An anaerobic digestion system coupling side-stream micro-aeration and mainstream electro-driving

Abstract

The present invention relates to an anaerobic digestion system coupling side-stream micro-aeration and mainstream electro-driven, which includes a side-stream micro-aeration reactor and a mainstream MEC reactor; the side-stream micro-aeration reactor and the mainstream MEC reactor are connected by a pump; the side-stream micro-aeration reactor includes an aeration disk and an ORP probe arranged at the bottom of the side-stream micro-aeration reactor; the side-stream micro-aeration reactor further includes an air pipe connected to the aeration disk, a valve is arranged on the air pipe, the valve is communicatively connected with a controller, and the controller is communicatively connected with the ORP probe; the mainstream MEC reactor includes a biological anode plate and a biological cathode plate which are arranged at intervals up and down and are connected in series by two vertically arranged wires. Compared with the prior art, the anaerobic digestion system coupling side-stream micro-aeration and mainstream electro-driven of the present invention has a high degradation efficiency and a higher organic matter hydrolysis efficiency; a high treatment efficiency and a shorter sludge retention time; better stability under higher organic loading rates; a high energy recovery rate, and a higher methane production and content.

Description

Technical Field

[0001] The present invention relates to the technical field of anaerobic digestion treatment, and in particular to an anaerobic digestion system coupling side-stream micro-aeration and mainstream electric drive. Background Art

[0002] Anaerobic digestion is an important means to realize the reduction, stabilization, harmlessness and resource utilization of organic solid waste. A good reactor structure is the guarantee for the efficient operation of anaerobic digestion. Prior to this, there have been some epoch-making and milestone anaerobic digestion reactors, such as Sequencing Batch Reactor (SBR), Membrane Bioreactor (MBR), Moving Bed Biofilm Reactor (MBBR), Upflow Anaerobic Sludge Bed (UASB), etc. However, these reactors are only suitable for treating organic wastewater and are not suitable for treating organic solid waste with a relatively high solid content. The Continuous Stirred Tank Reactor (CSTR) can be used to treat organic solid waste with a high solid content and is also the most used reactor in the actual project of anaerobic digestion of organic solid waste at present. However, due to its completely mixed flow pattern, and the anaerobic digestion process involves multiple steps of reactions and various types of microorganisms, these microorganisms usually cannot be in their highest active state in the CSTR reactor, resulting in its treatment cycle (Sludge Retention Time, SRT) being more than 20 days, seriously affecting its treatment efficiency.

[0003] In order to improve the efficiency of anaerobic digestion, previous inventors have developed two-phase anaerobic digestion reactors, which divide the entire anaerobic digestion process into a hydrolysis acidogenesis phase and a methanogenesis phase, so as to enable different functional microorganisms to maintain their highest active intervals respectively. Nevertheless, the low hydrolysis efficiency of this reactor is still the key bottleneck restricting the treatment efficiency of organic solid waste and the methane production. Moreover, the screening of hydrolysis functional microorganisms in this reactor is to screen functional microorganisms by increasing the acidity in the hydrolysis acidogenesis phase, and alkali needs to be added for neutralization when the biogas slurry enters the methanogenesis phase, which undoubtedly increases the operation cost of the reactor. Some people have also invented an anaerobic digestion reactor driven by a Microbial Electrolysis Cell (MEC) to enhance the efficiency of anaerobic digestion. However, since the electroactive microorganisms enriched at the anode are mainly Geobacter, this bacterium can only utilize small molecule organic matters (such as methanol, acetic acid, ethanol, etc.) and cannot achieve the hydrolysis and acidogenesis of complex organic matters. Therefore, it cannot significantly improve the degradation efficiency of organic matters, nor can it shorten the time required for anaerobic digestion. Some people have also tried to introduce a small amount of oxidizing substances (such as air, calcium peroxide, etc.) into the CSTR reactor to enrich facultative bacteria and achieve high hydrolysis efficiency of organic matters. However, this reactor needs to be well regulated, otherwise excessive oxidizing substances will destroy the living environment of methanogens and cause the system to collapse. In view of this, it is necessary to make new improvements to the current reactor to achieve more efficient, more stable and higher resource recovery efficiency in the treatment and disposal of organic solid waste. Summary of the Invention

[0004] The object of the present invention is to overcome the defects of the above-mentioned existing technologies and provide an anaerobic digestion system coupling side-stream micro-aeration and mainstream electro-driven, which is used to treat organic solid waste with a relatively high solid content and is also applicable to treating organic wastewater. The system includes a side-stream micro-aeration reactor and a mainstream MEC reactor. The side-stream micro-aeration reactor is used to strengthen the hydrolysis and acidification of organic solid waste, and the mainstream MEC reactor is used to strengthen the methane production process. The biogas slurry treated by the side-stream micro-aeration reactor is pumped into the mainstream MEC reactor to achieve efficient methane production.

