A micro-nano steam stripping type water supply system and a water supply method

Abstract

The application provides a micro-nano stripping type water supply system and a water supply method, and relates to the technical field of raw water treatment. The water supply system comprises a filter tank internally provided with filter material, and the filter material separates the filter tank into an upper water inlet section and a lower water outlet section. The water to be treated sequentially passes through the water inlet section, the filter material and the water outlet section in the filter tank. The water supply system further comprises a generating device provided with a micro-nano bubble output port, and the liquid in the filter tank at least partially passes through the output port, and the output port is located in the filter material and / or upstream of the filter material. The water supply system further comprises a collecting device comprising at least one collecting inlet, and the collecting inlet is located at the water surface of the water body in the filter tank. The diameter of the micro-nano bubbles is 50 nanometers to 100 micrometers. The generating device outputs micro-nano bubbles, and the collecting device removes part of impurities in the water to be treated adsorbed by the micro-nano bubbles, thereby prolonging the backwashing time, improving the microbial reproduction cycle, and further improving the filtration effect and filtration efficiency.

Description

Technical Field

[0001] This invention relates to the field of raw water treatment technology, and in particular to a micro-nano stripping water supply system and water supply method. Background Technology

[0002] Industrial water treatment can be divided into two distinct areas: wastewater treatment and raw water treatment. Although both involve similar steps such as sedimentation, filtration, and some biological treatment, the processes, target pollutants, and post-treatment standards differ significantly between wastewater and raw water. For example, target pollutants in raw water treatment include algae, 2-MIB, GSM, and powdered activated carbon added at the front end for pollutant removal, while wastewater treatment does not have these target pollutants. Therefore, the treatment processes for wastewater and raw water are not interchangeable.

[0003] In some existing raw water treatment devices, porous granular materials such as quartz sand, anthracite, or activated carbon are typically used as filter media in the filtration tank to remove fine suspended particles, colloidal substances, and some organic impurities from the water. Consequently, after a period of water filtration, the fine suspended particles and colloidal substances in the water can clog the filter media or the gaps between the filter media, reducing the filtration rate. Therefore, to ensure the efficiency of water filtration, it is necessary to backwash the filter media in the filtration tank regularly.

[0004] In actual operation, considering that the filtration rate in the filter tank needs to match the influent and effluent rates, the filter media of the filter tank generally needs to be backwashed once every 24 hours. However, such frequent backwashing operations increase the water treatment time and reduce the water treatment efficiency. On the other hand, the microorganisms attached to the filter media that can remove organic pollutants are washed away, reducing the microbial content and slowing down the reproduction rate of microorganisms, thereby reducing the filtration effect of the filter tank on the water. Summary of the Invention

[0005] To address the aforementioned technical problems, this invention provides a micro / nano stripping water supply system and method. The system generates micro / nano bubbles, and a collection device removes some impurities adsorbed by these bubbles from the water to be treated. This extends the backwashing time, improves the microbial reproduction cycle, and thus enhances the filtration effect and efficiency. The technical solution is as follows:

[0006] This invention specifically provides a micro-nano stripping water supply system, including a filter tank with filter media inside, wherein the filter media divides the filter tank into an upper inlet section and a lower outlet section. The water to be treated passes sequentially through the inlet section, the filter media, and the outlet section within the filter tank. The system also includes: a generating device with a micro-nano bubble outlet, through which at least a portion of the liquid in the filter tank passes, and the outlet is located within and / or upstream of the filter media; and a collecting device including at least one collecting inlet located at the water surface within the filter tank; wherein the diameter of the micro-nano bubbles is 50 nanometers to 100 micrometers.

[0007] Furthermore, the outlet is positioned above the liquid surface within the filtration tank.

[0008] Furthermore, the distance between the outlet and the top surface of the filter tank is 30 to 100 centimeters.

[0009] Furthermore, the collection device includes a collection tube and a negative pressure vacuum mechanism. One end of the collection tube is open to the collection inlet, and the other end is located outside the filter tank and connected to the negative pressure vacuum mechanism.

