CN110841499A

CN110841499A - System for generating nanobubbles in a fluid in which plants or fish are located

Info

Publication number: CN110841499A
Application number: CN201910020383.1A
Authority: CN
Inventors: 潘心杏; 吴宜贞; 黄锦礼; 黄志坚; 张翠丽; 何嘉仪
Original assignee: Nano and Advanced Materials Institute Ltd
Current assignee: Nano and Advanced Materials Institute Ltd
Priority date: 2018-08-20
Filing date: 2019-01-09
Publication date: 2020-02-28
Anticipated expiration: 2039-01-09
Also published as: HK1255801A2; CN209631007U; CN110841499B

Abstract

The present invention relates to a system for generating nanobubbles in a fluid in which plants or fish are located, comprising at least one nanobubble generator for generating nanobubbles and increasing the amount of dissolved gas; at least two air pumps for controlling the generation of nano bubbles and automatically and periodically cleaning the nano bubble generator or other components; and a fluid quality monitoring system for displaying the measured parameters of dissolved oxygen, pH value, conductivity, water body temperature, environment temperature and the like. When the nano bubbles are generated by using air or oxygen or ozone, the system of the invention has application potential for promoting plant growth, increasing the germination rate of seeds, increasing the survival rate and growth rate of freshwater fish or marine fish, and the generated ozone nano bubbles can reduce bacteria or algae in the water medium for plant or fish culture.

Description

System for generating nanobubbles in a fluid in which plants or fish are located

Technical Field

Background

Oxygen is an essential element for the respiration of organisms. Plants absorb oxygen through stomata in the leaves and roots, while fish absorb oxygen through gills. Plants consume more oxygen at higher temperatures due to the increased respiration rate of the root tissue. The respiration rate of the roots may double for every 10 degrees celsius rise in temperature, up to 30 degrees celsius. If the dissolved oxygen in the water is not sufficient, as in the case of hydroponic plants, the energy released from the respiration process will be suppressed for root growth and nutrient absorption. Also, fish need more oxygen to breathe at high temperatures. When the dissolved oxygen level in the water drops below 5.0 mg/liter, the fish will be stressed. The consumption of oxygen by plants and fish is higher at higher temperatures. When oxygen is depleted, the growth of hydroponic plants and fish will be inhibited.

CN107413219A discloses a system for generating oxidizing bubbles smaller than 500nm in a fluid, comprising a fluid inlet tube; a venturi tube; a component of less than 50 microns having pores or microslits to deliver reagents with oxidative properties into the fluid; a chamber surrounding the assembly having the micro-holes or micro-slits, which can generate a swirling flow to increase a contact time between the reagent having the oxidizing property and the fluid and generate bubbles in the fluid; a fluid outlet pipe for discharging the oxidizing bubbles in the fluid.

CN102657887A discloses a disinfection method for soilless culture nutrient solution, which comprises introducing micro-nano ozone bubbles into the soilless culture solution to sterilize the nutrient solution. The method combines the sterilization effect of ozone with the use of a micro-nano bubble generating device to dissolve the ozone into the nutrient solution to kill bacteria and other organic matters and increase the dissolved oxygen in the nutrient solution.

Disclosure of Invention

The invention discloses a system for generating nano bubbles in fluid in which plants or fishes are located, which comprises at least one nano bubble generator, a gas generator and a gas control device, wherein the nano bubble generator is used for generating nano bubbles and increasing the dissolved amount of gas; a control system having a plurality of electronic units; at least two solenoid control valves; at least three check valves; at least two air pumps for controlling the generation of nano bubbles and automatically and periodically cleaning the nano bubble generator or other components; a gas flow meter; an ozone generator; a dissolved ozone measuring device; and a fluid quality monitoring system with a liquid crystal display panel for displaying the measured parameters of dissolved oxygen, pH value, conductivity, water temperature, environment temperature and the like.

When air or oxygen or ozone is used to generate nanobubbles, dissolved oxygen in an aqueous medium for plants or fish can be increased. When the nanobubble generator of the present invention is used in the nutrient water tank of a planting system, the growth rate of plants may be higher in comparison. When the nanobubble generator of the present invention is used in the nutrient water tank of a planting system, a higher plant growth rate can be obtained. When the nano bubble generator of the present invention is used in a fish tank, the survival rate and growth rate of freshwater fish or seawater fish are higher. The use of air nanobubbles may increase the germination rate of plants. When nano bubbles are generated using ozone gas, the stable ozone nano bubbles in the water can be sterilized, for example, to reduce the content of bacteria or algae in an aqueous medium for plants or fishes. Thus, the system of the present invention has potential for application in agriculture and fisheries.

