Bypass device for reducing slime in biochemical treatment of cooling water

Abstract

The invention discloses a bypass device for reducing slime in biochemical treatment of cooling water, and belongs to the technical field of circulating water treatment of thermal power plants, the device comprises a filler unit and an aeration unit which are arranged in a bioreactor, and a dissolved oxygen detector and a temperature control unit which are connected with the bioreactor; the aeration unit is mounted at the bottom of the filler unit; the dissolved oxygen detector is connected with the aeration unit; and a functional microbial agent is attached to the filler unit. Loss of sludge to circulating water is reduced in a filler biofilm formation mode, growth of filamentous bacteria is inhibited by controlling the temperature of the reactor and balancing dissolved oxygen, sludge bulking is avoided, and the content of slime in the treated circulating water is reduced. The alkalinity and the total nitrogen removal efficiency are improved, after operation for a period of time, the effluent turbidity of the bioreactor is smaller than 20 NTU, slime is not generated in circulating water of the effluent, the abundance of filamentous bacteria in microbial communities is smaller than 1%, and the concentration ratio reaches more than 5 times under the condition that a corrosion and scale inhibitor is not added.

Description

Technical Field

[0001] The invention belongs to the technical field of circulating water treatment in thermal power plants, and particularly relates to a device for reducing slime in biochemical treatment of cooling water through a bypass. Background Art

[0002] The circulating cooling water system accounts for more than 80% of the water consumption in thermal power plants. Increasing the concentration ratio of circulating cooling water is of great significance for water conservation and emission reduction in thermal power plants. Biochemical treatment does not add chemical agents such as scale inhibitors, corrosion inhibitors, and bactericides, avoiding secondary pollution of chemical agents and having significant environmental benefits. Therefore, it has good prospects for popularization and application. In recent years, biochemical treatment of circulating water has received extensive attention. However, the problem of slime generated during the process of biochemical treatment of circulating cooling water needs to be solved urgently.

[0003] Chinese Patent No. 201510603628.5 discloses a biochemical water treatment agent and its usage method, which consists of composite microbial combined preparation 1 and composite microbial combined preparation 2. The compositions of composite microbial combined preparation 1 and composite microbial combined preparation 2 are disclosed in the patent. However, directly adding the composite microbial combined preparation into the open-circuit circulating cooling water in the patent will inevitably lead to the generation of slime. Excessive slime will affect the water quality of the pipe network and may further block the pipe network. This does not solve the above problems and affects the practical application of the patent. Chinese Patent No. 202223334889.6 discloses an industrial circulating cooling water treatment system, which includes adding microbial treatment agents into the circulating pipeline to treat salinity and alkalinity. However, only Bacillus subtilis is mentioned as the agent in the patent, which is used to inhibit other bacteria, and it is not clear how to reduce alkalinity. In fact, Bacillus subtilis can promote the growth of dissimilatory iron-reducing bacteria, which will corrode the pipeline. This patent does not solve the problem of slime, and the dissimilatory iron-reducing bacteria in the generated slime are corrosive to the pipe network.

[0004] Aiming at the technical problems that the existing biochemical treatment process for circulating cooling water is difficult to solve the problem of slime, slime will affect the water quality of the pipe network, may further block the pipe network, and some slime will even corrode the pipe network, it is urgent to find a new device for reducing slime in biochemical treatment of cooling water through a bypass. Summary of the Invention

[0005] In order to overcome the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a device for reducing slime in biochemical treatment of cooling water through a bypass, so as to solve the technical problems that the existing biochemical treatment process for circulating cooling water is difficult to solve the problem of slime, affects the water quality of the pipe network, and causes blockage or corrosion of the pipe network.

[0006] To achieve the above purpose, the present invention adopts the following technical solutions: The present invention discloses a device for reducing slime in biochemical treatment of cooling water by bypass, comprising: a packing unit and an aeration unit arranged inside a bioreactor, as well as a dissolved oxygen detector and a temperature control unit connected to the bioreactor; the aeration unit is installed at the bottom of the packing unit; the dissolved oxygen detector is connected to the aeration unit; and functional bacterial agents are attached to the packing unit.

[0007] Preferably, the thickness of the packing unit is 1 / 3 to 1 / 2 of that of the bioreactor.

