CN109399795B - System for treating circulating cooling water, application thereof and method for treating circulating cooling water - Google Patents
System for treating circulating cooling water, application thereof and method for treating circulating cooling water Download PDFInfo
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- CN109399795B CN109399795B CN201710695324.5A CN201710695324A CN109399795B CN 109399795 B CN109399795 B CN 109399795B CN 201710695324 A CN201710695324 A CN 201710695324A CN 109399795 B CN109399795 B CN 109399795B
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/32—Biological treatment of water, waste water, or sewage characterised by the animals or plants used, e.g. algae
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F3/00—Biological treatment of water, waste water, or sewage
- C02F3/34—Biological treatment of water, waste water, or sewage characterised by the microorganisms used
- C02F3/348—Biological treatment of water, waste water, or sewage characterised by the microorganisms used characterised by the way or the form in which the microorganisms are added or dosed
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
- C02F2103/02—Non-contaminated water, e.g. for industrial water supply
- C02F2103/023—Water in cooling circuits
Abstract
The invention relates to the field of circulating cooling water, and relates to a system for treating circulating cooling water, application thereof and a method for treating circulating cooling water. Specifically, the system of the present invention comprises an ecological floating island, acid forming bacteria, autotrophic microorganisms, and optionally an oxygen consuming agent. When the system provided by the invention is used for circulating cooling water treatment, the circulating cooling water supplemented with the reuse water can be kept in good water quality, and the heat exchange tubes in the circulating cooling water system are kept to have lower corrosion rate and adhesion rate. Meanwhile, the system used by the invention mainly adopts biological agents, and has the advantages of environmental protection. In addition, the system provided by the invention can be directly applied to the existing circulating cooling water system without additionally increasing advanced treatment equipment, thereby greatly reducing the treatment cost.
Description
Technical Field
The invention relates to the field of circulating cooling water, in particular to a system for treating circulating cooling water, application thereof and a method for treating circulating cooling water.
Background
In the operation process of an industrial circulating cooling water system, circulating water is continuously concentrated due to the conditions of water evaporation, wind blowing loss and the like, the concentration of anions and cations contained in the circulating water is increased, the pH value is changed, the water quality is deteriorated, corrosion or scaling is caused, the temperature, the pH value and the nutrient content of the circulating water are favorable for the propagation of microorganisms, and sufficient sunlight irradiation on a cooling tower is an ideal place for the growth of algae. With the increasing shortage of water resources, water conservation is more and more regarded by various industrial enterprises, and the water supplement of circulating cooling water is as high as 70% of industrial water, so more and more industrial enterprises try to adopt reuse water (treated domestic sewage or industrial wastewater) as the water supplement or partial water supplement of circulating water, and a large amount of anions, cations, reducing organic matters, nitrogen, phosphorus and the like enter the circulating water along with the reuse water, so that the deterioration of water quality is accelerated, corrosion or scaling and the breeding of biological slime and algae are promoted, and the proportion of the reuse water in the water supplement is low.
CN204550259U provides a system for making up water as power plant recirculated cooling water, including former pond, depositing reservoir, plug-flow chlorine contact ditch, variable pore filter and clean water basin that communicate in proper order, the input of depositing reservoir is linked together with coagulant injection device, the input of plug-flow chlorine contact ditch is linked together with sulphuric acid injection device and germicide injection device respectively, the injection end of former pond is linked together with city second grade sewage raceway, the output of clean water basin is linked together with recirculated cooling water make-up water system.
CN203474601U discloses a water treatment system, including the distribution tank that can let in city normal water, its characterized in that the distribution tank intercommunication have the biological fluidization pond of aeration, the biological fluidization pond of aeration communicates there is middle pond, middle pond through the middle elevator pump in the pond, pipeline intercommunication has the pipeline mixer, the pipeline mixer communicates there is the clarification tank through the pipeline, the play water connection recirculated cooling water system of clarification tank.
CN104230015A discloses a composite slow-release scale inhibitor suitable for a petrochemical sewage reuse circulating water system, which consists of 2-phosphobutane-1, 2, 4-tricarboxylic acid, hydroxyethylidene diphosphonic acid, amino trimethylene phosphonic acid and zinc sulfate.
CN101921022A discloses a scale and corrosion inhibitor for recycled water used as circulating cooling water of a thermal power plant, which comprises two groups of materials: the material of group 1 comprises organic phosphonate, polycarboxylic acid multipolymer, zinc salt and water, wherein the water is a solvent; group 2 materials include copper corrosion inhibitors; and the two groups of materials are independently subpackaged.
CN102351325A discloses a scale and corrosion inhibitor for reclaimed water reuse, which comprises the following raw material components: deionized water, polycarboxylic acid, phosphonic carboxylic acid, sodium molybdate, zinc salt and copper corrosion inhibitor.
