A wastewater interfacial concentration system utilizing photothermal floats and its application method

Abstract

This invention provides a wastewater interface concentration system and its application method utilizing photothermal floats. The water distribution unit controls the flow rate and water level of the system via a booster pump. The photothermal evaporation concentration unit is formed by multiple interconnected long, narrow water channels. Segmented nets within the pool prevent the floats from flowing and rolling along the water flow, and from accumulating at the end of the channels. The water collection unit is connected to the water distribution unit and the concentration unit via pipes and pumps, forming an adjustable hydraulic circulation loop and control. The water flow rate is controlled by adjusting the pump flow rate, thereby controlling the rolling of the floats. This invention uses hydraulically driven photothermal foam balls to dynamically roll within the netted sections, performing solar interface evaporation treatment on high-salinity wastewater. Relying on an integrated design of dynamic anti-scaling, optimized flow field design, and modular maintenance, it achieves efficient and stable evaporation concentration of high-salinity wastewater, featuring low energy consumption, strong anti-scaling ability, simple operation and maintenance, and environmental friendliness.

Description

Technical Field

[0001] This invention belongs to the technical field of industrial wastewater treatment devices, and particularly relates to a wastewater interface concentration system and its usage method utilizing a photothermal float ball. Background Technology

[0002] High-salinity wastewater poses a significant challenge to industrial water treatment. This type of wastewater primarily originates from industrial processes such as coal chemical, pharmaceutical, printing and dyeing, thermal power generation, and seawater desalination. It contains high concentrations of inorganic salts such as chloride ions, sulfate ions, and sodium ions, as well as recalcitrant organic matter. Direct discharge will lead to serious environmental problems such as increased water mineralization and soil salinization. Existing treatment technologies have significant limitations: thermal processes such as mechanical vapor recompression (MVR) can achieve zero wastewater discharge, but require huge equipment investments, have high energy consumption, and are prone to severe inorganic salt scaling on the evaporator surface, necessitating frequent shutdowns for cleaning and incurring high maintenance costs. Membrane technologies such as reverse osmosis (RO) are limited by high osmotic pressure, with water recovery rates typically below 50%. Membrane modules are prone to fouling and clogging, producing more difficult-to-treat concentrates. While natural evaporation ponds and their upgraded technology, static interface solar evaporation, can significantly reduce energy consumption, the former requires a large area and has low evaporation efficiency, while the latter experiences rapid salt crystallization at the evaporation interface in high-salinity environments, clogging water transport channels and leading to a sharp decline in performance.

[0003] Therefore, there is a need in the field for a solar-powered high-salt wastewater treatment device and method of use that can effectively resist scaling and has high operational flexibility and ease of maintenance. Summary of the Invention

[0004] This invention provides a wastewater interface concentration system and its usage method using a photothermal float ball, aiming to solve the problems of easy scaling, single operation mode, and inconvenient maintenance in existing solar evaporation systems.

[0005] To address the aforementioned problems, the present invention provides a wastewater interface concentration system and its usage method utilizing a photothermal float.

[0006] A wastewater interface concentration system utilizing a photothermal float sphere includes:

[0007] A water distribution unit, wherein the water distribution unit is a main inlet tank for receiving and storing high-salinity wastewater to be treated;

[0008] The photothermal evaporation and concentration unit, connected to the water distribution unit, consists of several long strip water channels. Photothermal floats are laid on the water surface in the water channels. Several segmented nets are set along the water flow direction in the long strip water channels. The segmented nets divide the water surface into several independent float rolling areas. The photothermal floats can roll in a restricted manner with the water flow in the float rolling areas.

[0009] A water collection unit, which is a water collection pond, is located at the tail end of the photothermal evaporation and concentration unit, and a hydraulic circulation loop is constructed through a pipeline system and a water pump;

[0010] Among them, the pipeline system is equipped with a flow rate control device for adjusting the water flow rate flowing through the long strip-shaped water channel to switch the photothermal floating ball to a stable suspension evaporation state or a rolling cleaning state; a transverse maintenance gate and a maintenance sidewalk are arranged between adjacent parallel flow channels of the photothermal evaporation and concentration unit, which is convenient for the maintenance of a single water channel; an anti-seepage layer is laid in the water distribution unit, the long strip-shaped water channel and the water collection pond.

