Biochemical agent and method capable of realizing ultrahigh concentration ratio of industrial circulating cooling water

Abstract

The invention relates to a biochemical agent and a method capable of realizing ultrahigh concentration ratio of industrial circulating cooling water, belongs to the technical field of industrial circulating cooling water treatment, and solves the problems of low concentration ratio of circulating cooling water, high water consumption and greater environmental pollution in the prior art. The biochemical agent comprises a compound microorganism combined preparation and a compound microorganism nutrition regulator; wherein the compound microorganism combined preparation comprises nitrobacteria dry powder, bacillus subtilis dry powder, denitrifying bacteria dry powder, photosynthetic bacteria dry powder, methane bacteria dry powder, vitamin C and active enzyme; the compound microorganism nutrition regulator comprises citric acid, glucose dry powder, sodium bicarbonate, ammonium sulfate, ammonium acetate, ammonium citrate, ammonium molybdate and zinc gluconate. By adopting the biochemical agent disclosed by the invention, safe and stable operation with the ultra-high industrial circulating water concentration ratio of 10-30 times can be realized, the treatment process is green and environment-friendly, and a large amount of water resources are saved.

Description

Technical Field

[0001] The invention relates to the technical field of industrial circulating cooling water treatment, and in particular to a biochemical agent and method capable of achieving ultra-high concentration rate of industrial circulating cooling water. Background Art

[0002] In the thermal power generation industry (using coal, gas, oil, biomass, etc. as the main fuel to produce electricity), most of them use open industrial cooling water systems (heat exchange medium cooling water directly exchanges heat with the atmosphere through convection). The open circulating cooling system mainly includes heat exchangers, cooling towers, circulating water pumps and water collection tanks connected by pipes. During the use of cooling water, it is continuously circulated in the open circulating cooling water system. Calcium, magnesium and other ions in the cooling water will precipitate on the inner wall of the heat exchanger tube to form a layer of scale. As the number of cooling water cycles increases, the cooling water decreases due to evaporation, and the concentration of inorganic ions in the water increases. As the temperature gets higher and higher, scaling will become more and more serious. The thermal conductivity of scale is very poor. When scaling forms on the inner wall of the heat exchanger tube, the heat transfer efficiency of the heat exchanger will be reduced at the least. In severe cases, the heat exchanger will be blocked, the system resistance will increase, the cooling efficiency will decrease, and the normal operation of the production system will be affected. In addition, the temperature and flow rate conditions of cooling water are very suitable for the growth of bacteria and algae in the water. As the number of cooling water cycles increases, there will be more and more bacteria and algae in the water. Due to the growth of bacteria and algae, the suspended matter and colloidal sludge in the cooling water increase. The grown bacteria and algae and colloidal sludge not only affect the cooling efficiency, but also deteriorate the surface condition of metal equipment and accelerate the corrosion of metal equipment.

[0003] In order to reduce the scaling of calcium and magnesium ions on the inner wall of the heat exchanger tube and reduce the growth of bacteria and algae in the cooling water, cooling water treatment agents should be added to the cooling water during the operation of the open circulating cooling water system. The cooling water treatment agents include scale inhibitors, bactericides and algaecides and corrosion inhibitors. In the prior art, the scale inhibitors in the cooling water treatment agents include polyphosphates, organic phosphoric acid, polyol phosphonates, polycarboxylic acid homopolymers and copolymers, etc., the bactericides and algaecides include chlorine, hypochlorite, chlorinated isocyanuric acid, chlorine dioxide, ozone, bromine and bromide, etc., the non-oxidizing biocides include chlorophenols, organic tin compounds, quaternary ammonium salts, organic amines, organic sulfides, copper salts and isothiazolinium copper, etc., and the corrosion inhibitors include silicates, phosphates, polyphosphates, organic polyphosphonic acids, ferrous sulfate, etc. The above cooling water treatment agents are all chemical drugs.

[0004] In the multiple cycles of cooling water, the inorganic ions and organic substances in the cooling water will be concentrated. As the number of cycles increases, the concentration of inorganic ions and organic substances in the cooling water will be a certain multiple higher than that in the cooling water supplementary water, becoming concentrated cooling water. The ratio of the concentration of inorganic ions and organic substances in the circulating cooling water to that of the supplementary water is usually called the concentration ratio of the circulating cooling water. In actual production, the content or parameter of a relatively stable substance in the circulating cooling water (such as chloride ion (Cl-), conductivity (DD), potassium ion (K+), hardness (YD), etc.) is used as the concentration ratio of the circulating cooling water. After the cooling water is used for multiple cycles, chemical treatment agents will also accumulate in the cooling water.