CN101423300 discloses a scale and corrosion inhibitor suitable for a reclaimed water recycling system, which is a scale and corrosion inhibitor prepared by compounding polyepoxysuccinic acid, 2-phosphonic acid butane 1,2, 4-tricarboxylic acid, C6-C24 fatty amine and a non-ionic surfactant in a mass ratio of 1: 1.0-2.0: 0.5-1.0: 1.0-2.0 in sequence.
Therefore, the treatment of the circulating water taking the reuse water as the water supplement at present is mainly focused on two aspects, one is the advanced treatment of the reuse water before entering the circulating cooling water system, and the other is the chemical treatment of the reuse water after entering the circulating cooling water system. However, the former often requires an increase in investment in advanced treatment equipment, and the latter not only consumes a large amount of chemical agents, but also causes an environmental burden due to discharge of the circulating water blowdown water. Therefore, there is a need to find a method for treating recirculated cooling water, which can maintain good water quality of recirculated cooling water supplemented with recycled water, and is environmentally friendly and low in cost.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a system for treating circulating cooling water, an application thereof and a method for treating the circulating cooling water. When the system provided by the invention is used for circulating cooling water treatment, the circulating cooling water supplemented with the reuse water can be kept in good water quality, and the heat exchange tubes in the circulating cooling water system are kept to have lower corrosion rate and adhesion rate.
In order to achieve the above objects, in a first aspect, the present invention provides a system for treatment of recirculated cooling water, wherein the system comprises an ecological floating island, acid forming bacteria, autotrophic microorganisms and optionally an oxygen consuming agent.
In a second aspect, the invention also provides the application of the system in circulating cooling water treatment.
In a third aspect, the present invention also provides a method for treating recirculated cooling water, which comprises: and adding the ecological floating island, acid-producing bacteria, autotrophic microorganisms and optional oxygen consumption agent into the circulating cooling water system.
The system containing the ecological floating island, the acid-producing bacteria, the autotrophic microorganisms and the optional oxygen consumption agent is added into the circulating cooling water system, so that the Chemical Oxygen Demand (COD), the ammonia nitrogen content and the total phosphorus content of the circulating cooling water can be effectively reduced, and the heat exchange tube in the circulating cooling water system is kept to have lower corrosion rate and adhesion rate.
In a preferred embodiment of the invention, acid-producing bacteria and autotrophic microorganisms are added into a water collecting tank, an ecological floating island is added into the water collecting tank, and an oxygen consumption agent is added at an inlet of a circulating pump, so that the COD value of circulating cooling water can be reduced to be below 28 mg/L, the ammonia nitrogen content can be reduced to be below 2.55 mg/L, the total phosphorus content can be reduced to be below 0.95 mg/L, the corrosion rate of a heat exchange tube in a circulating cooling water system is kept to be below 0.056mm/a, and the adhesion rate is kept to be below 9.6 mm.
Meanwhile, the system used by the invention mainly takes biological agents (such as acid-producing bacteria and autotrophic microorganisms) and has the advantages of environmental protection. In addition, the system for treating the circulating cooling water can be directly applied to the existing circulating cooling water system without additionally increasing advanced treatment equipment, so that the treatment cost is greatly reduced.
Drawings
FIG. 1 is a schematic view of a recirculating cooling water system for use in the present invention.
Description of the reference numerals
A water collecting tank and B circulating pump
C heat exchanger D cooling tower
a water inlet pipeline and b water outlet pipeline
Detailed Description
The endpoints of the ranges and any values disclosed herein are not limited to the precise range or value, and such ranges or values should be understood to encompass values close to those ranges or values. For ranges of values, between the endpoints of each of the ranges and the individual points, and between the individual points may be combined with each other to give one or more new ranges of values, and these ranges of values should be considered as specifically disclosed herein.
In a first aspect, the present invention provides a system for the treatment of recirculating cooling water, wherein the system comprises an ecological floating island, acid forming bacteria, autotrophic microorganisms, and optionally an oxygen consuming agent.
In the present invention, the term "ecological floating island" refers to an ecological facility constructed by artificial design, floating on the water surface, using bamboo or synthetic polymer material as substrate or carrier, for planting higher aquatic plants or terrestrial plants, for growth, multiplication and inhabitation of animals and plants and microorganisms. The ecological floating island is not particularly limited in type, and can be a type which is conventionally used for water body purification in the field. In a preferred aspect, the ecological floating island comprises a floatable carrier and plants attached to the carrier, wherein the plants may be aquatic plants and/or modified terrestrial plants, preferably aquatic plants, more preferably one or more of reed, dambo and water hyacinth.
In the present invention, the source of the ecological floating island is not particularly limited, and for example, the ecological floating island may be prepared by itself or may be obtained by a conventional commercial method.
