CN112299548A - Method for in-situ oxidative decomposition of algal toxins in algal bloom water body by ozone-rich colloid micro-nano bubbles - Google Patents

Method for in-situ oxidative decomposition of algal toxins in algal bloom water body by ozone-rich colloid micro-nano bubbles Download PDF

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CN112299548A
CN112299548A CN202011037032.0A CN202011037032A CN112299548A CN 112299548 A CN112299548 A CN 112299548A CN 202011037032 A CN202011037032 A CN 202011037032A CN 112299548 A CN112299548 A CN 112299548A
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ozone
algal
water body
colloid micro
bubble
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张明
王亚峰
张道勇
潘响亮
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/72Treatment of water, waste water, or sewage by oxidation
    • C02F1/78Treatment of water, waste water, or sewage by oxidation with ozone
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/24Treatment of water, waste water, or sewage by flotation
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/34Treatment of water, waste water, or sewage with mechanical oscillations
    • C02F1/36Treatment of water, waste water, or sewage with mechanical oscillations ultrasonic vibrations
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00Treatment of water, waste water, or sewage
    • C02F1/52Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
    • C02F1/5236Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00Specific treatment goals
    • C02F2303/04Disinfection

Abstract

The invention discloses a method for in-situ oxidative decomposition of algal toxins in an algal bloom water body by ozone-rich colloid micro-nano bubbles, which comprises the following steps: mixing ozone and the bubble generating liquid to prepare an ozone-rich colloid micro-nano bubble solution; introducing the solution rich in ozone colloid micro-nano bubbles into the algal bloom water body, degrading algal toxins in the algal bloom water body at normal temperature and normal pressure, removing algae, and collecting the water surface algae residues and the degraded water body after degradation; the bubble generation liquid consists of a surfactant, an inorganic polymer coagulant and water; the mass transfer effect of the nano bubbles in the ozone-rich colloid micro-nano bubbles is better, the stability is stronger, the retention time in water is longer, and the area of a treatable area is wider; the micro-bubbles have the functions of strengthening the capture of algae cells and carrying ozone. The cell removal effect is enhanced; in the process of combining with cells, bubbles are broken, ozone is released, and the bubbles can directly act with algal toxins to be oxidized and decomposed in situ.

Description

Method for in-situ oxidative decomposition of algal toxins in algal bloom water body by ozone-rich colloid micro-nano bubbles
(I) technical field
The invention relates to the field of water body treatment, in particular to a method for in-situ oxidative decomposition of algal toxins in an algal bloom water body by ozone-rich colloid micro-nano bubbles.
(II) background of the invention
The aquatic ecological environment and the drinking water safety are seriously harmed by the algae propagation caused by the eutrophication of the water body. Harmful algal blooms co-occur 1194 in coastal areas of China from 2000 to 2016, averaging 70 per year. The mass propagation of algae not only hinders the normal growth of aquatic organisms, but also severely influences the water quality by algal toxins generated by the microalgae in the propagation process. Research shows that the phycotoxin has strong carcinogenicity. Drinking a small amount of the tea can cause acute gastroenteritis, and long-term drinking of the tea can cause liver cancer. The algal toxin is easy to dissolve in water, the chemical property is stable, the algal toxin can be removed by removing microalgae cells through conventional treatment methods such as coagulation, air flotation and the like, but the addition amount is large, the utilization rate of a coagulant is low, and the treatment effect on extracellular algal toxin is poor. In addition, ozone as a strong oxidant can effectively degrade algal toxins, and is generally subjected to pre-ozonation before the water bloom is treated to decompose pollutants. The pre-oxidation is to enhance the coagulation effect, but the high dosage not only reduces the utilization rate of the medicament, but also easily causes the death of algae cells to release algal toxins. In addition, an ozone aeration system and an aeration tank are required to be arranged in the process, so that the treatment cost is increased.