[0005] When the concentration ratio of circulating cooling water reaches a certain level, it will greatly affect the cooling efficiency of circulating cooling water and the safety of thermal system equipment. In order to restore the cooling efficiency of circulating cooling water and the safety of thermal system equipment, it is necessary to discharge a certain amount of concentrated cooling water and then replenish the corresponding amount of cooling water supplementary water. Obviously, the smaller the concentration ratio, the greater the amount of discharged water, and the greater the amount of supplementary water used. The above-mentioned cooling water supplementary water can be surface water, groundwater, tap water or urban recycled water.

[0006] The above-mentioned use of chemicals as water treatment agents for the industrial circulating cooling water system of the thermal power industry has high treatment costs and poor treatment effects. The circulating cooling water concentration rate can only be between 2.5 and 4.0 times, resulting in large drainage and water consumption. The discharged water also contains a large amount of chemical treatment agents, which pollutes the environment. Summary of the invention

[0007] In view of the above analysis, the present invention aims to provide a biochemical agent and method that can achieve ultra-high concentration ratio of industrial circulating cooling water, so as to solve the problems of low concentration ratio, large water consumption and serious environmental pollution of circulating cooling water treated by existing cooling water treatment agents.

[0008] On the one hand, the present invention provides a biochemical agent that can achieve ultra-high concentration rate of industrial circulating cooling water, the biochemical agent comprising a composite microbial combined preparation and a composite microbial nutrient regulator; wherein the composite microbial combined preparation comprises nitrifying bacteria dry powder, Bacillus subtilis dry powder, denitrifying bacteria dry powder, photosynthetic bacteria dry powder, methane bacteria dry powder, vitamin C and active enzymes; the composite microbial nutrient regulator comprises citric acid, glucose powder, sodium bicarbonate, ammonium sulfate, ammonium acetate, ammonium citrate, ammonium molybdate and zinc gluconate.

[0009] Exemplarily, the weight proportions of the components in the composite microbial combined preparation are: 30-50 parts of nitrifying bacteria dry powder, 10-20 parts of Bacillus subtilis dry powder, 20-30 parts of denitrifying bacteria dry powder, 5-10 parts of photosynthetic bacteria dry powder, 1-10 parts of methane bacteria dry powder, 5-10 parts of vitamin C, and 1-5 parts of active enzymes; The weight proportions of the components in the composite microbial nutrition regulator are: 20-50 parts of citric acid, 20-30 parts of glucose powder, 0-50 parts of sodium bicarbonate, 10-40 parts of ammonium sulfate, 10-20 parts of ammonium acetate, 1-20 parts of ammonium citrate, 1-5 parts of ammonium molybdate and 1-20 parts of zinc gluconate.

[0010] Exemplarily, the active enzyme is at least one of protease, lipase and cellulase.

[0011] In a second aspect, the present invention also provides a method for ultra-high concentration treatment of circulating cooling water that can achieve ultra-high concentration ratios of industrial circulating cooling water, using the above-mentioned biochemical agent that can achieve ultra-high concentration ratios of industrial circulating cooling water, the method comprising: Step (1): mixing the cooling water supplementary water with the biochemical agent to prepare cooling water containing a composite microbial combination preparation and a composite microbial nutrient regulator; the main function of this step is to construct a beneficial microbial ecological system in the circulating water system, and add beneficial microorganisms and life nutrient metabolic substances required by the series of microorganisms.

[0012] Step (2): The cooling water containing the composite microbial combined preparation and the composite microbial nutrient regulator enters the circulating cooling water system and becomes circulating cooling water, and the composite microbial nutrient regulator is added to the circulating cooling water. This step provides a corresponding amount of nutrient metabolites to the constructed circulating water beneficial microbial system to meet the life metabolic activities of various beneficial microbial groups in the circulating water system, thereby regulating the artificial control of stable circulating water quality indicators.