[0008] Preferably, the inlet of the packing unit is connected to a water inlet pipe; a valve and a water pump are installed on the water inlet pipe; the outlet of the packing unit is connected to a water outlet pipe; and a valve is installed on the water outlet pipe.

[0009] Preferably, the aeration unit is detachable, and an air pump and a rotameter are installed on the aeration unit.

[0010] Preferably, the temperature control unit is a water bath temperature control device.

[0011] Preferably, the packing unit is composed of a biofilm, and the functional bacterial agents are attached to the biofilm.

[0012] Further preferably, the biofilm is a hollow fiber membrane.

[0013] The present invention also discloses a method for reducing slime in biochemical treatment of cooling water by bypass, which uses the above-mentioned device for reducing slime in biochemical treatment of cooling water by bypass, and includes: Pumping the circulating water into the inside of the bioreactor, and the functional bacterial agents on the packing unit treat the circulating water; controlling the aeration volume through the aeration unit, monitoring the equilibrium dissolved oxygen in the bioreactor in real time through the dissolved oxygen detector, and controlling the temperature of the bioreactor through the temperature control unit; and the treated circulating water overflows from the bioreactor.

[0014] Preferably, the functional bacterial agents, by mass, include: 2 - 10 parts of Nitrosomonas, 5 - 8 parts of Pseudomonas, 5 - 8 parts of Bacillus subtilis, 1 - 5 parts of Nitrobacter, and 1 - 3 parts of Thiobacillus.

[0015] Preferably, the concentration of the equilibrium dissolved oxygen in the bioreactor is controlled at 2.0 - 3.0 mg / L, and the temperature of the bioreactor is controlled at 25 - 30 °C.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a device for reducing slime in biochemical treatment of cooling water by bypass, integrating a packing unit and an aeration unit inside a bioreactor for convenient integrated management and operation. The connection between the dissolved oxygen detector and the aeration unit can monitor and adjust the aeration volume in real time to maintain an appropriate dissolved oxygen level in the bioreactor, which is beneficial to the growth and metabolism of functional bacterial agents. The functional bacterial agents are attached to the packing unit, which can efficiently treat pollutants in the circulating water and reduce the generation of slime. Through a period of operation test, the turbidity of the effluent from the bioreactor remains at a low level below 20 NTU, and no slime is found in the effluent, indicating that the device effectively reduces the sludge and slime content in the circulating water. At the same time, the test results of microbial samples show that the abundance of filamentous bacteria in the microbial community is less than 1%, proving that the device successfully inhibits the growth of filamentous bacteria by controlling the temperature of the reactor and balancing the dissolved oxygen, avoiding the problem of sludge bulking. In addition, the bioreactor can also reduce the alkalinity of the circulating water to below 2 mmol / L, and the total nitrogen removal rate reaches more than 80%, showing high efficiency in removing pollutants in water. Without adding corrosion and scale inhibitors, the concentration ratio reaches more than 5 times, showing high economy and environmental protection in treating circulating water. This device effectively reduces the loss of sludge to the circulating water by the method of packing film formation, and successfully inhibits the growth of filamentous bacteria by precisely controlling the temperature and dissolved oxygen level of the reactor, significantly reducing the slime content in the treated circulating water. It demonstrates high pollutant removal ability and good economy, providing an efficient and environmentally friendly solution for the treatment of industrial circulating cooling water systems.

[0017] Furthermore, a reasonable design of the thickness of the packing unit can ensure that the circulating water has sufficient residence time in the packing unit, enabling the functional bacterial agents to fully contact the circulating water and play their treatment role, while avoiding excessive water flow resistance caused by an overly thick packing layer.

[0018] Furthermore, through the design of the inlet pipe and the outlet pipe, the inflow and outflow of the circulating water can be conveniently controlled, and the setting of valves and pumps can adjust the water flow rate and flow volume according to actual needs, improving the flexibility and controllability of the device.

[0019] Furthermore, the detachable aeration unit is convenient for maintenance and replacement. The air pump can provide a stable aeration source, and the rotameter can monitor the aeration volume in real time to ensure that the dissolved oxygen level in the bioreactor is within an appropriate range.

[0020] Furthermore, the water bath temperature control equipment can provide stable temperature control to ensure that the temperature in the bioreactor remains within the optimal range for the growth and metabolism of the functional bacterial agents, improving the treatment efficiency.

