Process method and system for improving quality and efficiency by using recycled water

Abstract

The invention relates to the technical field of recycled water utilization, in particular to a recycled water utilization quality and efficiency improving process method which comprises the following steps: step 1, tail water is directionally introduced into a water inlet channel of a low-water-head water-turbine generator set; secondly, a low-water-head water-turbine generator set is installed at the tail end of the directional drainage channel, and a water turbine of the low-water-head water-turbine generator set is driven by tail water to drive a generator to generate electricity; thirdly, electric energy is provided for the water delivery pump station; the intelligent dispatching system is introduced, kinetic energy and potential energy contained in tail water are converted into green electric energy by scientifically dispatching the tail water discharging path and discharging amount on the basis that normal operation of an original tail water conveying and discharging system of the sewage treatment plant is not affected, and the green electric energy is applied to operation of the sewage treatment plant and conveying of recycled water; regional energy self-circulation is achieved, quality and efficiency improvement of recycled water utilization is achieved, the problem of recycled water utilization energy consumption is solved, the recycled water utilization proportion is increased, and reasonable allocation of urban water resources is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of recycled water utilization, and in particular to a process method and system for improving the quality and efficiency of recycled water utilization. Background Art

[0002] With the acceleration of urbanization and the expansion of industrial production, wastewater discharge has increased year by year, bringing tremendous pressure to the environment. Various types of wastewater such as industrial wastewater, domestic sewage, agricultural irrigation wastewater, etc. contain a large amount of chemicals, pathogens, organic matter, etc. Direct discharge into water bodies will cause water pollution, endanger aquatic life, and threaten human drinking water safety.

[0003] The traditional direct discharge of tail water from sewage treatment plants not only causes waste of water resources, but the pollutants carried in the tail water may cause secondary pollution to the environment. At the same time, the tail water from sewage treatment plants contains a large amount of kinetic energy and potential energy during the transportation and discharge process, and this part of energy has not been reasonably developed and utilized in the current water plant technology.

[0004] Therefore, in order to address the problems that the direct discharge of tail water causes waste of water resources and secondary pollution to the environment, and that the tail water contains a large amount of kinetic energy and potential energy that is not reasonably utilized during the transportation and discharge process, a process method and system for improving the quality and efficiency of recycled water utilization can be designed. Summary of the invention

[0005] In order to overcome the problem that direct discharge of tail water causes waste of water resources and secondary pollution to the environment, and that tail water contains a large amount of kinetic energy and potential energy during the transportation and discharge process that is not properly managed.

[0006] The technical solution of the present invention is: a process for improving the quality and efficiency of recycled water utilization, the steps of which are as follows:

[0007] Step 1: By setting a directional diversion channel at the bottom of the tailwater conveyance channel of the sewage treatment plant, the tailwater is directed into the water inlet channel of the low-head turbine generator set, creating conditions for the collection and conversion of kinetic energy and potential energy in the tailwater;

[0008] Step 2: A low-head turbine generator set is installed at the end of the directional diversion channel. The tailwater drives the turbine of the low-head turbine generator set to drive the generator to generate electricity, converting the kinetic energy and potential energy contained in the tailwater into green electricity;

[0009] Step 3: Use the generated green electricity to power the water pumping station.

[0010] A system for improving the quality and efficiency of recycled water utilization, comprising the process for improving the quality and efficiency of recycled water utilization as described above, including a tailwater water delivery channel, a directional diversion channel, a low-head turbine generator set, an electric energy storage and delivery system, a water delivery pump station and an intelligent dispatching system arranged in sequence;

[0011] The directional drainage channel is arranged below the bottom plate of the tailwater conveying channel. The bottom plate of the tailwater conveying channel has a square opening, which is connected to the directional drainage channel through a square bucket-shaped structure. The directional drainage channel is arranged along the tailwater conveying channel with a slope, and is used to convey the tailwater to the low-head turbine generator set through the directional drainage channel.