[0010] Furthermore, the collection device includes a collection pipe, one end of which is the collection inlet and is located inside the filter tank, and the other end is located outside the filter tank. The end located inside the filter tank is positioned 0.5 to 5 cm below the water surface in the filter tank and higher than the other end opening.

[0011] Furthermore, the collection device also includes a displacement mechanism, which is driven to connect to the collection pipe and drives the collection inlet of the collection pipe to rise and fall synchronously with the water level in the filter tank.

[0012] Furthermore, it also includes a spraying mechanism, which includes at least one nozzle that sprays liquid through the nozzle. The nozzle is located at the edge of the filter tank and its outlet faces the collection pipe.

[0013] Furthermore, it also includes a mounting bracket, and the spraying mechanism also includes an elastic element. The nozzle is mounted on the mounting bracket via the elastic element. The elastic element deforms with the change of water pressure inside the nozzle, and the orientation of the nozzle outlet changes with the deformation of the elastic element.

[0014] Furthermore, the outlet is located inside the filter media within the filtration tank.

[0015] Furthermore, the generating device also includes multiple pipes, each of which has an open end as an output port. The multiple pipes are respectively arranged around the filter media in the filtration tank, and the multiple output ports of the multiple pipes are evenly spaced inside the filter media.

[0016] The present invention also provides a micro-nano stripping water supply method, the method comprising: mixing micro-nano bubbles with water to be treated, and then filtering the water to be treated after being treated with and separated from the micro-nano bubbles; wherein the diameter of the micro-nano bubbles is 50 nanometers to 100 micrometers.

[0017] Furthermore, the mixing of micro-nano bubbles with the water to be treated specifically includes: mixing the micro-nano bubbles with the water to be treated for 30 seconds to 10 minutes, and adsorbing impurities in the water to be treated before floating to the surface.

[0018] Furthermore, the water body to be treated, which has been treated with micro-nano bubbles and separated from the micro-nano bubbles, is then filtered. Specifically, the water body to be treated, which has been treated with micro-nano bubbles and separated from the micro-nano bubbles, is filtered through filter media, and the filter media is replaced or backwashed after continuous filtration for 24-72 hours.

[0019] The beneficial effects of this invention are:

[0020] First, extensive observational experiments have shown that the micro-nano stripping water supply system of this invention can extend the backwashing frequency of the filter tank from once every 24 hours to once every 48-72 hours, thus extending the backwashing cycle and reducing the number of backwashings, thereby improving filtration efficiency. The extended backwashing cycle reduces damage and consumption of microorganisms, and the increased dissolved oxygen content in the water by the micro-nano bubbles enhances the activity, content, and peak value of microorganisms within the filter tank, further improving the purification effect.

[0021] Secondly, through numerous comparative experiments, it was found that the micro-nano stripping water supply system of the present invention improves the removal efficiency of pollutants such as 2-methylisoborneol (2-MIB), GSM, suspended solids, Al, and algae. In particular, the micro-nano stripping water supply system of the present invention can remove 20%-30% of 2-methylisoborneol, which greatly improves the purification effect.

[0022] Finally, the micro-nano stripping water supply system of the present invention does not require the addition of a new cleaning reaction tank. It only requires the addition of a generating device and a collecting device to the existing filter tank. The footprint is not increased, the operating cost is not significantly increased, and the water purification effect is greatly improved, making it easy to promote and apply. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments of the present invention will be briefly introduced below.

[0024] Figure 1 This is a block diagram of a micro-nano stripping water supply system in one embodiment;

[0025] In all views, the same label indicates equivalent or similar parts or components.

[0026] 10. Filter tank; 20. Generating device; 30. Collection device. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0028] In the description of this specification, the terms "Embodiment 1," "this embodiment," or "in one embodiment," etc., indicate that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example; moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in one or more embodiments or examples.