[0005] The object of the present invention can be achieved by the following technical solutions:

[0006] The object of the present invention is to provide an anaerobic digestion system coupling side-stream micro-aeration and mainstream electro-driven. The anaerobic digestion system coupling side-stream micro-aeration and mainstream electro-driven includes a side-stream micro-aeration reactor (side-stream reactor) and a mainstream MEC reactor (mainstream reactor); the side-stream micro-aeration reactor and the mainstream MEC reactor are connected by a pump; the side-stream micro-aeration reactor is used to strengthen the hydrolysis and acidification of organic solid waste, and the mainstream MEC reactor is used to strengthen the methane production process. The biogas slurry treated by the side-stream micro-aeration reactor is pumped into the mainstream MEC reactor to achieve efficient methane production.

[0007] The side-stream micro-aeration reactor includes an aeration disk and an ORP probe arranged at the bottom of the side-stream micro-aeration reactor; the side-stream micro-aeration reactor further includes an air supply pipe connected to the aeration disk, a valve is arranged on the air supply pipe, the valve is communicatively connected with a controller, and the controller is communicatively connected with the ORP probe; the ORP data in the side-stream micro-aeration reactor is collected by the ORP probe and uploaded to the controller, and the controller controls the opening and closing of the valve to achieve precise control of the aeration volume, thereby achieving the enrichment of facultative microorganisms and further achieving the efficient hydrolysis of organic matter in the solid waste.

[0008] The mainstream MEC reactor includes a biological anode plate and a biological cathode plate. The biological anode plate and the biological cathode plate are arranged at intervals up and down and are connected in series by two vertically arranged wires, thereby achieving the efficient removal of residual oxidizing substances in the biogas slurry flowing in from the side stream to protect the methanogens in the mainstream, and also achieving the efficient methanation of hydrolysis and acidification products. The plates of the microbial electrolytic cell are arranged in the mainstream MEC reactor. On the one hand, it can be used to eliminate the residual active oxygen in the biogas slurry from the side-stream micro-aeration reactor to protect the methanogens, and on the other hand, it can enrich electroactive microorganisms to achieve the efficient methanation of hydrolysis and acidification products.

[0009] Furthermore, the micro-aeration in the side-stream micro-aeration reactor aims to enrich facultative microorganisms to achieve deep hydrolysis of organic matter, and means such as injecting a solution containing calcium peroxide and hydrogen peroxide can be adopted for enhancement.

[0010] Preferably, the bio-anode plate and the bio-cathode plate are annular electrode plates, and the arrangement method is vertical interval distribution, and they are fixed on the wall of the mainstream MEC reactor.

[0011] Furthermore, the side-stream micro-aeration reactor and the mainstream MEC reactor are connected by a conduit and a peristaltic pump, which is used to transfer the biogas slurry in the side-stream micro-aeration reactor to the mainstream MEC reactor.

[0012] Furthermore, the side-stream micro-aeration reactor further includes a first reactor tank body, a first stirring motor, a first stirring paddle, and a first electric heating rod; the first stirring paddle penetrates through the first reactor tank body; the output end of the first stirring motor is connected to the first stirring paddle to drive the first stirring paddle to rotate; the first electric heating rod penetrates through the first reactor tank body.

[0013] Furthermore, the side-stream micro-aeration reactor further includes a feed inlet, a first discharge outlet, and a first biogas collection pipe; the feed inlet, the first discharge outlet, and the first biogas collection pipe are all arranged on the first reactor tank body.

[0014] Furthermore, the mainstream MEC reactor further includes a second reactor tank body, a second stirring motor, a second stirring paddle, and a second electric heating rod; the second stirring paddle penetrates through the second reactor tank body; the output end of the second stirring motor is connected to the second stirring paddle to drive the second stirring paddle to rotate; the second electric heating rod penetrates through the second reactor tank body.