The nano bubbles can be used for oxygenating water bodies due to the characteristics of large specific surface area, low rising speed, brownian motion in water and the like, and are applied to the aspects of sewage treatment, ecological restoration and the like. Compared with nano bubbles, the micro bubbles with large particle size have high rising speed and mainly have the function of floating separation. The inner core of the micro-nano bubble generally contains carbon dioxide or oxygen, and the algal toxin in water can not be effectively degraded when the water bloom water is treated. Therefore, the invention provides the ozone-rich colloid micro-nano bubbles, coagulant is added into the micro-nano bubble generation liquid, and ozone is introduced into the micro-nano bubble generation liquid to form the ozone-rich colloid micro-nano bubbles with ozone as a core and positively charged surfaces. The invention aims to develop a novel bubble technology which has the functions of decomposing algal toxins in situ and efficiently removing algal cells so as to efficiently treat surface algal blooms.
Disclosure of the invention
The invention aims to provide a method for in-situ oxidative decomposition of algal toxins in an algal bloom water body by ozone-rich colloid micro-nano bubbles, which is characterized in that ozone-rich colloid micro-nano bubbles with a positive surface charge and taking ozone as a core are formed by adding a surfactant, a coagulant and ozone, so that not only can algal cells be rapidly captured and removed through flocculation and electrostatic action, but also ozone released after bubbles are broken can be subjected to in-situ oxidative decomposition of algal toxins, and the method has the functions of in-situ decomposition of algal toxins and efficient removal of algal cells, so that the surface algal bloom can be efficiently treated.
The technical scheme adopted by the invention is as follows:
the invention provides a method for in-situ oxidative decomposition of algal toxins in an algal bloom water body by ozone-rich colloid micro-nano bubbles, which comprises the following steps: mixing ozone and the bubble generating liquid to prepare an ozone-rich colloid micro-nano bubble solution; then introducing the ozone-rich colloid micro-nano bubble solution into the algal bloom water body, degrading algal toxins in the algal bloom water body at normal temperature (25-30 ℃) and normal pressure (0.1Mpa), simultaneously removing algae, and after degradation is finished, collecting the water surface algal residues and the degraded water body; the bubble generation liquid consists of a surfactant, an inorganic polymer coagulant and water, wherein the surfactant is one of dodecyl dimethyl betaine, tetradecyl dimethyl betaine or octadecyl dimethyl betaine; the inorganic polymer coagulant is an aluminum coagulant, preferably one of polyaluminium chloride, polyaluminium sulfate or polyaluminium silicate.
Further, the bubble generation liquid is prepared by mixing 0.05-0.2mmol/L of surfactant aqueous solution and 1.0-2.0mmol/L of inorganic polymer coagulant aqueous solution according to the volume ratio of 1: 1-2, and mixing.
Further, the ozone introduction amount is 0.1-2.0mg/L calculated by the volume of the algal bloom water body; the addition amount of the bubble generation liquid is 0.1-1.0L/L (preferably 0.5L/L) calculated by the volume of the algal bloom water body.
Further, the algal bloom water body OD6800.050-0.760, and algae cell content of 1.0-15 × 105cells/mL, the content of algal toxin is 1-60 mug/L.
Further, when the density of algal cells in the algal bloom water body is less than or equal to 8 multiplied by 105When cells/mL (or the content of algal toxin is 1-30 mu g/L), the concentration of the inorganic high-molecular coagulant aqueous solution is 1.5-2.0mmol/L, preferably 1.2-1.7mmol/L, the surfactant is 0.05-0.2mmol/L, preferably 0.05-0.1mmol/L, and the ozone introduction amount is 0.1-1.0mg/L calculated by the volume of the algal bloom water body.
Further, when the density of algae cells in the algae bloom water body is higher than 8 multiplied by 105When cells/mL (or the content of algal toxin is 30-60 mu g/L), the adding concentration of the inorganic high-molecular coagulant aqueous solution is 1.5-2.0mmol/L, preferably 1.7mmol/L, the adding concentration of the surfactant is 0.1-0.2 mmol/L, preferably 0.1mmol/L, and the ozone introduction amount is 1.0-2.0mg/L calculated by the volume of the algal bloom water body.
Further, the time for degrading the algal toxins in the algal bloom water body is 5-20min, preferably 10 min.
Further, ozone is generated by an air ozone compressor, and is mixed with the bubble generating liquid for 1-3min, then under the action of 0.3-0.8MPa pressure or 10-30kHz ultrasonic action or the action of a vacuum water jet device, an ozone-rich colloid micro-nano bubble solution is formed, and the ozone-rich colloid micro-nano bubble solution is introduced into the algal bloom water body for degradation. The air inlet amount of the air ozone compressor is 1L/min, and the current is 40-100 mA.
