Self-adaptive sewage discharge management system for sandy beach

Abstract

The invention discloses a sandy beach sewage self-adaptive discharge management system, which comprises a plurality of wastewater discharge pools distributed along the coast, the wastewater discharge pools are used for collecting marine product treatment wastewater and aquaculture wastewater through pipelines, and wastewater discharge pipelines are laid from the wastewater discharge pools to the sea. A water outlet of the pipeline is positioned at the position lower than the water surface at the lowest ebb tide water level, the water outlet of the pipeline is a one-way water outlet, a pressure sensor and a water flow sensor are arranged on the outer side of the water outlet end of the pipeline, and a water inlet of the wastewater discharging pipeline is connected with a water outlet of the wastewater discharging pool through an electric control valve. A controller is connected with the pressure sensor, the water flow sensor, the electric control valve and the submersible pump, and the controller controls the electric control valve and the submersible pump to discharge sewage into the sea according to signals of the pressure sensor and the water flow sensor.

Description

Technical Field

[0001] The invention relates to a sewage adaptive discharge management system for a sandy beach. Background Art

[0002] The sewage outlet into the sea is the last "gate" for land-based pollutants to enter the marine environment. It is a key node connecting the land and the sea. Further strengthening the supervision of sewage outlets into the sea, clarifying the specific supervision requirements such as the setting, filing, and monitoring of sewage outlets into the sea, laying the foundation for standardizing and strengthening the supervision of the entire chain of sewage outlets into the sea, is of great significance for promoting the construction of beautiful bays and ensuring the safety of the marine ecological environment. The Ministry of Ecology and Environment recently issued the "Regulations on the Supervision and Management of Sewage Outlets into the Sea (Trial)". On the sandy beaches of some coastal sections of China, there are dense aquaculture farms, simple aquaculture conditions, no aquaculture wastewater treatment facilities, and wastewater is directly discharged into the sea through underground pipes. Many abandoned or in-use white water pipes are densely distributed on the beaches. Some drainage pipes are damaged, and aquaculture wastewater leaks, resulting in erosion of the beach and a great impact on the coastline landscape. Therefore, it is urgent to strengthen the management of discharge. Summary of the invention

[0003] In view of the above problems, the purpose of the present invention is to provide a sewage adaptive discharge management system for sandy beaches, which controls the discharge speed into the sea according to the changes in tide level, thereby helping to reduce the impact of sewage discharge along the sandy beach on the beach.

[0004] In order to achieve the above object, the scheme of the present invention is:

[0005] A sewage adaptive discharge management system for a sandy beach comprises a plurality of drainable wastewater pools distributed along the coast, the drainable wastewater pools are used to collect drainable wastewater from seafood processing and drainable wastewater from aquaculture through pipelines, wherein: a wastewater discharge pipeline is laid from the drainable wastewater pool to the sea, the wastewater discharge pipeline is laid under the sandy beach, the water outlet of the pipeline is positioned below the water surface at the lowest water level at low tide, the water outlet of the pipeline is a one-way water outlet, a pressure sensor and a water flow sensor are arranged on the outside of the water outlet end of the pipeline, the water inlet of the wastewater discharge pipeline is connected to the water outlet of the drainable wastewater pool through an electric control valve, a submersible pump is arranged in the drainable wastewater pool, the water outlet of the submersible pump is connected to the water inlet of the wastewater discharge pipeline through the electric control valve, a controller connects the pressure sensor and the water flow sensor as well as the electric control valve and the submersible pump, the discharge is carried out during low tide, and the controller controls the electric control valve and the submersible pump to discharge sewage into the sea according to the signals of the pressure sensor and the water flow sensor.

[0006] A further solution is that the water outlet of the pipeline is positioned 1 meter below the water surface at the lowest water level at low tide.

[0007] A further solution is that the wastewater discharge pipe is inserted into the sand bed and the seabed and fixedly laid by means of a positioning rod.

[0008] The solution is further that a controllable telescopic pipe is provided at the section where the wastewater discharge pipe enters the seawater. The controllable telescopic pipe is controlled by a controller to extend the length of the pipe entering the seawater section according to the lowering of the lowest water level at low tide, so as to ensure that the water outlet of the pipe is below the water surface. When the extended pipe cannot reach the water outlet of the pipe at the lowest water level at low tide and is underwater, an alarm is issued, and the controllable telescopic pipe is reset when the tide rises.