[0011] A method for using a wastewater interface concentration system using a photothermal floating ball includes the following steps:

[0012] Introduce high-salt wastewater into the photothermal evaporation and concentration unit, and use the photothermal floating ball for interface evaporation under sunlight irradiation; by controlling the water flow rate in the water channel V r to alternately execute the following two working modes:

[0013] Working mode one: Evaporation and concentration mode: Control the flow rate V r within the range of 0.05 - 0.20 m / min, and satisfy V r <d / t; where d is the diameter of the floating ball and t is the unit time; make the photothermal floating ball maintain stable suspension in the segmented barrier net area for interface evaporation;

[0014] Working mode two: Floating ball desalting mode: Periodically increase the flow rate, control the flow rate V r within the range of 0.5 - 2.0 m / min, and satisfy V r >10*d / t, drive the photothermal floating ball to quickly roll in the water, and use the water flow shear force and infiltration effect to dissolve the crystal salt on the surface of the floating ball.

[0015] The present invention provides a wastewater interface concentration system and a method for using a photothermal floating ball, including a water distribution unit for water inlet, a photothermal evaporation and concentration unit, and a water collection unit for water channel cleaning and maintenance; the water distribution unit controls the flow rate and water level of the system through a lift pump, the photothermal evaporation and concentration unit is connected in a meandering manner by multiple long strip-shaped water channels, and a segmented barrier net is provided in the pool to prevent the floating ball from flowing and rolling along the water flow and accumulating at the tail of the water channel; the water collection unit is connected to the water distribution unit and the concentration unit through pipelines and water pumps respectively, forming a controllable hydraulic circulation loop and control, and controlling the water flow rate by controlling the water pump flow rate, so as to control the rolling of the floating ball.

[0016] This invention utilizes hydraulically driven solar thermal foam balls to dynamically roll within a barrier zone, enabling solar-powered interfacial evaporation treatment of high-salinity wastewater. Through an integrated design incorporating dynamic anti-scaling, optimized flow field design, and modular maintenance, it achieves highly efficient and stable evaporation and concentration of high-salinity wastewater, featuring low energy consumption, strong anti-scaling capabilities, easy operation and maintenance, and environmental friendliness.

[0017] Compared with the prior art, the present invention has the following beneficial effects:

[0018] 1. This invention utilizes water flow to drive the photothermal floating ball to continuously roll, realizing a dynamic cycle of "evaporation-wetting-dissolving", fundamentally solving the problem of salt crystallization at the evaporation interface in a high-salt environment;

[0019] 2. This invention innovatively designs the water collection unit (water collection tank) as the hydraulic and maintenance hub of the system. Through its dual return path, it realizes precise control of the system's concentration process and flexible switching of operating modes, which significantly improves the system's adaptability and processing efficiency.

[0020] 3. This hub design plays a core role during maintenance, safely receiving and storing wastewater discharged from the first treatment unit, providing key assurance for modular maintenance and greatly improving the system's maintainability and online rate;

[0021] 4. This invention optimizes the flow field by setting up segmented barriers with a spacing of 2-5 m, thus ensuring evaporation efficiency and stability;

[0022] 5. The system structure of this invention is simple, mainly relying on solar energy and water power for operation, with low operating costs and no secondary pollution. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the planar layout and hydraulic flow of the system of the present invention.

[0024] Figure 2 This is a schematic diagram showing the operating and desalination status of the photothermal float.

[0025] Figure 3 for Figure 1 A cross-sectional view of the operation of the medium-length strip-shaped water channel and the collection pool.

[0026] Figure 4 for Figure 1 CC profile of the operation status of a single long strip water channel.

[0027] Figure 5 for Figure 1 CC profile of the desalination process in a single long strip of water channel.

[0028] Figure 6 for Figure 1AA cross-sectional view of the descaling (maintenance) process of the medium-length strip water channel and the water collection tank.

[0029] Figure 7 for Figure 1 BB cross-sectional view of the trapezoidal cross-section structure of the long strip water channel of the photothermal evaporation and concentration unit.

[0030] Figure 8 for Figure 1 A cross-sectional view of the semi-circular cross-section of the long strip-shaped water channel in the photothermal evaporation and concentration unit (BB).