[0015] Furthermore, the mainstream MEC reactor further includes a second discharge outlet and a second biogas collection pipe; the second discharge outlet and the second biogas collection pipe are both arranged on the second reactor tank body.

[0016] Furthermore, two vertically arranged wires are respectively connected to the positive and negative poles of a DC power supply.

[0017] Preferably, the volume ratio of the side-stream micro-aeration reactor to the mainstream MEC reactor is 1:2 to 1:3.

[0018] Furthermore, the controller internally includes a logic controller. The input signal of the controller is the data signal transmitted by the ORP probe, and the output signal is the electrical signal transmitted to the valve; the valve is a solenoid valve.

[0019] Furthermore, the communication connection includes wireless or wired connection.

[0020] The working method and principle of the above anaerobic digestion system coupling side-stream micro-aeration and main-stream electro-driven are as follows:

[0021] First, the substrate enters the side-stream micro-aeration reactor through the feed port and undergoes micro-aeration in the side-stream micro-aeration reactor. As the aeration progresses, the ORP value in the side-stream micro-aeration reactor gradually increases. The ORP probe transmits the ORP value of the side-stream micro-aeration reactor to the controller. When the ORP value in the side-stream micro-aeration reactor reaches the set value, the controller controls the valve of the aeration pipe to close, and the side-stream micro-aeration reactor stops aeration. At this time, facultative bacteria in the side-stream micro-aeration reactor begin to proliferate in large numbers, and the organic matter in the side-stream micro-aeration reactor undergoes an efficient hydrolysis reaction.

[0022] As the trace molecular oxygen in the side-stream micro-aeration reactor is consumed, the ORP value of the side-stream micro-aeration reactor begins to decline. When it drops to the set value, the controller controls the valve on the aeration pipe to open, and starts to aerate the side-stream micro-aeration reactor.

[0023] During the aeration reaction, the peristaltic pump transports the biogas slurry in the side-stream micro-aeration reactor to the main-stream MEC reactor. The reactive oxygen species (ROS) in the biogas slurry can be quickly consumed by the microorganisms enriched on the bio-anode plate, avoiding the damage of reactive oxygen species (ROS) to the methanogenic microorganisms in the main-stream MEC reactor. The hydrolysis and acidification products in the biogas slurry can be quickly utilized by the microorganisms in the main-stream MEC reactor to produce methane, and the bio-anode plate and bio-cathode plate can achieve more efficient conversion of organic matter into methane.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1) The anaerobic digestion system coupling side-stream micro-aeration and main-stream electro-driven provided by the present invention, compared with the traditional anaerobic digestion reactor, performs micro-aeration in the side-stream hydrolysis and acidification phase, and precisely regulates the aeration volume through ORP to achieve the enrichment of facultative bacteria and efficiently hydrolyze organic matter. After the side-stream biogas slurry enters the main stream, the reactive oxygen species (ROS) involved are quickly utilized by the microorganisms in the MEC anode plate in the main stream, thereby reducing the toxicity to methanogens.

[0026] 2) In the anaerobic digestion system coupling side-stream micro-aeration and main-stream electro-driven provided by the present invention, the electroactive microorganisms enriched on the cathode of the electrode plate in the main-stream MEC reactor can achieve efficient methanation of volatile fatty acids (VFA) in the side-stream biogas slurry.

[0027] 3) The anaerobic digestion system with side-stream micro-aeration coupled with mainstream electro-driven provided by the present invention has the following advantages compared with traditional anaerobic digestion reactors: high degradation efficiency, with a higher organic matter hydrolysis efficiency; high treatment efficiency, with a shorter sludge retention time (SRT); good stability, with better stability under higher organic loading rate (OLR) conditions; high energy recovery rate, with higher methane production and methane content. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic structural diagram of an anaerobic digestion system with side-stream micro-aeration coupled with mainstream electro-driven in an embodiment.