[0021] Furthermore, as a carrier of the packing unit, the biofilm can provide a large specific surface area, which is beneficial to the attachment and growth of the functional bacterial agent. At the same time, the biofilm also has a certain filtering effect, which can further remove the suspended solids in the circulating water.

[0022] Furthermore, the hollow fiber membrane has high flux, high specific surface area and excellent mechanical properties, which can improve the attachment efficiency and treatment effect of the functional bacterial agent.

[0023] The present invention also discloses a method for reducing the slime in the biochemical treatment of cooling water by bypass. By pumping in circulating water, controlling the aeration volume, monitoring key parameters such as dissolved oxygen and temperature, the environment in the bioreactor can be ensured to be suitable for the growth and metabolism of the functional bacterial agent, so as to efficiently treat the pollutants in the circulating water and reduce the generation of slime.

[0024] Furthermore, the formula of the functional bacterial agent is reasonable and contains a variety of strains with specific functions, which can act synergistically to improve the treatment efficiency. Nitrosomonas and Nitrobacter can participate in the nitrogen cycle, Pseudomonas and Bacillus subtilis can decompose organic matter, and Thiobacillus can oxidize sulfide, jointly reducing the pollutants and slime in the circulating water.

[0025] Furthermore, reasonable control of the dissolved oxygen concentration and temperature can ensure that the growth and metabolism of the functional bacterial agent are in the optimal state, improving the treatment efficiency. At the same time, the control of these parameters can also prevent the environment in the bioreactor from being too extreme, resulting in the death or inactivation of the functional bacterial agent. Description of the Drawings

[0026] Figure 1 It is a schematic diagram of a device for reducing the slime in the biochemical treatment of cooling water by bypass disclosed by the present invention.

[0027] Among them, 1, water inlet pipe; 2, aeration unit; 3, dissolved oxygen detector; 4, packing unit; 5, temperature control unit; 6, water outlet pipe. Detailed Embodiments

[0028] The technical solutions of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the present invention, if there is no special description, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical solution.

[0030] In the present invention, if there is no special description, all the technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0031] In the present invention, unless otherwise specified, percentages (%) or parts refer to weight percentages or parts by weight relative to the composition.

[0032] In the present invention, unless otherwise specified, the various components or their preferred components involved may be combined with each other to form a new technical solution.

[0033] The "range" disclosed in the present invention can be in the form of one or more lower limits and one or more upper limits, respectively.

[0034] In the present invention, the term "and / or" used herein refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0035] In the present invention, unless otherwise specified, each reaction or operation step can be carried out sequentially or in order. Preferably, the reaction method herein is carried out sequentially.

[0036] Unless otherwise specified, the professional and scientific terms used herein have the same meanings as those familiar to persons skilled in the art. In addition, any methods or materials similar or equivalent to the described content can also be applied to the present invention.

[0037] A device for reducing slime in biochemical treatment of cooling water by bypass disclosed in the present invention includes the following structures: a water inlet pipe 1, an aeration unit 2, a dissolved oxygen detector 3, a packing unit 4, a temperature control unit 5 and a water outlet pipe 6. Among them, the packing unit 4 is composed of a biofilm, and functional bacterial agents are attached to the biofilm. The circulating water is pumped into the water inlet pipe 1 by a water pump, treated by microorganisms in the packing unit 4, and finally overflows from the reactor through the water outlet pipe 6. During the treatment process, the aeration volume is controlled by the aeration device 2, the equilibrium dissolved oxygen in the reactor is monitored in real time by the dissolved oxygen detector 3, and the temperature of the bioreactor is controlled by the temperature control unit 5. The packing layer is mainly composed of hollow fiber membranes, and highly efficient bacterial agents are attached to the packing before operation. The highly efficient bacterial agents mainly include: 2 - 10 parts of Nitrosomonas, 5 - 8 parts of Pseudomonas, 5 - 8 parts of Bacillus subtilis, 1 - 5 parts of Nitrobacter and 1 - 3 parts of Thiobacillus. The thickness of the packing layer is 1 / 3 to 1 / 2 of that of the bioreactor. A valve and a water pump are installed on the water inlet pipe 1. A valve is installed on the water outlet pipe 6. The aeration unit 2 is a detachable aeration unit, and the aeration unit 2 is equipped with an air pump and a rotameter, and the rotameter is used to control the air intake volume. The temperature control unit 5 is a water bath temperature control device.

