Device and method for biochemical treatment of circulating cooling water of power plant

Abstract

The invention discloses a device and a method for biochemical treatment of circulating cooling water of a power plant, and belongs to the technical field of circulating water treatment agents, the device comprises a bioreactor, a temperature control system connected with the bioreactor, and an aeration system arranged at the bottom of the bioreactor, the dissolved oxygen tester and the stirring device are mounted in the bioreactor; the dynamic dissolved oxygen tester is connected with the aeration system; and a high-efficiency microbial inoculum and a nutritional agent are preloaded in the bioreactor. The efficient biochemical treatment of the circulating cooling water of the power plant is realized through the cooperative control of the addition, stirring, aeration and temperature of an efficient microbial agent and a nutritional agent as well as dynamic monitoring and adjustment. The concentration of pollutants such as bicarbonate radicals and ammonia nitrogen is obviously reduced, and the problem of scaling is solved. Through control of dissolved oxygen and temperature, filamentous fungus growth and slime generation are reduced. Chemical agents are replaced by biochemical treatment, secondary pollution is reduced, and the development requirements of green power plants are met.

Description

Technical Field

[0001] The present invention belongs to the technical field of circulating water treatment agents, and particularly relates to a device and method for biochemical treatment of circulating cooling water in a power plant. Background Art

[0002] Circulating cooling water systems account 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. Generally, thermal power plants use the method of adding corrosion and scale inhibitors to increase the concentration ratio of circulating cooling water. However, some corrosion and scale inhibitors contain toxic components, and improper treatment or discharge may cause environmental pollution. Some corrosion and scale inhibitors will release harmful gases or volatile organic compounds during production and use, causing harm to the human body. Therefore, it is necessary to develop more environmentally friendly circulating cooling water treatment technologies.

[0003] Compared with traditional circulating water treatment technologies, biochemical treatment does not add chemical agents (such as scale inhibitors, corrosion inhibitors, bactericides, etc.), 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. Chinese Patent 201510603628.5 discloses a biochemical water treatment agent and its use method, which consists of composite microbial combined preparation 1 and composite microbial combined preparation 2. The patent discloses that composite microbial combined preparation 1 mainly consists of nitrifying bacteria dry powder, Bacillus subtilis dry powder, and denitrifying bacteria dry powder; composite microbial combined preparation 2 consists of active lysozyme dry powder, single crystal glucose dry powder, ammonium sulfate, ammonium chloride, and ammonium molybdate. However, ammonium sulfate in composite microbial combined preparation 2 will bring excessive ammonium ions into the circulating water, and composite microbial combined preparation 1 lacks nitrite bacteria and cannot remove ammonium ions. At the same time, the names of the components of composite microbial combined preparation 1 are too general, and the patent does not provide a suitable application environment for the bacterial agent. Chinese Patent 202210729921.6 discloses a dynamic simulation test device and method for biochemical treatment of circulating water, which realizes the dominant growth of microbial functional bacteria by killing the original microorganisms, culturing functional bacteria by biofilm formation, and reducing the heat transfer intensity. However, the bacterial agent formula in the patent is not provided, that is, it is not clear how the dominant microorganisms grow. Moreover, the patent does not clarify what pollutants in the circulating water the microorganisms are used to treat. Chinese Patent 202411069891.6 discloses a composite biological bacterial agent for circulating cooling water, its preparation method and application. The composite biological bacterial agent includes: Lactobacillus plantarum, Lactobacillus schmidtii, Lactobacillus brevis, Bacillus licheniformis, and Nitrosomonas. However, the bacterial agent is mainly composed of bacilli, with fewer nitrifying bacteria, and its main function is to degrade COD, and the treatment effect on alkalinity is poor.

[0004] The existing biochemical treatment technology for power plant circulating water has unstable effects. The fundamental reasons are: 1. Lack of efficient functional bacteria; 2. Difficulty in controlling water quality boundary conditions in applications. In view of the poor treatment effect of power plant circulating cooling water and the problem of sludge generation, it is necessary to provide a biochemical treatment device and method to effectively treat substances such as bicarbonate and total nitrogen in circulating water and improve the concentration rate. Summary of the invention

[0005] In order to overcome the shortcomings of the above-mentioned prior art, the purpose of the present invention is to provide a device and method for biochemical treatment of circulating cooling water in a power plant, so as to solve the technical problem of how to provide a device and method for biochemical treatment of circulating cooling water in a power plant, so as to effectively treat substances such as bicarbonate and total nitrogen in the circulating water of the power plant, reduce scaling of the circulating water of the power plant, increase the concentration rate and reduce the generation of sludge.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: The invention discloses a device for biochemical treatment of circulating cooling water in a power plant, comprising a bioreactor, a temperature control system connected to the bioreactor, an aeration system arranged at the bottom of the bioreactor, and a dissolved oxygen meter and a stirring device installed inside the bioreactor; the dissolved oxygen meter is connected to the aeration system; and high-efficiency bacterial agents and nutrient agents are pre-installed in the bioreactor.