[0029] In the description of this specification, the terms "connection," "installation," "fixing," "setting," and "having" are interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In the description of this specification, relational terms such as “first” and “second” are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitation, an element defined by the phrase “comprising one…” does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0031] In one embodiment, such as Figure 1 As shown, a micro-nano stripping water supply system includes a mounting frame, a filter tank 10, and a generating device 20 and a collecting device 30 mounted on the mounting frame. The filter tank 10 contains filter media that divides it into an upper inlet section and a lower outlet section. The water to be treated passes sequentially through the inlet section, filter media, and outlet section of the filter tank 10, removing fine suspended particles, colloidal substances, and some organic impurities. The generating device 20 has a micro-nano bubble outlet. At least a portion of the liquid in the filter tank 10 passes through the outlet, which is located within and / or upstream of the filter media. The collecting device 30 includes at least one collecting inlet located at the water surface within the filter tank 10, allowing substances on the surface of the liquid in the filter tank 10 to enter the collecting inlet.

[0032] The filter media can be quartz sand, activated carbon, magnetite, anthracite, etc., as well as microorganisms attached to the aforementioned filter media. Micro-nano bubbles refer to bubbles with a diameter between 50 nanometers and 100 micrometers, formed by the dissolution of gas under pressure in water. Unlike ordinary bubbles, larger micro-nano bubbles carry a higher negative charge, allowing them to adsorb positively charged substances in the water. Therefore, they can adsorb and separate some impurities from the water to be treated. Furthermore, micro-nano bubbles can generate a large number of hydroxyl radicals, which can oxidize and decompose some difficult-to-degrade organic pollutants. On the other hand, smaller micro-nano bubbles have a slow rising speed and self-pressurized dissolution characteristics, thus greatly increasing the solubility of gases (air, oxygen, ozone, carbon dioxide, etc.) in water. Increased oxygen concentration enhances the biological activity of aerobic microorganisms in the water, accelerating the biodegradation process of pollutants in the water and achieving water purification.

[0033] In use, the generator 20 pressurizes and releases micro-nano bubbles through its output port. Under the pressure of the generator 20, more micro-nano bubbles enter a portion of the liquid in the filter tank 10, mixing with other liquids. The micro-nano bubbles can carry away some impurities in the liquid and float to the surface of the liquid in the filter tank 10. Impurities on the surface of the liquid in the filter tank 10 can enter the collection inlet and be removed by the collection device 30.

[0034] The backwashing frequency is determined by monitoring the filtration rate of filter tank 10. Normal filtration rates are typically controlled at 7-10 m / h. When the filtration rate of filter tank 10 falls below this baseline, it indicates that filter tank 10 can no longer meet filtration requirements and backwashing is necessary. Extensive observational experiments show that the micro-nano stripping water supply system of this embodiment can extend the backwashing frequency of filter tank 10 from once every 24 hours to once every 48-72 hours, extending the backwashing cycle, reducing the number of backwashes, and thus improving filtration efficiency. The extended backwashing cycle reduces damage and consumption of microorganisms. Micro-nano bubbles increase the dissolved oxygen content in the water by approximately 0.1-1 mg / L. The activity, content, and peak value of microorganisms within filter tank 10 are all enhanced. These microorganisms can degrade some organic pollutants, further improving the water purification effect.

[0035] Furthermore, through extensive comparative experiments, it was found that the micro-nano stripping water supply system of this embodiment further improves the removal efficiency of pollutants such as 2-methylisoborneol (2-MIB), geosmin (GSM), suspended solids, Al, pre-added powdered activated carbon, and algae. Specifically, the micro-nano stripping water supply system of this embodiment can achieve a 20%-50% removal rate for 2-methylisoborneol and a 30%-60% removal rate for GSM, significantly improving the water purification effect.

[0036] Moreover, the existing technology for removing 2-MIB commonly uses ozone activated carbon, with a construction cost of approximately 500-700 yuan / ton and an operating cost of approximately 0.05-0.15 yuan / ton, resulting in relatively high economic costs. In contrast, this embodiment removes 2-MIB and GSM using a micro-nano stripping process, with a construction cost of approximately 50-100 yuan / ton and an operating cost of approximately 0.003-0.01 yuan / ton, significantly reducing costs.