Further, the ozone-rich colloid micro-nano bubble solution is prepared according to one of the following methods: (1) mixing ozone provided by an air ozone compressor with the bubble generating liquid for 1-3min, and forming an ozone-rich colloid micro-nano bubble solution under the high pressure of 0.3-0.8 MPa; (2) mixing ozone generated by an air ozone compressor with bubble generation liquid for 1-3min, and breaking and decomposing the micro-bubbles into ozone-rich colloid micro-nano bubbles under the ultrasonic action of an ultrasonic vibrator when passing through an ultrasonic wave tube under the ultrasonic frequency of 10-30kHz to form an ozone-rich colloid micro-nano bubble solution; (3) mixing ozone generated by an air ozone compressor with the bubble generation liquid for 1-3min, and allowing the mixture to flow through a vacuum water jet device to generate an ozone-rich colloid micro-nano bubble solution; the ratio of the nozzle diameter of the vacuum water injector to the distance of the throat pipe is 0.5-0.8: 1, the ratio of the diameter of the throat to the diameter of the nozzle is 0.33-0.50: 1, the ratio of the nozzle area to the throat area is 0.36-0.64: 1, preferably the ratio of the nozzle diameter to the throat distance is 0.6: 1, the ratio of the throat diameter to the nozzle diameter is 0.4:1, and the ratio of the nozzle area to the throat area is 0.5: 1.
The ozone concentration of the ozone-rich colloid micro-nano bubbles generated by the method (1) is 1.0-1.5mg/L, the particle size of the bubbles is 0.5-20.0 mu m, the half-life period of a bubble system is 36-72h, and the volume ratio of nano bubbles to micro bubbles is 3:7-6: 4; the ozone concentration in the ozone-rich colloid micro-nano bubbles generated by the method (2) is 0.5-1.0mg/L, the bubble particle size is 0.1-10.0 mu m, the half-life period of a bubble system is 48-120h, and the volume ratio of nano bubbles to micro bubbles is 7:3-8: 2; the ozone concentration in the ozone-rich colloid micro-nano bubbles generated by the method (3) is 0.1-0.5mg/L, the bubble particle size is 1.0-30.0 mu m, the half-life period of a bubble system is 24-48h, and the volume ratio of nano bubbles to micro bubbles is 1:9-2: 8.
Further, when the concentration of the algae toxins in the water body is lower than 1 mu g/L or the algae density is lower than 103cells/L (or OD)680Below 0.01) degradation is complete.
Compared with the prior art, the invention has the following beneficial effects:
1. the mass transfer effect of the nano bubbles in the ozone-rich colloid micro-nano bubbles is better, the stability is stronger, the half-life period is up to several days, the retention time in water is longer, and the area of a treatable area is wider; the micro-bubbles have the functions of strengthening the capture of algae cells and carrying ozone.
2. The ozone-rich colloid micro-nano bubble surface is loaded with the coagulant, so that the utilization efficiency of the coagulant is improved by 30-50%, and the cell removal effect is enhanced by 10-30%; in the process of combining with cells, bubbles are broken, ozone is released, and the bubbles can directly act with algal toxins to be oxidized and decomposed in situ.
3. Ozone is oxidized and decomposed when the micro-nano bubbles are broken, so that secondary pollution of the surfactant can not be caused.
4. Ozone, coagulant and surfactant are mixed, and an ozone disinfection and coagulation administration device does not need to be arranged independently.
(IV) description of the drawings
FIG. 1: schematic diagrams of separating algae cells and in-situ oxidizing and decomposing algae toxins by using the ozone-rich colloid micro-nano bubbles prepared by the three methods. 1 air ozone compressor, 2 bubble generating liquid storage tanks, 3 pressure dissolved air tanks, 4 ultrasonic wave tubes, 5 vacuum water jet devices, 6 oxidation degradation pond, 7 algae sediment collecting ponds, 8 algae liquid recovery ponds.
(V) detailed description of the preferred embodiments
The invention will be further described with reference to specific examples, but the scope of the invention is not limited thereto:
the normal temperature of the invention is 25-30 ℃, and the normal pressure is 0.1 MPa.