[0007] Preferably, the inlet of the bioreactor is connected to a water inlet pipe; and the outlet of the bioreactor is connected to a water outlet pipe.

[0008] The present invention also discloses a method for biochemical treatment of circulating cooling water in a power plant, which uses the above-mentioned device for biochemical treatment of circulating cooling water in a power plant to perform biochemical treatment of circulating cooling water in a power plant, and comprises the following steps: 1) Adding highly effective bacterial agents into the bioreactor; 2) Add nutrients to the bioreactor according to the alkalinity, dissolved oxygen and ammonia nitrogen indicators of the power plant's circulating cooling water; 3) Pump the circulating cooling water from the power plant into the bioreactor, stir it through a stirring device, control the equilibrium dissolved oxygen concentration in the bioreactor through an aeration system, adjust the aeration volume through a dynamic dissolved oxygen meter linked to the aeration system, and control the temperature of the bioreactor through a temperature control system; 4) Dynamically monitor water quality and microbial communities, and adjust the dosage of high-efficiency bacterial agents and nutrients.

[0009] Preferably, the dosage of the high-efficiency bacterial agent is not less than 1 / 50 of the reaction volume of the bioreactor.

[0010] Preferably, the high-efficiency bacterial agent, by mass parts, comprises: 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.

[0011] Preferably, the nutrient agent, by mass parts, comprises: 2-5 parts of (NH 4 ) 2 SO 4 , 1-2 parts of MgCl 2 ·6H 2 O, 5-10 parts of CaCl 2 ·H 2 O, 2-6 parts of KH 2 PO 4 and 1-2 parts of C 6 H 12 O 6 .

[0012] Preferably, in step 3), the stirring speed of the stirring device is 40-120 rpm.

[0013] Preferably, in step 3), the equilibrium dissolved oxygen concentration is controlled at 1.0-6.0 mg / L.

[0014] Preferably, in step 3), the temperature of the bioreactor is controlled at 20-40 °C.

[0015] Preferably, in step 4), the microbial community structure in the bioreactor is determined by 16S rRNA.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention discloses a device for biochemical treatment of circulating cooling water in a power plant. By controlling the equilibrium dissolved oxygen concentration in a continuous flow reactor through an aeration system, it can continuously treat the concentrated circulating water in the power plant and accelerate mass transfer during the process through stirring; control the temperature through a temperature control system; reduce the growth of filamentous bacteria in the bioreactor and inhibit sludge bulking by controlling dissolved oxygen and temperature; achieve coordinated control of temperature, dissolved oxygen, and mass transfer through an integrated design to improve treatment efficiency; inhibit the growth of filamentous bacteria by controlling dissolved oxygen and temperature, reduce the generation of slime, lower the risk of system blockage, and extend the equipment life; through the metabolism of microorganisms in the bactericide, treat substances such as bicarbonate and total nitrogen in the circulating water of the power plant. By adding highly efficient bactericide and nutrient agent, the concentration ratio of the circulating water is significantly increased, the makeup water volume and sewage discharge volume are reduced, and problems such as scale formation in the circulating water of the power plant are solved. The device for biochemical treatment of circulating cooling water in the power plant disclosed by the present invention relies entirely on biodegradation, without adding chemical scale inhibitors or bactericides, reducing the chemical agent cost and having no secondary pollution. Synchronously control carbonate scale and biological slime, and improve the concentration ratio of the circulating water. By inhibiting sludge bulking and slime generation, extend the cleaning cycle of heat exchangers and pipelines, and reduce the maintenance frequency. Dynamically adjust the operating parameters according to different water qualities, and it is applicable to the circulating water scenarios of power plants with high salt and high hardness.

[0017] Further, a water inlet pipe is connected to the inlet of the bioreactor; a water outlet pipe is connected to the outlet of the bioreactor; it is connected to the top inlet of the bioreactor through a water pump for transporting the circulating water to be treated; the water outlet pipe is the overflow outlet of the bioreactor.