In the system of the invention, the total area of the ecological floating island can be selected conventionally according to the volume of the circulating water as long as the purposes of water body purification and microorganism attachment can be achieved, for example, the ecological floating island is provided so that the total area of the ecological floating island is 1-8cm relative to every L circulating cooling water2Excellence inIs selected to be 1.5-6cm2。
According to the invention, the weight ratio of the acid-producing bacteria to the autotrophic microorganisms is 1: 0.01 to 100, preferably 1: 0.01 to 50, more preferably 1: 0.05-20. The weight of the microorganisms involved in the present invention is based on the dry cell basis.
In the present invention, the content of the oxygen consuming agent may be set according to the concentration of dissolved oxygen in the circulating cooling water, and preferably, the content of the oxygen consuming agent is such that the concentration of dissolved oxygen in the circulating cooling water is 2 mg/L or less, preferably 1 mg/L or less.
According to the present invention, the term "acid producing bacteria" refers to bacteria (which are heterotrophic microorganisms) that can produce acidic substances such as organic acids, in preferred cases, the acid producing bacteria are acid producing Bacillus, for example, at least one of Bacillus (Bacillus), Clostridium (Clostridium), lysibacillus (L ysinibacillus) and Alicyclobacillus (Alicyclobacillus).
Preferably, the acid producing bacteria is selected from at least one of Bacillus coagulans (Bacillus coagulosus), Bacillus smithii (Bacillus smithii), Bacillus stearothermophilus (Bacillus stearothermophilus), Bacillus laevigatus (Bacillus laevigaticus), Bacillus racemosus (Bacillus racemosus), Bacillus balloonius (Bacillus vesiculifera), Clostridium butyricum (Clostridium butyricum), Bacillus lysimachiae (L lysinibacillus sphaericus), and Bacillus acidocaldarius (aliclidarus).
More preferably, the acid producing bacteria is selected from at least one of bacillus coagulans, bacillus stearothermophilus, bacillus lactis, bacillus butyricum, and bacillus alicyclobacillus acidocaldarius.
In the present invention, the form of the acid-producing bacteria is not particularly limited as long as it has an activity of producing an acidic substance when put into a circulating cooling water system, and for example, the form of the acid-producing bacteria may be at least one of a powder, a bacterial suspension, and an emulsion, and is preferably a powder.
In the present invention, the source of the acid-producing bacteria is not particularly limited, and for example, it can be directly obtained by a conventional commercially available means; the strain can also be obtained by conventional means and then self-amplification culture of the strain by conventional microbial culture methods.
According to the present invention, the term "autotrophic microorganism" refers to a fungus that synthesizes autologous fungi using carbon dioxide or carbonate as a main or sole carbon source and ammonium salt or nitrate as a nitrogen source.
In the present invention, the acid-producing bacteria are different from the autotrophic microorganisms.
In the present invention, the autotrophic microorganisms may be selected from at least one of nitrifying bacteria, sulfurating bacteria, and hydrogen bacteria. The term "hydrogen bacteria" refers to a type of bacteria that reduces carbon dioxide to organic substances using hydrogen as an electron donor, and thus, the hydrogen bacteria according to the present invention are autotrophic microorganisms. Preferably, the autotrophic microorganisms are nitrifying bacteria and/or sulfurating bacteria.
Preferably, the autotrophic microorganism is selected from at least one autotrophic microorganism of the genera Nitrosomonas (nitrosolomas), Nitrosospira (nitrosolspira), Nitrosococcus (Nitrosococcus), nitrosophyllus (Nitrosolobus), nitrobacter (nitrospinosa), Nitrococcus (Nitrococcus), and Thiobacillus (Thiobacillus).
More preferably, the autotrophic microorganisms are selected from at least one of Nitrosomonas europaea (nitromonas europaea), Nitrosomonas psychrophila (nitromonas crytolerans), nitrosospirillum polytype (nitromonas muliformis), Nitrosococcus oceanic (Nitrococcus oceani), nitrobacter gracilis (nitromonas fascialis), Nitrococcus mobilis (Nitrococcus mobilis), thiooxidans (Thiobacillus thiooxidans), Thiobacillus thiooxidans (Thiobacillus thioparus) and Thiobacillus denitrificans (Thiobacillus thiobifidus);
further preferably, the autotrophic microorganisms are selected from at least one of nitrosomonas europaea, nitrosospira polytype, nitrosococcus oceanic, thiobacillus thioparus and thiobacillus denitrificans.
In the present invention, the form of the autotrophic microorganisms is not particularly limited as long as it is active when put into a circulating cooling water system, and for example, the form of the autotrophic microorganisms may be at least one of a powder, a bacterial suspension and an emulsion, and preferably a powder.
In the present invention, the source of the autotrophic microorganisms is not particularly limited, and may be directly obtained by, for example, conventional commercial means; the strain can also be obtained by conventional means and then self-amplification culture of the strain by conventional microbial culture methods.