The invention and the prior art respectively lie in that: the invention leads the bubbles on the surface of the micropore or the micro slit to be subjected to strong separating force by means of introducing the fluid into the gas outlet component with the micropore or the micro slit to reduce the pressure of the surface of the component near the micropore or the micro slit so as to generate micro bubbles or even nano bubbles, thus the gas can be introduced into the nano bubble generator by using relatively low gas pressure, for example, only using normal pressure; the invention further disperses the bubbles generated by the fluid inlet passing through the air outlet component with micropores or micro slits through the rough component arranged at the fluid outlet so as to generate more uniform nano bubbles; the air pump of the present invention has a function of automatic periodic cleaning, and can periodically remove any dirt on the surfaces of the components, particularly the nanobubble generator and the rough components, such as any undissolved aggregated particles in the nutrient aqueous medium of plants or fishes or metabolic wastes of plants attached to the surfaces thereof.

Drawings

Embodiments of the invention are described in more detail below with reference to the accompanying drawings, in which:

FIG. 1 is a schematic view of a nanobubble generator according to the present invention;

FIG. 2 illustrates the concentration of nanobubbles and the diameter of the bubbles generated by the nanobubble generator according to the present invention;

fig. 3 shows a schematic view of a system according to the invention.

Detailed Description

The present invention provides a system for generating nanobubbles in a fluid in which plants or fishes are present, comprising at least one nanobubble generator for generating nanobubbles and increasing the amount of dissolved gas; a control system having a plurality of electronic units; at least two solenoid control valves; at least three check valves; at least two air pumps for controlling the generation of nano bubbles and automatically and periodically cleaning the nano bubble generator or other components; a gas flow meter; an ozone generator; a dissolved ozone measuring device; and a fluid quality monitoring system with a liquid crystal display panel for displaying the measured parameters of dissolved oxygen, pH value, conductivity, water temperature, environment temperature and the like.

Embodiments of the invention may be better understood by referring to the examples provided below by way of illustration. The invention is not limited to the examples given in this document.

Referring to fig. 1, a schematic view of a nanobubble generator according to the present invention includes a fluid inlet filter 10, a fluid inlet chamber 11, an assembly 22 having micro-pores or micro-slits for delivering a gas (e.g., air or oxygen or ozone) from an inlet pipe 21 into a fluid after passing through a gas inlet filter 20. The fluid stored in the fluid tank 1 may be ultrapure water, distilled water, tap water, or a nutrient aqueous medium for plants or fish. When the fluid passes through the gap between the assembly 22 and the fluid inlet chamber 11, the fluid pump 12 generates a high velocity fluid flow and the velocity of the fluid is suddenly increased to reduce the pressure at the surface of the assembly 22 near the micro-pores or micro-slits, the bubbles on the surface of the micro-pores or micro-slits are subjected to a strong separating force, and micro-bubbles or even nano-bubbles are generated. The generated microbubbles and nanobubbles are drawn into the fluid pump 12 and forced to disperse over the roughness element 14 to create more uniform and stable nanobubbles within the fluid outlet chamber 13. By controlling the gas flow rate, fluid flow rate, and roughness of the assembly 14, nanobubbles of varying concentrations and diameters of the present invention may be produced.

Referring to FIG. 2, the preferred nanobubbles produced by the present invention have a structure of Malvern^TMNanoSight^TMNS300 is characterized by an average bubble of about 100nm to about 500nmAnd more preferably from about 100nm to about 400nm in diameter. The preferred concentration of nanobubbles produced by the present invention is at least about 1 x 10 per milliliter of fluid⁷A gas bubble, and more preferably at least about 2 x 10 per milliliter of fluid⁷And (4) air bubbles.

The fluid inlet filter 10 serves to prevent any undissolved agglomerated particles in the nutrient aqueous medium of plants or fish and metabolic waste products of fish from entering the fluid inlet chamber 11 and adhering to the surfaces of the micro-pores or micro-slits of the assembly 22. The width of the slit is preferably from about 0.5 to about 3mm, and the length of the slit is from about 5 to about 15 mm; more preferably, the width of the slit is from about 1 to about 2mm and the length of the slit is from about 5 to about 10 mm.