[0018] The present invention also discloses a method for biochemical treatment of circulating cooling water in a power plant. The addition of highly efficient bacterial agents ensures the rapid formation of dominant bacterial populations in the bioreactor, shortening the start-up time. The nutrient agents are accurately added according to water quality indicators to provide balanced nutrition for microorganisms and enhance their metabolic activity. The addition of nutrient agents promotes the degradation of pollutants such as ammonia nitrogen and bicarbonate by microorganisms, further improving the treatment efficiency. The dosage of nutrient agents is adjusted according to changes in water quality to ensure stable and efficient treatment. The stirring device operates to promote the full contact between highly efficient bacterial agents and pollutants, improving the mass transfer efficiency. The dynamic dissolved oxygen analyzer is linked with the aeration system to dynamically adjust the aeration volume, inhibit the growth of filamentous bacteria, and reduce the risk of sludge bulking. The temperature control system controls the temperature of the bioreactor to ensure that microorganisms are in the optimal activity range, while inhibiting the proliferation of non-target bacterial populations. Through the coordinated control of stirring, aeration, and temperature, efficient and stable pollutant degradation is achieved. By dynamically monitoring water quality (such as alkalinity, dissolved oxygen, ammonia nitrogen, etc.) and microbial community structure (such as 16S rRNA sequencing), the dosages of highly efficient bacterial agents and nutrient agents are adjusted in a timely manner to ensure continuous and stable treatment effects. The present invention inhibits the growth of filamentous bacteria, reduces the generation of slime, and lowers the risk of system blockage through precise control of dissolved oxygen and temperature. It reduces sludge bulking and slime generation, lowers the equipment maintenance frequency, and extends the service life of equipment. The dosages of bacterial agents and nutrient agents are dynamically adjusted to avoid over-addition, reducing the costs of chemicals and energy consumption.

[0019] Further, the dosage of the highly efficient bacterial agent is not less than 1 / 50 of the reaction volume of the bioreactor to ensure the initial dominance of the bacterial population and rapidly start the biological treatment.

[0020] Further, by mass fraction, the highly efficient bacterial agent includes: 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 composite bacterial population synergistically degrades bicarbonate, ammonia nitrogen, and total nitrogen, directly reducing the formation of water scale and solving the problem of water scale formation in the circulating water of the power plant.

[0021] Further, by mass fraction, the nutrient agent includes: 2 - 5 parts of (NH 4 ) 2 SO 4 , 1 - 2 parts of MgCl 2 ·6H 2 O, 5 - 10 parts of CaCl 2 ·H 2 O, 2 - 6 parts of KH 2 PO 4 and 1 - 2 parts of C 6 H 12 O 6 ; it provides a carbon source, nitrogen source, and trace elements, balances nutrition, strengthens the nitrogen removal and scale removal ability, improves the pollutant removal efficiency by optimizing the microbial metabolic environment, and at the same time avoids the inactivation of bacterial populations caused by insufficient nutrition.

[0022] Furthermore, the stirring speed of the stirring device is 40 - 120 rpm, which enhances the contact efficiency between pollutants, oxygen, and the bacterial agent, avoids uneven treatment caused by local dead zones, prevents the destruction of the zoogloea structure or the damage of bacterial cells due to high-speed stirring while improving the mass transfer efficiency, and ensures the stability of the biofilm. The balanced dissolved oxygen concentration is controlled at 1.0 - 6.0 mg / L, which promotes the metabolism of aerobic bacteria, efficiently removes nitrogen and scale, inhibits the growth of filamentous bacteria, and reduces the blockage of pipelines and equipment by slime. The temperature of the bioreactor is controlled at 20 - 40 °C, which maintains the optimal activity of the highly efficient bacterial agent, while inhibiting the overgrowth of thermophilic or psychrophilic filamentous bacteria; it avoids the impact of temperature fluctuations on the microbial community, ensures the stability of the treatment process, and reduces the risk of sludge bulking caused by temperature discomfort. By balancing the mass transfer efficiency and energy consumption, the destruction of the bacterial community structure is prevented.

[0023] Furthermore, the microbial community structure in the bioreactor is measured by 16S rRNA, and the highly efficient bacterial agent is supplemented in a timely manner or the dosage of the nutrient agent is adjusted to precisely control the bacterial community composition, avoid bacterial community imbalance, and reduce the treatment efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of a device for biochemical treatment of circulating cooling water in a power plant disclosed by the present invention; Among them, 1 is the water inlet pipe; 2 is the bioreactor; 3 is the water outlet pipe; 4 is the temperature control system; 5 is the aeration system; 6 is the dynamic dissolved oxygen analyzer; 7 is the stirring device. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0025] The technical solutions of the present invention will be described clearly and completely below. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. 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.