[0037] Furthermore, the micro-nano stripping water supply system of this embodiment does not require the addition of a new cleaning reaction tank. It only requires the addition of a generating device 20 and a collecting device 30 to the existing filter tank 10. The footprint is not increased and the operating cost is not significantly increased, but the water purification effect can be greatly improved, making it easy to promote and apply.

[0038] In other embodiments, the filter media can be installed vertically inside the filter tank 10, dividing the filter tank 10 into left and right sections, one for water inlet and the other for water outlet. In this case, the output port of the generator 20 is located in the section for water inlet; or the output port of the generator 20 is located outside the filter tank 10, so that the water to be treated passes through the output port before flowing into the filter tank 10, achieving the same effect. In other embodiments, the filter media can be vertically or horizontally configured with two or more channels according to actual filtration needs to ensure filtration effectiveness.

[0039] In one embodiment, the outlet is positioned above the liquid surface within the filter tank 10, and the water to be treated flows into the inlet section of the filter tank 10 from above the filter media through the outlet. The collection device 30 includes a collection pipe, one end of which is an inlet facing upwards within the filter tank 10. The other end of the collection pipe is located outside the filter tank 10, with the end inside the filter tank 10 positioned 0.5–5 cm below the water surface and higher than the other end. During operation of the micro-nano stripping water supply system, the generator 20 releases micro-nano bubbles through the outlet. These bubbles rise and dissolve into the water flowing down from above. The collection pipe is positioned below the liquid surface within the filter tank 10, allowing impurities adsorbed by the micro-nano bubbles to enter the collection pipe under gravity and be carried away and removed. Positioning one end of the collection pipe 0.5–5 cm below the water surface ensures that more impurities enter the collection pipe, resulting in a relatively small amount of water entering the collection pipe, thus conserving water resources. The collection inlet of the collection tube is designed as a shovel structure, which means that the cross-sectional area of ​​the collection inlet is larger than the cross-sectional area of ​​other parts of the collection tube. This structure can increase the area for removing impurities and improve the speed of impurity removal.

[0040] In one embodiment, the distance between the outlet and the top surface of the filter tank 10 is 30 to 100 centimeters. This distance allows the micro-nano bubbles to fully contact the water to be treated, better adsorb impurities and release oxygen, thereby improving the purification effect.

[0041] In other embodiments, the outlet is positioned between the filter media. This relative positioning increases the range of micro- and nano-bubbles in the water to be treated, allowing the micro- and nano-bubbles to function more effectively and improving the purification efficiency and effect of the micro- and nano-stripping water supply system. In other embodiments, the collection device 30 may also include a negative pressure vacuum mechanism. One end of the collection pipe located outside the filter tank 10 is connected to the negative pressure vacuum mechanism, which provides negative pressure to draw impurities from the surface of the water in the filter tank 10 through the collection pipe.

[0042] In one embodiment, the collecting device 30 includes a negative pressure vacuum mechanism. One end of the collecting tube is open as a collecting inlet, which is positioned downwards above or in contact with the liquid surface in the filter tank 10. The other end is open outside the filter tank 10 and communicates with the negative pressure vacuum mechanism. The negative pressure vacuum mechanism provides negative pressure inside the collecting tube, and the liquid surface in the filter tank 10 is within the negative pressure effect range of the collecting tube near the opening of the collecting tube near the filter tank 10. In use, the negative pressure vacuum mechanism sucks up impurities adsorbed by micro-nano bubbles from the surface of the liquid in the filter tank 10 through the collecting tube, reducing the clogging effect of impurities on the filter media in the filter tank 10 and extending the backwashing cycle of the filter tank 10. The negative pressure vacuum mechanism can be a vacuum pump or a negative pressure fan, etc. The opening of the collecting tube near the liquid surface can completely cover the liquid surface of the filter tank 10, or it can be positioned at a certain point on the liquid surface of the filter tank 10. The area of ​​the opening of the collecting tube near the liquid surface is larger than the cross-sectional area of ​​the other parts of the collecting tube, that is, the end of the collecting tube near the liquid surface is inverted funnel shape, which can increase the absorption area for impurities and improve the removal speed of impurities.