The gas inlet filter 20 is used to trap any dust or particles from a gas source (e.g., air), and the preferred pore size of the gas inlet filter is from about 0.2 μm to about 1 μm, more preferably from about 0.4 μm to about 0.6 μm. Preferred micropores or micro-slits that deliver gas into the fluid inlet chamber 11 of the assembly 22 are about 2 μm to about 70 μm, more preferably about 2 μm to about 45 μm. The fluid pump 12 is a submersible pump to produce a preferred flow rate of about 2,500L/hr to about 20,000L/hr, more preferably about 3,000L/hr to 12,000L/hr. The roughness elements 14 in the fluid outlet chamber 13 serve to disperse the bubbles generated by the transport of the fluid inlet chamber 11 to produce more uniform nanobubbles. The surface arithmetic mean roughness of the coarse assembly 14 is preferably about 5 μm to about 50 μm, more preferably about 5 μm to about 30 μm.

In one embodiment, when the gas source is ozone, ozone gas can be delivered to the nanobubble generator of the present invention, and the resulting ozone nanobubbles are used to reduce bacteria or algae in the nutrient aqueous medium of plants or fish. The fluid inlet filter 10, the fluid inlet chamber 11, the gas inlet filter 20, the gas inlet tube 21, the assembly 22 with micro-pores or micro-slits to deliver ozone gas, the fluid pump 12, the assembly 14 for dispersing gas bubbles in the fluid and the fluid outlet chamber 13 are made of a material having oxidation or ozone resistance.

Referring to the schematic diagram of the system of the present invention in fig. 3, the system for generating nanobubbles in a fluid in which plants or fishes are present comprises at least one nanobubble generator 601 (such as the nanobubble generator described in fig. 1) to generate nanobubbles and increase the amount of dissolved gas, a control system 301 comprising a plurality of electronic units 302, oil-

free air pumps

304 and 306, an ozone generator 303, a dissolved ozone measuring device 307, an electromagnetic control valve 308, and a check valve 309, and a fluid quality monitoring system 501 comprising a liquid crystal display panel 502 to display measured parameters of dissolved oxygen, pH, conductivity, water temperature, and ambient temperature.

Within this control system 301, the electronics unit 302 includes various electronic components, such as a 24V power supply, relays, a Programmable Logic Controller (PLC), to control the operation of the nanobubble generator 601, the pump 304, the pump 306, the corona discharge ozone generator 303, and the solenoid control valve 308. The check valve 309 is used to control the direction of the gas that generates the nano-bubbles by using air/oxygen or ozone gas generated by the corona discharge ozone generator 303 in the present invention. When air nanobubbles or oxygen nanobubbles are required to increase the dissolved oxygen in the fluid, a gas such as air or oxygen will be pumped through the pump 304 and the gas flow rate is controlled by the gas flow meter 305. The gas flow rate of the pump 304 is preferably from about 100L/hr to about 400L/hr, more preferably from about 200L/hr to about 300L/hr.

The diameter of the nanobubbles may be further controlled by the gas flow meter 305. The nanobubble-generating gas flow rate is preferably from about 15 mL/min to about 400 mL/min, more preferably from about 34 mL/min to about 200 mL/min. When ozone nanobubbles are required for water disinfection (e.g., to reduce bacteria or algae in the fluid), air or oxygen is delivered to the ozone generator 303 and ozone gas is generated and directed to the gas flow meter 305. A corona discharge ozone generator is used in the present invention.

The ozone flow rate to generate ozone nanobubbles is preferably from about 15 mL/min to about 400 mL/min, more preferably from about 34 mL/min to about 100 mL/min. The diameter of the ozone nanobubbles may be further controlled by the gas flow meter 305. The nanobubble-generating gas flow rate is preferably from about 15 mL/min to about 150 mL/min, more preferably from about 34 mL/min to about 100 mL/min. Dissolved ozone measurement device 307 has an internal pump to take a water sample from the nanobubble fluid to measure and display the concentration of ozone in the aqueous medium from about 0ppm to about 20 ppm.

