Water body biotoxicity early warning system based on self-sustaining of denitrifying microorganisms

Abstract

The invention relates to the technical field of sewage treatment, in particular to a water body biotoxicity early warning system based on self-sustaining of denitrifying microorganisms. The early warning system comprises an early warning device, an early warning filtering system located at the front end of the early warning device, a nitrate nitrogen monitor located at the rear end of the early warning device, a carbon source storage tank used for storing a carbon source and a nitrate nitrogen storage tank used for storing nitrate nitrogen. The nitrate nitrogen monitoring instrument is used for monitoring the change of the concentration of nitrate nitrogen, so that the toxicity detection and early warning of inlet water are realized. The water body biotoxicity early warning system is arranged based on denitrifying bacteria, through the biofilm filler, the early warning system is high in impact resistance and better in stability in the use process, and meanwhile, the system is more stable and reliable in the use process in cooperation with a corresponding filtering-backflushing system, a filler stirring and flushing system and a parallel system; and the device is convenient to use and maintain, is more suitable for actual production, and has wide application and popularization prospects.

Description

A water biotoxicity early warning system based on denitrifying microorganisms Technical Field

[0001] This invention relates to the field of wastewater treatment technology, specifically to a water body biotoxicity early warning system based on the self-sustaining denitrifying microorganisms. Background Technology

[0002] Existing urban domestic sewage is generally treated and purified in municipal sewage treatment plants, with biological treatment methods being the most common. The treatment process relies on the growth and reproduction of microorganisms; therefore, the activity of microorganisms is fundamental to ensuring the effectiveness of sewage treatment.

[0003] Because the influent water quality of wastewater treatment plants is highly variable, when the content of heavy metals or toxic reagents in the influent exceeds the standard, it will seriously affect the activity of microorganisms, thereby affecting the effluent water quality, and even posing a risk of shutting down the biological treatment tank; therefore, it is particularly necessary to conduct toxicity testing on wastewater treatment plants.

[0004] Existing wastewater treatment plant influent toxicity detection devices are mostly based on nitrifying bacteria, which are aerobic bacteria. Therefore, the toxicity of the influent is determined by detecting changes in dissolved oxygen; a rapid increase in dissolved oxygen indicates high toxicity. However, nitrifying bacteria proliferate slowly. Therefore, existing early warning devices often use sludge return from the end of the wastewater treatment plant to provide nitrifying bacteria, resulting in long sludge pipelines that are inconvenient for use and maintenance. Directly cultivating sludge at the influent end of the plant leads to complex system control. Furthermore, if high influent toxicity occurs and nitrifying bacteria become inactive, system recovery is a challenge, causing inconvenience. Additionally, dissolved oxygen-based detection methods are easily affected by external equipment and environmental factors, resulting in frequent fluctuations in actual use.

[0005] Therefore, this invention proposes a water biotoxicity early warning system based on denitrifying microorganisms. Based on the rapid proliferation of denitrifying bacteria and relying on biofilm packing, the system has stronger self-sustaining capacity, stronger shock resistance, and more stable operation. Based on the monitoring of nitrate nitrogen, the monitoring indicators are also more stable. At the same time, with the necessary filtration-backwashing system and packing agitator, the system operation and maintenance are more convenient and easier to use in actual production. Summary of the Invention

[0006] The purpose of this invention is to provide a water biotoxicity early warning system based on denitrifying microorganisms to solve the problems of complex system control and poor stability in use of existing early warning devices based on nitrifying bacteria, which are generally susceptible to interference.

[0007] To achieve the above objectives, the present invention adopts the following technical solution: a water body biological toxicity early warning system based on denitrifying microorganisms, wherein the water body biological toxicity early warning system is based on denitrifying microorganisms and is arranged in conjunction with the main influent pipeline of the sewage treatment plant.