[0043] In one embodiment, the collection device 30 further includes a displacement mechanism that drives the collection inlet of the collection pipe to rise and fall synchronously with the water level in the filter tank 10. During use, changes in the liquid surface height within the filter tank 10 may occur due to factors such as the removal of some impurities by the collection pipe, an increase or decrease in the injection speed of the water to be treated, or a change in the filtration speed of the filter tank 10. In such cases, the displacement mechanism can alter the positional relationship between the collection pipe and the liquid level in the filter tank 10, driving the collection inlet of the collection pipe to rise and fall synchronously with the water level in the filter tank 10, ensuring that impurities can still enter the collection pipe and be removed. The displacement mechanism may include an air flotation device, a laser ranging and positioning device, etc. The laser ranging and positioning device can monitor the positional relationship between the collection inlet and the liquid level in the filter tank 10 in real time, and the air flotation device can change the position of the collection inlet of the collection pipe based on the feedback information from the laser ranging and positioning device.

[0044] In one embodiment, the micro-nano stripping water supply system further includes a spraying mechanism, which comprises at least one nozzle. The spraying mechanism sprays liquid through the nozzle, which is positioned along the edge of the filter tank 10 with its outlet facing the collection pipe. In use, when the spraying mechanism is activated, it sprays liquid through the nozzle towards the collection pipe. Under water pressure, the liquid sprayed from the nozzle falls onto the liquid surface of the filter tank 10, pushing impurities on the surface towards the collection pipe, thus increasing the removal range of impurities on the liquid surface. Furthermore, the spraying mechanism includes three nozzles, which, along with the collection pipe, are spaced at intervals along the edge of the filter tank 10 in the four cardinal directions (north, south, east, and west). This ensures that impurities at various locations on the filter tank 10 have a chance to be introduced into the collection pipe, improving the purification effect of the micro-nano stripping water supply system.

[0045] In one embodiment, the spraying mechanism further includes an elastic element. The nozzle is mounted on the mounting frame via the elastic element, and the elastic element deforms with changes in water pressure within the nozzle, causing the orientation of the nozzle outlet to change accordingly. Specifically, the spraying mechanism also includes a spray pipe connecting to the nozzle, through which liquid reaches the nozzle. The liquid sprayed into the nozzle can be directly taken from the filter tank 10, or it can come from tap water or water to be treated. The nozzle is mounted on the mounting frame via the spray pipe. The elastic element is a metal spring, with one end of multiple metal springs sequentially and fixedly connected to the mounting frame at intervals, and the other end sequentially and fixedly connected to the spray pipe along its axial direction. Thus, the spray pipe is suspended below the mounting frame by multiple metal springs.

[0046] Driven by internal water pressure, the water spray pipe moves. Limited by a metal spring, the pipe moves along the direction of the vertically positioned spring's force, meaning it displaces vertically. The nozzle connected to the pipe also moves vertically, altering its spray range. This allows a wider area of ​​impurities to be moved towards the collection pipe, improving the removal efficiency of the collection device 30. In other embodiments, the nozzle can be directly suspended from the mounting bracket by an elastic element. The connection between the nozzle and the water spray pipe can be a flexible hose or bellows pipe, further altering the spray range.

[0047] In one embodiment, the collecting device 30 further includes a collecting chamber connected to the collecting pipe, through which substances on the surface of the liquid in the filter tank 10 enter the collecting chamber. The collecting chamber is used to contain impurities on the surface of the liquid in the filter tank 10 and can be cleaned periodically. In other embodiments, the collecting device 30 further includes a discharge outlet connected to the collecting pipe and connected to an external sludge discharge trough, through which impurities collected by the collecting pipe are directly discharged into the sludge discharge trough.