[0012] The low-head hydro-generator set consists of a turbine, bearings and a generator. The turbine is subjected to the impact of high-speed water flow transported by the directional diversion channel. The turbine rotates to drive the generator to rotate. After the generator is excited, the generator establishes voltage and starts to send electricity to the power storage and transmission system after the circuit breaker is put into operation.

[0013] The electric energy storage and transmission system stores or transmits the electric energy generated by the generator to the power consumption area, and converts the energy contained in the tailwater transmission process into green electric energy, which is used to drive the operation of the water transmission pump station;

[0014] The water transfer pump station is used to transport recycled water to water demand areas;

[0015] The smart dispatching system includes a device layer for data collection, an edge computing control layer, and a cloud management layer;

[0016] The equipment layer includes a flow meter A installed at the tailwater outlet of the sewage treatment plant, a flow meter B installed at the front end of the directional diversion channel, an electric gate valve installed at the cross section of the tailwater conveyance channel, and a pressure regulating valve installed at the front end of the directional diversion channel. The electric gate valve is used for water storage and water retention and tailwater delivery regulation, and the pressure regulating valve is used to adjust the water flow pressure;

[0017] The edge computing control layer includes a gate valve control module and a data processor. The data processor is used to receive the tailwater water volume transmitted by the equipment layer, combine it with the power of the selected turbine generator, generate the corresponding processing signal, and send the processing signal to the cloud management layer of the smart dispatching system;

[0018] The cloud management layer includes a cloud processor and a communication module. The communication module is used to receive processing signals sent by the edge computing control layer. The cloud processor generates command information based on the processing signals and sends the command information to the gate valve control module of the edge computing control layer to control each device to operate in a pre-set emergency mode.

[0019] Preferably, the length of the directional diversion channel should be ≥2m from the horizontal plane of the tailwater inlet of the upstream sewage treatment plant to the inlet of the low-head turbine generator set at the rear end of the directional diversion channel, and adjusted according to site conditions.

[0020] Preferably, the directional drainage channel is made of a pressure steel pipe with polyethylene coated on the inner wall.

[0021] As a preference, the power of the low-head hydraulic generator set should be miniaturized, with the preferred power P < 50KW. The total power of the low-head hydraulic generator set to be installed is comprehensively calculated based on the operating conditions of the sewage treatment plant's tailwater transportation, the scale of the water plant, the tailwater discharge, the site elevation and other variables. In accordance with the design principle of miniaturization of the low-head hydraulic generator set, the number of hydraulic generator sets to be installed is calculated. The vertical height from the horizontal plane of the upstream water inlet to the turbine inlet for the low-head hydraulic generator set to meet its operating conditions is ≥ 2m.

[0022] As a preferred method, the formula for calculating the total power of the low-head turbine generator set to be installed is: P = ρ × g × h × Q × η, where P is power in Kw, ρ is the density of recycled water, and g is the acceleration of gravity, which is 9.8 m / s 2 , h is the height difference, Q is the power generation flow, unit is m 3 / s, η is the efficiency coefficient, which is 0.9~0.98.

[0023] Preferably, flow meter A at the tailwater outlet of the sewage treatment plant is used to collect the tailwater flow of the sewage treatment plant, and analyze the real-time stability and urgency of the tailwater discharge according to the daily flow of the sewage treatment plant; flow meter B is used to collect the amount of tailwater diverted to the power generation channel, and analyze and control the lifting height of the electric gate valve set in the tailwater diversion channel section according to the power of the selected low-head turbine generator set and the water volume data collected by flow meter B.

[0024] As a preferred embodiment, the normal and emergency modes refer to the normal mode and the emergency mode. The normal mode corresponds to the stable discharge state of the daily tailwater of the sewage treatment plant, and the emergency mode corresponds to the state where the tailwater discharge of the sewage treatment plant increases or decreases dramatically due to external conditions. The normal mode refers to the stable output of the tailwater of the sewage treatment plant, and the energy contained in the tailwater transportation process matches the power model of the set low-head turbine generator set. The emergency mode refers to the excessive output of tailwater from the sewage treatment plant due to heavy rain or other emergencies. At this time, the emergency operation mode is activated, and the signal transmission of the intelligent dispatching system automatically lowers the electric gate valve to an appropriate position, so that the excess tailwater is discharged through the tailwater diversion channel. While ensuring the normal operation of the low-head turbine generator set, the healthy operation of the tailwater discharge system of the sewage treatment plant is ensured.