[0008] The aforementioned water biotoxicity early warning system includes an early warning device, an early warning filtration system located at the front end of the early warning device, a nitrate nitrogen monitor located at the rear end of the early warning device, a carbon source storage tank for storing carbon sources, and a nitrate nitrogen storage tank for storing nitrate nitrogen. The early warning device is equipped with a packing layer. Water entering the early warning device from the bottom of the packing layer and exiting from the top of the packing layer includes total wastewater from the wastewater treatment plant and recovery water after microbial poisoning. A cavity is formed between the water above the packing layer and the top of the early warning device. An agitator is installed in the packing layer to break up packing layer compaction and / or blockage. A Venturi air intake device is installed between the early warning filtration system and the early warning device. A Venturi air extraction device is installed at the rear end of the nitrate nitrogen monitor. The Venturi air intake device works in conjunction with the agitator. The Venturi air extraction device is connected to the cavity above the packing layer, creating a negative pressure state within the cavity. The effluent from the Venturi air extraction device, rich in microbubbles, is used for backwashing the early warning filtration system. The backwash effluent is then channeled to the main inlet pipeline.

[0009] Furthermore, a flow indicator is installed on the inlet pipe of the early warning device at the front end of the early warning filtration system, and a control valve is installed at the front end of the flow indicator.

[0010] Furthermore, the aforementioned early warning filtration system includes multiple filters connected in parallel, with control valves installed at both ends of each filter; the water inlet for the early warning device flows from the front end of one of the filters to the rear end of that filter, and the water outlet rich in microbubbles from the Venturi air extraction device flows from the rear end of the remaining filter to the front end of that remaining filter.

[0011] Furthermore, the Venturi air intake device includes a Venturi tube, which is connected to an intake pipe at its throat. The intake pipe is connected to an air pump, and a control valve is installed on the intake pipe. A flow indicator is installed at the rear end of the control valve.

[0012] Furthermore, the Venturi extraction device includes a Venturi tube, the throat of which is connected to the cavity above the packing layer.

[0013] Furthermore, a waste discharge pipe is provided between the rear end of the early warning device and the nitrate nitrogen monitor. A control valve is provided on the water outlet pipe of the early warning device between the waste discharge pipe and the nitrate nitrogen monitor. The water outlet of the waste discharge pipe is connected to the main water inlet pipe.

[0014] Furthermore, the carbon source storage tank is connected to the water inlet at the bottom of the early warning device, and a delivery pump, a flow indicator, and a control valve are installed on the carbon source delivery pipeline connected to the early warning device; the nitrate nitrogen storage tank is connected to the water inlet at the bottom of the early warning device, and a delivery pump, a flow indicator, and a control valve are installed on the nitrate nitrogen delivery pipeline connected to the early warning device.

[0015] Furthermore, a delivery pump is installed on the pre-warning water inlet pipe at the front end of the control valve, and a water inlet filtration system is installed at the front end of the delivery pump.

[0016] Furthermore, the influent filtration system includes multiple filters connected in parallel, with control valves installed at both ends of each filter; the influent to the main influent pipeline of the wastewater treatment plant flows from the front end of some filters to the rear end of those filters, and the recycled water in the plant area, used as backwash water, flows from the rear end of the remaining filters to the front end of those remaining filters, and the backwash water is discharged and merged into the main influent pipeline.

[0017] Furthermore, the aforementioned water body biological toxicity early warning system is an early warning unit, and at least two early warning units are set up in parallel; the carbon source storage tank, nitrate nitrogen storage tank, and the transfer pump that is matched with the carbon source storage tank and nitrate nitrogen storage tank respectively in each early warning unit are shared; the water inlet filtration system and the transfer pump at the back end of the water inlet filtration system in each early warning unit are shared.