[0048] In one embodiment, the outlet is located inside the filter media within the filter tank 10. Compared to placing it above the liquid surface in the filter tank 10, directly placing the outlet inside the filter media increases the contact area between the micro-nano bubbles and the liquid to be filtered. The micro-nano bubbles can carry away more impurities from the water, improving the purification effect, extending the backwashing cycle of the filter tank 10, and increasing filtration efficiency. Specifically, the outlet is located 0.5-5 cm below the water surface in the filter tank 10, and the rising speed of the micro-nano bubbles is between 0.01 m / h and 20 m / h.

[0049] In one embodiment, the generating device 20 further includes multiple pipes, each with an outlet at one end. The multiple pipes are respectively arranged around the filter media in the filter tank 10, and the multiple outlets of the multiple pipes are evenly spaced inside the filter media. The generating device 20 can deliver micro-nano bubbles to its multiple outlets through the multiple pipes. The evenly spaced multiple outlets can fully release micro-nano bubbles in the filter media. After the micro-nano bubbles in various directions float to the surface, they can come into contact with most of the water to be treated, adsorb more impurities, better extend the backwashing cycle, and improve the effect and efficiency of water treatment.

[0050] In one embodiment, a micro / nano stripping water supply method includes: mixing micro / nano bubbles with water to be treated, and then filtering the water that has been treated with and separated from the micro / nano bubbles; wherein the diameter of the micro / nano bubbles is 50 nanometers to 100 micrometers. This method utilizes the 50-nano to 100-micrometer microbubbles to fully absorb impurities in the water to be treated, reducing clogging of the filter media during subsequent filtration and extending the backwashing time.

[0051] In one embodiment, the micro-nano bubbles are mixed with the water to be treated. Specifically, the micro-nano bubbles are mixed with the water for 30 seconds to 10 minutes, and after adsorbing impurities in the water, they float to the surface. The micro-nano bubbles release oxygen into the water. A portion of the micro-nano bubbles also releases oxygen into the water, increasing the oxygen concentration in the water and facilitating the reproduction of microorganisms within the filter media. These microorganisms can further purify the water, improving the water treatment effect.

[0052] In one embodiment, separating the micro-nano bubbles adsorbed with impurities from the water treated with micro-nano bubbles specifically includes: removing the micro-nano bubbles adsorbed with impurities using negative pressure or drawing them out using their own gravity.

[0053] In one embodiment, a micro-nano stripping water supply method further includes pretreatment, which includes sedimentation, water softening, etc.

[0054] In one embodiment, a micro-nano stripping water supply method further includes subsequent filtration of the water body that has undergone micro-nano bubble treatment and separation from the micro-nano bubbles. Specifically, the water body that has undergone micro-nano bubble treatment and separation from the micro-nano bubbles is filtered through filter media, and the filter media is replaced or backwashed after continuous filtration for 24-72 hours. The purification effect is further improved after filtration through the filter media, and replacing or backwashing the filter media after continuous filtration for 24-72 hours ensures the filtration speed. The filter media used for filtration is one or more of quartz sand, activated carbon, magnetite, or anthracite; the porous filter media can adsorb a large number of impurities in the water body.

[0055] Experimental Section

[0056] To illustrate the solutions and effects of the above embodiments, a comparative analysis is provided in the experimental section. Specifically:

[0057] 1. Filtration rate test

[0058] Experimental conditions: Examples 1-3 all used the micro-nano stripping water supply system of the present invention. In Example 1, the outlet of the micro-nano bubbles was located upstream of the filter media in the filter tank; in Example 2, the outlet of the micro-nano bubbles was located on the upper surface of the filter media in the filter tank; in Example 3, the outlet of the micro-nano bubbles was located in the middle of the upper and lower layers of filter media in the filter tank. In the comparative examples, the micro-nano stripping water supply system of the present invention was not used, and the pre-treated water was directly filtered in the filter tank.

[0059] Experimental subject: Lake water was used as the raw water for the experiment.

[0060] Experimental Procedure: The raw water underwent pretreatment processes such as sedimentation, coagulation, flocculation, and water softening. The pretreated water was then introduced into a filtration tank for filtration. The contents of 2-MIB, GSM (geosin), algae, and oxygen consumption in the filtered raw water were measured using instruments. The filtration rate of the filtration tanks in the three examples and the comparative example was measured after 24 hours and 48 hours of filtration, respectively. The backwashing cycle of the filtration tanks in the three examples and the comparative example was also monitored and determined.

