipes are eventually connected to the main wastewater treatment station 2 through the main pipe. On the one hand, the setting of branch pipes enables the system to distinguish and track the water in each drainage zone 1. On the other hand, the setting of the main pipe enables centralized monitoring and treatment of wastewater. The structure is simple, the cost is low and the availability is strong.

[0056] Furthermore, each wastewater collection branch pipe 31 is equipped with an electrically controlled valve 33, and an electrically controlled valve 33 is also installed on the wastewater collection main pipe 32 near each wastewater collection branch pipe 31. A wastewater flow meter 34 is installed on the wastewater collection main pipe 32 near the regulating tank 21. Each emergency water branch pipe 42 is equipped with an electrically controlled valve 33, and an electrically controlled valve 33 is also installed on the emergency water main pipe 41 near each emergency water branch pipe 42. An emergency water flow meter 43 is installed on the emergency water main pipe 41 near the main emergency water tank 22.

[0057] In this embodiment, the electrically controlled valve 33 is used to control the sequence of drainage and return water in each drainage zone 1. When a drainage zone 1 discharges wastewater to the main wastewater treatment station 2, or receives wastewater that does not meet the water quality standards as detected by the main wastewater treatment station 2, all electrically controlled valves 33 on the pipeline between this drainage zone 1 and the main wastewater treatment station 2 are opened, and other electrically controlled valves 33 are closed to prevent wastewater from flowing into other drainage zones 1 and affecting the monitoring and treatment effect. The specific configuration of the electrically controlled valve 33 is as follows: Figure 1 As shown, each wastewater collection branch pipe 31 and each emergency water branch pipe 42 is equipped with an electrically controlled valve 33 to control the wastewater discharge and reception of this drainage zone 1. The drainage zone 1 located at the farthest end is typically the first or last area to discharge wastewater, and electrically controlled valves 33 can be selectively installed on its branch pipes. Electrically controlled valves 33 can also be installed on the main pipe section connected to each branch pipe, specifically before the branch pipe of the next drainage zone 1, to provide double protection and prevent the failure of the electrically controlled valves 33 on the branch pipes from causing the wastewater discharge and reception to fail according to the preset sequence. Simultaneously, flow meters are connected to the wastewater collection main pipe 32 and the emergency water main pipe 41 near the main wastewater treatment station 2 to monitor the flow rate of wastewater flowing into and out of the main wastewater treatment station 2 and obtain flow information in a timely manner.

[0058] Specifically, in the above embodiments, each wastewater collection tank 11 is equipped with a wastewater lift pump 14 and a level gauge 15, and the wastewater lift pump 14 is connected to the wastewater collection branch pipe 31 corresponding to the wastewater collection tank 11; an emergency water lift pump 24 and a level gauge 15 are installed in the main emergency water tank 22, and the emergency water lift pump 24 is connected to the emergency water main pipe 41.

[0059] In this embodiment, since wastewater collection and drainage typically utilize gravity flow, and the pipes entering each pool are quite deep, it is necessary to lift the wastewater to the ground for subsequent treatment. The wastewater lifting device can employ a lift pump to provide sufficient energy to the wastewater. In this application, there are two stages requiring wastewater lifting. One stage involves discharging wastewater from the wastewater collection pool 11 within drainage zone 1 into the collection pool; therefore, a wastewater lift pump 14 is installed in each wastewater collection pool 11 to lift the wastewater. The other stage involves discharging substandard wastewater from the main emergency water pool 22 back to the emergency water pool 12 within each drainage zone 1; therefore, an emergency water lift pump 24 is installed in the main emergency water pool 22 to lift the wastewater. Simultaneously, level gauges 15 are installed in both the wastewater collection pool 11 and the main emergency water pool 22 to monitor the liquid level in real time, thereby enabling automatic control of the lift pumps.

[0060] Specifically, in the above embodiments, the regulating pool 21 includes a water intake channel 201 and a regulating pool 202 that are connected to each other. The water intake channel 201 is also connected to the main emergency pool 22. The online water quality monitoring device 23 is installed in the water intake channel 201.