In addition, a Programmable Logic Controller (PLC) in the electronics unit 302 is used to control the operating frequency of the pump 306 and solenoid control valve 308, and the solenoid control valve 308 is used to deliver a gas flow rate of preferably about 2,000L/hr to about 4,000L/hr to the module 22 to remove any undissolved aggregate particles in the nutrient aqueous medium of the plants or fish or metabolic waste products of the fish that have adhered to the surface of the micropores or microgrooves to stably produce nanobubbles. In addition, a Programmable Logic Controller (PLC) in the electronics unit 302 is also used to control the operating frequency of the pump 306 to deliver an air flow rate, preferably from about 2,000L/hr to about 4,000L/hr, to the coarse assembly 14 to remove any dirt, such as any undissolved agglomerated particles in the nutrient aqueous medium of plants or fish or metabolic waste products of fish that have adhered to the surface of the coarse assembly 14. Thus, the roughness elements 14 are selected from the group consisting of porous ceramic tubes, porous stainless steel tubes, porous glass tubes, porous high density polyethylene tubes, porous polycarbonate tubes, and porous titanium tubes to allow gas to pass from the middle of the tubes to the surface of the tubes to remove any attached fouling. A Residual Current Circuit Breaker (RCCB) is also included in the electronics unit 302 to prevent ground faults.

Dissolved oxygen in water is an important parameter for the survival and growth of plants or fish. The amount of dissolved oxygen in water is affected by the temperature of the water and the ambient temperature. The growth of each plant or fish requires a specific pH and conductivity in the water, and the fluid quality monitoring system 501 of the present invention is used to monitor the amount of dissolved oxygen, pH, conductivity, water temperature, and ambient temperature. In the present invention, the fluid quality monitoring system 501 with the liquid crystal display panel 502 is used to display the measured parameters of dissolved oxygen, pH, conductivity, water temperature and ambient temperature. Dissolved oxygen probe 504 is connected to the electronic board of fluid quality monitoring system 501 to measure the concentration of dissolved oxygen in the fluid from about 0mg/L to about 100 mg/L. The pH probe 505 is connected to the electronic board of the fluid quality monitoring system 501 to measure the pH in the fluid from about 1 to about 14. The conductivity probe 506 is connected to an electronic board of the fluid quality monitoring system 501 to measure conductivity, which is about 5 μ S/cm to about 200,000 μ S/cm. The temperature probe 507 is connected to the electronics board of the fluid quality monitoring system 501 to measure the fluid temperature, from about-55 ℃ to about 125 ℃. The ambient temperature sensor is connected to the electronic board of the fluid quality monitoring system 501 to measure ambient temperature, from about-55 ℃ to about 125 ℃. All measurement parameters such as dissolved oxygen, pH value, conductivity, water body temperature and environment temperature are displayed by the liquid crystal display panel 502, and the liquid crystal display panel 502 is connected to an electronic board of the fluid quality monitoring system 501.

The invention will now be explained in detail with reference to examples, which illustrate the features and effects of the system according to the invention, but are not intended to limit the invention thereto.

Example 1

As shown in FIG. 1, the nano-bubble generator is used to generate nano-bubbles in an 80L water tank filled with ultrapure water. The flow rate of the submersible pump 12 was 3,000L/hr and the gas flow rate into 21 was 34 mL/min. The nanobubble generator was allowed to operate for 24 hours before measuring nanobubble size and nanobubble concentration while recording data on dissolved oxygen levels during operation. By Malvern^TMNanoSight^TMNS300 measures nanobubble diameter and nanobubble concentration and dissolved oxygen level by Hanna multiparameter HI 98196.

The average diameter of the bubbles generated by the nano-bubble generator was 156nm, the SD was 49.1nm, the D10 was 99.7nm, the D50 was 149.3nm, the D90 was 218.1nm, and the average concentration of nano-bubbles was 1.03X 10 per ml⁸And (4) air bubbles. The dissolved oxygen level was 91.3%. The distribution of bubble diameter and concentration is shown in fig. 2.

Example 2

As shown in FIG. 1, the nano-bubble generator is used to generate nano-bubbles in an 80L water tank filled with ultrapure water. The flow rate of the submersible pump 12 was 12,000L/hr and the gas flow rate into 21 was 100 mL/min. Allowing the nanobubble generator to operate for 24 hours before measuring nanobubble size and nanobubble concentration, while recording dissolved oxygen levels during operationAnd (4) data. By Malvern^TMNanoSight^TMNS300 measures nanobubble diameter and nanobubble concentration and dissolved oxygen level by Hanna multiparameter HI 98196.