[0025] The beneficial effects of the present invention include: introducing an intelligent dispatching system, through intelligent dispatching of flow monitoring equipment, electric gate valves, automatic control systems of low-head turbine generator sets, etc., to realize the conversion of kinetic energy and potential energy contained in tail water into green electric energy without affecting the normal operation of the tail water transmission and discharge system of the original sewage treatment plant by scientifically dispatching the tail water discharge path and discharge volume, and applying the green electric energy to the operation of the sewage treatment plant and the transportation of recycled water, realizing regional energy self-circulation, and further realizing the improvement of the quality and efficiency of recycled water utilization, and introducing tail water into the water inlet channel of the low-head turbine generator set in a direction, creating conditions for the collection and conversion of kinetic energy and potential energy in tail water, driving the turbine to drive the generator to generate electricity through the tail water, realizing the conversion of kinetic energy and potential energy contained in tail water into green electric energy, providing electric energy for the recycled water transportation pump station, solving the problem of energy consumption in recycled water utilization, increasing the proportion of recycled water utilization, and realizing the reasonable allocation of urban water resources. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 Shown is a schematic diagram of the system structure for improving the quality and efficiency of recycled water utilization of the present invention;

[0027] Figure 2 Shown is a schematic diagram of the framework structure of the intelligent scheduling system in the system for improving the quality and efficiency of recycled water utilization of the present invention.

[0028] Explanation of the accompanying drawings: 1. Sewage treatment plant; 2. Tailwater water diversion channel; 3. Directional diversion channel; 4. Low-head hydro-generator set; 5. Electric energy storage and transmission system; 6. Water diversion pump station; 7. Electric gate valve; 8. Pressure regulating valve; 9. Flow meter A; 10. Flow meter B. DETAILED DESCRIPTION

[0029] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0030] See also Figure 1-Figure 2 The present invention provides an embodiment: a process for improving the quality and efficiency of recycled water utilization, the steps of which are as follows:

[0031] Step 1: by setting a directional diversion channel 3 at the bottom of the tailwater conveying channel 2 of the sewage treatment plant 1, the tailwater is directed into the water inlet channel of the low-head turbine generator set 4, creating conditions for the collection and conversion of kinetic energy and potential energy in the tailwater;

[0032] Step 2: A low-head hydro-generator set 4 is installed at the end of the directional diversion channel 3, and the water turbine of the low-head hydro-generator set 4 is driven by the tailwater to drive the generator to generate electricity, thereby converting the kinetic energy and potential energy contained in the tailwater into green electricity;

[0033] Step 3: Use the generated green electricity to provide electricity to the water pump station 6.

[0034] A system for improving the quality and efficiency of recycled water utilization, comprising the process for improving the quality and efficiency of recycled water utilization as described above, including a tailwater water delivery channel 2, a directional diversion channel 3, a low-head turbine generator set 4, an electric energy storage and delivery system 5, a water delivery pump station 6 and an intelligent dispatching system arranged in sequence;

[0035] The directional drainage channel 3 is arranged below the bottom plate of the tailwater conveying channel 2. The bottom plate of the tailwater conveying channel 2 has a square opening, which is connected to the directional drainage channel 3 through a square bucket-shaped structure. The directional drainage channel 3 is arranged along the tailwater conveying channel 2 with a slope, and is used to convey the tailwater to the low-head turbine generator set 4 through the directional drainage channel 3.