[0013] Step (3): adding a composite microbial combined preparation to the circulating cooling water; this step is to supplement the beneficial microbial population in the circulating water system when the population is insufficient, so as to meet the minimum demand guarantee of the beneficial microbial population in the circulating water system for regulating the water quality of the circulating water.

[0014] Step (4): After the concentration ratio of the circulating cooling water treated in step (2) or step (3) reaches 10 to 30 times, a portion of the circulating concentrated cooling water is discharged from the circulating cooling water system; (5) Steps (1) to (4) are repeated for monitoring and operation.

[0015] Exemplarily, in step (1), the pH of the cooling water supplement water is 6.0-8.5.

[0016] Exemplarily, in step (1), the mass ratio of the composite microbial combination preparation to the cooling water supplement water is 1:10000-300000, the mass ratio of the composite microbial nutrient regulator to the cooling water supplement water is 1:1000-20000, and the mass ratio of the composite microbial combination preparation to the composite microbial nutrient regulator is 1:100-500. Exemplarily, in step (2), the amount and frequency of adding the composite microbial nutrient regulator to the circulating cooling water make the pH value of the circulating cooling water 7.5-8.2.

[0017] It should be noted that the timing of adding the composite microbial nutrient regulator in step (2) can be determined by regularly monitoring the pH value of the circulating cooling water.

[0018] When the pH value of the circulating cooling water is maintained at 7.5~8.2, it can effectively prevent scaling and corrosion of the equipment, prevent the generation of large amounts of microbial sludge, and avoid excessive harmful microorganisms, thereby ensuring the stability of the circulating cooling water system.

[0019] Illustratively, in step (2), the mass ratio of the composite microbial nutrient regulator added to the circulating cooling water to the circulating cooling water is 1:1000-20000, and the frequency of adding the composite microbial nutrient regulator to the circulating cooling water is 0-2 times / day.

[0020] Illustratively, in step (3), the frequency of adding the composite microbial combination preparation to the circulating cooling water is determined according to the sensitivity of the composite microbial combination preparation to the composite microbial nutrient regulator.

[0021] It should be noted that the sensitivity of the composite microbial preparation to the composite microbial nutrient regulator is that the pH value of the circulating cooling water is adjusted to 7.5-8.2 within 2 to 6 hours after the composite microbial nutrient regulator is added. It should be further noted that in order to adjust the pH value in time, the composite microbial preparation is added when the pH value is close to 8.2 (for example, the pH value is 8.17, 8.18, 8.19, 8.20).

[0022] Exemplarily, in step (3), the frequency of adding the composite microbial combination preparation is 0 to 2 times per day.

[0023] Exemplarily, the mass ratio of the composite microbial combination preparation added to the circulating cooling water in step (3) to the composite microbial nutrient regulator added to the circulating cooling water in step (2) is 1:100-500.

[0024] Exemplarily, in step (4), the amount of concentrated cooling water discharged is 0.01% to 0.25% per hour of the weight of the concentrated cooling water in the open circulating cooling water system.

[0025] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects: The present invention uses composite microbial preparations and composite microbial nutrient regulators as water treatment agents. The open industrial circulating water biochemical treatment technology mainly confirms the circulating water biochemical treatment operation control parameters based on the water quality of circulating cooling water supplementary water and the material of the equipment. The present invention allows the circulating cooling water to build a microbial dynamic circulation ecological balance system by itself (through ecological influences such as nutrient competition, mutualism, antagonism, and predation), inhibit the growth of harmful microorganisms, and metabolize to produce biochemical substances with natural scale and corrosion inhibition effects, thereby stabilizing and controlling the water quality of the circulating cooling water (mainly pH value and alkalinity indicators), and raising the circulating water concentration rate to a new height. Through the natural regulation of ecological balance by microorganisms in the open industrial circulating water system of the thermal power plant, the scaling, corrosion, and large-scale growth of bacteria and algae sludge in the industrial circulating water can be controlled without adding water treatment chemicals such as scale inhibitors, acids, corrosion inhibitors, and bactericides and algaecides. The comprehensive cost of the method of the present invention is low and the treatment effect is good. At the same time, it can achieve ultra-high industrial circulating water concentration rates of 10 to 30 times in the open industrial circulating water system of thermal power plants for safe and stable operation. The treatment process is green and environmentally friendly, and a large amount of water resources can be saved (compared with existing technologies, 20% to 30% water can be saved). The discharged wastewater does not contain polluting chemicals, there is no secondary pollution, and the environment is protected. It is a concrete manifestation of today's green and sustainable development, environmentally friendly development, and scientific development models in the field of industrial water treatment in the thermal power industry.