[0029] The reference numerals in the figure are shown as follows:

[0030] 1. First stirring motor; 2. Feed inlet; 3. First stirring paddle; 4. First electric heating rod; 5. Discharge outlet; 6. Aeration pipe; 7. Aeration disk; 8. ORP probe; 9. First biogas collection pipe; 10. Peristaltic pump; 11. Bio-anode plate; 12. Bio-cathode plate; 13. Controller; 14. DC power supply. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] The present invention will be described in detail below with reference to the drawings and specific embodiments. Features such as component models, material names, connection structures, and control methods that are not clearly described in this technical solution are regarded as common technical features disclosed in the prior art.

[0032] Embodiment

[0033] This embodiment provides an anaerobic digestion system with side-stream micro-aeration coupled with mainstream electro-driven, including a side-stream micro-aeration reactor and a mainstream MEC reactor; the side-stream micro-aeration reactor and the mainstream MEC reactor are connected through a conduit and a peristaltic pump 10; the side-stream micro-aeration reactor is used to strengthen the hydrolysis and acidification of organic solid waste, and the mainstream MEC reactor is used to strengthen the methane production process. The biogas slurry treated by the side-stream micro-aeration reactor is pumped into the mainstream MEC reactor through a pump to achieve efficient methane production.

[0034] The side-stream micro-aeration reactor includes an aeration disk 7 and an ORP probe 8 provided at the bottom of the side-stream micro-aeration reactor; the side-stream micro-aeration reactor further includes an aeration pipe 6 connected to the aeration disk 7, and a valve is provided on the aeration pipe. The valve is communicatively connected to the controller 13, and the controller 13 is communicatively connected to the ORP probe 8; the ORP data in the side-stream micro-aeration reactor collected by the ORP probe 8 is uploaded to the controller 13, and the controller 13 controls the opening and closing of the valve to achieve precise control of the aeration volume, thereby realizing the enrichment of facultative microorganisms and further realizing the efficient hydrolysis of organic matter in solid waste.

[0035] The mainstream MEC reactor includes a biological anode plate 11 and a biological cathode plate 12. The biological anode plate 11 and the biological cathode plate 12 are circular electrode plates, arranged in a vertically spaced manner and fixed on the wall of the mainstream MEC reactor. The biological anode plate 11 and the biological cathode plate 12 are arranged at intervals up and down and are connected in series by two vertically arranged wires. The two vertically arranged wires are respectively connected to the positive and negative poles of the DC power supply 14, thereby achieving the efficient removal of residual oxidizing substances in the side-stream biogas slurry flowing in to protect the methanogens in the mainstream, and also realizing the efficient methanation of hydrolysis and acidification products. The plates of the microbial electrolytic cell MEC are arranged in the mainstream MEC reactor. On the one hand, it can be used to eliminate the residual reactive oxygen in the biogas slurry from the side-stream micro-aeration reactor to protect the methanogens, and on the other hand, it can enrich electroactive microorganisms to achieve the efficient methanation of hydrolysis and acidification products.

[0036] The side-stream micro-aeration reactor also includes a first reactor tank body, a first stirring motor 1, a first stirring paddle 3, and a first electric heating rod 4. The first stirring paddle 3 penetrates through the first reactor tank body. The output end of the first stirring motor 1 is connected to the first stirring paddle 3 to drive the first stirring paddle 3 to rotate. The first electric heating rod 4 penetrates through the first reactor tank body. The side-stream micro-aeration reactor also includes a feed inlet 2, a first discharge outlet 5, and a first biogas collection pipe 9. The feed inlet 2, the first discharge outlet 5, and the first biogas collection pipe 9 are all arranged on the first reactor tank body.

[0037] The mainstream MEC reactor also includes a second reactor tank body, a second stirring motor, a second stirring paddle, and a second electric heating rod. The second stirring paddle penetrates through the second reactor tank body. The output end of the second stirring motor is connected to the second stirring paddle to drive the second stirring paddle to rotate. The second electric heating rod penetrates through the second reactor tank body. The mainstream MEC reactor also includes a second discharge outlet and a second biogas collection pipe. The second discharge outlet and the second biogas collection pipe are both arranged on the second reactor tank body.

[0038] The controller internally includes a logic controller. The input signal of the controller is the data signal transmitted by the ORP probe 8, and the output signal is the electrical signal transmitted to the valve. The valve is a solenoid valve.

[0039] The communication connection includes wireless or wired connection.