Example 1
Referring to the method I in FIG. 1, ozone is generated by an air ozone compressor 1, the ozone and the bubble generating liquid in a bubble generating liquid storage tank 2 are mixed in a pressure dissolved air tank 3 to form an ozone-rich colloid micro-nano bubble solution, part of the ozone-rich colloid micro-nano bubble solution is introduced into an oxidation degradation pool 6 filled with an algal bloom water body for degradation, algal residues enter an algal residue collection pool 7, and the degraded water body enters an algal liquid recovery pool 8.
An air ozone compressor (Beijing Tonglin ozone, model 3S-T3), air inflow of 1L/min and current of 100 mA; pressure dissolved air tank (Hangzhou osmanthus, model HG-WNF-1).
Algal bloom water, i.e., water polluted by algal toxins, OD6800.760, algal cell content 1.25X 106cells/mL, algal toxin content 54 μ g/L.
Bubble generation liquid: 0.1mmol/L aqueous dodecyl dimethyl betaine solution and 1.7mmol/L aqueous polyaluminum chloride solution in a volume ratio of 1: 1.
8mg of compressed ozone (the input speed is 3.2mg/min) provided by an air ozone compressor 1 is mixed with 2L of bubble generation liquid in a bubble generation liquid storage tank 2 for 2.5min, and the mixture is input into a pressure dissolved air tank 3 to form ozone-rich colloid micro-nano bubble solution under the condition of 0.5 MPa; then 0.3L of ozone-rich colloid micro-nano bubble solution (namely the bubble generates liquid product, the volume of ozone is ignored) is input into the oxidation degradation pool 6 from 0.3m under the surface of 0.6L algal bloom water body through a pipeline at the speed of 320mL/min, and the reaction is carried out for 10min under normal temperature and normal pressure until the concentration of algal toxin in the water body is 0.8 mug/L and the algal density is 104cells/L,OD6800.017. Collecting the floating slag floating to the surface of the water body to an algae slag collecting tank 7, and allowing the degraded water body to enter into algae liquidA recovery tank 8.
Sampling and detecting relevant properties of bubbles in the pressure dissolved air tank 2, analyzing the bubble particle size by using a microscope and image J software to obtain the bubble particle size of 10 mu m, obtaining the half-life period of 48h by using origin fitting according to the rupture speed of the bubbles in a 100mL measuring cylinder, and calculating the ozone concentration of 4mg/L in the ozone-enriched colloid micro-nano bubble solution according to the volume of the introduced ozone and the bubble generation liquid.
Measuring the absorbance of the water body before and after treatment at 680nm by using an ultraviolet spectrophotometer, detecting the DOC content in the water body before and after treatment by using a TOC analyzer, measuring the phycotoxin according to high performance liquid chromatography in GB20466-2006, measuring the chlorophyll a content according to the HJ897-2017 water quality measurement standard, and obtaining the result shown in Table 1. The ozone-rich colloid micro-nano bubbles can be used for separating algae cells in situ, the OD680 removal rate reaches 96.7%, and the content of the algae toxins is reduced to 0.8 mu g/L by degrading.
Table 1: removing condition of ozone-rich colloid micro-nano bubbles on algal toxins in algal bloom water body
Example 2
Referring to the method II in the figure 1, ozone is generated by an air ozone compressor 1, the ozone and the bubble generating liquid in a bubble generating liquid storage tank 2 are simultaneously introduced into an ultrasonic wave tube 4 to form an ozone-rich colloid micro-nano bubble solution, finally, part of the ozone-rich colloid micro-nano bubble solution is introduced into an oxidative degradation tank 6 filled with algal bloom water for degradation, algal residues enter an algal residue collection tank 7, and the degraded water enters an algal liquid recovery tank 8.
An air ozone compressor (Beijing Tonglin ozone, model 3S-T3), air inflow of 1L/min and current of 60 mA; an ultrasonic pipeline, a Shanghai ultrasonic analysis instrument, model FS-350T.
Algal bloom water, i.e., water polluted by algal toxins, OD6800.260, algal cell content 8 × 105cells/mL, the content of algal toxin is 14.8 mu g/L.
Bubble generation liquid: 0.1mmol/L aqueous dodecyl dimethyl betaine solution and 1.7mmol/L aqueous polyaluminum chloride solution in a volume ratio of 1: 1.