[0038] The water inlet pipe 1, as the inlet of the circulating water, ensures the stable input of the treatment water flow and provides a basis for the entire biochemical treatment process.

[0039] The aeration unit 2 adopts a detachable design, which is convenient for maintenance and replacement. The installation of the air pump and the rotameter ensures the precise control of the aeration volume, which is beneficial to maintaining the appropriate dissolved oxygen level in the bioreactor and improving the treatment efficiency.

[0040] The dissolved oxygen detector 3 is closely connected to the aeration unit, realizing the real-time monitoring and feedback regulation of the dissolved oxygen concentration in the bioreactor, ensuring that the functional bacterial agent works under the optimal growth conditions and further improving the treatment effect.

[0041] The packing unit 4 serves as the carrier of the functional bacterial agent. Its thickness is optimized to be 1 / 3 to 1 / 2 of that of the bioreactor, ensuring that the circulating water has sufficient residence time in the packing unit, enabling the functional bacterial agent to fully contact the circulating water and play a treatment role, and significantly improving the treatment efficiency. The functional bacterial agent formula on the packing unit 4 is scientific and contains a variety of strains with specific functions, such as Nitrosomonas, Pseudomonas, Bacillus subtilis, Nitrobacter, and Thiobacillus. These strains can work together to efficiently decompose the pollutants in the circulating water, reduce the generation of slime, and significantly improve the treatment effect.

[0042] The temperature control unit 5 adopts a water bath temperature control device, which can provide stable temperature control, precisely controlling the temperature of the bioreactor within the optimal range for the growth and metabolism of the functional bacterial agent, and providing the best temperature environment for the biochemical treatment process.

[0043] The outlet pipe 6, as the outlet of the treated circulating water, ensures the stable output of the treated water flow and provides a guarantee for the completion of the entire biochemical treatment process.

[0044] Figure 1Schematic diagram of a device for reducing slime in biochemical treatment of cooling water by bypass; as can be seen from the figure, a device for reducing slime in biochemical treatment of cooling water by bypass provided by the present invention includes: a water inlet pipe 1, an aeration unit 2, a dissolved oxygen detector 3, a packing unit 4, a temperature control unit 5 and a water outlet pipe 6. The packing unit 4 and the aeration unit 2 are arranged inside the bioreactor, the dissolved oxygen detector 3 and the temperature control unit 5 are connected to the bioreactor; the aeration unit 2 is installed at the bottom of the packing unit 4; the dissolved oxygen detector 3 is connected to the aeration unit 2; functional bacteria agents are attached to the packing unit 4. The circulating water is pumped into the water inlet pipe 1 by a water pump, treated by the microorganisms in the packing unit 4, and finally overflows from the reactor through the water outlet pipe 6. During the treatment process, the aeration volume is controlled by the aeration unit 2, the equilibrium dissolved oxygen in the reactor is monitored in real time by the dissolved oxygen detector 3, and the temperature of the bioreactor is controlled by the temperature control unit 5. This device reduces the loss of sludge to the circulating water by the method of packing film formation, inhibits the growth of filamentous bacteria by controlling the temperature and equilibrium dissolved oxygen of the reactor, avoids sludge bulking, and reduces the slime content in the treated circulating water. By means of bypass treatment, the slime amount in the cooling water system can be significantly reduced, and the operation efficiency and stability of the system can be improved. At the same time, this device and method also have a wide application prospect and can be applied to various industrial circulating cooling water systems, such as petrochemical, electric power, metallurgy and other fields.

[0045] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Usually, the components described and shown in the accompanying drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the present invention claimed, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0046] Embodiment 1 A device for reducing slime in biochemical treatment of cooling water by bypass includes: a packing unit 4 and an aeration unit 2 arranged inside the bioreactor, and a dissolved oxygen detector 3 and a temperature control unit 5 connected to the bioreactor; the aeration unit 2 is installed at the bottom of the packing unit 4; the dissolved oxygen detector 3 is connected to the aeration unit 2; functional bacteria agents are attached to the packing unit 4.