[0036] The low-head hydro-generator set 4 is composed of a turbine, a bearing and a generator. The turbine receives the impact of the high-speed water flow delivered by the directional diversion channel 3. The turbine rotates to drive the generator to rotate. After the generator is excited, the generator establishes voltage and starts to deliver electricity to the electric energy storage and transmission system 5 after the circuit breaker is put into operation.

[0037] The electric energy storage and transmission system 5 stores or transmits the electric energy generated by the generator to the power consumption area, and converts the energy contained in the tailwater transmission process into green electric energy, which is used to drive the water transmission pump station 6 to operate;

[0038] The water delivery pump station 6 is used to deliver the recycled water to the water demanding area;

[0039] The smart dispatching system includes a device layer for data collection, an edge computing control layer, and a cloud management layer;

[0040] The equipment layer includes a flow meter A9 arranged at the tailwater outlet of the sewage treatment plant, a flow meter B10 arranged at the front end of the directional diversion channel 3, an electric gate valve 7 arranged at the cross section of the tailwater water delivery channel 2, and a pressure regulating valve 8 arranged at the front end of the directional diversion channel 3. The electric gate valve 7 is used for water storage and water retention and tailwater delivery regulation, and the pressure regulating valve 8 is used for adjusting the water flow pressure;

[0041] The edge computing control layer includes a gate valve control module and a data processor. The data processor is used to receive the tailwater water volume transmitted by the equipment layer, combine it with the power of the selected turbine generator, generate the corresponding processing signal, and send the processing signal to the cloud management layer of the smart dispatching system;

[0042] The cloud management layer includes a cloud processor and a communication module. The communication module is used to receive processing signals sent by the edge computing control layer. The cloud processor generates command information based on the processing signals and sends the command information to the gate valve control module of the edge computing control layer to control each device to operate in a pre-set emergency mode.

[0043] Preferably, the length of the directional drainage channel 3 is preferably ≥2m from the horizontal plane of the tailwater inlet of the upstream sewage treatment plant 1 to the inlet of the low-head turbine generator set 4 at the rear end of the directional drainage channel 3, and is adjusted according to site conditions.

[0044] Preferably, the directional drainage channel 3 is made of a pressure steel pipe, and the inner wall is coated with polyethylene.

[0045] Preferably, the power of the low-head hydraulic generator set 4 is miniaturized, and the preferred power P is less than 50KW. The total power of the low-head hydraulic generator set 4 to be installed is comprehensively calculated based on the working conditions of the tailwater transportation of the sewage treatment plant 1, the scale of the water plant, the tailwater discharge, the site elevation and other variables. In accordance with the design principle of miniaturization of the low-head hydraulic generator set 4, the number of hydraulic generator sets to be installed is calculated. The vertical height from the horizontal plane of the upstream water inlet to the turbine inlet of the low-head hydraulic generator set 4 that meets its operating conditions is ≥2m.

[0046] As a preferred method, the formula for calculating the total power of the low-head turbine generator set 4 to be installed is: P = ρ × g × h × Q × η, where P is power in Kw, ρ is the density of recycled water, and g is the acceleration of gravity, which is 9.8 m / s 2 , h is the height difference, Q is the power generation flow, unit is m 3 / s, η is the efficiency coefficient, which is 0.9~0.98.

[0047] Preferably, the flow meter A9 at the tail water outlet of the sewage treatment plant 1 is used to collect the tail water flow of the sewage treatment plant 1, and analyze the real-time stability and urgency of the tail water discharge according to the daily flow of the sewage treatment plant 1; the flow meter B10 is used to collect the amount of tail water diverted to the power generation channel, and analyze and control the lifting height of the electric gate valve 7 set in the section of the tail water diversion channel 2 according to the power of the optional low-head turbine generator set 4 and the water volume data collected by the flow meter B10.