[0040] In this embodiment, the above-mentioned side-stream micro-aeration coupled with mainstream electric-driven anaerobic digestion system is used to treat food waste. The effective volume of the side-stream micro-aeration reactor is 1 L, and the effective volume of the mainstream MEC reactor is 2 L. The food waste is taken from the swill bucket of a university cafeteria. The food waste is crushed, and its solid content (TS) is measured to be 8.72 ± 0.17%, and the volatile matter ratio (VS / TS) is 96.76 ± 0.50%.

[0041] The above anaerobic digestion system for treating food waste by coupling side-stream micro-aeration with mainstream electro-driven operates as follows:

[0042] First, 1L and 2L of inoculated sludge are added to the side-stream micro-aeration reactor and the mainstream MEC reactor respectively. The inoculated sludge is from the sludge anaerobic fermentation tank of a sewage treatment plant in Shanghai. Nitrogen is introduced into the two reactors for 10 minutes to create an anaerobic environment.

[0043] Subsequently, 100 mL of food waste is added to the side-stream micro-aeration reactor through the sampling port 2. Similarly, 100 mL of biogas slurry in the side-stream micro-aeration reactor is transported to the mainstream MEC reactor by the peristaltic pump 10, and at the same time, 100 mL of sludge is discharged from the mainstream MEC reactor.

[0044] Subsequently, the first stirring motor 1 of the side-stream micro-aeration reactor is turned on. The first stirring motor 1 drives the first stirring paddle 3 to mix the biogas slurry in the side-stream micro-aeration reactor. The second stirring motor of the mainstream MEC reactor is turned on, and the second stirring motor drives the second stirring paddle to mix the biogas slurry in the mainstream MEC reactor. At the same time, the biogas slurry in the two reactors is also mixed. At the same time, air enters the side-stream micro-aeration reactor through the air supply pipe 6 and is evenly dispersed in the side-stream micro-aeration reactor through the air diffuser 7.

[0045] Subsequently, the ORP probe 8 starts to record the ORP value in the side-stream micro-aeration reactor and uploads it to the controller. When it is detected that the ORP in the system is higher than -350 mV, the air supply pipe valve is controlled by the controller to close and the aeration stops.

[0046] Subsequently, with the introduction of air (micro-oxygen), a large number of microorganisms in the side-stream micro-aeration reactor proliferate. Among them, facultative anaerobes can use oxygen as the final electron acceptor for respiration to obtain higher energy, and their proliferation rate is the fastest.

[0047] Subsequently, the dissolved oxygen in the side-stream micro-aeration reactor is gradually consumed by the microorganisms in the side-stream micro-aeration reactor, and the ORP value in the side-stream micro-aeration reactor gradually decreases. When it drops to -420 mV, the controller controls the switch on the air supply pipe 6 to be turned on to conduct micro-aeration on the side-stream micro-aeration reactor.

[0048] When the biogas slurry in the side-stream micro-aeration reactor is transported to the mainstream MEC reactor by the peristaltic pump 10, the residual reactive oxygen species (ROS) in the biogas slurry are quickly utilized by the microorganisms on the biological anode plate 11, thus avoiding the poisoning of methanogens in the system by ROS.

[0049] Subsequently, methanogens in the mainstream MEC reactor, including the microorganisms located on the biocathode plate 12, efficiently methaneize the organic matter in the biogas slurry, and the generated biogas is discharged through the biogas collection pipe to the biogas collection device outside the reactor.

[0050] Among them, only when injecting samples is it necessary to manually turn on the switch of the peristaltic pump 10, and at other times, the side-stream micro-aeration reactor and the mainstream MEC reactor each operate automatically.

[0051] When the mainstream MEC reactor operates stably, the pH value in the mainstream MEC reactor does not decrease significantly with operation, the sample injection volume can be increased, thereby shortening the SRT and achieving more efficient kitchen waste treatment efficiency.

[0052] Through the operation of this embodiment, the methane production during anaerobic digestion increases by 60%, the VS degradation rate increases by 8%, the SRT is shortened to 15 days, and the organic loading rate can operate stably under the condition of 6 gVS / L / day.

[0053] The above description of the embodiments is for the convenience of those of ordinary skill in the art to understand and use the invention. Obviously, those skilled in the art can easily make various modifications to these embodiments and apply the general principles described herein to other embodiments without creative efforts. Therefore, the present invention is not limited to the above embodiments, and the improvements and modifications made by those skilled in the art without departing from the scope of the present invention should be within the protection scope of the present invention.