Mixing 4mg of ozone (with the introduction speed of 1.6mg/min) generated by an air ozone compressor 1 with 2.0L of bubble generating liquid in a bubble generating liquid storage tank 2 for 2.5min, breaking and decomposing the micro bubbles into ozone-rich colloid micro-nano bubbles through an ultrasonic wave tube 4 under the condition of an ultrasonic frequency of 20kHz to obtain an ozone-rich colloid micro-nano bubble solution, inputting the 0.3L of ozone-rich colloid micro-nano bubble solution from a position which is 0.3m away from the surface of a water body and is provided with a 0.6L algal bloom water body oxidation degradation pool 6 through a pipeline at the speed of 320mL/min, and reacting for 10min at normal temperature and normal pressure until the concentration of algal toxin in the water body is 0.6 mu g/L and the algae density is 103cells/L,OD6800.007. Collecting the floating slag floating to the surface of the water body to an algae slag collecting tank 7, and feeding the degraded water body to an algae liquid recycling tank 8.
The method of the embodiment 1 is adopted to detect that the bubble particle size of the ozone-rich colloid micro-nano bubble solution is 5 microns, the half-life period is 56 hours, and the ozone concentration is 2 mg/L.
The method of example 1 was used to measure the relevant water body indices and the results are shown in table 2. The ozone-rich colloid micro-nano bubbles can be used for separating algae cells in situ, the OD680 removal rate reaches 95.9%, and the content of the algae toxins is reduced to 0.6 mu g/L by degrading.
Table 2: removal of algal toxin in algal bloom water body by ozone-rich colloid micro-nano bubbles
Example 3
Referring to the method III in the figure 1, ozone is generated through an air ozone compressor 1, the ozone and the bubble generating liquid in a bubble generating liquid storage tank 2 are simultaneously introduced into a vacuum water jet device 5 to form an ozone-rich colloid micro-nano bubble solution, finally, part of the ozone-rich colloid micro-nano bubble solution is introduced into an oxidative degradation tank 6 filled with algal bloom water for degradation, algal residues enter an algal residue collection tank 7, and the degraded water enters an algal liquid recovery tank 8.
An air ozone compressor (Beijing Tonglin ozone, model 3S-T3), air inlet quantity of 1L/min and current of 40 mA.
Vacuum water jet (Ningbo maofei pump plant, model RPP-32-25/40), nozzle diameter to throat distance ratio 0.6: 1, the ratio of the throat diameter to the nozzle diameter is 0.4:1, and the ratio of the nozzle area to the throat area is 0.5: 1.
Algal bloom water, i.e., water polluted by algal toxins, OD6800.050, algal cell content 6 × 105cells/mL, the content of algal toxin is 4.3 mug/L.
Bubble generation liquid: 0.05mmol/L of dodecyl dimethyl betaine aqueous solution and 1.2mmol/L of polyaluminum chloride aqueous solution in a volume ratio of 1: 1.
1mg of ozone (with the inlet speed of 0.4mg/min) generated by an air ozone compressor 1 is mixed with 2.0L of bubble generating liquid in a bubble generating liquid storage tank 2 for 2.5min, the mixed liquid flows through a vacuum water jet device 5 to generate ozone-rich colloid micro-nano bubble solution, 0.3L of ozone-rich colloid micro-nano bubble solution is input from a position 0.3m below the surface of a water body of an oxidative degradation pool 6 filled with 0.6L of algal bloom water body through a pipeline at the speed of 320mL/min, and the reaction is carried out for 10min at normal temperature and normal pressure until the concentration of algal toxin in the water body is 0.4 mu g/L and the algal density is 10 mu g/L3cells/L,OD6800.005. Collecting the floating slag floating to the surface of the water body to an algae slag collecting tank 7, and feeding the degraded water body to an algae liquid recycling tank 8.
The bubble particle diameter is 8 μm, the half-life period is 34h, and the ozone concentration is 0.5mg/L, which are detected by the same method as the example 1.
The relevant water body indexes are measured by the same method as the example 1, and the results are shown in a table 3. The ozone-rich colloid micro-nano bubbles can be used for separating algae cells in situ, the OD680 removal rate reaches 85.7%, and the content of the algae toxins is reduced to 0.4 mu g/L by degrading.