[0026] In practical applications, based on the inherent characteristics of the open circulating cooling water system, water droplet entrainment, water leakage, etc. will inevitably occur during the operation of the circulating cooling water. Based on this inevitable drainage phenomenon, the use of the biochemical agent and water treatment method of the present invention basically does not require an additional special drainage system, and basically achieves near-zero discharge of industrial circulating water, reduces energy consumption of non-renewable resources and petrochemical resources, and effectively ensures the water-saving, emission reduction, and environmental protection goals of the thermal power industry.

[0027] In the present invention, the above-mentioned technical solutions can also be combined with each other to achieve more preferred combination solutions. Other features and advantages of the present invention will be described in the subsequent description, and some advantages can become obvious from the description, or can be understood by practicing the present invention. The purpose and other advantages of the present invention can be achieved and obtained through the contents particularly pointed out in the description. DETAILED DESCRIPTION

[0028] The biochemical agent and method for achieving ultra-high concentration rate of industrial circulating cooling water of the present invention are further described below through specific examples.

[0029] In the following examples, the raw materials of the biochemical agents are derived from: Nitrifying bacteria dry powder, Bacillus subtilis dry powder and denitrifying bacteria dry powder are produced by Cangzhou Wangfa Biotechnology Research Institute Co., Ltd.

[0030] The photosynthetic bacteria dry powder was produced by Jiangsu Greentech Biotechnology Co., Ltd.

[0031] Methane bacteria dry powder is produced by Shandong Sukehan Bioengineering Co., Ltd.

[0032] Vitamin C, sodium bicarbonate, glucose powder, ammonium sulfate, active enzyme, ammonium citrate, ammonium molybdate, and zinc gluconate are produced by Sinopharm Chemical Reagent Co., Ltd.

[0033] Example 1 This example provides a biochemical agent capable of achieving ultra-high concentration ratio of open industrial circulating cooling water and a method for ultra-high concentration treatment of circulating cooling water.

[0034] The biochemical agent is composed of a composite microbial preparation and a composite microbial nutrient regulator. The composite microbial preparation contains 40 parts of nitrifying bacteria dry powder, 15 parts of Bacillus subtilis dry powder, 25 parts of denitrifying bacteria dry powder, 10 parts of photosynthetic bacteria dry powder, 5 parts of methane bacteria dry powder, 3 parts of vitamin C, and 2 parts of active enzymes (a composite of protease, lipase and cellulase); the composite microbial nutrient regulator contains 30 parts of citric acid, 25 parts of glucose dry powder, 1 part of sodium bicarbonate, 20 parts of ammonium sulfate, 10 parts of ammonium acetate, 10 parts of ammonium citrate, 1 part of ammonium molybdate, and 3 parts of zinc gluconate.

[0035] The method for ultra-high concentration treatment of circulating cooling water using the above-mentioned biochemical agent includes: (1) First, the make-up water of cooling water is charged into the open circulating cooling water system, the pH value of the make-up water of cooling water is 6.0-8.5, and the composite microbial combined preparation and the composite microbial nutrient regulator are added to the make-up water of cooling water to obtain cooling water containing the composite microbial combined preparation and the composite microbial nutrient regulator; the mass ratio of the composite microbial preparation to the make-up water of cooling water is 1:200000, the mass ratio of the composite microbial nutrient regulator to the make-up water of cooling water is 1:1000, and the mass ratio of the composite microbial combined preparation to the composite microbial nutrient regulator is 1:200; (2) The cooling water obtained in step (1) is circulating cooling water during the circulation process, and a composite microbial nutrient regulator is added to the circulating cooling water. The amount and frequency of adding the composite microbial nutrient regulator to the circulating cooling water are such that the pH value of the circulating cooling water is 7.75, the mass ratio of the composite microbial nutrient regulator to the circulating cooling water is 1:1000, and the frequency of adding the composite microbial nutrient regulator is once a day; (3) Based on the sensitivity of the composite microbial combination preparation to the composite microbial nutrient regulator, that is, after the addition of the composite microbial nutrient regulator, the pH value of the circulating cooling water drops from 8.20 to 7.75 within 2 to 6 hours, the composite microbial preparation is further added to the circulating cooling water of step (2) at a compounding ratio of 1:200 of the composite microbial combination preparation to the composite microbial nutrient regulator, and the frequency of addition is once every 300 days; (4) After the concentration ratio of the circulating cooling water in step (2) or (3) reaches 10-30 times, it is ultra-high ratio concentrated cooling water, and 0.03% / hour of the ultra-high ratio concentrated cooling water is discharged from the open circulating cooling water system, and a corresponding amount of cooling water is added to the open circulating cooling water system; (5) The supplementary water of step (4) is further added with the composite microbial combination preparation and the composite microbial nutrient regulator according to step (1) to obtain cooling water containing the composite microbial combination preparation and the composite microbial nutrient regulator, and steps (2) to (4) are repeated. The concentration ratio of the open circulating cooling water applicable to this embodiment can reach 10 times.