[0018] The beneficial effects of this invention are as follows: 1. The system of this invention is based on denitrifying bacteria and combined with biofilm packing, which makes the system more resistant to shock, more stable and durable in operation, and more suitable for actual production use; 2. By setting up an inlet water filtration-backwashing system, this invention effectively ensures the quality of the inlet water for the early warning device, thereby effectively reducing the compaction or blockage of the packing layer and ensuring the stability of system operation; 3. This invention sets up a packing agitator, which directly destroys the compacted or blocked packing through forced agitation and aerated water rinsing, without the need for packing replacement or backwashing. The impurities after the packing is destroyed are discharged with the water flow, and the denitrifying bacteria can recover to normal in a short time. Combined with multiple early warning devices, this further ensures the stability of system operation. Attached Figure Description

[0019] Figure 1 is a schematic diagram of the system layout of the present invention; Figure 2 is a schematic diagram of the structure of the early warning device of the present invention.

[0020] The names corresponding to the markings in the diagram are as follows: 1. Main inlet pipeline; 2. Early warning inlet main pipe; 21. First transfer pump; 22. First filtration system; 3. First inlet branch pipe; 31. Second filtration system; 32. First venturi tube; 33. First early warning device; 331. Inlet; 332. Packing support plate; 333. Packing pressure plate; 334. Outlet; 335. Agitator; 336. Exhaust port; 34. First online nitrate nitrogen monitor; 35. Second venturi tube; 4. Second inlet branch pipe; 41. Third filtration system; 42. Third venturi tube; 43. Second early warning device; 44. Second online nitrate nitrogen monitor; 45. Fourth venturi tube; 5. Carbon source storage tank; 6. Nitrate nitrogen storage tank. Detailed Implementation

[0021] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings in the embodiments of the present invention.

[0022] As shown in Figures 1-2, the system of the present invention is arranged based on the main influent pipeline 1 of the sewage treatment plant area and is used for monitoring and early warning of the toxicity of the main influent of the sewage treatment plant area.

[0023] During the process, a warning water inlet main pipe 2 is led out from the main water inlet pipeline 1. A first delivery pump 21 is installed on the warning water inlet main pipe 2. A first filtration system 22 is installed at the front end of the first delivery pump 21. The first filtration system 22 is used to filter the inlet water and includes two parallel pipes. A first Y-type filter is installed on each of the two parallel pipes. Control valves are installed on the parallel pipes at both ends of the two first Y-type filters. The system also includes a first backwash system, which includes a flushing pipe. The flushing pipe is fed by the plant's wastewater. The flushing pipe is fed by the rear end of the two first Y-type filters and then flows out from the front end of the two first Y-type filters. The outflowing water flows into the main water inlet pipeline 1.

[0024] The warning water inlet main pipe 2 is connected to the first water inlet branch pipe 3 and the second water inlet branch pipe 4 respectively. A first warning device 33 is installed on the first water inlet branch pipe 3, and a second warning device 43 is installed on the second water inlet branch pipe 4. The first warning device 33 and the second warning device 43 are two units connected in parallel.

[0025] A first flow indicator is installed on the first inlet branch pipe 3. A control valve is installed at the front end of the first flow indicator. A second filtration system 31 is installed at the rear end of the first flow indicator. A first venturi tube 32 is installed at the rear end of the second filtration system 31. A first early warning device 33 is installed at the rear end of the first venturi tube 32. A first online nitrate nitrogen monitor 34 is installed at the rear end of the first early warning device 33. A second venturi tube 35 is installed at the rear end of the first online nitrate nitrogen monitor 34. The second filtration system 31 includes two parallel pipes. A second Y-type filter is installed on each of the two parallel pipes. The second Y-type filters are located at their respective ends. Control valves are installed on the parallel pipelines respectively; and a second backflushing system is included, which includes a flushing pipeline. The flushing pipeline inlet water is led from the rear end of the second venturi tube 35. The flushing pipeline inlet water is respectively led from the rear end of the two second Y-type filters and then exits from the front end of the two second Y-type filters. The exit water is connected to the main inlet pipeline 1; the throat of the first venturi tube 32 is connected to the first air inlet pipe, the first air inlet pipe is connected to the air pump, and a control valve is installed on the first air inlet pipe. A second flow indicator is installed at the rear end of the control valve; an exhaust port 336 is installed above the first warning device 33, and the exhaust port 336 is connected to the throat of the second venturi tube 35.