[0031] Attached reference numerals: 1. Main intake pool; 2. Water pump; 3. Long strip water channel; 4. Segmented barrier net; 5. Photothermal float; 6. Collection pool; 7. Return channel; 8. Seepage-proof layer; 9. Lateral maintenance gate; 10. Maintenance walkway; 11. Longitudinal maintenance gate. Detailed Implementation

[0032] To make the present invention more apparent and understandable, preferred embodiments are described in detail below with reference to the accompanying drawings:

[0033] like Figure 1 As shown, a wastewater interface concentration system utilizing a photothermal floating sphere includes:

[0034] Water distribution unit, wherein the water distribution unit is a main inlet tank 1 for receiving and storing high-salinity wastewater to be treated;

[0035] The photothermal evaporation and concentration unit, connected to the water distribution unit, consists of several long strip water channels 3. Photothermal floats 5 are laid on the water surface in the water channels. Several segmented nets 4 are set along the water flow direction in the long strip water channels 3. The segmented nets 4 divide the water surface into several independent float rolling areas. The photothermal floats 5 can roll in a restricted manner with the water flow in the float rolling areas.

[0036] The water collection unit, which is a water collection tank 6, is located at the end of the photothermal evaporation and concentration unit. A hydraulic circulation loop is constructed through a pipeline system including a return channel 7 and a water pump 2.

[0037] The pipeline system is equipped with a flow rate control device to adjust the water flow speed through the elongated water channel 3, so as to switch the photothermal float 5 to a stable suspended evaporation state or a rolling cleaning state; a transverse inspection gate 9 and an inspection walkway 10 are provided between adjacent parallel channels of the photothermal evaporation and concentration unit to facilitate the inspection and maintenance of individual water channels; a longitudinal inspection gate 11 is provided on the side of the elongated water channel 3 near the water collection tank 6; and an impermeable layer 8 is laid in the water distribution unit, the elongated water channel 3 and the water collection tank 6.

[0038] like Figure 1As shown, the photothermal evaporation and concentration unit of the present invention is composed of multiple long strip water channels 3 connected in a U-shape, with the length of a single water channel being 5-100 m; the spacing between the segmented barrier nets 4 is 2-5 m, which is used to prevent the accumulation of floats and optimize the flow field. Figure 3 for Figure 1 The AA cross-sectional view shows the operation of the long strip water channel and the collection pool. Figure 4 for Figure 1 The CC cross-sectional view shows the operational status of a single long strip of water channel. Figure 5 for Figure 1 The CC cross-section diagram shows the desalination process of a single long strip of water channel. Figure 6 for Figure 1 The AA cross-sectional diagram shows the status of the descaling (maintenance) process of the long strip water channel and the water collection tank.

[0039] like Figure 7 , Figure 8 As shown, the cross-section of the elongated water channel 3 of the present invention is trapezoidal or semi-circular; wherein the depth of the trapezoidal cross-section is 0.4-0.8 m, the width of the lower base is 0.8-1.5 m, the width of the upper base is 2.0-3.5 m, and the slope ratio is 1:1.5; the radius of the semi-circular cross-section is 0.5-1.2 m.

[0040] like Figure 1 , Figures 3-8 As shown, the photothermal floating ball 5 of the present invention is made by curing porous hydrophilic melamine foam balls loaded with carbon black and polyvinyl alcohol composite slurry; its diameter is 5-20 cm.

[0041] The water collection tank 6 of the water collection unit of the present invention realizes a dual return path through pipeline switching: path one returns the concentrate to the water distribution unit for mixing; path two pumps the concentrate directly to the water inlet of the photothermal evaporation concentration unit for rapid circulation; and the volume of the water collection tank 6 is configured to be greater than or equal to the volume of a single long strip water channel 3, for emptying the water storage tank during maintenance.

[0042] like Figure 2 As shown, a method for using a wastewater interface concentration system utilizing a photothermal float ball includes the following steps:

[0043] High-salinity wastewater is introduced into a photothermal evaporation and concentration unit, where interfacial evaporation is carried out using photothermal floats 5 under sunlight irradiation; the flow rate of the water in the channel is controlled. V r To alternate between the following two working modes:

[0044] Operating Mode 1: Evaporation and Concentration Mode (Operating Status): Control Flow Rate V r Within the range of 0.05-0.20 m / min, and satisfyingV r <d / t; where d is the diameter of the floating ball and t is the unit time; to keep the photothermal floating ball 5 stably suspended in the segmented netting 4 area for interfacial evaporation;

[0045] Operating mode two: floating ball desalination mode (desalination state): periodically increase the flow rate and control the flow rate V r within the range of 0.5 - 2.0 m / min and satisfy V r > 10*d / t, driving the photothermal floating ball 5 to tumble rapidly in water, and using the water flow shear force and wetting effect to dissolve the crystalline salt on the surface of the floating ball.