Table 3: removal of algal toxin in algal bloom water body by ozone-rich colloid micro-nano bubbles

Claims (10)

1. A method for in-situ oxidative decomposition of algal toxins in an algal bloom water body by ozone-rich colloid micro-nano bubbles is characterized by comprising the following steps: mixing ozone and the bubble generating liquid to prepare an ozone-rich colloid micro-nano bubble solution; then introducing the ozone-rich colloid micro-nano bubble solution into the algal bloom water body, degrading algal toxins in the algal bloom water body at normal temperature and normal pressure, simultaneously removing algae, and collecting the water surface algae residues and the degraded water body after degradation; the bubble generation liquid consists of a surfactant, an inorganic polymer coagulant and water, wherein the surfactant is one of dodecyl dimethyl betaine, tetradecyl dimethyl betaine or octadecyl dimethyl betaine; the coagulant is one of polyaluminium chloride, polyaluminium sulfate or polyaluminium silicate.
2. The method according to claim 1, wherein the bubble generating solution is prepared from 0.05-0.2mmol/L surfactant aqueous solution and 1.0-2.0mmol/L inorganic polymeric coagulant aqueous solution in a volume ratio of 1: 1-2, and mixing.
3. The method as claimed in claim 1, wherein the ozone is introduced in an amount of 0.1-2.0mg/L in terms of the volume of the algal bloom water; the addition amount of the bubble generation liquid is 0.1-1.0L/L calculated by the volume of the algal bloom water body.
4. The method of claim 1, wherein the algal bloom water body OD6800.050-0.760, and algae cell content of 1.0-15 × 105cells/mL, the content of algal toxin is 1-60 mug/L.
5. The method according to claim 4, wherein the algal cell content in the algal bloom water body is less than or equal to 8 x 105When cells/mL, the adding concentration of the inorganic polymer coagulant aqueous solution is 1.5-2.0mmol/L, the adding concentration of the surfactant aqueous solution is 0.05-0.2mmol/L, and the ozone introduction amount is 0.1-1.0mg/L calculated by the volume of the algal bloom water body.
6. The method according to claim 4, wherein the algal cell content in the algal bloom water body is higher than 8 x 105When cells/mL, the inorganic polymer coagulant aqueous solution is added with the concentration1.5-2.0mmol/L, 0.1-0.2 mmol/L of surfactant aqueous solution, and 1.0-2.0mg/L of ozone based on the volume of the algal bloom water.
7. The method according to claim 1, wherein the ozone-rich colloid micro-nano bubble solution is formed by generating ozone through an air ozone compressor, mixing the ozone with the bubble generating liquid for 1-3min under the pressure of 0.3-0.8MPa or under the ultrasonic action of 10-30kHz or under the action of a vacuum water jet device.
8. The method as set forth in claim 7, wherein the air ozone compressor has an air intake of 1L/min and an electric current of 40-100 mA.
9. The method according to claim 7, wherein the ozone-enriched colloidal micro-nano bubble solution is prepared by one of the following methods: (1) mixing ozone generated by an air ozone compressor with the bubble generation liquid for 1-3min, and forming an ozone-rich colloid micro-nano bubble solution under the high pressure of 0.3-0.8 MPa; (2) mixing ozone generated by an air ozone compressor with the bubble generation liquid for 1-3min, and forming an ozone-rich colloid micro-nano bubble solution under the action of ultrasonic frequency of 10-30 kHz; (3) mixing ozone generated by an air ozone compressor with the bubble generation liquid for 1-3min, and allowing the mixture to flow through a vacuum water jet device to generate an ozone-rich colloid micro-nano bubble solution; the ratio of the nozzle diameter of the vacuum water injector to the distance of the throat pipe is 0.5-0.8: 1, the ratio of the diameter of the throat to the diameter of the nozzle is 0.33-0.50: 1, the ratio of the nozzle area to the throat area is 0.36-0.64: 1.
10. the method of claim 1, wherein the concentration of algal toxin in the body of water is less than 1 μ g/L or OD680When the degradation is finished below 0.01, collecting the algae residues on the water surface and the degraded water body.
CN202011037032.0A 2020-09-28 2020-09-28 Method for in-situ oxidative decomposition of algal toxins in algal bloom water body by ozone-rich colloid micro-nano bubbles Pending CN112299548A (en)

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