[0036] In the method of this embodiment, scaling condition: there is no obvious scaling in the heat exchange tube, and it is as bright as before; corrosion condition: there is no obvious corrosion mark in the heat exchange tube; microbial slime condition: there is no obvious biological slime adhesion in the heat exchange tube.

[0037] Example 2 This example provides a biochemical agent capable of achieving ultra-high concentration ratio of open industrial circulating cooling water and a method for ultra-high concentration treatment of circulating cooling water.

[0038] The biochemical agent is composed of a composite microbial preparation and a composite microbial nutrient regulator. The composite microbial preparation contains 35 parts of nitrifying bacteria dry powder, 20 parts of Bacillus subtilis dry powder, 20 parts of denitrifying bacteria dry powder, 5 parts of photosynthetic bacteria dry powder, 10 parts of methane bacteria dry powder, 5 parts of vitamin C, and 5 parts of active enzymes (protease, lipase, cellulase complex); the composite microbial nutrient regulator contains 25 parts of citric acid, 20 parts of glucose dry powder, 5 parts of sodium bicarbonate, 30 parts of ammonium sulfate, 2 parts of ammonium acetate, 15 parts of ammonium citrate, 1 part of ammonium molybdate, and 2 parts of zinc gluconate.

[0039] The method for ultra-high concentration treatment of circulating cooling water using the above-mentioned biochemical agent includes: 1) First, the make-up water of cooling water is charged into the open circulating cooling water system, the pH value of the make-up water of cooling water = 6.0~8.5, and the composite microbial combined preparation and the composite microbial nutrient regulator are added to the make-up water of cooling water to obtain cooling water containing the composite microbial combined preparation and the composite microbial nutrient regulator; the mass ratio of the composite microbial preparation to the make-up water of cooling water is 1:300000, the mass ratio of the composite microbial nutrient regulator to the make-up water of cooling water is 1:3000, and the mass ratio of the composite microbial combined preparation to the composite microbial nutrient regulator is 1:100; (2) The cooling water obtained in step (1) is circulating cooling water during the circulation process, and a composite microbial nutrient regulator is added to the circulating cooling water. The amount and frequency of adding the composite microbial nutrient regulator to the circulating cooling water are such that the pH value of the circulating cooling water is 7.82, the mass ratio of the composite microbial nutrient regulator to the circulating cooling water is 1:300, and the frequency of adding the composite microbial nutrient regulator is 2 times / day; (3) Based on the sensitivity of the composite microbial combination preparation to the composite microbial nutrient regulator, that is, after the addition of the composite microbial nutrient regulator, the pH value of the circulating cooling water drops from 8.19 to 7.55 within 2 to 6 hours, the composite microbial preparation is further added to the circulating cooling water of step (2) at a compounding ratio of 1:100 of the composite microbial combination preparation to the composite microbial nutrient regulator, and the frequency of addition is once every 200 days; (4) After the concentration ratio of the circulating cooling water in step (2) or (3) reaches 10-30 times, it is ultra-high ratio concentrated cooling water, and 0.01% / hour of the ultra-high ratio concentrated cooling water is discharged from the open circulating cooling water system, and a corresponding amount of cooling water is added to the open circulating cooling water system; (5) The supplementary water of step (4) is further added with the composite microbial combination preparation and the composite microbial nutrient regulator according to step (1) to obtain cooling water containing the composite microbial combination preparation and the composite microbial nutrient regulator, and steps (2) to (4) are repeated. The concentration ratio of the open circulating cooling water applicable to this embodiment can reach 30 times.