[0046] Preferably, the execution frequency of the floating ball desalination mode is once every 4 - 8 hours of operation, and the duration of each time is 10 - 30 minutes.

[0047] Preferably, when sludge deposits at the bottom of the water channel, open the sewage gate at the bottom of the water channel, drain the bottom wastewater into the water collection unit, and use the water collection unit as a sedimentation and temporary storage container for cleaning. This process is the same as the maintenance process.

[0048] Application example 1: This example is carried out in the northwest region (a certain industrial park). The average annual sunshine hours in this region exceed 2,800 hours, and the average annual solar radiation reaches 5,500 - 6,600 MJ / m². The treatment object is the high - salt wastewater generated by textile and printing and dyeing enterprises in this industrial park. The total dissolved solids (TDS) in the influent is 18,000 - 25,000 mg / L, the chemical oxygen demand (COD) is 280 - 350 mg / L, and the main salt components are sodium sulfate and sodium chloride. The system configuration is as follows: The photothermal evaporation and concentration unit uses a trapezoidal cross - section long - strip water channel 3, the length of a single water channel is 50 m, the cross - section size is a depth of 0.7 m, a bottom width of 1.0 m, a top width of 2.8 m, and the slope ratio of the side slope is 1:1.5; the spacing of the segmented netting 4 is set to 3 m; the diameter of the photothermal floating ball 5 is 12 cm, and the water surface coverage rate reaches 96%; the operating flow rate ( V r ) is controlled at 0.08 m / min, and floating ball desalination is carried out once every 6 hours of operation. The desalination flow rate is increased to 1.2 m / min and lasts for 20 minutes.

[0049] Operational Results: Under this configuration, the daily evaporation rate per unit projected area reached 7.3 L / m². After 30 days of continuous operation, the effluent TDS was successfully concentrated from 22,000 mg / L to 88,000 mg / L, and the COD increased from 320 mg / L to 410 mg / L. The combination of the trapezoidal water channel and the 3-meter mesh spacing ensured that the floats were evenly distributed and rolled even in wastewater containing dyes and auxiliaries. Throughout the entire operation cycle, neither the surface of the floats nor the water channel became clogged due to sodium sulfate crystallization, demonstrating the system's effective concentration and excellent anti-scaling ability for high-salt textile dyeing wastewater.

[0050] Application Example 2: This example was also implemented in Northwest China (an industrial park), utilizing the region's abundant solar energy resources. The treated wastewater was high-salt wastewater from textile printing and dyeing enterprises within the industrial park, with an influent TDS of 15000-20000 mg / L and COD of 200-300 mg / L. The aim was to achieve long-term stable operation and low maintenance for systems with low salt concentrations but large volumes. The system configuration was as follows: the solar thermal evaporation and concentration unit used a semi-circular cross-section elongated water channel 3, with a single channel length of 80 m and a cross-sectional radius of 1.0 m; the segmented barrier net 4 was spaced 5 m apart to balance flow field control and structural simplicity; the solar thermal floating ball 5 had a diameter of 8 cm and a water surface coverage of 98%; the operating flow rate (… V r The flow rate is controlled at 0.15 m / min. Float desalination is performed every 8 hours, with the desalination flow rate increased to 1.5 m / min and lasting for 15 minutes.

[0051] Operational Results: Under this configuration, the daily evaporation rate per unit projected area of ​​the system remained stable at 6.9 L / m². The semi-circular cross-section exhibited excellent hydraulic characteristics, and combined with the wide spacing of the screens, effectively addressed the impact of fine suspended solids in textile wastewater, achieving orderly flow of the float group. After 30 days of continuous operation, the effluent TDS increased from 18,000 mg / L to 78,000 mg / L, and COD increased from 280 mg / L to 350 mg / L. The system demonstrated extremely high operational stability throughout the testing period. The dynamic desalination mechanism designed specifically for the characteristics of dyeing and printing wastewater was highly effective, with extremely low maintenance requirements, making it particularly suitable for treating large-scale, continuously discharged textile dyeing and printing wastewater.

[0052] To verify the effect of flow rate on evaporation rate and salt formation, the following table lists Experimental Example 1 and Comparative Examples 1-3 for illustration: A trapezoidal water channel with a length of 10 meters and a width of 1 meter was used, with a water depth of 0.5 meters; the diameter of the photothermal float was 10 cm, and the water surface coverage was 95%; the treatment solution was a 15 wt% NaCl solution.