[0026] In the present invention, if there is no special indication, all the embodiments and preferred implementation methods mentioned herein can be combined with each other to form a new technical solution.

[0027] In the present invention, if there is no special indication, all the technical features and preferred features mentioned herein can be combined with each other to form a new technical solution.

[0028] In the present invention, if there is no special indication, the percentage (%) or part refers to the weight percentage or weight part relative to the composition.

[0029] In the present invention, if there is no special indication, the various components or their preferred components involved can be combined with each other to form a new technical solution.

[0030] In the present invention, unless otherwise specified, the numerical range "a~b" represents an abbreviated representation of any real number combination between a and b, where both a and b are real numbers. For example, the numerical range "6~22" means that all real numbers between "6~22" are fully listed herein, and "6~22" is only an abbreviated representation of these numerical combinations.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] A device for biochemical treatment of circulating cooling water in a power plant provided by the present invention includes: a water inlet pipe 1, a bioreactor 2, a water outlet pipe 3, a temperature control system 4, an aeration system 5, a dynamic dissolved oxygen analyzer 6, and a stirring device 7. The water inlet pipe 1 pumps the circulating water to be treated into the bioreactor 2 by means of a water pump; high-efficiency bacterial agents and nutrient agents are added to the bioreactor 2; the temperature of the bioreactor 2 is controlled by the temperature control system 4; air is introduced into the system through the aeration system 5, the dissolved oxygen is monitored by the dynamic dissolved oxygen analyzer 6, and the aeration volume of the aeration system 5 is adjusted; the system is stirred by the stirring device 7 to accelerate the mass transfer process; the treated circulating water overflows and flows out through the water outlet pipe 3.

[0036] A method for biochemical treatment of circulating cooling water in a power plant provided by the present invention includes the following steps: Step 1: First, add high-efficiency bacterial agents to the bioreactor 2, and the dosage of the high-efficiency bacterial agents is not less than 1 / 50 of the reaction volume of the bioreactor 2, preferably 1 / 10 to 1 / 2. The main components of the high-efficiency bacterial agents 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.

[0037] Step 2: Measure the alkalinity, dissolved oxygen, ammonia nitrogen and other indicators of the concentrated circulating cooling water in the power plant, and add nutrient agents to the bioreactor 2 according to the indicators. The composition of the nutrient agents is as follows: 2-5 parts of (NH 4 )2 SO 4 , 1 - 2 parts of MgCl 2 ·6H 2 O, 5 - 10 parts of CaCl 2 ·H 2 O, 2 - 6 parts of KH 2 PO 4 and 1 - 2 parts of C 6 H 12 O 6 ; preferably 3 parts of (NH 4 ) 2 SO 4 , 1 part of MgCl 2 ·6H 2 O, 10 parts of CaCl 2 ·H 2 O, 6 parts of KH 2 PO 4 , 1 part of C 6 H 12 O 6 .

[0038] Step 3: Pump the circulating water to be treated into the bioreactor 2 through a water pump. Accelerate the mass transfer during the process by stirring, and control the stirring rate at 40 - 120 rpm, preferably 80 - 100 rpm. Control the balanced dissolved oxygen concentration in the bioreactor 2 through the aeration system 5, and control the balanced dissolved oxygen at 1.0 - 6.0 mg / L, preferably 2.0 - 3.0 mg / L. Control the temperature of the bioreactor 2 at 20 - 40 °C through the temperature control system 4, preferably 25 - 30 °C.

[0039] Step 4: During the treatment process, add nutrient agents according to the changes in the quality of the circulating water to be treated; use 16S rRNA to measure the community structure of microorganisms in the bioreactor 2, and judge whether to continue adding high - efficiency bactericides according to the measurement results.

[0040] Please refer to Figure 1Schematic diagram of a device for biochemical treatment of circulating cooling water in a power plant disclosed by the present invention; as can be seen from the figure, a device for biochemical treatment of circulating cooling water in a power plant disclosed by the present invention includes: a water inlet pipe 1, a bioreactor 2, a water outlet pipe 3, a temperature control system 4, an aeration system 5, a dynamic dissolved oxygen analyzer 6, and a stirring device 7. The water inlet pipe 1 is used to introduce circulating cooling water into the bioreactor 2. The bioreactor 2 receives the circulating cooling water from the water inlet pipe 1 and conducts biochemical treatment. The water outlet pipe 3 discharges the treated water from the bioreactor 2. The temperature control system 4 is connected to the bioreactor 2 and is used to adjust and control the temperature inside the bioreactor 2. The aeration system 5 is connected to the bioreactor 2 to provide oxygen to support the biochemical reaction. The dynamic dissolved oxygen analyzer 6 is connected to the bioreactor 2 and is used to monitor the dissolved oxygen level inside the bioreactor 2. The stirring device 7 is installed inside the bioreactor 2 and is used to mix and stir the liquid inside the bioreactor 2 to ensure a uniform biochemical reaction. These components are interconnected through pipelines and control systems to jointly complete the biochemical treatment process of the circulating cooling water in the power plant.