[0009] A further solution is that the multiple drainable wastewater pools are spaced at a distance of at least 500 meters.

[0010] The scheme is further as follows: a sedimentation tank and a discharge tank are arranged in the drainable wastewater pool, the sedimentation tank is on the water inlet side of the drainable wastewater pool, the sedimentation tank is connected to the discharge tank through an overflow port, the sewage after sedimentation in the sedimentation tank flows into the discharge tank through the overflow port, and a submersible pump is arranged in the discharge tank.

[0011] The scheme further includes: the controller controls the electric control valve and the submersible pump to discharge sewage into the sea according to the pressure sensor and the water flow sensor signal, and the step includes:

[0012] Step 1: The design high water level z is obtained based on the local coastal tidal data h and design low water level Z l Determine the difference Z between the design high water level and the design low water level o , Z o =Z h -Z l , the water level unit is meter;

[0013] Step 2: Obtain the pressure sensor data and ambient air pressure value in real time to determine the seawater depth Z at the outlet of the current pipeline t , and control the electronically controlled valves and submersible pumps according to the following rules;

[0014] When 0.5Z o +1 <Z t , open the electronically controlled valve and the submersible pump;

[0015] When 1<Z t <0.5Z o +1, half-open the electric control valve and start the submersible pump;

[0016] When Z t <1. Close the electronically controlled valve and submersible pump.

[0017] The solution is further: when Z t >Z o When it is +1.5, it is considered that a storm surge has occurred, and the electronically controlled valves and submersible pumps are closed.

[0018] The scheme is further as follows: the power input of the submersible pump uses a frequency conversion controller, the frequency conversion controller controls the output power of the submersible pump, and obtains water flow sensor data in real time;

[0019] When the return flow rate reaches or exceeds the set threshold, the submersible pump outputs at full power;

[0020] When the return flow rate is less than the set threshold, the submersible pump rate output is reduced, and as the return flow rate further decreases, the submersible pump rate output is further reduced until the submersible pump rate output is stopped.

[0021] The plan further states that the design high water level and the design low water level are calculated based on the method of seaport design water level in the "Hydrological Code for Ports and Waterways" JTS145-2015 (2022 version).

[0022] The beneficial effects of the present invention are as follows: the present invention utilizes tidal rules to control the discharge of wastewater, controls the discharge speed into the sea according to the change of tidal level, and effectively reduces the impact of sewage discharge along the sandy beach on the beach.

[0023] The present invention is described in detail below with reference to the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the present invention. DETAILED DESCRIPTION

[0025] An adaptive wastewater discharge management system for sandy beaches, such as Figure 1As shown, the system includes a plurality of drainable wastewater pools 1 distributed along the coast, the drainable wastewater pool 1 is used to collect drainable wastewater from seafood processing and drainable wastewater from aquaculture through a pipeline 2, and collects drainable wastewater that meets the discharge standard, wherein: a wastewater discharge pipe 4 is laid from the drainable wastewater pool 1 to the sea 3, the wastewater discharge pipe 4 is laid under the sandy beach 5, the wastewater discharge pipe 4 is fixedly laid by inserting a positioning rod 6 into the sand bed and the seabed, the outlet 401 of the wastewater discharge pipe 4 is positioned at a position below the water surface 301 at the lowest water level at low tide, and the present embodiment is positioned 1 meter below the water surface at the lowest water level at low tide, and the outlet 401 of the wastewater discharge pipe 4 is provided with The one-way outlet of the backwater baffle is used to prevent debris from entering and blocking the pipeline during high tide. A pressure sensor 7 and a water flow sensor 8 are arranged on the outer side of the outlet end of the wastewater discharge pipeline 4. The water inlet of the wastewater discharge pipeline 4 is connected to the outlet of the drainable wastewater pool 1 through an electric control valve 9. A submersible pump 10 is arranged in the drainable wastewater pool 1. The outlet of the submersible pump 10 is connected to the water inlet of the wastewater discharge pipeline 4 through the electric control valve 9. A controller (not shown in the figure) connects the pressure sensor 7 and the water flow sensor 8 as well as the electric control valve 9 and the submersible pump 10. The controller controls the electric control valve 9 and the submersible pump 10 to discharge sewage into the sea according to the signals of the pressure sensor 7 and the water flow sensor 8. Among them: the size of the drainable wastewater pool is determined by the specifications of the pipeline and the selection of the submersible pump is determined according to the daily discharge volume; a network communication module is arranged in the controller, and the communication module is used to communicate with the remote control center to receive or transmit data and commands.