According to the present invention, the oxygen consuming agent may be various substances commonly used in the art that can reduce the oxygen content in water (or consume oxygen in water), for example, may be selected from at least one of sodium sulfite, hydrazine hydrate, and dimethylketoxime.
In a preferred embodiment of the present invention, the ecological floating island, the acid producing bacteria, the autotrophic microorganisms, and the oxygen consuming agent are each stored separately; alternatively, the acid forming bacteria and the autotrophic microorganisms are co-preserved, but they are preserved separately from the ecological floating island and the oxygen consuming agent, respectively.
In a second aspect, the invention also provides the application of the system in circulating cooling water treatment, in particular to the application in circulating cooling water treatment taking reuse water as water supplement.
In the present invention, the term "reuse water" refers to industrial wastewater or municipal sewage that is subjected to secondary treatment and advanced treatment and then supplied as reuse water.
Preferably, the reclaimed water is CaCO3Measured Ca2+The concentration is 150-300 mg/L, preferably 185-297 mg/L, as CaCO3The total hardness is 200-500 mg/L, preferably 245-468 mg/L, as CaCO3The total alkalinity is 100-200 mg/L, preferably 104-195 mg/L and Cl-Concentration of 20-200 mg/L, preferably 41-152 mg/L, COD value of 20-60 mg/L, preferably 45-56 mg/L, ammonia nitrogen content in N element of 4-6 mg/L, preferably 4.7-5.8 mg/L, and PO4 3-The total phosphorus concentration is 0.5-5 mg/L, preferably 0.9-3.6 mg/L, and pH is 6-9Preferably 8 to 8.5.
In the present invention, the total phosphorus is PO4 3-And (6) counting. Ca2+Detecting reference standard GB/T6910-2006; the total alkalinity detection refers to the standard GB/T15451-2006; the total hardness detection is referred to the standard GB/T6909-2008; cl-The concentration detection reference standard GB/T15453-2008; the pH value detection reference standard GB/T6920-1986; COD detection reference standard GB/T15456-; the detection of the ammonia nitrogen content is carried out according to the standard HG/T2158 and 2011; the total phosphorus concentration detection is referred to the standard HG/T3540-2011.
In a third aspect, the present invention also provides a method for treating recirculated cooling water, which comprises: the ecological floating island, acid-producing bacteria, autotrophic microorganisms and optional oxygen consuming agent are added into a circulating cooling water system, and preferably the circulating cooling water system takes reuse water as water supplement.
In the present invention, the definition and composition of the reuse water are as described above and will not be described herein.
In the invention, when the recirculated cooling water system takes the reuse water as the water supplement, the reuse water needs to be concentrated, and the concentration multiple is that Cl of the recirculated cooling water before water supplement-Concentration and Cl of the water supplement-The concentration ratio is 1.5-3.5: 1, preferably 1.8 to 3.2: 1.
in the method of the invention, the total area of the ecological floating island can be selected conventionally according to the volume of the circulating water as long as the purpose of water body purification can be achieved, for example, the total area of the ecological floating island is 1-8cm for every L circulating cooling water2Preferably 1.5-6cm2。
In the present invention, the ecological floating island can be used for a long period of time as long as the plants in the ecological floating island remain alive.
In the present invention, the types and compositions of the ecological floating island are as described above, and are not described herein again.
Preferably, the adding frequency of the acid-producing bacteria is once every 5-15 days, preferably once every 8-10 days, more preferably, the adding amount of the acid-producing bacteria per time is 5-500mg, preferably 10-200mg, relative to every L circulating cooling water.
Preferably, relative to every L circulating cooling water, the first adding amount of the acid-producing bacteria is more than or equal to each subsequent adding amount, preferably more than each subsequent adding amount, more preferably, the first adding amount of the acid-producing bacteria is 200-500mg, preferably 200-300mg, and each subsequent adding amount is 5-200mg, preferably 10-200 mg.
Preferably, the adding frequency of the autotrophic microorganisms is once every 5 to 15 days, preferably once every 8 to 10 days, more preferably, the adding amount of the autotrophic microorganisms is 5 to 500mg, preferably 10 to 200mg, per L circulating cooling water.
Preferably, the first adding amount of the autotrophic microorganisms is more than or equal to each subsequent adding amount, preferably more than each subsequent adding amount, relative to every L circulating cooling water, more preferably, the first adding amount of the autotrophic microorganisms is 200-200 mg, preferably 200-300mg, and each subsequent adding amount is 5-200mg, preferably 10-200 mg.
According to the invention, the oxygen consuming agent is added in such an amount that the concentration of dissolved oxygen in the recirculating cooling water is < 2 mg/L, preferably < 1 mg/L.
In the present invention, the kinds and sources of the acid-producing bacteria, the autotrophic microorganisms and the oxygen consuming agent are as described above, and thus, detailed description thereof is omitted.