[0040] In the method of this embodiment, scaling condition: there is no obvious scaling in the heat exchange tube, and it is as bright as before; corrosion condition: there is no obvious corrosion mark in the heat exchange tube and the end plate; microbial slime condition: there is no obvious biological slime adhesion in the heat exchange tube.

[0041] Example 3 This example provides a biochemical agent capable of achieving ultra-high concentration ratio of open industrial circulating cooling water and a method for ultra-high concentration treatment of circulating cooling water.

[0042] The biochemical agent is composed of a composite microbial preparation and a composite microbial nutrient regulator. The composite microbial preparation contains 31 parts of nitrifying bacteria dry powder, 18 parts of Bacillus subtilis dry powder, 24 parts of denitrifying bacteria dry powder, 8 parts of photosynthetic bacteria dry powder, 7 parts of methane bacteria dry powder, 7 parts of vitamin C, and 5 parts of active enzymes (protease, lipase, cellulase complex); the composite microbial nutrient regulator contains 23 parts of citric acid, 22 parts of glucose dry powder, 3 parts of sodium bicarbonate, 32 parts of ammonium sulfate, 1 part of ammonium acetate, 16 parts of ammonium citrate, 1 part of ammonium molybdate, and 2 parts of zinc gluconate.

[0043] The method for ultra-high concentration treatment of circulating cooling water using the above-mentioned biochemical agent includes: (1) First, the make-up water of cooling water is charged into the open circulating cooling water system, the pH value of the make-up water of cooling water is 6.0-8.5, and the composite microbial combined preparation and the composite microbial nutrient regulator are added to the make-up water of cooling water to obtain cooling water containing the composite microbial combined preparation and the composite microbial nutrient regulator; the mass ratio of the composite microbial preparation to the make-up water of cooling water is 1:150000, the mass ratio of the composite microbial nutrient regulator to the make-up water of cooling water is 1:600, and the mass ratio of the composite microbial combined preparation to the composite microbial nutrient regulator is 1:250; (2) The cooling water prepared in step 1) is circulating cooling water during the circulation process, and a composite microbial nutrient regulator is added to the circulating cooling water. The amount and frequency of adding the composite microbial nutrient regulator to the circulating cooling water are such that the pH value of the circulating cooling water is 8.02, the mass ratio of the composite microbial nutrient regulator to the circulating cooling water is 1:600, and the frequency of adding the composite microbial nutrient regulator is once per day; (3) Based on the sensitivity of the composite microbial combination preparation to the composite microbial nutrient regulator, that is, after the addition of the composite microbial nutrient regulator, the pH value of the circulating cooling water decreases from 8.18 to 7.65 within 2 to 6 hours, the composite microbial preparation is further added to the circulating cooling water of step (2) according to the composite microbial combination preparation and the composite microbial nutrient regulator in a mass ratio of 1:250, and the frequency of addition is once / 280 days; (4) After the concentration ratio of the circulating cooling water in step (2) or (3) reaches 10 to 30 times, it is ultra-high ratio concentrated cooling water, and 0.02% / hour of the ultra-high ratio concentrated cooling water is discharged from the open circulating cooling water system, and a corresponding amount of cooling water is added to the open circulating cooling water system; (5) The supplementary water of step (4) is then added with the composite microbial combination preparation and the composite microbial nutrient regulator according to step (1) to obtain cooling water containing the composite microbial combination preparation and the composite microbial nutrient regulator, and steps (2) to (4) are repeated. The concentration ratio of the open circulating cooling water applicable to this embodiment can reach 18 times.

[0044] In the method of this embodiment, scaling condition: there is no obvious scaling in the heat exchange tube, and it is as bright as before; corrosion condition: there is no obvious corrosion mark in the heat exchange tube and the end plate; microbial slime condition: there is no obvious biological slime adhesion in the heat exchange tube.

[0045] Example 4 This example provides a biochemical agent capable of achieving ultra-high concentration ratio of open industrial circulating cooling water and a method for ultra-high concentration treatment of circulating cooling water.