[0026] Due to the change in the final position of the ebb tide caused by the rising and falling tides and weather changes (the amount of rainfall), there is a phenomenon that the outlet of the wastewater discharge pipe 4 may temporarily not be below the water surface. In order to ensure the discharge, the wastewater discharge pipe needs to be able to achieve short-distance regulation. Therefore, the wastewater discharge pipe is provided with a 30 to 50-meter controllable telescopic pipe 402 (for example, an elastically stretchable controllable telescopic pipe, the stretching rope is controlled by a controller on the shore through a winding motor) at the section entering the seawater. The controllable telescopic pipe 402 is controlled by the controller to extend the length of the pipe entering the seawater section according to the lowering of the lowest water level at ebb tide, so as to ensure that the outlet of the pipe is below the water surface. When the extended pipe cannot reach the outlet of the pipe at the lowest water level at ebb tide and is underwater, an alarm is issued, and the controllable telescopic pipe is reset when the tide rises.

[0027] In the embodiment, the plurality of drainable wastewater pools are spaced at a distance of at least 500 meters.

[0028] Wherein: the drainable wastewater pool is provided with a sedimentation tank 101 and a discharge tank 102, the sedimentation tank 101 is on the water inlet 103 side of the drainable wastewater pool, the sedimentation tank 101 and the discharge tank 102 can be connected by a filter net, the sedimentation tank 101 in this embodiment is connected to the discharge tank 102 through an overflow port 104, the wastewater enters the sedimentation tank 101, and the sewage after sedimentation in the sedimentation tank 101 flows into the discharge tank 102 through the overflow port 104, and the submersible pump 10 is arranged in the discharge tank 102.

[0029] In the embodiment, the step of the controller controlling the electric control valve and the submersible pump to discharge sewage into the sea according to the pressure sensor and the water flow sensor signals includes:

[0030] Step 1: The design high water level Z is obtained based on the local coastal tidal data. h and design low water level Z l Determine the difference between high and low water levels Z o , Z o =Z h -Z l , the water level unit is meter;

[0031] Step 2: Obtain the pressure sensor data and ambient air pressure value in real time (via the air pressure sensor set on the shore or obtained from the meteorological observation station) to determine the seawater depth Z at the outlet of the current pipeline t , and control the electronically controlled valves and submersible pumps according to the following rules;

[0032] When 0.5Z o +1 <Z t , open the electronically controlled valve and the submersible pump;

[0033] When 1<Z t <0.5Z o +1, half-open the electric control valve and start the submersible pump;

[0034] When Z t <1. Close the electronically controlled valve and submersible pump.

[0035] Wherein: The depth of seawater at the outlet is obtained according to common knowledge: water depth (m) = (pressure value - air pressure value) / (water body density × 0.980665) (pressure unit: dbar, density unit: g / cm 3 ; The global average atmospheric pressure is 10.1325dbar, and the average seawater density is 1.0281g / cm 3 ).

[0036] Considering the damage caused by storm surge, when Z t >Z o When it is +1.5, it is considered that a storm surge has occurred, and the electronically controlled valves and submersible pumps are closed.

[0037] In order to more effectively carry sewage to the deep sea through backflow: the power input of the submersible pump uses a frequency conversion controller, which controls the output power of the submersible pump and obtains water flow sensor data in real time;

[0038] When the return flow rate reaches or exceeds the set threshold, the submersible pump outputs at full power;

[0039] When the return flow rate is less than the set threshold, the submersible pump rate output is reduced, and as the return flow rate further decreases, the submersible pump rate output is further reduced until the submersible pump rate output is stopped.

[0040] In the embodiment: the designed high water level and the designed low water level are calculated according to the method of seaport design water level in the "Hydrological Specifications for Ports and Waterways" JTS145-2015 (2022 version).