[0061] The steps for calculating the filtration rate include: 1. Recording the effective filtration area of ​​the filter tank; 2. Recording the water level in the filter tank; 3. Opening the drain valve and recording the drainage volume over 10 minutes; 4. Closing the drain valve, calculating the drainage volume and dividing it by the effective filtration area of ​​the filter tank to obtain the filtration rate of the filter tank.

[0062] The formula for calculating the filtration rate is: Filtration rate of the filter tank = drainage volume ÷ filtration area ÷ drainage time.

[0063] Experimental results: See Table 1

[0064] Table 1. Results of Filtration Rate and Pollutant Removal Tests

[0065] project Comparative Example Example 1 Example 2 Example 3 Backwash cycle (h) 24 48 60 72 Filtration rate (m / h) of the filter bed after 24 hours 5 8 9 10 Filtration rate (m / h) of the filter bed after 48 hours 3 6 7 8 2-MIB (ng / L) 52 38 36 33 GSM (ng / L) 28 14 12 10 Algae (number / L) 88 0 0 0

[0066] 2. Microbial proliferation assay

[0067] Experimental conditions: Examples 1-3 all used the micro-nano stripping water supply system of the present invention. In Example 1, the outlet of the micro-nano bubbles was located upstream of the filter media in the filter tank; in Example 2, the outlet of the micro-nano bubbles was located on the upper surface of the filter media in the filter tank; in Example 3, the outlet of the micro-nano bubbles was located in the middle of the upper and lower layers of filter media in the filter tank. In the comparative examples, the micro-nano stripping water supply system of the present invention was not used, and the pre-treated water was directly filtered in the filter tank.

[0068] Experimental subject: Lake water was used as the raw water for the experiment.

[0069] Experimental procedure: The raw water was pretreated by sedimentation, coagulation, flocculation and water softening. The pretreated water was then put into the filter tank for filtration. After a certain period of time, the filter tank was backwashed. After one month of continuous operation, the bacterial colony structure on the surface of the filter media was sampled and sent to a testing agency for testing and analysis.

[0070] Experimental results: See Table 2

[0071] Table 2 Results of Colony Structure Analysis in Filter Media

[0072]

[0073] Note: In the table, functional genes refer to genes that have functions of amino acid metabolism and transport, energy production and transport, and gene replication, recombination and repair.

[0074] Data Analysis

[0075] As can be seen from the experimental results in Tables 1 and 2 above, compared with the comparative examples, the embodiments in this application have the following clear advantages:

[0076] 1. The micro-nano stripping water supply system of the present invention can greatly improve the removal effect of algae, 2-MIB and GSM, and improve the purification effect of raw water.

[0077] 2. After improving the removal rate of algae and other impurities, the degree of clogging of the filter media in the filter tank per unit time is reduced, the backwashing or replacement cycle of the filter tank is extended, the working time of the filter tank is increased, and the water treatment efficiency is improved.

[0078] 3. Extending the backwashing or replacement cycle reduces the damage to microorganisms that can decompose pollutants. At the same time, micro-nano bubbles increase the oxygen content in the raw water. Together, they enhance the activity, content, and peak value of microorganisms on the filter media surface, making the functions more diverse. Microorganisms can degrade some organic pollutants, further improving the purification effect.

[0079] The above description of the embodiments is intended to enable those skilled in the art to understand and apply the technology of this invention. Those skilled in the art can easily make various modifications to these examples and apply the general principles described herein to other embodiments without creative effort. Therefore, this invention is not limited to the above embodiments. Modifications in the following situations should be within the scope of protection of this invention: ① New technical solutions implemented based on the technical solution of this invention and combined with existing common knowledge, where the technical effects of the new technical solution do not exceed the technical effects of this invention; ② Equivalent substitutions of some features of the technical solution of this invention using known technology, resulting in the same technical effects as those of this invention; ③ Extendable technical solutions based on the technical solution of this invention, where the substantive content of the extended technical solution does not exceed the technical solution of this invention; ④ Equivalent transformations made using the content of this specification and drawings, directly or indirectly applied to other related technical fields.