[0046] The biochemical agent is composed of a composite microbial preparation and a composite microbial nutrient regulator. The composite microbial preparation contains 33 parts of nitrifying bacteria dry powder, 19 parts of Bacillus subtilis dry powder, 25 parts of denitrifying bacteria dry powder, 6 parts of photosynthetic bacteria dry powder, 9 parts of methane bacteria dry powder, 4 parts of vitamin C, and 4 parts of active enzymes (protease, lipase, cellulase complex); the composite microbial nutrient regulator contains 28 parts of citric acid, 23 parts of glucose dry powder, 2 parts of sodium bicarbonate, 26 parts of ammonium sulfate, 2 parts of ammonium acetate, 17 parts of ammonium citrate, 1 part of ammonium molybdate, and 1 part of zinc gluconate.

[0047] The method for ultra-high concentration treatment of circulating cooling water using the above-mentioned biochemical agent includes: (1) First, the make-up water of cooling water is charged into the open circulating cooling water system, the pH value of the make-up water of cooling water is 6.0-8.5, and the composite microbial combined preparation and the composite microbial nutrient regulator are added to the make-up water of cooling water to obtain cooling water containing the composite microbial combined preparation and the composite microbial nutrient regulator; the mass ratio of the composite microbial preparation to the make-up water of cooling water is 1:210000, the mass ratio of the composite microbial nutrient regulator to the make-up water of cooling water is 1:700, and the mass ratio of the composite microbial combined preparation to the composite microbial nutrient regulator is 1:300; (2) The cooling water obtained in step (1) is circulating cooling water during the circulation process, and a composite microbial nutrient regulator is added to the circulating cooling water. The amount and frequency of adding the composite microbial nutrient regulator to the circulating cooling water are such that the pH value of the circulating cooling water is 7.98, the mass ratio of the composite microbial nutrient regulator to the circulating cooling water is 1:1000, and the frequency of adding the composite microbial nutrient regulator is once every two days; (3) Based on the sensitivity of the composite microbial combination preparation to the composite microbial nutrient regulator, that is, after the addition of the composite microbial nutrient regulator, the pH value of the circulating cooling water decreases from 8.17 to 7.58 within 2 to 6 hours, the composite microbial preparation is further added to the circulating cooling water of step (2) at a compounding ratio of 1:300 of the composite microbial combination preparation to the composite microbial nutrient regulator, and the frequency of addition is once every 300 days; (4) After the concentration ratio of the circulating cooling water in step (2) or (3) reaches 10 to 30 times, it is ultra-high ratio concentrated cooling water, and 0.25% / hour of concentrated cooling water is discharged from the open circulating cooling water system, and a corresponding amount of cooling water is added to the open circulating cooling water system; (5) The supplementary water of step (4) is further added with the composite microbial combination preparation and the composite microbial nutrient regulator according to step (1) to obtain cooling water containing the composite microbial combination preparation and the composite microbial nutrient regulator, and steps (2) to (4) are repeated. The concentration ratio of the open circulating cooling water applicable to this embodiment can reach 15 times.

[0048] In the method of this embodiment, scaling condition: there is no obvious scaling in the heat exchange tube, and it is as bright as before; corrosion condition: there is no obvious corrosion mark in the heat exchange tube and the end plate; microbial slime condition: there is no obvious biological slime adhesion in the heat exchange tube.

[0049] Comparative Example 1 This comparative example provides a conventional method for treating circulating cooling water.

[0050] 1. Composition of circulating water chemical agents: circulating water scale inhibitor and corrosion inhibitor (complex of organic phosphonic acid and carboxylic acid copolymer), bactericide and algaecide (diquaternary ammonium salt, monochloride).

[0051] 2. Method of adding chemical agents to circulating water: scale inhibitor and corrosion inhibitor for circulating water (5ppm or 5mg / kg according to the circulating water replenishment volume); bactericide and algaecide diquaternary ammonium salt is added once every 15 days (100ppm or 100mg / kg according to the circulating water system's retained water volume, and bactericide and algaecide chloramine is added continuously (0.5ppm or 0.5mg / kg according to the circulating water system's retained water volume); 3. Circulating water treatment effect: During the period, the circulating water concentration ratio is controlled to fluctuate between 3.0-4.0 (controlled by circulating water drainage); there is no obvious scaling in the circulating water heat exchange tube; there is no obvious corrosion mark in the circulating water heat exchange tube and the end plate; there is no obvious sticky biological sludge adhesion in the circulating water heat exchange tube.