[0026] A third flow indicator is installed on the second inlet branch pipe 4. A control valve is installed at the front end of the third flow indicator. A third filtration system 41 is installed at the rear end of the second flow indicator. A third venturi tube 42 is installed at the rear end of the third filtration system 41. A second early warning device 43 is installed at the rear end of the third venturi tube 42. A second online nitrate nitrogen monitor 44 is installed at the rear end of the second early warning device 43. A fourth venturi tube 45 is installed at the rear end of the second online nitrate nitrogen monitor 44. The second filtration system 31 includes two parallel pipes. A third Y-type filter is installed on each of the two parallel pipes. At the front and rear ends of the two third Y-type filters... Control valves are installed on the parallel pipelines respectively; and a third backflushing system is included, which includes a flushing pipeline. The flushing pipeline inlet water is introduced from the rear end of the fourth venturi tube 45. The flushing pipeline inlet water is introduced from the rear end of the two third Y-type filters respectively, and then exits from the front end of the two third Y-type filters respectively. The exit water is connected to the main inlet pipeline 1; the throat of the third venturi tube 42 is connected to the second air inlet pipe, the second air inlet pipe is connected to the air pump, and a control valve is installed on the second air inlet pipe. A fourth flow indicator is installed at the rear end of the control valve. An exhaust port 336 is installed above the second warning device 43, and the exhaust port 336 is connected to the throat of the fourth venturi tube 45.

[0027] The system includes a carbon source storage tank 5 and a nitrate nitrogen storage tank 6. The carbon source storage tank 5 is filled with a certain COD equivalent of easily degradable carbon source, such as sodium acetate, while the nitrate nitrogen storage tank 6 is filled with a certain concentration of nitrates, such as sodium nitrate. The bottom of the carbon source storage tank 5 is connected to a second transfer pump, which transports the carbon source from the storage tank 5 to the first early warning device 33 and the second early warning device 43, respectively. A fifth flow indicator and a sixth flow indicator are respectively installed for measuring the carbon source flow. The bottom of the nitrate nitrogen storage tank 6 is connected to a third transfer pump, which transports the nitrate nitrogen from the storage tank 5 to the first early warning device 33 and the second early warning device 43. Nitrate nitrogen in nitrogen storage tank 6 is transported to the first early warning device 33 and the second early warning device 43 respectively, and is equipped with a seventh flow indicator and an eighth flow indicator for measuring the flow rate of nitrate nitrogen. The flow rate is combined with the corresponding COD equivalent and nitrate nitrogen concentration, and with the inlet water flow rate, to control the amount added, such as controlling the carbon-nitrogen ratio in the reactor to be 5. The carbon source and nitrate nitrogen are collected at the inlet 331 at the bottom of the first early warning device 33 and the second early warning device 43, and enter the first early warning device 33 and the second early warning device 43 with the inlet water.

[0028] Both the first warning device 33 and the second warning device 43 have the same structure. Taking the first warning device 33 as an example, it includes a cylindrical tank made of transparent glass. An inlet 331 is located at the bottom of the tank. A packing support plate 332 is located inside the bottom of the tank, and a packing pressure plate 333 is located above the inside of the tank. Packing material, specifically suspended ball packing, is filled between the packing support plate 332 and the packing pressure plate 333. This packing material consists of a spherical PP outer shell and internal volcanic rock particles. Furthermore, a [missing information - likely a continuation of the previous sentence] is placed inside the tank. A stirrer 335 is used for forced stirring of the packing layer. An exhaust port 336 is provided above the tank body, which is connected to the throat of the corresponding Venturi tube at the rear end of the early warning device. The water inlet 331 at the bottom of the tank body of the first early warning device 33 and the second early warning device 43 is also connected to the plant's water supply and performs corresponding flow measurement for recovery after microbial poisoning. An outlet 334 is provided above the tank body, which is connected to the first water inlet branch pipe 3 behind the first early warning device 33.