Claims

1. A micro-nano stripping water supply system, comprising a filter tank internally equipped with filter media, wherein the filter media divides the filter tank into an upper inlet section and a lower outlet section, and water to be treated sequentially passes through the inlet section, the filter media, and the outlet section within the filter tank, characterized in that, Also includes: Mounting rack; The generating device is provided with an outlet for micro-nano bubbles, and at least part of the liquid in the filtration tank passes through the outlet, which is located inside the filter media. A collection device includes at least one collection inlet. The collection device includes a collection pipe, one end of which is the collection inlet and is located inside the filter tank, and the other end is located outside the filter tank. The one end located inside the filter tank is located 0.5 to 5 cm below the water surface in the filter tank and higher than the other end. The collection inlet of the collection pipe is configured as a shovel structure. A liquid spraying mechanism includes an elastic element, at least one nozzle, and a water spray pipe communicating with the nozzle. Liquid reaches the nozzle through the water spray pipe, and the liquid spraying mechanism sprays liquid through the nozzle. The nozzle is disposed on the edge of the filter tank and its outlet faces the collection pipe. The nozzle is mounted on the mounting bracket via the elastic element. The elastic element deforms as the water pressure inside the nozzle changes, and the orientation of the nozzle outlet changes as the elastic element deforms. The elastic element is a metal spring. One end of the metal spring is fixedly connected to the mounting bracket, and the other end is fixedly connected to the water spray pipe. The water spray pipe is suspended below the mounting bracket by the metal spring. The water spray pipe will move under the drive of the internal water pressure. Under the restriction of the metal spring, the direction of movement of the water spray pipe is along the direction of the elastic force of the vertically set metal spring. That is, the water spray pipe is displaced in the vertical direction. The nozzle connected to the water spray pipe also moves in the vertical direction. The spray range of the nozzle also changes, thereby driving impurities in a wider range to move towards the collection pipe. The micro-nano bubbles have a diameter of 50 nanometers to 100 micrometers. The micro-nano bubbles mix with the water to be treated for 30 seconds to 10 minutes, and after adsorbing impurities in the water, they float to the surface. The water flow sprayed by the spraying mechanism impacts the impurities, causing them to converge at the collection inlet of the collection tube and be discharged from the collection tube.

2. The micro-nano stripping water supply system as described in claim 1, characterized in that, The collection device also includes a displacement mechanism, which is driven to the collection pipe and drives the collection inlet of the collection pipe to rise and fall synchronously with the water level in the filter tank.

3. The micro-nano stripping water supply system as described in claim 1, characterized in that, The generating device also includes multiple pipes, each of which has an open end as an output port. The multiple pipes are respectively arranged around the filter media in the filtration tank, and the multiple output ports of the multiple pipes are evenly spaced inside the filter media.

4. A micro-nano stripping water supply method, employing the micro-nano stripping water supply system as described in any one of claims 1-3, characterized in that, The method includes: mixing micro-nano bubbles with water to be treated, and then filtering the water to be treated after being treated with and separated from the micro-nano bubbles; wherein the diameter of the micro-nano bubbles is 50 nanometers to 100 micrometers.

5. The micro-nano stripping water supply method as described in claim 4, characterized in that, The process of mixing micro-nano bubbles with the water to be treated specifically includes: mixing the micro-nano bubbles with the water to be treated for 30 seconds to 10 minutes, and then adsorbing impurities in the water to be treated before floating to the surface.

6. The micro-nano stripping water supply method as described in claim 4, characterized in that, The water body to be treated, which has been treated with micro-nano bubbles and separated from the micro-nano bubbles, is then filtered. Specifically, the water body to be treated, which has been treated with micro-nano bubbles and separated from the micro-nano bubbles, is filtered through filter media, and the filter media is replaced or backwashed after 24-72 hours of continuous filtration.

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