[0047] The method for reducing slime in biochemical treatment of cooling water by bypass using the device for reducing slime in biochemical treatment of cooling water disclosed in this embodiment includes: pumping circulating water into the interior of the bioreactor, and treating the circulating water with the functional bactericide on the packing unit 4; controlling the aeration volume through the aeration unit 2, monitoring the equilibrium dissolved oxygen in the bioreactor in real time through the dissolved oxygen detector 3, and controlling the temperature of the bioreactor through the temperature control unit 5; and the treated circulating water overflows from the bioreactor.

[0048] Example 2 A device for reducing slime in biochemical treatment of cooling water by bypass includes: a packing unit 4 and an aeration unit 2 arranged inside the bioreactor, as well as a dissolved oxygen detector 3 and a temperature control unit 5 connected to the bioreactor; the aeration unit 2 is installed at the bottom of the packing unit 4; the dissolved oxygen detector 3 is connected to the aeration unit 2; a functional bactericide is attached to the packing unit 4. The thickness of the packing unit 4 is 1 / 3 of that of the bioreactor. The inlet of the packing unit 4 is connected to a water inlet pipe 1; a valve and a water pump are installed on the water inlet pipe 1; the outlet of the packing unit 4 is connected to a water outlet pipe 6; a valve is installed on the water outlet pipe 6. The aeration unit 2 is detachable, and an air pump and a rotameter are installed on the aeration unit 2. The temperature control unit 5 is a water bath temperature control device. The packing unit 4 is composed of a biofilm, and the functional bactericide is attached to the biofilm.

[0049] The method for reducing slime in biochemical treatment of cooling water by bypass using the device for reducing slime in biochemical treatment of cooling water disclosed in this embodiment includes: pumping circulating water into the interior of the bioreactor, and treating the circulating water with the functional bactericide on the packing unit 4; controlling the aeration volume through the aeration unit 2, monitoring the equilibrium dissolved oxygen in the bioreactor in real time through the dissolved oxygen detector 3, and controlling the temperature of the bioreactor through the temperature control unit 5; and the treated circulating water overflows from the bioreactor. The functional bactericide, by mass, includes: 2 parts of Nitrosomonas, 8 parts of Pseudomonas, 8 parts of Bacillus subtilis, 1 part of Nitrobacter, and 2.5 parts of Thiobacillus. The concentration of the equilibrium dissolved oxygen in the bioreactor is controlled at 2.5 mg / L, and the temperature of the bioreactor is controlled at 26 °C.

[0050] Example 3 A device for reducing slime in biochemical treatment of cooling water by bypass, comprising: a packing unit 4 and an aeration unit 2 disposed inside a bioreactor, as well as a dissolved oxygen detector 3 and a temperature control unit 5 connected to the bioreactor; the aeration unit 2 is installed at the bottom of the packing unit 4; the dissolved oxygen detector 3 is connected to the aeration unit 2; functional bacteria agents are attached to the packing unit 4. The thickness of the packing unit 4 is 3 / 8 of that of the bioreactor. The inlet of the packing unit 4 is connected to a water inlet pipe 1; valves and a water pump are installed on the water inlet pipe 1; the outlet of the packing unit 4 is connected to a water outlet pipe 6; valves are installed on the water outlet pipe 6. The aeration unit 2 is detachable, and an air pump and a rotameter are installed on the aeration unit 2. The temperature control unit 5 is a water bath temperature control device. The packing unit 4 is composed of a biofilm, and the functional bacteria agents are attached to the biofilm.

[0051] A method for reducing slime in biochemical treatment of cooling water by bypass using the device for reducing slime in biochemical treatment of cooling water by bypass disclosed in this embodiment, comprising: pumping circulating water into the inside of the bioreactor, and the functional bacteria agents on the packing unit 4 treat the circulating water; controlling the aeration volume through the aeration unit 2, monitoring the equilibrium dissolved oxygen in the bioreactor in real time through the dissolved oxygen detector 3, and controlling the temperature of the bioreactor through the temperature control unit 5; the treated circulating water overflows from the bioreactor. The functional bacteria agents, by mass, include: 10 parts of Nitrosomonas, 6 parts of Pseudomonas, 6 parts of Bacillus subtilis, 5 parts of Nitrobacter, and 2 parts of Thiobacillus. The concentration of the equilibrium dissolved oxygen in the bioreactor is controlled at 2.8 mg / L, and the temperature of the bioreactor is controlled at 28 °C.