[0061] In this embodiment, a water intake channel 201 is provided at the front end of the equalization tank 21, and the area other than the water intake channel 201 serves as the equalization pool 202. An online water quality monitoring device 23 is installed within the water intake channel 201. When the equalization tank 21 receives wastewater discharged from the wastewater collection pool 11, the wastewater first flows into the water intake channel 201. The online water quality monitoring device 23 monitors the water quality of the wastewater. If the water quality meets the standards, the wastewater can be directly processed further. If the water quality does not meet the standards, the water intake channel 201 is separated from the equalization pool 202, and the water intake channel 201 is connected to the main emergency pool 22. The wastewater in the water intake channel 201 that does not meet the standards is then discharged into the main emergency pool 22. The water intake channel 201 enables rapid monitoring of the wastewater discharged from the wastewater collection pool 11, allowing for immediate acquisition of water quality results and, based on the results, discharging the wastewater into its corresponding pool for further treatment.

[0062] Furthermore, an electric gate 27 is installed between the water intake channel 201 and the main emergency water tank 22, and an electric gate 27 is installed between the water intake channel 201 and the regulating water tank 202.

[0063] In this embodiment, electric gates 27 are installed between the intake channel 201 and both the main emergency water tank 22 and the regulating water tank 202. When the wastewater quality in the intake channel 201 is substandard, the electric gates 27 between the intake channel 201 and the regulating water tank 202 are closed to separate them. Then, the electric gates 27 between the intake channel 201 and the main emergency water tank 22 are opened to connect them, allowing the substandard wastewater in the intake channel 201 to be discharged into the main emergency water tank 22. The electric gates 27 are convenient to control and effectively serve as isolation barriers.

[0064] Specifically, in the above embodiment, the main wastewater treatment station 2 is also equipped with a main treatment unit 25 and a control unit 26; the main treatment unit 25 is connected to the equalization tank 21 and is connected to a discharge pipeline. When the online water quality monitoring device 23 detects that the wastewater in the equalization tank 21 meets the standards, the wastewater in the equalization tank 21 is discharged to the main treatment unit 25 for treatment, and the treated tailwater is discharged or reused through the discharge pipeline; the control unit 26 is connected to the online water quality monitoring device 23, the electric control valve 33 and all other electrical components in the wastewater treatment system.

[0065] In this embodiment, the main wastewater treatment station 2 is equipped with a main treatment unit 25. The main treatment unit 25 is used to perform the final treatment on the wastewater in the equalization tank 21 that meets the water quality standards. After treatment, effluent is obtained and discharged or reused through the discharge pipeline, completing the last link of wastewater treatment. At the same time, the main wastewater treatment station 2 is equipped with a control unit 26. Specifically, the control unit 26 is used to control the connection between the online water quality monitoring equipment 23 and the electric control valve 33 to realize the functions of monitoring water quality and controlling the discharge sequence of drainage zone 1. It is also used to control other electrical components in the system, such as level gauges, flow meters, and booster pumps, so as to achieve the effect of controlling all functions of drainage zone 1 with only one control unit 26, simplifying the structure and improving efficiency.

[0066] Specifically, in the above embodiments, both the wastewater collection pipeline 3 and the emergency water pipeline 4 are pressure flow pipelines, which are installed by overhead laying along the cable tray or in underground pipe gallery / trench.

[0067] In this embodiment, a pressure flow pipeline refers to an engineering pipeline in which the fluid medium inside the pipeline is made to flow by external force. In this application, its specific installation method can be to lay it overhead along the cable tray or to install it directly in the underground pipe gallery / trench. The specific installation method can be selected according to the actual site conditions, and it has a wide range of applications.

[0068] Specifically, in the above embodiments, the pretreatment unit 13 is used to treat the wastewater in the drainage zone 1 to meet the discharge standards.

[0069] In this embodiment, the standard used by the pretreatment unit 13 to treat the wastewater in the drainage zone 1 is the discharge standard, which usually refers to the "Water Quality Standard for Wastewater Discharge into Urban Sewerage Systems" GB / T31962-2015 or the Class III standard of the "Integrated Wastewater Discharge Standard". Specifically, it sets limits on the allowable discharge of pollutants and harmful factors in the wastewater. At the same time, the online water quality monitoring device 23 also monitors the water quality based on the discharge standard.