[0029] Waste discharge pipes are also provided at the rear ends of the first early warning device 33 and the second early warning device 43. A first waste discharge pipe is provided at the rear end of the first early warning device 33. The first waste discharge pipe is located at the front end of the first online nitrate nitrogen monitor 34. A control valve is provided between the first waste discharge pipe and the first online nitrate nitrogen monitor 34. A control valve is provided on the first waste discharge pipe. The first waste discharge pipe merges into the main water inlet pipeline 1. A second waste discharge pipe is provided at the rear end of the second early warning device 43. The second waste discharge pipe is located at the front end of the second online nitrate nitrogen monitor 44. A control valve is provided between the second waste discharge pipe and the second online nitrate nitrogen monitor 44. A control valve is provided on the second waste discharge pipe. The second waste discharge pipe merges into the main water inlet pipeline 1.

[0030] The principle of this invention is as follows: The system of this invention is based on the characteristics of denitrifying bacteria, such as strong self-sustaining ability, rapid proliferation and strong stress resistance, which enable long-term stable operation, as well as the characteristics of few interfering factors and rapid response in nitrate nitrogen detection.

[0031] In this invention system, due to the high amount of impurities in the wastewater influent from the sewage treatment plant, a first filtration system 22 is used for primary filtration. The first filtration system 22 ensures the stable operation of the first transfer pump 21 and, in conjunction with the subsequent second filtration system 31 and third filtration system 41, further guarantees the quality of the influent to the early warning device, thereby effectively alleviating clogging and caking of the packing layer and ensuring stable system operation. A backwashing system is also employed. In the first filtration system 22, due to the high amount of impurities, treated wastewater from the plant is used for backwashing. Two first Y-type filters are used, one as a backup, to ensure the system's stability. The continuous operation of the system is achieved by using a second Venturi tube 35 and a fourth Venturi tube 45 to create a slightly negative pressure environment. This allows the generated gas to be discharged in a timely manner, preventing the accumulation of air bubbles in the packing layer. On the other hand, the extracted gas is redispersed in the water to form microbubbles, and the water rich in microbubbles is used for backwashing the Y-type filters in the second and third filtration systems 41, resulting in better backwashing. To ensure the backwashing effect, the present invention can use a hand-cranked brush-type Y-type filter in conjunction with a cleaning brush to ensure the backwashing effect.

[0032] When the equipment operates continuously, the packing layer will inevitably become compacted and clogged. In the system of this invention, due to the rapid proliferation of denitrifying bacteria, the compaction of the packing layer can be broken by directly using forced stirring to agitate the packing layer in conjunction with the first Venturi tube 32 and the second Venturi tube 35. The first Venturi tube 32 and the second Venturi tube 35 are connected to the air pump. Under the action of forced stirring and a large amount of aerated water, the wastewater generated after forced stirring is directly fed into the main inlet pipeline 1 at the front end of the online nitrate nitrogen monitor, avoiding contamination of the online nitrate nitrogen monitor sensor and reducing the maintenance frequency.

[0033] Example 1 In this example, the water biological toxicity early warning system of the present invention is arranged at the main water inlet pipeline 1 of a sewage treatment plant; it includes two early warning devices connected in parallel, and the first, second and third filtration systems 41 are each equipped with two Y-type filters connected in parallel.

[0034] First, volcanic rock packing is filled into a spherical PP shell and soaked in the effluent channel of the secondary sedimentation tank in the plant area for about one week. After the packing forms a biofilm, it is transferred to the early warning device. In this embodiment, the upper top plate and the packing pressure plate 333 of the early warning device are detachable (the upper top plate is bolted to the upper periphery of the tank, and the packing pressure plate 333 is connected to the inner periphery of the tank with ring-shaped support bolts). At this time, water is introduced into the early warning device and carbon source and nitrate nitrogen are added accordingly. After running for about one week, the system runs stably and the system starts successfully.