[0052] Example 4 A device for reducing slime in biochemical treatment of cooling water by bypass, comprising: a packing unit 4 and an aeration unit 2 disposed inside a bioreactor, as well as a dissolved oxygen detector 3 and a temperature control unit 5 connected to the bioreactor; the aeration unit 2 is installed at the bottom of the packing unit 4; the dissolved oxygen detector 3 is connected to the aeration unit 2; functional bacteria agents are attached to the packing unit 4. The thickness of the packing unit 4 is 2 / 5 of that of the bioreactor. The inlet of the packing unit 4 is connected to a water inlet pipe 1; valves and a water pump are installed on the water inlet pipe 1; the outlet of the packing unit 4 is connected to a water outlet pipe 6; valves are installed on the water outlet pipe 6. The aeration unit 2 is detachable, and an air pump and a rotameter are installed on the aeration unit 2. The temperature control unit 5 is a water bath temperature control device. The packing unit 4 is composed of a biofilm, and the functional bacteria agents are attached to the biofilm.

[0053] The method for reducing slime in biochemical treatment of cooling water by bypass using the device for reducing slime in biochemical treatment of cooling water disclosed in this embodiment includes: pumping circulating water into the interior of the bioreactor, and treating the circulating water with the functional bacteria agent on the packing unit 4; controlling the aeration volume through the aeration unit 2, monitoring the equilibrium dissolved oxygen in the bioreactor in real time through the dissolved oxygen detector 3, and controlling the temperature of the bioreactor through the temperature control unit 5; and the treated circulating water overflows from the bioreactor. The functional bacteria agent, by mass, includes: 4 parts of Nitrosomonas, 7 parts of Pseudomonas, 7 parts of Bacillus subtilis, 4 parts of Nitrobacter, and 1 part of Thiobacillus. The concentration of the equilibrium dissolved oxygen in the bioreactor is controlled at 3.0 mg / L, and the temperature of the bioreactor is controlled at 30°C.

[0054] Example 5 A device for reducing slime in biochemical treatment of cooling water by bypass includes the following structures: a water inlet pipe 1, an aeration unit 2, a dissolved oxygen detector 3, a packing unit 4, a temperature control unit 5, and a water outlet pipe 6. Among them, the packing unit 4 is composed of a biofilm, and the functional bacteria agent is attached to the biofilm. The circulating water is pumped into the water inlet pipe 1 by a water pump, treated by the microorganisms in the packing unit 4, and finally overflows from the reactor through the water outlet pipe 6. During the treatment process, the aeration volume is controlled through the aeration unit 2, the equilibrium dissolved oxygen in the reactor is monitored in real time by using the dissolved oxygen detector 3, and the temperature of the bioreactor is controlled by the temperature control unit 5.

[0055] For the device for reducing slime in biochemical treatment of cooling water by bypass, the packing unit 4 is mainly composed of hollow fiber membranes, and the high-efficiency bacteria agent is attached to the packing unit 4 before operation. The high-efficiency bacteria agent mainly consists of: 8 parts of Nitrosomonas, 5 parts of Pseudomonas, 5 parts of Bacillus subtilis, 3 parts of Nitrobacter, and 3 parts of Thiobacillus.

[0056] The thickness of the packing layer is 1 / 2 of that of the bioreactor. A valve and a water pump are installed on the water inlet pipe 1. A valve is installed on the water outlet pipe 6. The aeration unit 2 is a detachable aeration unit. The aeration unit 2 is equipped with an air pump and a rotameter, and the rotameter is used to control the intake air volume. The equilibrium dissolved oxygen concentration in the continuous flow reactor is controlled by aeration, and the equilibrium dissolved oxygen is controlled at 2.0 mg / L. The temperature control unit 5 is a water bath temperature control device. The temperature is controlled through the temperature control unit 5, and the temperature of the bioreactor is controlled at 25°C.