[0070] Another aspect of the present invention provides a wastewater treatment method, employing any of the above-mentioned wastewater treatment systems, such as... Figure 2As shown, the process includes: firstly, in the wastewater treatment system, determining the drainage zone 1 to be drained and obtaining the preset drainage sequence of all drainage zones 1; then, based on the preset drainage sequence, determining the first drainage zone; discharging the wastewater from the wastewater collection tank 11 in the first drainage zone to the equalization tank 21 in the main wastewater treatment station 2 through the wastewater collection pipeline 3; and using the online water quality monitoring device 23 to monitor the water quality of the wastewater in the equalization tank 21. When the online water quality monitoring device 23 detects that the water quality of the wastewater in the equalization tank 21 exceeds the standard, discharging the wastewater from the equalization tank 21 to the main emergency water tank 22, and discharging the wastewater from the main emergency water tank 22 to the emergency water tank 12 in the first drainage zone through the emergency water pipeline 4.

[0071] The wastewater treatment method provided in this application is based on a preset drainage sequence to achieve the sequential discharge of wastewater in drainage zone 1. It can effectively obtain the wastewater treatment status of each drainage zone 1, and if the wastewater quality does not meet the standards after treatment, the wastewater is returned to the emergency water tank 12 in drainage zone 1 for re-treatment. This realizes the whole process of wastewater collection, monitoring and treatment, and effectively improves the sewage treatment effect.

[0072] Furthermore, after discharging the wastewater from the main emergency water tank 22 to the emergency water tank 12 in the first drainage zone through the emergency water pipeline 4, the method further includes: firstly, discharging the wastewater from the emergency water tank 12 to the pretreatment unit 13 for retreatment, and then discharging the retreated wastewater to the wastewater collection tank 11. Then, discharging the wastewater from the wastewater collection tank 11 to the equalization tank 21 in the main wastewater treatment station 2 through the wastewater collection pipeline 3. Finally, using the online water quality monitoring equipment 23 to monitor the water quality of the wastewater in the equalization tank 21 until the water quality of the wastewater in the equalization tank 21 meets the standards.

[0073] In this embodiment, after substandard wastewater is discharged back to the emergency water tank 12 in the first drainage zone, it needs to be treated again to ensure that the wastewater quality meets the standards. The wastewater in the emergency water tank 12 is then discharged to the pretreatment unit 13 for further treatment. After treatment, the wastewater discharge process in the first drainage zone is repeated. The wastewater is discharged from the pretreatment unit 13 to the wastewater collection tank 11 and then to the equalization tank 21 in the main wastewater treatment station 2 for water quality monitoring. If the water quality meets the standards, subsequent treatment processes are carried out. If the water quality still does not meet the standards, the wastewater is discharged back to the emergency water tank 12 in the first drainage zone for further treatment until the wastewater discharged to the equalization tank 21 in the main wastewater treatment station 2 meets the standards. This application enables repeated treatment of substandard emergency wastewater, preventing the illegal discharge of substandard wastewater from causing a large impact load on the main wastewater treatment station 2, thereby affecting the wastewater treatment effect.

[0074] Furthermore, after monitoring the wastewater in the equalization tank 21 using the online water quality monitoring device 23, the method also includes: when the online water quality monitoring device 23 detects that the wastewater in the equalization tank 21 meets the standards, the wastewater in the equalization tank 21 is discharged to the main treatment unit 25 in the main wastewater treatment station 2 for treatment, and the treated effluent is discharged or reused through the discharge pipeline connected to the main treatment unit 25.

[0075] In this embodiment, once the online water quality monitoring device 23 detects that the wastewater quality in the equalization tank 21 meets the standards, it indicates that the wastewater treatment in the drainage zone 1 has been completed and can proceed with subsequent treatment. That is, the wastewater that meets the standards is discharged to the main treatment unit 25 in the main wastewater treatment station 2 for final treatment. The effluent obtained after final treatment is discharged or reused through the discharge pipeline connected to the main treatment unit 25, thus completing the entire wastewater treatment process.