[0052] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention.

Claims

1. A biochemical agent capable of achieving ultra-high concentration rate of industrial circulating cooling water, characterized in that: The biochemical agent includes a composite microbial combined preparation and a composite microbial nutritional regulator; wherein the composite microbial combined preparation includes nitrifying bacteria dry powder, Bacillus subtilis dry powder, denitrifying bacteria dry powder, photosynthetic bacteria dry powder, methane bacteria dry powder, vitamin C and active enzymes; the composite microbial nutritional regulator includes citric acid, glucose powder, sodium bicarbonate, ammonium sulfate, ammonium acetate, ammonium citrate, ammonium molybdate and zinc gluconate.

2. The biochemical agent according to claim 1, characterized in that The weight proportions of the components in the composite microbial combined preparation are: 30-50 parts of nitrifying bacteria dry powder, 10-20 parts of Bacillus subtilis dry powder, 20-30 parts of denitrifying bacteria dry powder, 5-10 parts of photosynthetic bacteria dry powder, 1-10 parts of methane bacteria dry powder, 5-10 parts of vitamin C, and 1-5 parts of active enzyme; The weight proportions of the components in the composite microbial nutrition regulator are: 20-50 parts of citric acid, 20-30 parts of glucose powder, 0-50 parts of sodium bicarbonate, 10-40 parts of ammonium sulfate, 10-20 parts of ammonium acetate, 1-20 parts of ammonium citrate, 1-5 parts of ammonium molybdate and 1-20 parts of zinc gluconate.

3. The biochemical agent according to claim 1, characterized in that The active enzyme is at least one of protease, lipase and cellulase.

4. A method for ultra-high concentration of circulating cooling water capable of achieving ultra-high concentration ratio of industrial circulating cooling water, characterized in that: Using the biochemical agent capable of achieving ultra-high concentration rate of industrial circulating cooling water as described in any one of claims 1 to 3, the method comprises: Step (1): mixing the supplementary water of cooling water with the biochemical agent to prepare cooling water containing the composite microbial combined preparation and the composite microbial nutrient regulator; Step (2): the cooling water containing the composite microbial combined preparation and the composite microbial nutrient regulator enters the circulating cooling water system to become circulating cooling water, and the composite microbial nutrient regulator is added to the circulating cooling water; Step (3): adding a composite microbial combination preparation to the circulating cooling water; Step (4): after the concentration ratio of the circulating cooling water treated in step (2) or step (3) reaches 10 to 30 times, a portion of the circulating concentrated cooling water is discharged from the circulating cooling water system; (5) Repeat steps (1) to (4) to perform monitoring and operation.

5. The method according to claim 4, characterized in that In step (1), the pH of the cooling water supplement water is 6.0-8.

5.

6. The method according to claim 4 or 5, characterized in that: In step (1), the mass ratio of the composite microbial combination preparation to the cooling water supplement water is 1:10000-300000, the mass ratio of the composite microbial nutrient regulator to the cooling water supplement water is 1:1000-20000, and the mass ratio of the composite microbial combination preparation to the composite microbial nutrient regulator is 1:100-500.

7. The method according to claim 4, characterized in that In step (2), the amount and frequency of adding the composite microbial nutrient regulator to the circulating cooling water are such that the pH value of the circulating cooling water is 7.5-8.

2.

8. The method according to claim 7, characterized in that In step (2), the mass ratio of the composite microbial nutrient regulator added to the circulating cooling water to the circulating cooling water is 1:1000-20000, and the frequency of adding the composite microbial nutrient regulator to the circulating cooling water is 0-2 times / day.

9. The method according to claim 4, characterized in that In step (3), the frequency of adding the composite microbial combination preparation to the circulating cooling water is determined according to the sensitivity of the composite microbial combination preparation to the composite microbial nutrient regulator.

10. The method according to claim 4 or 9, characterized in that: The mass ratio of the composite microbial combined preparation added to the circulating cooling water in step (3) to the composite microbial nutrient regulator added to the circulating cooling water in step (2) is 1:100-500.