In the present invention, the circulating cooling water system may be a system conventionally used in the art, for example, as shown in fig. 1, the circulating cooling water system includes: the device comprises a water collecting tank A, a circulating pump B, a heat exchanger C, a cooling tower D, a make-up water pipeline a and a sewage discharge pipeline B, wherein the water collecting tank A, the circulating pump B, the heat exchanger C and the cooling tower D are sequentially connected through pipelines. In the actual use process, circulating water in the water collecting tank A enters the heat exchanger C through the circulating pump B, the circulating water after heat exchange enters the cooling tower D, and the cooled circulating water returns to the water collecting tank A to complete a cycle. In the continuous circulation cooling process, water vapor is lost, the circulating water is continuously concentrated, the water quantity is reduced, therefore, the recycled water needs to be supplemented through the water supplementing pipeline a, and when the circulating water is concentrated to a certain degree, part of the circulating water needs to be discharged through the sewage discharge pipeline b to reduce the concentration of each ion in the circulating water.
In the preferable case, the adding position of the ecological floating island is a water collecting tank A in a circulating cooling water system; preferably, the adding position of the acid-producing bacteria is a water collecting tank A in a circulating cooling water system; more preferably, the adding position of the autotrophic microorganisms is a water collecting tank A in a circulating cooling water system; further preferably, the adding position of the oxygen consumption agent is the inlet of a circulating pump B in the circulating cooling water system (namely, the oxygen consumption agent is added into the outlet water in the water collecting tank A before the outlet water enters the circulating pump B).
In the following examples and comparative examples,
the ecological floating island is purchased from floating island planting Limited company of aquatic plants sourced from Hebei province and mainly comprises a high-density polystyrene carrier and reed;
the quality of the reuse water is shown in Table 1, wherein Ca2+The concentration, total alkalinity and total hardness are all as CaCO3Counting; the content of ammonia nitrogen is calculated by N element; total phosphorus concentration as PO4 3-And (6) counting.
Ca2+The concentration detection is referred to the standard GB/T6910-2006; the total alkalinity detection refers to the standard GB/T15451-2006; the total hardness detection is referred to the standard GB/T6909-2008; cl-The concentration detection is referred to the standard GB/T15453-2008; the pH value detection reference standard GB/T6920-1986; COD detection reference standard GB/T15456-; the detection of the ammonia nitrogen content is carried out according to the standard HG/T2158 and 2011; the total phosphorus concentration detection is referred to the standard HG/T3540-2011.
TABLE 1
To simulate the field, dynamic simulation tests were performed.The dynamic simulation test method is carried out according to the chemical industry standard HG/T2160-2008 of the people's republic of China, and the materials of the test piece and the test tube are both 20#Carbon steel.
And detecting the COD value, ammonia nitrogen content and total phosphorus concentration of the treated circulating cooling water by using a dynamic simulation test, and evaluating the corrosion rate and the adhesion rate.
Example 1
This example is for explaining the method of treating recirculated cooling water according to the present invention.
Water quality: domestic reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 2.5 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (3 cm)2/L circulating water) in a water collecting tank, adding bacillus coagulans (purchased from BNCC bacterial bank, product number BNCC337209) into the water collecting tank at an amount of 200mg of circulating water per L days, adding the bacillus coagulans once every 10 days, adding the bacillus coagulans at an amount of 100mg of circulating water per L every time, adding nitrosomonas eurotidis (purchased from BNCC bacterial bank, product number ATCC19718) into the water collecting tank at an amount of 200mg of circulating water per L days, adding the bacillus coagulans once every 10 days, adding the bacillus coagulans at an amount of 150mg of circulating water per L every time, adding sodium sulfite at an inlet of a circulating pump of a circulating water system, and keeping the dissolved oxygen concentration in the circulating water at an outlet of the heat exchanger to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation test are shown in table 2.
Example 2
This example is for explaining the method of treating recirculated cooling water according to the present invention.
Water quality: industrial reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Concentration ofRatio of (d): 2.5 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (1.5 cm)2/L circulating water) in a water collecting tank, adding Bacillus stearothermophilus (purchased from BNCC bacterial seed bank, product number BNCC336760) into the water collecting tank at an amount of 200mg per L circulating water, adding the Bacillus stearothermophilus once every 10 days, adding the Bacillus stearothermophilus at an amount of 60mg per L circulating water, adding multiple nitrosospirillum nitrosum (purchased from BNCC bacterial seed bank, product number ATCC25196) into the water collecting tank at an amount of 200mg per L circulating water, adding the Bacillus stearothermophilus once every 10 days, adding the Nitrospira nitrosum at an amount of 100mg per L circulating water, adding hydrazine hydrate at an inlet of a circulating pump of a circulating water system, and keeping the dissolved oxygen concentration in the circulating water at an outlet of a heat exchanger to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
Example 3
This example is for explaining the method of treating recirculated cooling water according to the present invention.