[0076] Furthermore, the wastewater from the wastewater collection tank 11 in the first drainage zone is discharged to the equalization tank 21 in the main wastewater treatment station 2 through the wastewater collection pipe 3. This includes: firstly, opening all the electrically controlled valves 33 on the wastewater collection branch pipe 31 connected to the wastewater collection tank 11 in the first drainage zone, as well as all the electrically controlled valves 33 on the wastewater collection main pipe 32, and closing all the electrically controlled valves 33 on the remaining wastewater collection branch pipes 31; secondly, opening the wastewater lift pump 14 in the wastewater collection tank 11 in the first drainage zone, and discharging the wastewater from the wastewater collection tank 11 sequentially through the wastewater collection branch pipe 31 and the wastewater collection main pipe 32 to the equalization tank 21 in the main wastewater treatment station 2.

[0077] In this embodiment, each drainage zone 1 is equipped with an independent wastewater collection pipeline 3, mainly manifested in the wastewater collection branch pipe 31 connected to the wastewater collection tank 11 within the drainage zone 1. The drainage process of each drainage zone 1 involves opening the electrically controlled valve 33 on the wastewater collection branch pipe 31 and the electrically controlled valve 33 on the wastewater collection main pipe 32 connected to the drainage zone 1, and then closing the electrically controlled valve 33 on the wastewater collection branch pipes 31 connected to other drainage zones 1, thus forming a unique passage for drainage between the drainage zone 1 and the main wastewater treatment station 2. Similarly, when other drainage zones 1 discharge wastewater... The discharge process involves closing the electrically controlled valve 33 on the wastewater collection branch pipe 31 connected to other drainage zones 1, and then opening the electrically controlled valve 33 on the corresponding wastewater collection branch pipe 31 and the electrically controlled valve 33 on the wastewater collection main pipe 32 of the drainage zone 1 that should be drained. Each drainage zone 1 carries out the drainage process one by one without being disturbed by other drainage zones 1. Similarly, when the main wastewater treatment station 2 detects that the water quality in the regulating tank 21 does not meet the standards, the opening and closing state of the electrically controlled valve 33 during the process of discharging from the main emergency water tank 22 to the emergency water tank 12 in the corresponding drainage zone 1 is the same as the treatment process principle of the wastewater discharged from the drainage zone 1.

[0078] Furthermore, the method also includes: after completing the wastewater treatment process of the first drainage zone, based on the preset drainage sequence, sequentially completing the wastewater treatment process of the second drainage zone, the wastewater treatment process of the third drainage zone, ... until the wastewater treatment process of all drainage zones 1 to be drained in the wastewater treatment system is completed.

[0079] In this embodiment, in the wastewater treatment system, based on a preset drainage sequence, after the wastewater treatment process of the first drainage zone is completed, the second drainage zone, the third drainage zone, and so on are carried out one by one until the drainage process of all drainage zones 1 is completed. The drainage process of each drainage zone 1 and the treatment process of emergency water are carried out independently without affecting each other, ensuring that the wastewater treated by each drainage zone meets the quality requirements. The drainage process in the wastewater treatment system is simple and efficient.

[0080] An example of wastewater treatment using the wastewater treatment method provided in this application is as follows:

[0081] First, determine the drainage zones, drainage cycle, drainage duration of each drainage zone, and parameters of each device. Specifically, the drainage system in the entire area is divided into n drainage zones, with designed drainage volumes of Q1, Q2, ..., Qn for each zone. The drainage cycle is set to t. A wastewater lift pump is installed in the wastewater collection tank of each drainage zone, with a flow rate of q = (Q1 + Q2 + ... + Qn) / t. The head of the wastewater lift pump is calculated based on the lifting height and the head loss in the pipeline. The drainage duration of each drainage zone is ti = Qi / q.