[0041] The above-mentioned automated sewage discharge management system for the sandy beach uses tidal rules to control the discharge of wastewater, controls the discharge speed into the sea according to changes in tide levels, and effectively reduces the impact of sewage discharge along the sandy beach on the beach.

Claims

1. An adaptive wastewater discharge management system for sandy beaches, comprising a plurality of drainable wastewater pools distributed along the coast, the drainable wastewater pools being used to collect drainable wastewater from seafood processing and drainable wastewater from aquaculture through pipelines, characterized in that: A wastewater discharge pipeline is laid from the drainable wastewater pool to the sea. The wastewater discharge pipeline is laid under the sandy beach. The outlet of the pipeline is positioned below the water surface at the lowest water level at low tide. The outlet of the pipeline is a one-way outlet. A pressure sensor and a water flow sensor are arranged on the outside of the outlet end of the pipeline. The water inlet of the wastewater discharge pipeline is connected with the outlet of the drainable wastewater pool through an electric control valve. A submersible pump is arranged in the drainable wastewater pool. The outlet of the submersible pump is connected with the water inlet of the wastewater discharge pipeline through an electric control valve. A controller connects the pressure sensor and the water flow sensor as well as the electric control valve and the submersible pump. The controller controls the electric control valve and the submersible pump to discharge sewage into the sea according to the signals of the pressure sensor and the water flow sensor.

2. The management system according to claim 1, characterized in that: The water outlet of the pipeline is positioned at a position 1 meter below the water surface at the lowest water level at low tide.

3. The management system according to claim 1, characterized in that: The wastewater discharge pipeline is inserted into the sand bed and the seabed and fixedly laid by means of a positioning rod.

4. The management system according to claim 1, characterized in that: The wastewater discharge pipe is provided with a controllable telescopic pipe at the section where it enters the seawater. The controllable telescopic pipe is controlled by a controller to extend the length of the pipe entering the seawater section according to the lowering of the lowest water level at low tide, so as to ensure that the water outlet of the pipe is below the water surface. When the extended pipe cannot reach the water outlet of the pipe and is underwater at the lowest water level at low tide, an alarm is issued, and the controllable telescopic pipe is reset when the tide rises.

5. The management system according to claim 1, characterized in that: The multiple drainable wastewater pools are spaced at a distance of at least 500 meters.

6. The management system according to claim 1, characterized in that: The drainable wastewater pool is provided with a sedimentation tank and a discharge tank. The sedimentation tank is located at the water inlet side of the drainable wastewater pool. The sedimentation tank is connected to the discharge tank through an overflow port. The sewage after sedimentation in the sedimentation tank flows into the discharge tank through the overflow port. The submersible pump is arranged in the discharge tank.

7. The management system according to claim 1, characterized in that: The controller controls the electric control valve and the submersible pump to discharge sewage into the sea according to the pressure sensor and the water flow sensor signals, and the steps include: Step 1: The design high water level Z is obtained based on the local coastal tidal data. h and design low water level Z l Determine the difference between the design high water level and the design low water level z o , z o =z h -z l , the water level unit is meter; Step 2: Obtain the pressure sensor data and ambient air pressure value in real time to determine the seawater depth z at the outlet of the current pipeline t , and control the electronically controlled valves and submersible pumps according to the following rules; When 0.5z o +1<z t , open the electronically controlled valve and the submersible pump; When 1<Z t <0.5Z o +1, half-open the electric control valve and start the submersible pump; When Z t <1, close the electric control valve and submersible pump.

8. The management system according to claim 7, characterized in that: The power input of the submersible pump uses a frequency conversion controller, which controls the output power of the submersible pump and obtains water flow sensor data in real time; When the return flow rate reaches or exceeds the set threshold, the submersible pump outputs at full power; When the return flow rate is less than the set threshold, the submersible pump rate output is reduced, and as the return flow rate further decreases, the submersible pump rate output is further reduced until the submersible pump rate output is stopped.

9. The management system according to claim 7, characterized in that: When z t >z o When it is +1.5, it is considered that a storm surge has occurred, and the electronically controlled valves and submersible pumps are closed.

10. The management system according to claim 7, characterized in that: The design high water level and the design low water level are calculated according to the method of seaport design water level in the "Hydrological Code for Ports and Waterways" JTS145-2015 (2022 version).

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