[0048] As a preferred embodiment, the normal and emergency modes refer to the normal mode and the emergency mode. The normal mode corresponds to the stable daily tailwater discharge state of the sewage treatment plant 1, and the emergency mode corresponds to the state in which the tailwater discharge of the sewage treatment plant 1 increases or decreases dramatically due to external conditions. The normal mode refers to the stable output of tailwater from the sewage treatment plant 1, and the energy contained in the tailwater transportation process matches the power model of the set low-head turbine generator set 4. The emergency mode refers to the excessive output of tailwater from the sewage treatment plant 1 under the influence of heavy rain or other emergencies. At this time, the emergency operation mode is activated, and the signal transmission of the intelligent dispatching system automatically lowers the electric gate valve 7 to an appropriate position, so that the excess tailwater is discharged through the tailwater transfer channel 2. While ensuring the normal operation of the low-head turbine generator set 4, the healthy operation of the tailwater discharge system of the sewage treatment plant 1 is ensured.

[0049] Example 1

[0050] With a daily processing capacity of 100,000 m 3 Take sewage treatment plant 1 as an example, the water volume corresponding to the normal and emergency modes is set as follows: Normal operation mode tailwater discharge volume 100,000 m 3 / d±10%, the tailwater discharge in emergency operation mode is 100,000m 3 / d outside the range of ±10%, especially 100,000 m 3 / d+10%, when the tailwater discharge is in a normal state, the flow meter A9 installed at the tailwater outlet of the sewage treatment plant 1 transmits the tailwater flow data to the edge computing control layer in the smart scheduling system. The edge computing control layer comprehensively analyzes and processes the on-site equipment collection indicators and the system pre-designed numerical values, generates a processing signal and sends it to the cloud management layer. The cloud management layer sends the command information to the gate valve control module of the edge computing control layer according to the system set program. The control module transmits the control signal to adjust the lifting height of the electric gate valve 7 so that the tailwater volume entering the directional drainage channel 3 matches the demand of the normal operating mode. The smart scheduling system automatically adjusts the operating parameters of each component unit of the system according to the water volume data collected by the equipment layer, and executes the normal operating mode.

[0051] In this mode, the power of low-head turbine generator set 4 is based on the formula: P = ρ × g × h × Q × η, with a daily processing capacity of 100,000 m 3 Taking sewage treatment plant 1 as an example, ρ is taken as 1 and g is taken as 9.8 m / s 2 , h is 2m, Q is 0.8m 3 / s, η is 0.9:

[0052] P=1×9.8×2×0.8×0.9=14.11Kw, that is, about 338.64 degrees of green electricity can be generated every day for the operation of sewage treatment plant 1 and the improvement of the quality and efficiency of recycled water utilization.

[0053] Example 2

[0054] With a daily processing capacity of 100,000 m 3 Take sewage treatment plant 1 as an example, the water volume corresponding to the normal and emergency modes is set as follows: Normal operation mode tailwater discharge volume 100,000 m 3 / d±10%, the tailwater discharge in emergency operation mode is 100,000m 3 / d outside the range of ±10%, especially 100,000 m 3 / d+10%; when the tailwater discharge exceeds 100,000 m 3When / d+10%, the flow meter A9 installed at the tailwater outlet of the sewage treatment plant 1 and the flow meter B10 installed at the front end of the directional drainage channel 3 transmit the tailwater flow data to the edge computing control layer in the smart scheduling system. The edge computing control layer comprehensively analyzes and processes the indicators collected by the on-site equipment and the pre-designed numerical values ​​of the system, generates a processing signal and sends it to the cloud management layer. The cloud management layer sends the instruction information to the gate valve control module of the edge computing control layer according to the program set by the system; the control module transmits the control signal to adjust the lifting height of the electric gate valve 7, so that the tailwater volume entering the directional drainage channel 3 matches the demand of the normal operating mode, and the excess part is discharged to the rear tailwater water delivery channel 2 through the electric gate valve 7 lowered to a certain position, so as to ensure the safety of tailwater discharge and the normal operation of the low-head turbine generator set 4. The smart scheduling system automatically adjusts the operating parameters of each component unit of the system according to the water volume data collected by the equipment layer, and executes the emergency operation mode.