[0082] Secondly, within a normal drainage cycle, wastewater from drainage zones is discharged into the wastewater collection pipeline in the order of zone n, n-1, ..., 2, 1, and then into the equalization tank of the main wastewater treatment plant. The drainage duration corresponding to zone n, n-1, ..., 2, 1 can be calculated based on the first step. Specifically, before drainage zone i, the solenoid valves on all wastewater collection branch pipes except wastewater collection branch pipe i, as well as the solenoid valve on the wastewater collection main pipe before the connection point between the wastewater collection branch pipe and the wastewater collection main pipe of drainage zone i, are closed. The solenoid valves on wastewater collection branch pipe i and the wastewater collection main pipe after the connection point between the wastewater collection branch pipe and the wastewater collection main pipe of drainage zone i are opened. Then, the wastewater lift pump in the wastewater collection tank of drainage zone i is turned on. After drainage duration ti, the wastewater lift pump is turned off, thus completing the drainage process of drainage zone i. Then, the drainage process of drainage zone i-1 is carried out, and so on.

[0083] When the main wastewater treatment plant detects that the wastewater in the equalization tank exceeds the standard through its online monitoring equipment, this wastewater is discharged into the main emergency water tank. It is then lifted by the emergency water lift pump installed in the main emergency water tank to the emergency water pipeline, and finally returned to the emergency water tank in the corresponding drainage zone. Specifically, assuming that when drainage zone i is draining, the online water quality monitoring equipment of the main wastewater treatment plant detects that the wastewater quality exceeds the standard, firstly, the water intake channel and the regulating pool in the regulating pool are isolated, which can be done by closing the electric gate between the water intake channel and the regulating pool. Then, the water intake channel is connected to the main emergency water pool, and the wastewater exceeding the standard is discharged into the main emergency water pool. After all the emergency wastewater has been discharged into the main emergency water pool, the electric control valves on all emergency water branch pipes except emergency water branch pipe i, as well as the electric control valve on the emergency water main pipe before the connection point of the emergency water branch pipe and the emergency water main pipe in drainage zone i, are closed. The electric control valves on the emergency water branch pipes in discharge zone i, as well as the electric control valve on the emergency water main pipe after the connection point of the emergency water branch pipe and the emergency water main pipe in discharge zone i, are opened. Finally, the emergency water lift pump installed in the main emergency water pool is turned on to discharge the emergency wastewater into the emergency water pool of drainage zone i.

[0084] This invention provides a wastewater treatment method. In one embodiment, wastewater is discharged from a chemical industrial park. The data is as follows:

[0085] The chemical industrial park is divided into five drainage zones, with a drainage cycle of 24 hours. Production wastewater from each zone is discharged continuously. The drainage volume of Zone 1 is 5400 m3 / d, with a drainage duration of 9.06 hours; the drainage volume of Zone 2 is 2600 m3 / d, with a drainage duration of 4.36 hours; the drainage volume of Zone 3 is 1000 m3 / d, with a drainage duration of 1.68 hours; the drainage volume of Zone 4 is 3300 m3 / d, with a drainage duration of 5.54 hours; and the drainage volume of Zone 5 is 2000 m3 / d, with a drainage duration of 24 hours. The total drainage volume is 14300 m3 / d.

[0086] This chemical industrial park discharges wastewater sequentially to the main wastewater treatment station in the order of drainage zones five, four, three, two, and one. The flow rate of the wastewater lift pumps installed in each drainage zone is q = 14300 / 24 ​​= 596 m3 / h, and the diameter of the wastewater collection pipeline is DN400.

[0087] Based on the wastewater treatment method provided by this invention, in another embodiment, wastewater from a non-ferrous metal processing park is discharged, and the data is as follows:

[0088] A non-ferrous metal processing park was divided into four drainage zones, with a drainage cycle of 24 hours. The production wastewater in each zone was continuously discharged. The drainage volume of Zone 1 was 330 m3 / d and the drainage time was 2.57 hours; the drainage volume of Zone 2 was 450 m3 / d and the drainage time was 3.51 hours; the drainage volume of Zone 3 was 1700 m3 / d and the drainage time was 13.25 hours; and the drainage volume of Zone 4 was 600 m3 / d and the drainage time was 4.68 hours. The total drainage volume was 3080 m3 / d.

[0089] This chemical industrial park discharges wastewater sequentially to the main wastewater treatment station in the order of drainage zones four, three, two, and one. The flow rate of the wastewater lift pumps installed in each drainage zone is q = 3080 / 24 = 128 m3 / h, and the diameter of the wastewater collection pipeline is DN200.