The average diameter of the bubbles generated by the nano-bubble generator was 177nm, the SD was 63.4nm, the D10 was 128.6nm, the D50 was 142.2nm, the D90 was 247.3nm, and the average concentration of nano-bubbles was 2.61X 10 per ml⁷And (4) air bubbles. The dissolved oxygen level was 88.2%. The distribution of bubble diameter and concentration is shown in fig. 2.

Example 3

As shown in fig. 1, the nanobubble generator is used to remove escherichia coli and algae in 50L water containing metabolic waste of freshwater fish. The flow rate of the submersible pump 12 was 3,000L/hr and the inlet ozone flow rate into 21 was 34 mL/min. The initial and final contents of E.coli and algae were measured by membrane filtration and phytoplankton analyzer (Walz, Phyto-PAM-II), respectively.

After 4 hours of operation, more than 90% of E.coli (initial: 5,267cfu/100 mL) and 26% of algae (initial 12.6 ppb) were removed.

Example 4

Gem weever

As shown in figure 1, the nano-bubble generator is used for generating nano-bubbles in 90L water for feeding freshwater fishes, namely jade perches. The flow rate of the submersible pump 12 was 3,000L/hr and the gas flow rate into 21 was 200 mL/min. The pH value of the fresh water is 6-7, and the water temperature is 22-25 ℃. The nanobubble generator is operated throughout the growth phase (i.e., 21 days) of the jade perch. A control experiment was performed on the same number of fish in a separate aquarium with the same moisture conditions using commercially available aeration stones instead of the nanobubble generator. In the fish tank having the nano bubble generator and the aeration stone, dissolved oxygen was 6ppm and 5ppm, respectively. Before and after the growth period, the fish in the two fish tanks were weighed separately. The growth rate of jade perches using the nanobubble generator was 44%, while the growth rate of jade perches in the bubblelite system was only 16%. With the nanobubble generator of the present invention, the growth rate of jade perches is about twice that of aerated stone systems.

Seaman flounder

As shown in FIG. 1, the nano-bubble generator of the present invention is used for generating nano-bubbles in 90L of water used for rearing the seawater fish, such as the saloon wharffish. The flow rate of the submersible pump 12 was 3,000L/hr and the gas flow rate into 21 was 100 mL/min. The pH value of the seawater is 6.5-7.5, the salinity is 27-30ppt, and the water temperature is 23-26 ℃. The nanobubble generator operates throughout the growth period (i.e., 31 days) of the saloon wharffish. A control experiment was performed on the same number of fish in a separate aquarium with the same moisture conditions using commercially available aeration stones instead of the nanobubble generator. In the fish tank having the nano bubble generator and the aeration stone, dissolved oxygen was 7ppm and 5ppm, respectively. Before and after the growth period, the fish in the two fish tanks were weighed separately. The growth rate of the flounder using the nano-bubble generator was 67%, while the growth rate of the flounder in the aerated stone system was 61%. With the nano-bubble generator, the growth rate of the saloon wharffish is about 10% higher than that in the aerated stone system.

Example 5

As shown in fig. 1, the nano-bubble generator of the present invention was used to generate nano-bubbles in 50L of nutrient water from seeds of germinating ice-leaf sunflowers. The flow rate of the submersible pump 12 was 3,000L/hr and the gas flow rate into 21 was 34 mL/min. The pH value of the nutrient solution is 6.5-7, the electric conductivity is 300-500 mu S/cm, and the nutrient temperature is 19-27 ℃. The sponge for seed germination was soaked in the nutrient solution for 24 hours and then transferred to a seed germination tray. The nutrient solution containing nanobubbles was poured into the seed germination tray until the sponge edge. The control experiment was performed in an environment with the same nutrient solution conditions without using a nanobubble generator. The dissolved oxygen in the nanobubble system and the control system exceeds 7ppm and 3-5ppm, respectively. Using the nutrient solution containing nanobubbles, the germination rate of the seeds of the flowers in the ice leaf day was 30%, while the germination rate of the seeds of the nutrient control group was 22%. With the nanobubble generator, the seed germination rate of the ice leaf day flowers was improved by more than about 30%.