[0035] In this embodiment, the effective volume of the early warning device is 10L, the packing is 8L, the porosity of the packing layer is about 60%, the influent flow rate is adjusted, and the hydraulic residence time in the early warning device is controlled to be 20min. The nitrate nitrogen content in the influent of the plant area is relatively stable, about 2mg / L. The nitrate nitrogen flow rate is adjusted to control the nitrate nitrogen content in the influent of the early warning device to be about 15mg / L, and the carbon source flow rate is adjusted to control the carbon-nitrogen ratio in the influent to be about 5. In the first filtration system 22, the pore size of the filter screen in the Y-type filter is set to 3~5mm, and in the second and / or third filtration system 41, the pore size of the filter screen in the Y-type filter is set to 1~2mm.

[0036] After the system stabilized, the effluent nitrate nitrogen concentration was below 5 mg / L. During operation, the effluent nitrate nitrogen concentration was monitored to rise to 12 mg / L. The online nitrate nitrogen monitor transmitted the abnormal signal to the central control. After investigation, it was confirmed that the influent had high toxicity. In previous monitoring processes, the accuracy of the system of this invention was close to 100%.

[0037] In the operation of the aquatic biological toxicity early warning system in this embodiment, the two Y-type filters of the first, second and third filtration systems 41 are switched once a day to ensure the stability of operation. The first filtration system 22 can be backwashed for 30 to 60 minutes and then the supply of water to the medium can be stopped. The backwashing of the second and third filtration systems 41 uses the water output of the early warning device and adopts a continuous flushing method until the system is switched again.

[0038] Simultaneously, when the packing layer in the early warning device becomes caked or blocked, timely stirring and the introduction of a certain amount of gas through the air inlet pipe disrupt the caked or blocked state of the packing layer. Under stable system operation, the valve opening remains essentially unchanged. At this time, if the water inlet to the early warning device is less than 60% of the original level (or this can be determined by installing pressure gauges at the inlet 331 and outlet 334 of the early warning device; if blockage or caked-up occurs, the inlet pressure increases and the outlet pressure decreases), it can be considered that the packing layer has caked or blocked. At this time, the packing layer is stirred at a stirring intensity of 60~80 rpm. For 5 minutes, while stirring, turn on the air pump connected to the air inlet pipe. The ratio of water flow rate (L / min) to air flow rate (L / min) should be controlled at 60~150:1. Continue to introduce air for 10~20 minutes. After the outgoing water is free of obvious impurities, stop the air supply. The outgoing water flows into the main water inlet pipeline 1. After the warning device continues to supply water for 1~2 days, the biofilm in the packing material will return to normal. At this time, water quality monitoring can be carried out again. During this period, another warning device should be operated independently. During the process, try to avoid both warning devices being in a state of damaging the packing material layer at the same time.

[0039] This invention is not limited to the preferred embodiments described above. Anyone can derive other forms of products under the guidance of this invention. However, regardless of any changes made in their shape or structure, any technical solution that is the same as or similar to this application falls within the protection scope of this invention.

Claims

1. A water biotoxicity early warning system based on denitrifying microorganisms, characterized in that: The aforementioned aquatic biotoxicity early warning system is based on denitrifying microorganisms and is installed along the main influent pipeline of the wastewater treatment plant. The system includes an early warning device, an early warning filtration system located upstream of the device, a nitrate nitrogen monitor located downstream of the device, a carbon source storage tank, and a nitrate nitrogen storage tank. The early warning device contains a packing layer. Influent to the device enters from the bottom of the packing layer and exits from the top. The influent includes the main influent from the wastewater treatment plant and the recovery water after microbial poisoning. Reclaimed water is used; a cavity is formed between the water body above the packing layer and the top of the early warning device; an agitator is installed in the packing layer to break up the packing layer caking and / or blockage; a Venturi air intake device is installed between the early warning filtration system and the early warning device; a Venturi air extraction device is installed at the rear end of the nitrate nitrogen monitor; the Venturi air intake device works in conjunction with the agitator; the Venturi air extraction device is connected to the cavity above the packing layer and makes the cavity under negative pressure; the water rich in microbubbles from the Venturi air extraction device is used for backwashing of the early warning filtration system, and the backwash water is collected in the main water inlet pipeline.