[0041] A device and method for biochemical treatment of circulating cooling water in a power plant provided by the present invention. First, a high-efficiency bactericide is added to the bioreactor 2, and then indicators such as the alkalinity, dissolved oxygen, and ammonia nitrogen of the circulating cooling water in the power plant are measured, and nutrient agents are added to the bioreactor 2 according to the indicators. The concentrated circulating water in the power plant is continuously treated, and mass transfer during the process is accelerated through stirring. The equilibrium dissolved oxygen concentration in the bioreactor 2 is controlled through the aeration system 5, and the temperature is controlled through the temperature control system 4. The growth of filamentous bacteria in the bioreactor 2 is reduced by controlling the dissolved oxygen and temperature, and sludge bulking is inhibited. The present invention processes substances such as bicarbonate radical and total nitrogen in the circulating water of the power plant through the metabolism of microorganisms in the high-efficiency bactericide, solves problems such as scaling of the circulating water in the power plant, and improves the concentration ratio of the circulating water in the power plant. At the same time, the growth of filamentous bacteria in the bioreactor 2 is inhibited by controlling the working conditions, and the generation of slime is reduced.

[0042] 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 in conjunction with 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 accompanying drawings is not intended to limit the scope of the claimed present invention, 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 fall within the protection scope of the present invention.

[0043] Example 1 A device for biochemical treatment of circulating cooling water in a power plant includes: a bioreactor 2, a temperature control system 4 connected to the bioreactor 2, which optimizes the microbial activity by controlling the temperature and simultaneously inhibits the proliferation of non-target flora. An aeration system 5 is provided at the bottom of the bioreactor 2, and a dynamic dissolved oxygen analyzer 6 and a stirring device 7 are installed inside the bioreactor 2; stirring accelerates the mass transfer process to ensure sufficient contact between the bacterial agent and the pollutants. The dynamic dissolved oxygen analyzer 6 is connected to the aeration system 5; it monitors and adjusts the dissolved oxygen concentration in real time to inhibit the growth of filamentous bacteria and reduce sludge bulking and slime generation. The bioreactor 2 is pre-filled with a high-efficiency bacterial agent and a nutrient agent. The high-efficiency bacterial agent can efficiently degrade pollutants such as bicarbonate and ammonia nitrogen in the circulating water, significantly reducing the risk of scaling. The addition of the nutrient agent optimizes the microbial metabolic environment and further improves the degradation efficiency. By replacing chemical agents with biochemical treatment, secondary pollution is reduced, and the operating cost is lowered simultaneously.

[0044] A method for biochemical treatment of circulating cooling water in a power plant includes the following steps: 1) Add a high-efficiency bacterial agent to the bioreactor 2, and the dosage is 1 / 50 of the reaction volume of the bioreactor 2; by mass fraction, the composition of the high-efficiency bacterial agent includes: 2 parts of Nitrosomonas, 5 parts of Pseudomonas, 5 parts of Bacillus subtilis, 1 part of Nitrobacter, and 1 part of Thiobacillus.

[0045] 2) Add a nutrient agent to the bioreactor 2 according to the alkalinity, dissolved oxygen, and ammonia nitrogen indexes of the circulating cooling water in the power plant; by mass fraction, the composition of the nutrient agent includes: 2 parts of (NH 4 ) 2 SO 4 , 1 part of MgCl 2 ·6H 2 O, 5 parts of CaCl 2 ·H 2 O, 2 parts of KH 2 PO 4 and 1 part of C 6 H 12 O 6 .

[0046] 3) Pump the circulating cooling water of the power plant into the bioreactor 2, control the stirring rate at 40 rpm for stirring through the stirring device 7, control the equilibrium dissolved oxygen concentration in the bioreactor 2 at 1.0 mg / L through the aeration system 5, adjust the aeration volume through the linkage of the dynamic dissolved oxygen analyzer 6 and the aeration system 5, and control the temperature of the bioreactor 2 at 20 °C through the temperature control system 4.

[0047] 4) Dynamically monitor the water quality and microbial community, and adjust the dosage of the high-efficiency bacterial agent and the nutrient agent.