[0090] Obviously, those skilled in the art can make various modifications and variations to this invention without departing from its spirit and scope. Therefore, if these modifications and variations fall within the scope of the claims of this invention and their equivalents, this invention also intends to include these modifications and variations.

Claims

1. A wastewater treatment system, characterized in that, include: The main wastewater treatment plant (2), wastewater collection pipeline (3), emergency water pipeline (4) and at least two drainage zones (1); The drainage zone (1) is equipped with a wastewater collection tank (11), an emergency water tank (12) and a pretreatment unit (13), and the pretreatment unit (13) is connected to the wastewater collection tank (11) and the emergency water tank (12) respectively; The main wastewater treatment station (2) is equipped with an equalization tank (21) and a main emergency water tank (22). The equalization tank (21) is connected to the main emergency water tank (22). The equalization tank (21) is equipped with an online water quality monitoring device (23). The wastewater collection tank (11) is connected to the regulating tank (21) through the wastewater collection pipeline (3), and the emergency water tank (12) is connected to the main emergency water tank (22) through the emergency water pipeline (4). Both the wastewater collection pipeline (3) and the emergency water pipeline (4) are equipped with an electric control valve (33). Wastewater in each drainage zone (1) is treated by the pretreatment unit (13) and then discharged into the wastewater collection tank (11). Based on the control of the electric valve (33), the wastewater in each wastewater collection tank (11) is sequentially discharged into the regulating tank (21) through the wastewater collection pipeline (3). When the water quality online monitoring device (23) detects that the wastewater in the regulating tank (21) exceeds the standard, the wastewater in the regulating tank (21) is discharged into the total emergency water tank (22). Based on the control of the electric valve (33), the wastewater in the total emergency water tank (22) is discharged into the emergency water tank (12) in the corresponding drainage zone (1) through the emergency water pipeline (4) so ​​that the wastewater can be treated by the pretreatment unit (13). The main wastewater treatment station (2) is also equipped with a main treatment unit (25) and a control unit (26); The main treatment unit (25) is connected to the regulating tank (21). The main treatment unit (25) is connected to a discharge pipeline. When the online water quality monitoring device (23) detects that the wastewater in the regulating tank (21) meets the standards, the wastewater in the regulating tank (21) is discharged to the main treatment unit (25) for treatment, and the treated tailwater is discharged or reused through the discharge pipeline. The control unit (26) is connected to the online water quality monitoring device (23), the electrically controlled valve (33), and all other electrical components in the wastewater treatment system; The pretreatment unit (13) is used to treat the wastewater in the drainage zone (1) to meet the discharge standards.

2. The wastewater treatment system according to claim 1, characterized in that, The wastewater collection pipeline (3) includes a wastewater collection main pipe (32) and multiple wastewater collection branch pipes (31). One end of the wastewater collection main pipe (32) is connected to the regulating tank (21), and the other end of the wastewater collection main pipe (32) is connected to multiple wastewater collection branch pipes (31). The multiple wastewater collection branch pipes (31) are respectively connected to the wastewater collection tank (11) in each of the drainage zones (1). The emergency water pipeline (4) includes an emergency water main pipe (41) and multiple emergency water branch pipes (42). One end of the emergency water main pipe (41) is connected to the main emergency water tank (22), and the other end of the emergency water main pipe (41) is connected to multiple branch pipes of the main emergency water tank (22). The multiple branch pipes of the main emergency water tank (22) are respectively connected to the emergency water tank (12) in each of the drainage zones (1).

3. The wastewater treatment system according to claim 2, characterized in that, Each of the wastewater collection branch pipes (31) is equipped with an electric control valve (33), and the same electric control valve (33) is also installed on the wastewater collection main pipe (32) near each of the wastewater collection branch pipes (31). A wastewater flow meter (34) is installed on the wastewater collection main pipe (32) near the regulating tank (21). Each of the aforementioned emergency water branch pipes (42) is equipped with an electric control valve (33), and the same electric control valve (33) is also installed on the emergency water main pipe (41) near each of the aforementioned emergency water branch pipes (42). An emergency water flow meter (43) is installed on the emergency water main pipe (41) near the total emergency water tank (22).