Water quality: domestic reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 2 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (6 cm)2/L circulating water) in a water collecting tank, adding L-lactic acid bacillus (purchased from Beijing Beina institute of biotechnology and Biotechnology, Cat. No. CICC10331) in an amount of 200mg of circulating water every L days, adding the L-lactic acid bacillus once every 10 days, wherein the adding amount is 150mg of circulating water every L, adding marine nitrosococcus (purchased from BNCC bacterial bank, Cat. No. ATCC19707) in the water collecting tank, wherein the adding amount is 200mg of circulating water every L, adding the L-lactic acid bacillus once every 10 days, wherein the adding amount is 60mg of circulating water every L, and adding the circulating water in a circulating pump of a circulating water systemDimethyl ketoxime is added at the inlet of the heat exchanger, and the concentration of dissolved oxygen in circulating water at the outlet of the heat exchanger is kept to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
Example 4
This example is for explaining the method of treating recirculated cooling water according to the present invention.
Water quality: industrial reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 2 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (3 cm)2L circulating water) is placed in a water collecting tank, clostridium butyricum (purchased from Wuhan Yuancheng Co-creation science and technology Co., Ltd., product number 35633) is added into the water collecting tank at an amount of 200mg of circulating water per L, and then the clostridium butyricum is added once every 10 days at an amount of 10mg of circulating water per L, meanwhile, thiobacillus thioparus (purchased from BNCC strain bank, product number BNCC223406) is added into the water collecting tank at an amount of 200mg of circulating water per L, and then the thiobacillus thioparus is added once every 10 days at an amount of 200mg of circulating water per L, sodium sulfite is added at an inlet of a circulating pump of a circulating water system, and the concentration of dissolved oxygen in the circulating water at an outlet of a heat exchanger is kept to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
Example 5
This example is for explaining the method of treating recirculated cooling water according to the present invention.
Water quality: domestic reuse water in table 1.
ConcentratingMultiple (Cl of circulating cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 3 +/-0.2
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (3 cm)2/L circulating water) in a water collecting tank, adding Alicyclobacillus acidocaldarius (purchased from Korotki Kogyo chemical technology Co., Ltd., product number ATCC49025) in an amount of 200mg per L circulating water, adding Acyclobacillus acidocaldarius every 10 days, wherein the adding amount is 200mg per L circulating water, adding Thiobacillus denitrificus (purchased from BNCC strain stock, product number ATCC23644) in an amount of 200mg per L circulating water, adding Acyclobacillus acidocaldarius every 10 days, wherein the adding amount is 10mg per L circulating water, adding dimethylketoxime at the inlet of a circulating pump of the circulating water system, and keeping the dissolved oxygen concentration in the circulating water at the outlet of a heat exchanger to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
Example 6
This example is for explaining the method of treating recirculated cooling water according to the present invention.
Water quality: domestic reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 2.5 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (3 cm)2/L circulating water) in a water collecting tank, adding bacillus coagulans (same as example 1) into the water collecting tank at an adding amount of 200mg of circulating water per L days, adding the bacillus coagulans once every 10 days at an adding amount of 100mg of circulating water per L, adding nitrosomonas europaea (same as example 1) into the water collecting tank at an adding amount of 200mg of circulating water per L days at an adding amount of 150mg of circulating water per L daysThe dissolved oxygen concentration is 1.5-2 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
Comparative example 1
Water quality: domestic reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 2.5 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (3 cm)2/L circulating water) is placed in a water collecting tank, meanwhile, nitrosomonas eurotis (same as the example 1) is added into the water collecting tank, the adding amount is 400mg per L circulating water, then the water is added once every 10 days, the adding amount is 250mg per L circulating water, sodium sulfite is added at the inlet of a circulating pump of a circulating water system, and the concentration of dissolved oxygen in the circulating water at the outlet of a heat exchanger is kept to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
Comparative example 2
Water quality: industrial reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 2.5 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
And (3) treatment: ecological floating island (1.5 cm)2/L circulating water) in a water collecting tank, adding Bacillus stearothermophilus (same as example 2) into the water collecting tank at an amount of 400mg of circulating water per L days, and then adding the Bacillus stearothermophilus once every 10 days at an amount of 160mg of circulating water per L, and circulating pump in a circulating water systemHydrazine hydrate is added at the inlet, and the concentration of dissolved oxygen in every L circulating water at the outlet of the heat exchanger is kept to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
Comparative example 3
Water quality: industrial reuse water in table 1.
Concentration factor (Cl of recirculated cooling water)-Concentration and make-up water Cl-Ratio of concentrations): 2.5 ± 0.2: 1.
pH: nature of nature
Flow rate: 1m/s
The treatment comprises the steps of adding bacillus stearothermophilus into a water collecting tank (same as example 2), wherein the adding amount is 200mg per L circulating water, adding the bacillus stearothermophilus into the water collecting tank once every 10 days, wherein the adding amount is 60mg per L circulating water, simultaneously adding multiple types of nitrosospira into the water collecting tank (same as example 2), wherein the adding amount is 200mg per L circulating water, adding the nitrosspira into the water collecting tank once every 10 days, wherein the adding amount per L circulating water is 100mg per L circulating water, adding hydrazine hydrate into an inlet of a circulating pump of a circulating water system, and keeping the concentration of dissolved oxygen in the circulating water at an outlet of a heat exchanger to be less than 1 mg/L.