[0053]

[0054] In Comparative Example 1, under static conditions, salt cannot diffuse, leading to blockage of the evaporation channel and rapid efficiency degradation.

[0055] In Experiment 1, the flow rate was moderate, which both renewed the interfacial water layer and did not remove too much heat, resulting in the highest evaporation rate.

[0056] In Comparative Example 2, although no salt was formed, the excessively fast water flow carried away surface heat (large heat convection loss), resulting in a decrease in the evaporation rate.

[0057] Comparative Example 3 shows that the intense tumbling and disturbance caused severe heat loss, making it unsuitable for long-term use as an evaporation mode and only suitable for short-term cleaning.

[0058] Experimental results show that when the flow rate is controlled between 0.05 and 0.20 m / min, the system is at the equilibrium point between heat utilization and salt diffusion. Below this range, salt deposition is severe, and above this range, heat loss increases. Therefore, this invention employs low-speed evaporation and short-time high-speed cleaning. V r The strategy of combining speeds of 0.5-2.0 m / min is key to maintaining long-term high-efficiency operation.

[0059] To verify the influence of the spacing between the segmented barriers on the flow field and the distribution of the floats, the following table lists Experimental Example 2 and Comparative Example AC for illustration: a long strip of water channel with a total length of 50 meters, a solar thermal float diameter of 8 cm, and a flow velocity of 0.1 m / min.

[0060]

[0061] Experimental data shows that when there is no barrier net or the spacing is too large, the shear force of the water flow causes lightweight foam balls to accumulate at the end of the channel, forming multiple overlapping layers. The bottom layer of floats cannot receive sunlight, resulting in a significant decrease in the effective evaporation area of ​​the system. However, when the spacing is set at 2-5 m, it can ensure that the floats are laid in a single layer while avoiding the cost and shading of overly dense barrier net facilities.

[0062] To verify the lifespan advantage of the "dynamic circulation cleaning" process compared to traditional technologies, a simulated real-world industrial scenario was used to compare its anti-fouling performance under long-term operation.

[0063] The system operated continuously for 15 days, using RO concentrate from dyeing and printing (TDS 30000 mg / L, COD 300 mg / L). The control group used traditional fixed photothermal materials (without hydraulic drive), while the experimental group used the process of this invention (performing 20 minutes of high-speed cleaning every 6 hours). V r =1.5 m / min).

[0064] The results showed that on day 1, the evaporation rates of the two groups were comparable; on day 3, a visible white salt crust began to appear on the surface of the control group, and the evaporation rate dropped to 70% of the initial value; on day 7, the evaporation rate of the control group dropped to 40% of the initial value, and COD caused the surface to turn black and sticky; the experimental group, through regular rolling and friction, kept the surface of the float moist and porous, and the evaporation rate remained stable at more than 95% of the initial value; on day 15, the photothermal material of the control group was completely blocked and required manual cleaning, while the experimental group still maintained an evaporation rate of more than 92% of the initial value.

[0065] Through a 15-day long-term continuous operation test, the system employing the "evaporation-cleaning" alternating process of this invention achieved an average daily evaporation rate more than 120% higher than that of the traditional static system. The high-speed water flow not only dissolved inorganic salts but also removed some organic fouling substances through physical collisions between the spheres, demonstrating the unique advantages of this process in treating high-salt, high-COD wastewater.

[0066] To verify the matching relationship between the diameter of the photothermal float and its self-reversing capability, the following table lists the reversing behavior of photothermal floats with different diameters: Cleaning Mode Flow Rate V r =1.0 m / min.

[0067]

[0068] Experiments revealed a specific matching relationship between the diameter of the float and the shear torque of the water flow. When the diameter is less than 5 cm, the float is prone to clumping together due to surface tension and does not roll; when the diameter is greater than 20 cm, the moment of inertia is too large, and the normal flow velocity cannot drive it to roll effectively. Within the range of 5-20 cm, the photothermal sphere can achieve the optimal "translation-rotation" coupled motion.

[0069] The experimental data above fully demonstrate the synergistic effect between flow rate control and structural size design in this invention. This synergy produces unexpected technical effects (i.e., long-term anti-fouling ability).