4. The wastewater treatment system according to claim 2, characterized in that, Each of the wastewater collection tanks (11) is equipped with a wastewater lift pump (14) and a level gauge (15), and the wastewater lift pump (14) is connected to the wastewater collection branch pipe (31) corresponding to the wastewater collection tank (11). An emergency water lift pump (24) and a level gauge (15) are installed in the main emergency water tank (22), and the emergency water lift pump (24) is connected to the emergency water main pipe (41).

5. The wastewater treatment system according to claim 1, characterized in that, The regulating pool (21) includes a water intake channel (201) and a regulating pool (202) that are connected to each other. The water intake channel (201) is also connected to the main emergency pool (22). The online water quality monitoring device (23) is installed in the water intake channel (201).

6. The wastewater treatment system according to claim 5, characterized in that, An electric gate (27) is provided between the water intake channel (201) and the main emergency water tank (22), and an electric gate (27) is provided between the water intake channel (201) and the regulating water tank (202).

7. The wastewater treatment system according to claim 1, characterized in that, Both the wastewater collection pipeline (3) and the emergency water pipeline (4) are pressure flow pipelines, which are installed by overhead laying along the cable tray or in underground pipe gallery / trench.

8. A wastewater treatment method, employing the wastewater treatment system as described in any one of claims 1 to 7, characterized in that, include: In the wastewater treatment system, the drainage zones to be drained are determined, and the preset drainage sequence of all drainage zones is obtained; Based on the preset drainage sequence, a first drainage zone is determined, and the wastewater from the wastewater collection tank in the first drainage zone is discharged to the equalization tank in the main wastewater treatment station through the wastewater collection pipeline. The water quality of the wastewater in the equalization tank is monitored using online water quality monitoring equipment. When the online water quality monitoring equipment detects that the wastewater in the equalization tank exceeds the standard, the wastewater in the equalization tank is discharged to the main emergency water tank, and the wastewater in the main emergency water tank is discharged to the emergency water tank in the first drainage zone through the emergency water pipeline.

9. The wastewater treatment method according to claim 8, characterized in that, After discharging wastewater from the main emergency water tank to the emergency water tank in the first drainage zone via the emergency water pipeline, the method further includes: Wastewater from the accident pool is discharged to a pretreatment unit for further treatment, and the treated wastewater is then discharged to a wastewater collection pool. Wastewater from the wastewater collection pond is discharged into the equalization pond in the main wastewater treatment plant through the wastewater collection pipeline; The wastewater in the equalization tank is monitored using online water quality monitoring equipment until the wastewater quality in the equalization tank meets the standards.

10. The wastewater treatment method according to claim 8, characterized in that, After monitoring the wastewater in the equalization tank using online water quality monitoring equipment, the method further includes: When the online water quality monitoring equipment detects that the wastewater quality in the equalization tank meets the standards, the wastewater in the equalization tank is discharged to the main treatment unit in the main wastewater treatment station for treatment, and the effluent obtained after treatment is discharged or reused through the discharge pipeline connected to the main treatment unit.

11. The wastewater treatment method according to claim 8, characterized in that, The step of discharging wastewater from the wastewater collection tank in the first drainage zone to the equalization tank in the main wastewater treatment plant through a wastewater collection pipeline includes: Open all electrically controlled valves on the wastewater collection branch pipe connected to the wastewater collection tank in the first drainage zone, as well as all electrically controlled valves on the wastewater collection main pipe, and close all other electrically controlled valves on the remaining wastewater collection branch pipes. Turn on the wastewater lift pump in the wastewater collection tank in the first drainage zone, and discharge the wastewater in the wastewater collection tank into the equalization tank in the main wastewater treatment station through the wastewater collection branch pipe and the wastewater collection main pipe in sequence.

12. The wastewater treatment method according to claim 8, characterized in that, The method further includes: After completing the wastewater treatment process of the first drainage zone, based on the preset drainage sequence, the wastewater treatment process of the second drainage zone and the third drainage zone are completed sequentially until the wastewater treatment process of all drainage zones to be drained in the wastewater treatment system is completed.

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