[0055] Through the above steps, an intelligent scheduling system is introduced. On the basis of not affecting the normal operation of the tailwater transmission and discharge system of the original sewage treatment plant, the kinetic energy and potential energy contained in the tailwater are converted into green electricity by scientifically scheduling the tailwater discharge path and discharge volume, and the green electricity is applied to the operation of the sewage treatment plant and the transportation of recycled water, so as to realize regional energy self-circulation, and then realize the improvement of the quality and efficiency of recycled water utilization, and the tailwater is directionally introduced into the water inlet channel of the low-head turbine generator set 4 to create conditions for the collection and conversion of kinetic energy and potential energy in the tailwater. The tailwater drives the turbine to drive the generator to generate electricity, so as to realize the conversion of kinetic energy and potential energy contained in the tailwater into green electricity, provide electricity for the recycled water transmission pump station, solve the problem of energy consumption in the use of recycled water, increase the utilization ratio of recycled water, and realize the reasonable allocation of urban water resources to solve the waste of water resources caused by direct discharge of tailwater, and cause secondary pollution to the environment, and the problem that a large amount of kinetic energy and potential energy contained in the tailwater during transportation and discharge is not reasonably used.

[0056] The embodiments of the present invention are described in detail above with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of those skilled in the art without departing from the spirit of the present invention.

Claims

1. A process for improving the quality and efficiency of recycled water utilization, characterized by: The steps are as follows: Step 1: by setting a directional diversion channel (3) at the bottom of the tailwater conveying channel (2) of the sewage treatment plant (1), the tailwater is directed into the water inlet channel of the low-head turbine generator set (4), thereby creating conditions for the collection and conversion of kinetic energy and potential energy in the tailwater; Step 2: A low-head hydraulic generator set (4) is installed at the end of the directional diversion channel (3), and the tailwater drives the turbine of the low-head hydraulic generator set (4) to drive the generator to generate electricity, thereby converting the kinetic energy and potential energy contained in the tailwater into green electric energy; Step 3: Use the generated green electricity to provide electricity to the water pump station (6).

2. A system for improving the quality and efficiency of recycled water, characterized by The method comprises the process for improving the quality and efficiency of recycled water utilization according to claim 1, comprising a tailwater water delivery channel (2), a directional diversion channel (3), a low-head turbine generator set (4), an electric energy storage and delivery system (5), a water delivery pump station (6) and an intelligent dispatching system arranged in sequence; The directional drainage channel (3) is arranged below the bottom plate of the tailwater conveying channel (2); the bottom plate of the tailwater conveying channel (2) has a square opening, which is connected to the directional drainage channel (3) through a square bucket-shaped structure; the directional drainage channel (3) is arranged along the tailwater conveying channel (2) with a slope, and is used to convey the tailwater to the low-head turbine generator set (4) through the directional drainage channel (3); The low-head hydraulic generator set (4) is composed of a hydraulic turbine, a bearing and a generator. The hydraulic turbine receives the impact of the high-speed water flow transmitted by the directional diversion channel (3). The rotation of the hydraulic turbine drives the generator to rotate. After the generator is excited, the generator establishes voltage and starts to transmit electricity to the electric energy storage and transmission system (5) after the circuit breaker is put into operation. The electric energy storage and transmission system (5) stores or transmits the electric energy generated by the generator to the power consumption area, and converts the energy contained in the tail water transmission process into green electric energy, which is used to drive the water transmission pump station (6) to operate; The water delivery pump station (6) is used to deliver the recycled water to the water demand area; The smart dispatching system includes a device layer for data collection, an edge computing control layer, and a cloud management layer; The equipment layer comprises a flow meter A (9) arranged at the tailwater outlet of the sewage treatment plant, a flow meter B (10) arranged at the front end of the directional diversion channel (3), an electric gate valve (7) arranged at the cross section of the tailwater conveying channel (2), and a pressure regulating valve (8) arranged at the front end of the directional diversion channel (3). The electric gate valve (7) is used for water storage and water retention and tailwater conveying regulation, and the pressure regulating valve (8) is used for adjusting water flow pressure. The edge computing control layer includes a gate valve control module and a data processor. The data processor is used to receive the tailwater water volume transmitted by the equipment layer, combine it with the power of the selected turbine generator, generate the corresponding processing signal, and send the processing signal to the cloud management layer of the smart dispatching system; The cloud management layer includes a cloud processor and a communication module. The communication module is used to receive processing signals sent by the edge computing control layer. The cloud processor generates command information based on the processing signals and sends the command information to the gate valve control module of the edge computing control layer to control each device to operate in a pre-set emergency mode.