[0048] Example 2 A device for biochemical treatment of circulating cooling water in a power plant includes: a bioreactor 2, a temperature control system 4 connected to the bioreactor 2, an aeration system 5 arranged at the bottom of the bioreactor 2, and a dynamic dissolved oxygen analyzer 6 and a stirring device 7 installed inside the bioreactor 2; the dynamic dissolved oxygen analyzer 6 is connected to the aeration system 5; the bioreactor 2 is pre-filled with high-efficiency bacterial agents and nutrient agents. The inlet of the bioreactor 2 is connected to a water inlet pipe 1; the outlet of the bioreactor 2 is connected to a water outlet pipe 3.

[0049] A method for biochemical treatment of circulating cooling water in a power plant includes the following steps: 1) Add high-efficiency bacterial agents to the bioreactor 2, and the dosage is 1 / 10 of the reaction volume of the bioreactor 2; by mass fraction, the composition of the high-efficiency bacterial agents includes: 5 parts of Nitrosomonas, 6 parts of Pseudomonas, 6 parts of Bacillus subtilis, 2 parts of Nitrobacter, and 2 parts of Thiobacillus.

[0050] 2) Measure the alkalinity, dissolved oxygen, and ammonia nitrogen indexes of the circulating water, and add nutrient agents according to the indexes. By mass fraction, the composition of the nutrient agents includes: 3 parts of (NH 4 ) 2 SO 4 , 2 parts of MgCl 2 ·6H 2 O, 6 parts of CaCl 2 ·H 2 O, 3 parts of KH 2 PO 4 and 2 parts of C 6 H 12 O 6 .

[0051] 3) Pump the circulating water into the bioreactor 2 through a water pump; control the stirring rate at 80 rpm to accelerate the mass transfer process. Control the dissolved oxygen concentration at 3.0 mg / L through the aeration system 5. Control the temperature at 28 °C through the temperature control system 4.

[0052] 4) During the treatment process, supplement nutrient agents according to the water quality changes. Use 16S rRNA sequencing to analyze the microbial community structure to judge whether to supplement high-efficiency bacterial agents. Control the growth of filamentous bacteria through dissolved oxygen and temperature control to reduce sludge bulking and slime generation.

[0053] Example 3 A device for biochemical treatment of circulating cooling water in a power plant comprises: a bioreactor 2, a temperature control system 4 connected to the bioreactor 2, an aeration system 5 arranged at the bottom of the bioreactor 2, and a dynamic dissolved oxygen analyzer 6 and a stirring device 7 installed inside the bioreactor 2; the dynamic dissolved oxygen analyzer 6 is connected to the aeration system 5; the bioreactor 2 is pre-filled with high-efficiency bacteria agents and nutrient agents. The inlet of the bioreactor 2 is connected to a water inlet pipe 1; the outlet of the bioreactor 2 is connected to a water outlet pipe 3.

[0054] A method for biochemical treatment of circulating cooling water in a power plant comprises the following steps: 1) Add high-efficiency bacteria agents to the bioreactor 2, and the dosage is 1 / 6 of the reaction volume of the bioreactor 2; by mass fraction, the composition of the high-efficiency bacteria agents includes: 8 parts of Nitrosomonas, 7 parts of Pseudomonas, 7 parts of Bacillus subtilis, 3 parts of Nitrobacter, and 3 parts of Thiobacillus.

[0055] 2) Measure the alkalinity, dissolved oxygen and ammonia nitrogen indexes of the circulating water, and add nutrient agents according to the indexes. By mass fraction, the composition of the nutrient agents includes: 4 parts of (NH 4 ) 2 SO 4 , 1 part of MgCl 2 ·6H 2 O, 8 parts of CaCl 2 ·H 2 O, 4 parts of KH 2 PO 4 and 1 part of C 6 H 12 O 6 .

[0056] 3) Pump the circulating water into the bioreactor 2 through a water pump; control the stirring rate at 100 rpm to accelerate the mass transfer process. Control the dissolved oxygen concentration at 4.0 mg / L through the aeration system 5. Control the temperature at 30 °C through the temperature control system 4.

[0057] 4) During the treatment process, supplement nutrient agents according to the water quality changes. Use 16S rRNA sequencing to analyze the microbial community structure and judge whether to supplement high-efficiency bacteria agents. Control the growth of filamentous bacteria through dissolved oxygen and temperature control to reduce sludge bulking and slime generation.