Inlet temperature of circulating water at the inlet of the heat exchanger: 32 + -1 deg.C
Temperature difference between the inlet and the outlet of the circulating water: 8-10 deg.C
Operating time: 60 days
The results of the dynamic simulation are shown in Table 2.
TABLE 2
Comparing the results of examples 1-6 with those of comparative examples 1-3, it can be seen that the present invention can effectively reduce the COD value, ammonia nitrogen content and total phosphorus content of the recirculating cooling water and maintain the heat exchange tubes in the recirculating cooling water system to have a low corrosion rate and adhesion rate by adding a system containing an ecological floating island, acid-producing bacteria, autotrophic microorganisms and optionally an oxygen consuming agent to the recirculating cooling water system.
Specifically, as can be seen by comparing the results of examples 1 to 5 above with those of example 6, in a preferred embodiment of the present invention, by placing ecological floating islands, acid-producing bacteria and autotrophic microorganisms in the water collecting tank while feeding an oxygen consuming agent at the inlet of the circulating pump, controlling the dissolved oxygen concentration in the circulating water within a specific range (≦ 1 mg/L), it is possible to further reduce the corrosion rate and adhesion rate of the heat exchange tubes, and to maintain a low COD value, ammonia nitrogen content and total phosphorus content in the circulating cooling water system, specifically, it is possible to reduce the COD value of the circulating cooling water to 28 mg/L or less, reduce the ammonia nitrogen content to 2.55 mg/L or less, reduce the total phosphorus content to 0.95 mg/L or less, and maintain the corrosion rate of the heat exchange tubes in the circulating cooling water system to 0.056mm/a or less and the adhesion rate to 9.6mcm or less.
Meanwhile, the system used by the invention mainly takes biological agents (such as acid-producing bacteria and autotrophic microorganisms) and has the advantages of environmental protection. In addition, the system for treating the circulating cooling water can be directly applied to the existing circulating cooling water system without additionally increasing advanced treatment equipment, so that the treatment cost is greatly reduced.
The preferred embodiments of the present invention have been described above in detail, but the present invention is not limited thereto. Within the scope of the technical idea of the invention, many simple modifications can be made to the technical solution of the invention, including combinations of various technical features in any other suitable way, and these simple modifications and combinations should also be regarded as the disclosure of the invention, and all fall within the scope of the invention.
Claims (27)
1. A system for treating circulating cooling water is characterized by comprising an ecological floating island, acid-producing bacteria, autotrophic microorganisms and an oxygen consumption agent, wherein reuse water is used for supplementing water;
wherein, the recycled water is CaCO3Measured Ca2+The concentration is 150-300 mg/L, as CaCO3The total hardness of the meter is 200-L as CaCO3The total alkalinity is 100-200 mg/L and Cl-Concentration of 20-200 mg/L, COD value of 20-60 mg/L, ammonia nitrogen content of 4-6 mg/L in terms of N element, and PO content4 3-The total phosphorus concentration is 0.5-5 mg/L, and the pH value is 8-8.5;
the content of the oxygen consumption agent ensures that the concentration of dissolved oxygen in the circulating cooling water is less than or equal to 1 mg/L;
the acid-producing bacteria are acid-producing bacillus;
the autotrophic microorganisms are nitrifying bacteria and/or sulfuration bacteria;
the oxygen consuming agent is selected from at least one of sodium sulfite, hydrazine hydrate and dimethyl ketoxime.
2. The system of claim 1, wherein the weight ratio of the acid forming bacteria to the autotrophic microorganisms is 1: 0.01-100.
3. The system of claim 1, wherein the weight ratio of the acid forming bacteria to the autotrophic microorganisms is 1: 0.05-20.
4. The system according to any one of claims 1-3, wherein the acid producing bacteria is selected from at least one acid producing bacteria of the genus Bacillus (Bacillus), Clostridium (Clostridium), Lysinibacillus (L ysinibacillus), Alicyclobacillus (Alicyclobacillus).
5. The system according to claim 4, wherein the acid producing bacteria is selected from at least one of Bacillus coagulans (Bacillus coagulans), Bacillus smithii (Bacillus smithii), Bacillus stearothermophilus (Bacillus stearothermophilus), Bacillus laevolactis (Bacillus laevicticus), Bacillus racemosus (Bacillus racemosus), Bacillus balloonius (Bacillus vesiculifera), Bacillus butyricum (Clostridium butyricum), Bacillus lysimachiae (L lysinibacillus sphaericus), and Bacillus acidocaldarius (Alicyclobacillus acidocaldarius).