Claims

1. A side-stream micro-aeration coupled with main-stream electro-driven anaerobic digestion system, characterized in that The side-stream micro-aeration coupled with mainstream electro-driven anaerobic digestion system includes a side-stream micro-aeration reactor and a mainstream MEC reactor; The side-stream micro-aeration reactor and the mainstream MEC reactor are connected by a pump; The side-stream micro-aeration reactor includes an aeration disk (7) and an ORP probe (8) arranged at the bottom of the side-stream micro-aeration reactor; the side-stream micro-aeration reactor further includes an air supply pipe (6) connected to the aeration disk (7), a valve is arranged on the air supply pipe, the valve is communicatively connected to a controller (13), and the controller (13) is communicatively connected to the ORP probe (8); The mainstream MEC reactor includes a biocathode plate (12) and a bioanode plate (11), the bioanode plate (11) and the biocathode plate (12) are arranged at intervals up and down and are connected in series by two vertically arranged wires; The bioanode plate (11) and the biocathode plate (12) are annular electrode plates, and the arrangement method is vertical interval distribution, and they are fixed on the wall of the mainstream MEC reactor; The side-stream micro-aeration reactor and the mainstream MEC reactor are connected by a conduit and a peristaltic pump (10); It can achieve the efficient removal of residual oxidizing substances in the biogas slurry flowing from the side stream into the mainstream MEC reactor to protect the methanogens in the mainstream, and can also achieve the efficient methanation of hydrolysis acidification products; Micro-aeration is carried out in the side-stream hydrolysis acidification phase, and the aeration volume is accurately regulated by ORP to achieve the enrichment of facultative bacteria and efficiently hydrolyze organic matter. After the biogas slurry in the side stream enters the mainstream, the active oxygen involved in it is quickly utilized by the microorganisms in the MEC anode plate in the mainstream, thereby reducing the toxicity to methanogens.

2. The anaerobic digestion system with side-stream micro-aeration coupled with main-stream electric drive according to claim 1, characterized in that, The side-stream micro-aeration reactor further includes a first reactor tank body, a first stirring motor (1), a first stirring paddle (3), and a first electric heating rod (4); The first stirring paddle (3) penetrates through the first reactor tank body; The output end of the first stirring motor (1) is connected to the first stirring paddle (3) to drive the first stirring paddle (3) to rotate; The first electric heating rod (4) penetrates through the first reactor tank body.

3. The anaerobic digestion system with side-stream micro-aeration coupled with mainstream electric drive according to claim 2, wherein The side-stream micro-aeration reactor further includes a feed inlet (2), a first discharge outlet (5), and a first biogas collection pipe (9); The feed inlet (2), the first discharge outlet (5), and the first biogas collection pipe (9) are all arranged on the first reactor tank body.

4. The anaerobic digestion system with side-stream micro-aeration coupled with mainstream electric drive according to claim 1, wherein The mainstream MEC reactor further includes a second reactor tank body, a second stirring motor, a second stirring paddle, and a second electric heating rod; The second stirring paddle penetrates through the second reactor tank body; The output end of the second stirring motor is connected to the second stirring paddle to drive the second stirring paddle to rotate; The second electric heating rod penetrates through the second reactor tank body.

5. The anaerobic digestion system with side-stream micro-aeration coupled with mainstream electric drive according to claim 4, characterized in that The mainstream MEC reactor further includes a second discharge outlet and a second biogas collection pipe; The second discharge outlet and the second biogas collection pipe are both arranged on the second reactor tank body.

6. The anaerobic digestion system with side-stream micro-aeration coupled with main-stream electric drive according to claim 1, characterized in that The two vertically arranged wires are respectively connected to the positive and negative poles of a DC power supply (14).

7. The anaerobic digestion system with side-stream micro-aeration coupled with mainstream electric drive according to claim 1, wherein The volume ratio of the side-stream micro-aeration reactor to the mainstream MEC reactor is 1:2 to 1:

3.

8. The anaerobic digestion system with side-stream micro-aeration coupled with main-stream electric drive according to claim 1, characterized in that, The controller (13) includes a logic controller inside. The input signal of the controller (13) is the data signal transmitted by the ORP probe (8), and the output signal is the electrical signal transmitted to the valve. The valve is a solenoid valve.

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