[0070] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any form or substance. It should be noted that those skilled in the art can make various improvements and additions without departing from the present invention, and these improvements and additions should also be considered within the scope of protection of the present invention. Any modifications, alterations, and equivalent changes made by those skilled in the art based on the above-disclosed technical content without departing from the spirit and scope of the present invention are equivalent embodiments of the present invention. Furthermore, any modifications, alterations, and evolutions made to the above embodiments based on the essential technology of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A wastewater interface concentration system utilizing a photothermal floating sphere, characterized in that, include: Water distribution unit, wherein the water distribution unit is a main inlet tank (1) for receiving and storing high-salinity wastewater to be treated. The photothermal evaporation and concentration unit is connected to the water distribution unit and consists of several long strip water channels (3). The water surface in the water channel is covered with photothermal floats (5). The long strip water channel (3) is provided with several segmented nets (4) along the water flow direction. The segmented nets (4) divide the water surface into several independent float rolling areas. The photothermal floats (5) can roll in a restricted manner with the water flow in the float rolling area. The water collection unit is a water collection tank (6), located at the tail end of the photothermal evaporation and concentration unit, and a hydraulic circulation loop is constructed through a pipeline system and a water pump (2); The pipeline system is equipped with a flow rate control device to adjust the flow rate of water flowing through the elongated water channel (3) so as to switch the photothermal float (5) to a stable suspended evaporation state or a rolling cleaning state; a transverse maintenance gate (9) and a maintenance walkway (10) are provided between adjacent parallel channels of the photothermal evaporation concentration unit to facilitate the maintenance of individual water channels; an impermeable layer (8) is laid in the water distribution unit, the elongated water channel (3) and the collection pool (6). The photothermal evaporation and concentration unit is composed of multiple long strip water channels (3) connected in a U-shape, with the length of a single water channel being 5-100 m; the spacing between the segmented barrier nets (4) is 2-5 m, which is used to prevent the accumulation of floats and optimize the flow field; The photothermal float (5) is made by curing porous hydrophilic melamine foam balls loaded with carbon black and polyvinyl alcohol composite slurry; its diameter is 5-20 cm.

2. The wastewater interface concentration system utilizing a photothermal floating ball according to claim 1, characterized in that, The cross-section of the elongated water channel (3) is trapezoidal or semi-circular; wherein the depth of the trapezoidal cross-section is 0.4-0.8 m, the width of the lower base is 0.8-1.5 m, the width of the upper base is 2.0-3.5 m, and the slope ratio is 1:1.5; the radius of the semi-circular cross-section is 0.5-1.2 m.

3. The wastewater interface concentration system utilizing a photothermal floating sphere as described in claim 1, characterized in that, The water collection tank (6) of the water collection unit realizes a dual return path through pipeline switching: Path 1 returns the concentrate to the water distribution unit for mixing; Path 2 directly pumps the concentrate to the inlet of the photothermal evaporation concentration unit for rapid circulation; and the volume of the water collection tank (6) is configured to be greater than or equal to the volume of a single long strip water channel (3) for emptying the water storage tank during maintenance.

4. A method of using a wastewater interface concentration system based on any one of claims 1 to 3, characterized in that, Includes the following steps: High-salinity wastewater is introduced into a photothermal evaporation and concentration unit, where interfacial evaporation is carried out using a photothermal floating ball (5) under sunlight irradiation; the flow rate of the water in the channel is controlled. V r To alternate between the following two working modes: Working mode 1: Evaporation concentration mode: Control the flow rate V r within the range of 0.05 - 0.20 m / min and satisfy V r <d / t; where d is the diameter of the floating ball and t is the unit time; make the photothermal floating ball (5) maintain stable suspension within the segmented barrier net (4) area for interfacial evaporation; Operating Mode 2: Float-based desalination mode: Periodically increase flow rate and control flow rate. V r Within the range of 0.5-2.0 m / min, and satisfying V r >10*d / t, drive the photothermal float (5) to roll rapidly in the water, and use the shear force and wetting effect of the water flow to dissolve the crystalline salt on the surface of the float.

5. The method of use according to claim 4, characterized in that, The float desalination mode is executed once every 4-8 hours of operation, with each execution lasting 10-30 minutes.

6. The method of use according to claim 4, characterized in that, When sludge accumulates at the bottom of the canal, open the sewage gate at the bottom of the canal to discharge the wastewater into the water collection unit. The water collection unit is then used as a sedimentation and temporary storage container for cleaning. This process is consistent with the maintenance procedure.

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