2. The aquatic biotoxicity early warning system based on denitrifying microorganisms self-sufficiency according to claim 1, characterized in that: The early warning filtration system is equipped with a flow indicator on the inlet pipe of the early warning device, and a control valve is installed in front of the flow indicator.

3. The aquatic biotoxicity early warning system based on denitrifying microorganisms self-sufficiency according to claim 1, characterized in that: The aforementioned early warning filtration system includes multiple filters connected in parallel, with control valves installed at both ends of each filter; the water inlet for the early warning device flows from the front end of one of the filters to the rear end of that filter, and the water outlet rich in microbubbles from the Venturi air extraction device flows from the rear end of the remaining filters to the front end of that remaining filter.

4. The aquatic biotoxicity early warning system based on denitrifying microorganisms self-sufficiency according to claim 1, characterized in that: The Venturi intake device includes a Venturi tube, which is connected to an intake pipe at its throat. The intake pipe is connected to an air pump. A control valve is installed on the intake pipe, and a flow indicator is installed at the rear end of the control valve.

5. A water biotoxicity early warning system based on denitrifying microorganisms self-sufficiency, as described in claim 1, is characterized in that: The Venturi extraction device includes a Venturi tube, the throat of which is connected to the cavity above the packing layer.

6. The aquatic biotoxicity early warning system based on denitrifying microorganisms self-sufficiency according to claim 1, characterized in that: A waste discharge pipe is installed between the rear end of the early warning device and the nitrate nitrogen monitor. A control valve is installed on the water outlet pipe of the early warning device between the waste discharge pipe and the nitrate nitrogen monitor. The water outlet of the waste discharge pipe flows into the main water inlet pipe.

7. A water biotoxicity early warning system based on denitrifying microorganisms self-sufficiency, as described in claim 1, is characterized in that: The carbon source storage tank is connected to the water inlet at the bottom of the early warning device. A delivery pump, a flow indicator, and a control valve are installed on the carbon source delivery pipeline connected to the early warning device. The nitrate nitrogen storage tank is connected to the water inlet at the bottom of the early warning device. A delivery pump, a flow indicator, and a control valve are installed on the nitrate nitrogen delivery pipeline connected to the early warning device.

8. A water biotoxicity early warning system based on denitrifying microorganisms self-sufficiency, as described in claim 2, is characterized in that: A delivery pump is installed on the pre-warning water inlet pipe at the front end of the control valve, and a water inlet filtration system is installed at the front end of the delivery pump.

9. A water biotoxicity early warning system based on denitrifying microorganisms self-sufficiency, as described in claim 8, is characterized in that: The influent filtration system includes multiple filters connected in parallel, with control valves installed at both ends of each filter. The main influent pipeline of the wastewater treatment plant receives water from the front end of some filters to the rear end of those filters. Reclaimed water from the plant is used as backwash water and flows from the rear end of the remaining filters to the front end of those remaining filters. The backwash water is discharged and then flows into the main influent pipeline.

10. A water biotoxicity early warning system based on denitrifying microorganisms' self-sufficiency, as described in any one of claims 1-9, characterized in that: The aforementioned water biotoxicity early warning system is an early warning unit, and at least two early warning units are set up in parallel; the carbon source storage tank, nitrate nitrogen storage tank, and the transfer pump that is matched with the carbon source storage tank and nitrate nitrogen storage tank in each early warning unit are shared; the water inlet filtration system and the transfer pump at the end of the water inlet filtration system in each early warning unit are shared.

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