Example 6

As shown in fig. 3, the nanobubble system of the present invention is used to generate nanobubbles in the nutrient solution of a hydroponic system for growing watermelons. The nanobubble generator 601 has a fluid flow rate of 3,000L/hr and 305 controls an air flow rate of 34 mL/min. The pH value of the nutrient solution is 6-8, the electric conductivity is 1,300-1,600 mu S/cm, and the nutrient temperature is 25-27 ℃. The nanobubble system operates throughout the growth phase of the water dishes (i.e., 30 days). Control experiments were also performed in an environment with the same nutrient conditions without the use of a nanobubble system. The dissolved oxygen in the nutrient water tank using the nanobubble system and the control system exceeds 7ppm and 6ppm, respectively. Watercress grown in both systems were harvested 30 days after sowing. The harvested water spinach grown using the nanobubble system of the present invention weighs about 20% more than a water spinach grown without the nanobubble system of the present invention.

References in the specification to "one embodiment," "an example embodiment," etc., indicate that the embodiment described may include a particular feature, structure, or characteristic, but every embodiment may not necessarily include the particular feature, structure, or characteristic. Moreover, such phrases are not necessarily referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with an embodiment, it is submitted that it is within the knowledge of one skilled in the art to affect such feature, structure, or characteristic in connection with other embodiments whether or not explicitly described.

The recitation of values by range format is intended to be interpreted in a flexible manner to include not only the numerical values explicitly recited as the limits of the range, but also to include all the individual numerical values or sub-ranges encompassed within that range as if each numerical value and sub-range is explicitly recited. For example, a concentration range of "about 0.1% to about 5%" should be interpreted to include not only the explicitly recited concentration of about 0.1wt.% to about 5wt.%, but also include individual concentrations (e.g., 1%, 2%, 3%, and 4%) and the sub-ranges (e.g., 0.1% to 0.5%, 1.1% to 2.2%, and 3.3% to 4.4%) within the indicated range.

As used in this document, the terms "a" or "an" are intended to include one or more than one, and the term "or" is intended to refer to a non-exclusive "or," unless otherwise indicated. Also, it is to be understood that the phraseology or terminology employed herein, and not otherwise defined, is for the purpose of description and not of limitation. Further, all publications, patents, and patent documents referred to in this document are incorporated by reference in their entirety into this document, as if individually incorporated by reference. If usage between this document and those incorporated by reference is inconsistent, then usage in the incorporated references should be considered supplementary to usage in this document; for irreconcilable inconsistencies, the usage in this document shall prevail.

In the methods described in this document, steps may be performed in any order, unless time or order of operation is explicitly recited, without departing from the principles of the invention. The recitation in the claims that a step is first performed and then several other steps are performed shall be taken to mean that the first step is performed before any other step, but the other steps may be performed in any suitable order unless an order is further recited in the other steps. For example, the recitation in the claims of "step A, step B, step C, step D, and step E" should be interpreted to mean that step A is performed first and step E is performed last, while steps B, C and D may be performed in any order between steps A and E and still be within the literal scope of the claimed process. A given single step or subset of steps may also be repeated.

Furthermore, certain steps may be performed concurrently, unless explicitly stated in the claims as being performed separately. For example, the claimed steps of performing X and the claimed steps of performing Y may be performed simultaneously in a single operation, and the resulting process will be within the literal scope of the claimed process.

The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments and examples are, therefore, to be considered in all respects as illustrative and not restrictive. The scope of the invention is indicated by the appended claims rather than by the foregoing description, and all changes that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

Claims

1. A system for generating nanobubbles in a fluid in which plants or fish are located, comprising:

at least one nanobubble generator for generating nanobubbles and increasing the amount of dissolved gas; and

a control system for controlling the operation of the motor,

the control system comprises a plurality of electronic units, at least two electromagnetic control valves, at least three check valves, at least two air pumps for controlling the generation of nano bubbles and periodically and automatically cleaning the nano bubble generator, a gas flowmeter, an ozone generator, a dissolved ozone measuring device and a fluid quality monitoring system comprising a liquid crystal display panel for displaying measured parameters.

2. The system of claim 1, wherein the nanobubble generator comprises a fluid chamber inlet filter, a fluid inlet chamber, a gas inlet filter, a gas inlet tube, a component for delivering gas having micro-pores or micro-slits, a fluid pump, a rough component for dispersing bubbles in a fluid, and a fluid outlet chamber.