[0058] Example 4 A device for biochemical treatment of circulating cooling water in a power plant includes: a bioreactor 2, a temperature control system 4 connected to the bioreactor 2, an aeration system 5 arranged at the bottom of the bioreactor 2, and a dynamic dissolved oxygen analyzer 6 and a stirring device 7 installed inside the bioreactor 2; the dynamic dissolved oxygen analyzer 6 is connected to the aeration system 5; highly efficient bacteria agents and nutrient agents are pre-loaded in the bioreactor 2. The inlet of the bioreactor 2 is connected to a water inlet pipe 1; the outlet of the bioreactor 2 is connected to a water outlet pipe 3.

[0059] A method for biochemical treatment of circulating cooling water in a power plant includes the following steps: 1) Add highly efficient bacteria agents to the bioreactor 2, and the dosage is 1 / 2 of the reaction volume of the bioreactor 2; by mass fraction, the composition of the highly efficient bacteria agents includes: 10 parts of Nitrosomonas, 8 parts of Pseudomonas, 8 parts of Bacillus subtilis, 5 parts of Nitrobacter, and 2 parts of Thiobacillus.

[0060] 2) Measure the alkalinity, dissolved oxygen, and ammonia nitrogen indexes of the circulating water, and add nutrient agents according to the indexes. By mass fraction, the composition of the nutrient agents includes: 5 parts of (NH 4 ) 2 SO 4 , 2 parts of MgCl 2 ·6H 2 O, 10 parts of CaCl 2 ·H 2 O, 6 parts of KH 2 PO 4 and 2 parts of C 6 H 12 O 6 .

[0061] 3) Pump the circulating water into the bioreactor 2 through a water pump; control the stirring rate at 120 rpm to accelerate the mass transfer process. Control the dissolved oxygen concentration at 6.0 mg / L through the aeration system 5. Control the temperature at 40 °C through the temperature control system 4.

[0062] 4) During the treatment process, supplement nutrient agents according to the water quality changes. Use 16S rRNA sequencing to analyze the microbial community structure to judge whether to supplement highly efficient bacteria agents. Control the growth of filamentous bacteria through dissolved oxygen and temperature to reduce sludge bulking and slime generation.

[0063] Example 5 A device for biochemical treatment of circulating cooling water in a power plant includes: a water inlet pipe 1, a bioreactor 2, a water outlet pipe 3, a temperature control system 4, an aeration system 5, a dynamic dissolved oxygen analyzer 6, and a stirring device 7.

[0064] The inlet pipe 1 uses a water pump to pump the circulating water to be treated into the bioreactor 2; highly efficient bacterial agents and nutrient agents are added to the bioreactor 2; the temperature of the bioreactor 2 is controlled by the temperature control system 4; air is introduced into the system through the aeration system 5, and the dissolved oxygen is monitored by the dynamic dissolved oxygen analyzer 6 and the aeration volume of the aeration system 5 is adjusted; the system is stirred by the stirring device 7 to accelerate the mass transfer process; the treated circulating water overflows and flows out through the outlet pipe 3.

[0065] A method for biochemical treatment of circulating cooling water in a power plant includes the following steps: Step 1: First, add a highly efficient bacterial agent to the bioreactor 2, and the dosage of the highly efficient bacterial agent is not less than 1 / 5 of the reaction volume of the bioreactor 2.

[0066] Step 2: Measure the alkalinity, dissolved oxygen, ammonia nitrogen, nitrite nitrogen, nitrate nitrogen, COD and other indicators of the concentrated circulating cooling water in the power plant, and add nutrient agents to the bioreactor 2 according to the indicators. The composition of the nutrient agent is as follows: 3 parts of (NH 4 ) 2 SO 4 , 1 part of MgCl 2 ·6H 2 O 7, 10 parts of CaCl 2 ·H 2 O 7, 6 parts of KH 2 PO 4 7, 1 part of C 6 H 12 O 6 .

[0067] Step 3: Pump the circulating water to be treated into the bioreactor 2 through a water pump. Stirring is used to accelerate the mass transfer during the process, and the stirring rate is controlled at 100 rpm. The equilibrium dissolved oxygen concentration in the bioreactor 2 is controlled by the aeration system 5, and the equilibrium dissolved oxygen is controlled at 2.0 mg / L. The temperature of the bioreactor 2 is controlled at 25 °C by the temperature control system 4.

[0068] Step 4: During the treatment process, add nutrient agents according to the changes in the quality of the treated circulating water; use 16S rRNA to measure the community structure of microorganisms in the bioreactor 2, and judge whether to continue adding highly efficient bacterial agents according to the measurement results.