3. The system for improving the quality and efficiency of recycled water utilization according to claim 2 is characterized in that: The length of the directional diversion channel (3) is preferably ≥2m from the horizontal plane of the tailwater inlet of the upstream sewage treatment plant (1) to the inlet of the low-head turbine generator set (4) at the rear end of the directional diversion channel (3), and is adjusted according to the site conditions.

4. The system for improving the quality and efficiency of recycled water utilization according to claim 2 is characterized in that: The directional drainage channel (3) is made of a pressure steel pipe, and the inner wall is coated with polyethylene.

5. The system for improving the quality and efficiency of recycled water utilization according to claim 2 is characterized in that: The power of the low-head hydraulic generator set (4) is preferably miniaturized, and the preferred power P is less than 50KW. The total power of the low-head hydraulic generator set (4) to be installed is comprehensively calculated based on the working conditions of the tailwater transportation of the sewage treatment plant (1), the scale of the water plant, the tailwater discharge volume, the site elevation and other variables. In accordance with the design principle of miniaturization of the low-head hydraulic generator set (4), the number of hydraulic generator sets to be installed is calculated. The vertical height from the horizontal plane of the upstream water inlet to the turbine inlet of the low-head hydraulic generator set (4) that meets its operating conditions is ≥2m.

6. The system for improving the quality and efficiency of recycled water utilization according to claim 5 is characterized in that: The formula for calculating the total power of the low-head turbine generator set (4) to be installed is: P = ρ × g × h × Q × η, where P is power in Kw, ρ is the density of recycled water, and g is the acceleration of gravity, which is taken as 9.8 m / s 2 , h is the height difference, Q is the power generation flow, unit is m 3 / s, η is the efficiency coefficient, which is 0.9~0.

98.

7. The system for improving the quality and efficiency of recycled water utilization according to claim 2 is characterized in that: The flow meter A (9) at the tailwater outlet of the sewage treatment plant (1) is used to collect the tailwater flow of the sewage treatment plant (1), and analyze the real-time stability and urgency of the tailwater discharge according to the daily flow of the sewage treatment plant (1); the flow meter B (10) is used to collect the tailwater volume diverted to the power generation channel, and analyze and control the lifting height of the electric gate valve (7) set in the section of the tailwater conveyance channel (2) according to the power of the selected low-head turbine generator set (4) and the water volume data collected by the flow meter B (10).

8. The system for improving the quality and efficiency of recycled water utilization according to claim 7 is characterized in that: The normal and emergency modes refer to the normal mode and the emergency mode. The normal mode corresponds to the stable discharge state of the daily tailwater of the sewage treatment plant (1), and the emergency mode corresponds to the state in which the tailwater discharge of the sewage treatment plant (1) increases or decreases dramatically due to external conditions. The normal mode refers to the stable output of the tailwater of the sewage treatment plant (1), and the energy contained in the tailwater transportation process matches the power model of the low-head turbine generator set (4). The emergency mode refers to the excessive output of tailwater of the sewage treatment plant (1) under the influence of heavy rain or other emergencies. At this time, the emergency operation mode is activated, and the electric gate valve (7) is automatically lowered to an appropriate position through the signal transmission of the intelligent dispatching system, so that the excess tailwater is discharged through the tailwater conveying channel (2). Under the condition of ensuring the normal operation of the low-head turbine generator set (4), the healthy operation of the tailwater discharge system of the sewage treatment plant (1) is ensured.

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