3. The system of claim 1 or 2, wherein the fluid is ultrapure water, distilled water, tap water, or a nutrient aqueous medium for plants or fish.

4. The system of claim 1 or 2, wherein the nanobubbles have an average bubble diameter of about 100nm to about 500 nm.

5. The system of claim 1 or 2, wherein the nanobubbles have a concentration of at least about 1 x 10 per milliliter of fluid⁷And (4) air bubbles.

6. The system of claim 1 or 2, wherein the gas comprises air, oxygen, ozone, and mixtures of any of the above.

7. The system of claim 2, wherein the fluid chamber inlet filter has a slit width of about 0.5mm to about 3 mm; the slit length is about 5mm to about 15 mm.

8. The system according to claim 2, wherein the pore size of the gas inlet filter of the nanobubble generator is about 0.5 μm.

9. The system of claim 2, wherein the micro-pores or micro-slits of the assembly having micro-pores or micro-slits to convey gas are about 2 μm to about 70 μm.

10. The system of claim 2, wherein the fluid pump is a submersible pump having a fluid flow rate of about 2,500L/hr to about 20,000L/hr.

11. The system of claim 2, wherein the roughened component is selected from the group consisting of porous ceramic tubing, porous stainless steel tubing, porous glass tubing, porous high density polyethylene tubing, porous polycarbonate tubing, and porous titanium tubing.

12. The system of claim 2, wherein the surface arithmetic mean roughness of the roughness component to disperse bubbles in the fluid is about 5 μm to about 50 μm.

13. The system of claim 2, wherein the fluid chamber inlet filter, the fluid inlet chamber, the gas inlet filter, the gas inlet tube, the component to deliver gas and having micro-pores or micro-slits, the fluid pump, the component to disperse bubbles in fluid, and the fluid outlet chamber are made of a material that is oxidation or ozone resistant.

14. The system of claim 1 or 2, wherein the plurality of electronic units comprise a power source, relays, and a programmable logic controller for controlling the generation of nanobubbles, controlling the type of gas delivered, and automatically periodically cleaning the nanobubble generator.

15. The system according to claim 1 or 2, wherein the plurality of electronic units comprise residual current circuit breakers to prevent earth faults.

16. The system of claim 1 or 2, wherein the solenoid control valve and the check valve within the control system are made of a material having oxidation or ozone resistance.

17. The system of claim 1 or 2, wherein the at least two gas pumps are oil-free gas pumps, one of which delivers gas to the assembly having micro-pores or micro-slits at a gas flow rate of about 100L/hr to about 400L/hr at the fluid inlet chamber of the nanobubble generator during nanobubble generation.

18. The system of claim 1 or 2, wherein the gas flow meter is used to further control the diameter of the nanobubbles and to control the gas flow rate between about 15 mL/min to about 400 mL/min.

19. The system of claim 1 or 2, wherein the at least two gas pumps are oil-free gas pumps, one of which delivers gas at a flow rate of about 2,000L/hr to about 4,000L/hr to the micro-porous or micro-slit component and/or the coarse component within the fluid outlet chamber at the fluid inlet chamber of the nanobubble generator to remove any undissolved agglomerated particles in the plant or fish nutritive aqueous medium or fish or plant metabolic waste attached to the surface of the component.

20. The system of claim 1 or 2, wherein the ozone generator is a corona discharge ozone generator.

21. The system of claim 1 or 2, wherein the dissolved ozone measuring device is used to measure and display ozone concentrations in the aqueous medium between about 0ppm to about 20 ppm.

22. The system of claim 1 or 2, wherein the fluid quality monitoring system is coupled to a dissolved oxygen probe to measure a dissolved oxygen concentration in the fluid between about 0mg/L to about 100 mg/L.

23. The system of claim 1 or 2, wherein the fluid quality monitoring system is coupled to a pH probe to measure pH values in the fluid between about 1 to about 14.

24. The system of claim 1 or 2, wherein the fluid quality monitoring system is connected with a conductivity probe to measure conductivity between about 5 μ S/cm to about 200,000 μ S/cm.

25. The system of claim 1 or 2, wherein the fluid quality monitoring system is connected to a temperature probe to measure temperatures between about-55 ℃ to about 125 ℃ fluid.

26. The system of claim 1 or 2, wherein the fluid quality monitoring system is coupled to a temperature sensor to measure a near ambient temperature between about-55 ℃ to about 125 ℃.