[0057] After a period of operation, water samples from the effluent in the bioreactor were taken for testing. The results showed that the turbidity of the effluent from the bioreactor was less than 20 NTU, and no slime was found in the recycled water of the effluent. Taking microbial samples for testing, it was found that the abundance of filamentous bacteria in the microbial community was less than 1%. In this case, the bioreactor could reduce the alkalinity of the recycled water to below 2 mmol / L, and the total nitrogen removal rate reached over 80%. Without adding corrosion and scale inhibitors, the concentration ratio reached more than 5 times. It can be seen from this embodiment that the device reduces the loss of sludge to the recycled water by the method of packing film formation, inhibits the growth of filamentous bacteria by controlling the temperature of the reactor and balancing the dissolved oxygen, avoids sludge bulking, and reduces the content of slime in the treated recycled water.

[0058] In summary, for a device and method for reducing slime in biochemical treatment of cooling water by bypass disclosed in the present invention, through the coordinated work of various components with elaborate design, an efficient and stable biochemical treatment system is formed. The functional bacteria agent on the packing unit 4 can efficiently decompose pollutants in the recycled water. The aeration unit 2 and the dissolved oxygen detector 3 ensure an appropriate dissolved oxygen level in the bioreactor. The temperature control unit 5 provides an optimal temperature environment. The inlet pipe 1 and the outlet pipe 6 ensure the stable input and output of the treated water flow. This method not only significantly reduces the generation of slime, improves the operation efficiency and stability of the system, but also has clear steps, simple operation, is easy to be applied and popularized in actual engineering, and has broad application prospects.

[0059] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A bypass device for reducing cooling water biochemical treatment of sludge, characterized in that: include: A packing unit (4) and an aeration unit (2) are arranged inside a bioreactor, and a dissolved oxygen detector (3) and a temperature control unit (5) connected to the bioreactor; the aeration unit (2) is installed at the bottom of the packing unit (4); the dissolved oxygen detector (3) is connected to the aeration unit (2); and a functional bacterial agent is attached to the packing unit (4).

2. The bypass cooling water biochemical treatment sludge reduction device according to claim 1 is characterized in that: The thickness of the packing unit (4) is 1 / 3 to 1 / 2 of the bioreactor.

3. The bypass cooling water biochemical treatment sludge reduction device according to claim 1 is characterized in that: The inlet of the packing unit (4) is connected to a water inlet pipe (1); a valve and a water pump are installed on the water inlet pipe (1); the outlet of the packing unit (4) is connected to a water outlet pipe (6); and a valve is installed on the water outlet pipe (6).

4. The bypass cooling water biochemical treatment sludge reduction device according to claim 1 is characterized in that: The aeration unit (2) is detachable and is equipped with an air pump and a float flow meter.

5. The bypass cooling water biochemical treatment sludge reduction device according to claim 1 is characterized in that: The temperature control unit (5) is a water bath temperature control device.

6. The bypass cooling water biochemical treatment sludge reduction device according to claim 1 is characterized in that: The filler unit (4) is composed of a biofilm, and the functional bacterial agent is attached to the biofilm.

7. The bypass cooling water biochemical treatment sludge reduction device according to claim 6 is characterized in that: The biomembrane is a hollow fiber membrane.

8. A method for reducing cooling water biochemical treatment sludge by bypass, characterized in that: The bypass reduction cooling water biochemical treatment sludge device according to any one of claims 1 to 7 is used to reduce the bypass cooling water biochemical treatment sludge, comprising: The circulating water is pumped into the bioreactor, and the functional bacterial agent on the filler unit (4) treats the circulating water; the aeration volume is controlled by the aeration unit (2), the equilibrium dissolved oxygen in the bioreactor is monitored in real time by the dissolved oxygen detector (3), and the temperature of the bioreactor is controlled by the temperature control unit (5); the treated circulating water overflows the bioreactor.

9. The method for reducing cooling water biochemical treatment of slime by bypass according to claim 8, characterized in that: The functional bacterial agent comprises, by weight, 2-10 parts of Nitrosomonas, 5-8 parts of Pseudomonas, 5-8 parts of Bacillus subtilis, 1-5 parts of Nitrobacter and 1-3 parts of Thiobacillus.

10. The method for reducing cooling water biochemical treatment of slime by bypass according to claim 8, characterized in that: The equilibrium dissolved oxygen concentration in the bioreactor is controlled at 2.0-3.0 mg / L, and the temperature of the bioreactor is controlled at 25-30°C.

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