6. The system of claim 4, wherein the acid producing bacteria is selected from at least one of Bacillus coagulans, Bacillus stearothermophilus, Bacillus levolactis, Clostridium butyricum, and Bacillus alicycloacidocaldarius.
7. A system according to any one of claims 1 to 3, wherein the autotrophic microorganisms are selected from at least one autotrophic microorganism of the genera Nitrosomonas (nitrosolomas), Nitrosospira (nitrospira), Nitrosococcus (Nitrococcus), nitrosophyllum (Nitrosolobus), nitrospinella (nitrospira), Nitrococcus (Nitrococcus) and Thiobacillus (Thiobacillus).
8. The system according to claim 7, wherein the autotrophic microorganisms are selected from at least one of Nitrosomonas europaea (nitromonas europaea), Nitrosomonas chilling (nitromonas cryolerans), Nitrosospira polytype (nitrospira multiformis), Nitrosococcus marine (Nitrococcus oceani), nitrobacter fibrosus (nitrospira gracilis), Nitrococcus mobilis (Nitrococcus mobilis), thiooxidans (Thiobacillus thiooxidans), Thiobacillus thioparus (Thiobacillus thioparus) and Thiobacillus denitrificans (Thiobacillus thiostreptons).
9. The system according to claim 7, wherein the autotrophic microorganisms are selected from at least one of nitrosomonas europaea, nitrosospira polytype, nitrosococcus oceanic, thiobacillus thioparus and thiobacillus denitrificans.
10. The system of any one of claims 1-3, wherein the ecological floating island, the acid forming bacteria, the autotrophic microorganisms, and the oxygen consuming agent are each maintained separately;
alternatively, the acid forming bacteria and the autotrophic microorganisms are co-preserved, but they are preserved separately from the ecological floating island and the oxygen consuming agent, respectively.
11. Use of a system according to any one of claims 1 to 10 in the treatment of circulating cooling water.
12. Use of a system according to any one of claims 1 to 10 in the treatment of recirculated cooling water supplemented with reuse water.
13. A method of recirculating cooling water treatment, the method comprising: adding an ecological floating island, acid-producing bacteria, autotrophic microorganisms and an oxygen consumption agent into a circulating cooling water system, wherein the circulating cooling water system takes recycled water as water for supplementing;
wherein, the recycled water is CaCO3Measured Ca2+The concentration is 150-300 mg/L, as CaCO3The total hardness is 200-500 mg/L as CaCO3The total alkalinity is 100-200 mg/L and Cl-Concentration of 20-200 mg/L, COD value of 20-60 mg/L, ammonia nitrogen content of 4-6 mg/L in terms of N element, and PO content4 3-The total phosphorus concentration is 0.5-5 mg/L, and the pH value is 8-8.5;
the content of the oxygen consumption agent ensures that the concentration of dissolved oxygen in the circulating cooling water is less than or equal to 1 mg/L;
the acid-producing bacteria are acid-producing bacillus;
the autotrophic microorganisms are nitrifying bacteria and/or sulfuration bacteria;
the oxygen consuming agent is selected from at least one of sodium sulfite, hydrazine hydrate and dimethyl ketoxime.
14. The method of claim 13, wherein the total area of the ecological floating island is 1-8cm per L circulating cooling water2。
15. The method of claim 13, wherein the total area of the ecological floating island is 1.5-6cm per L circulating cooling water2。
16. The method of claim 13, wherein the acid-producing bacteria are dosed every 5-15 days.
17. The method of claim 16, wherein the acid-producing bacteria are dosed every 8-10 days.
18. The method of claim 13, wherein each dose of acid forming bacteria is 5-500mg per L cycles of cooling water.
19. The method of claim 18, wherein each dose of acid forming bacteria is 10-200mg per L cycles of cooling water.
20. The method of claim 13, wherein the autotrophic microorganisms are dosed at a frequency of once every 5-15 days.
21. The method of claim 20, wherein the autotrophic microorganisms are dosed at a frequency of once every 8-10 days.
22. The method of claim 13, wherein each dosage of said autotrophic microorganisms is between 5 and 500mg per L cycles of cooling water.
23. The method of claim 22, wherein each dosage of said autotrophic microorganisms is between 10 and 200mg per L cycles of cooling water.
24. The method of any one of claims 13-23, wherein the ecological floating island is dosed at a sump in a recirculating cooling water system.
25. The method of claim 24, wherein the acid-producing bacteria dosing location is a catch basin in a recirculating cooling water system.
26. The method of claim 24, wherein the locus of addition of the autotrophic microorganisms is a sump in a recirculating cooling water system.
27. The method of claim 24, wherein the location of addition of the oxygen consuming agent is an inlet of a circulation pump in a recirculating cooling water system.
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