[0069] After a period of operation, microbial samples in the bioreactor 2 were taken for testing. The results showed that the microorganisms mainly included: Nitrosomonas, Pseudomonas, Bacillus subtilis, Nitrobacter, and Thiobacillus. The above microbial community in the bioreactor 2 could reduce the alkalinity of the circulating 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 over 5 times. It can be seen from Example 1 of the present invention that the present invention effectively treats substances such as bicarbonate and total nitrogen in the power plant circulating water, solves problems such as scale formation in the power plant circulating water, and improves the concentration ratio of the power plant circulating water.

[0070] In summary, for the device and method for biochemical treatment of power plant circulating cooling water of the present invention, through the collaborative optimization of the device and the method, efficient biochemical treatment of power plant circulating cooling water is achieved. The integrated design of the bioreactor 2, the temperature control system 4, the aeration system 5, the dynamic dissolved oxygen measuring instrument 6, and the stirring device 7 in the device ensures the stability and efficiency of the treatment process. In the method, by adding high-efficiency bactericides and nutrients, dynamically regulating dissolved oxygen and temperature, and optimizing the mass transfer process, the concentration ratio of the circulating water is significantly increased, the scale formation problem is solved, and at the same time, the operating cost and environmental impact are reduced.

[0071] 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 described in the foregoing embodiments, or perform equivalent replacements for 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 device for biochemical treatment of circulating cooling water in a power plant, characterized in that: The invention comprises a bioreactor (2), a temperature control system (4) connected to the bioreactor (2), an aeration system (5) arranged at the bottom of the bioreactor (2), and a dynamic dissolved oxygen measuring instrument (6) and a stirring device (7) installed inside the bioreactor (2); the dynamic dissolved oxygen measuring instrument (6) is connected to the aeration system (5); and the bioreactor (2) is pre-installed with a high-efficiency bacterial agent and a nutrient agent.

2. The device for biochemical treatment of circulating cooling water in a power plant according to claim 1, characterized in that: The inlet of the bioreactor (2) is connected to a water inlet pipe (1); and the outlet of the bioreactor (2) is connected to a water outlet pipe (3).

3. A method for biochemical treatment of circulating cooling water in a power plant, characterized in that: The device for biochemical treatment of circulating cooling water of a power plant according to any one of claims 1 or 2 is used to perform biochemical treatment of circulating cooling water of a power plant, comprising the following steps: 1) Adding a highly effective bacterial agent into the bioreactor (2); 2) Adding nutrients to the bioreactor (2) according to the alkalinity, dissolved oxygen and ammonia nitrogen indicators of the power plant's circulating cooling water; 3) Pumping the circulating cooling water of the power plant into the bioreactor (2), stirring it through the stirring device (7), controlling the equilibrium dissolved oxygen concentration in the bioreactor (2) through the aeration system (5), adjusting the aeration volume through the linkage between the dynamic dissolved oxygen measuring instrument (6) and the aeration system (5), and controlling the temperature of the bioreactor (2) through the temperature control system (4); 4) Dynamically monitor water quality and microbial communities, and adjust the dosage of high-efficiency bacterial agents and nutrients.

4. The method for biochemical treatment of circulating cooling water in a power plant according to claim 3, characterized in that: In step 1), the dosage of the high-efficiency bacterial agent is not less than 1 / 50 of the reaction volume of the bioreactor (2).

5. The method for biochemical treatment of circulating cooling water in a power plant according to claim 3, characterized in that: In step 1), the highly effective 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.

6. The method for biochemical treatment of circulating cooling water in a power plant according to claim 3, characterized in that: In step 2), the nutrient agent includes, by weight, 2-5 parts of (NH4)2SO4, 1-2 parts of MgCl2·6H2O, 5-10 parts of CaCl2·H2O, 2-6 parts of KH2PO4 and 1-2 parts of C6H 12 O6.

7. The method for biochemical treatment of circulating cooling water in a power plant according to claim 3, characterized in that: In step 3), the stirring speed of the stirring device (7) is 40-120 rpm.

8. The method for biochemical treatment of circulating cooling water in a power plant according to claim 3, characterized in that: In step 3), the equilibrium dissolved oxygen concentration is controlled at 1.0-6.0 mg / L.

9. The method for biochemical treatment of circulating cooling water in a power plant according to claim 3, characterized in that: In step 3), the temperature of the bioreactor (2) is controlled at 20-40°C.

10. The method for biochemical treatment of circulating cooling water in a power plant according to claim 3, characterized in that: In step 4), the microbial community structure in the bioreactor (2) is determined by 16S rRNA.

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