Integrated device for sewage treatment and sewage treatment system

Abstract

The application discloses a sewage treatment integrated device and a sewage treatment system, and belongs to the technical field of domestic sewage treatment. The device comprises a water distribution pool, a water distributor, a filter assembly, an intermediate pool and a reprocessing assembly. The water distributor is arranged in the water distribution pool, and the inlet of the water distributor is communicated with the water distribution pool. The filter assembly comprises a filter barrel and a filter structure arranged in the filter barrel. The filter barrel is located below the water distributor, and the inlet of the filter barrel is communicated with the outlet of the water distributor. The intermediate pool is located below the filter barrel, and the outlet of the filter barrel is communicated with the intermediate pool. The reprocessing assembly is arranged in the intermediate pool, and comprises a sterilization device and a deodorization device. The water distributor is used for distributing sewage to the filter assembly, and the filtered sewage is sent to the intermediate pool for reprocessing. The sewage flows from top to bottom, and can be flexibly applied to rural areas of different scales and conditions, realizes on-site collection, treatment and resource utilization of the sewage, improves the rural living environment, and promotes the sustainable development of rural areas.

Description

Technical Field

[0001] This invention relates to the field of domestic sewage treatment technology, and in particular to an integrated sewage treatment device and sewage treatment system. Background Technology

[0002] With the rapid growth of the global population, the human living environment faces unprecedented challenges, a trend particularly pronounced in both urban and rural areas. Environmental pollution in rural areas is becoming increasingly prominent, posing a significant obstacle to sustainable rural development. The main causes of the deterioration of the rural living environment include, but are not limited to: indiscriminate discharge of untreated sewage, disorderly dumping of garbage, and burning of crop straw. Among these, the disorderly discharge of sewage is particularly serious and has become a key factor affecting the quality of the rural living environment.

[0003] Specifically, the problem of sewage discharge in rural areas is complex and diverse. Some livestock wastewater is discharged directly into surrounding water bodies, such as ditches and rivers, without any treatment, leading to a sharp decline in water quality and severe damage to the ecosystem. This phenomenon not only threatens the drinking water safety of rural residents but also affects the quality of agricultural irrigation water, further exacerbating the deterioration of the rural ecological environment.

[0004] To address the aforementioned issues, strengthening the effective collection, treatment, and resource utilization of rural domestic sewage has become an urgent priority for improving the rural living environment. However, the application of current rural domestic sewage treatment technologies faces numerous challenges. On the one hand, due to regional environmental differences and the level of rural economic development, the choice of sewage treatment technologies varies significantly across different regions. Although biological and ecological combined treatment technologies such as constructed wetlands, biological ponds, biogas purification ponds, and biofilters are relatively mature and can effectively degrade pollutants and remove nutrients such as nitrogen and phosphorus from sewage, the implementation of these technologies often relies on pipe network collection systems, resulting in high construction costs, the need for centralized treatment sites, frequent operation and maintenance, and high management costs, placing high demands on rural economic and technical capabilities.

[0005] On the other hand, the dispersed nature of rural residences, complex terrain, and lack of a comprehensive sewage collection network make sewage collection a major challenge. Furthermore, some farmers engage in small-scale livestock and poultry farming, generating wastewater that lacks effective disposal methods, further increasing the difficulty of rural sewage treatment.

[0006] Therefore, developing a technology suitable for decentralized wastewater treatment in rural areas that can effectively reduce costs and adapt to the complex environmental conditions in rural areas has become an urgent technical challenge. Summary of the Invention

[0007] The purpose of this invention is to provide an integrated sewage treatment device and system to solve the problems existing in the prior art. The device uses a distributor in a distribution tank to distribute sewage to a filter assembly for filtration. The treated sewage then enters an intermediate tank for further treatment, forming an integrated sewage treatment device that flows from top to bottom. This device can be flexibly applied to rural areas of different sizes and conditions, enabling on-site collection, treatment, and resource utilization of sewage, thereby effectively improving the rural living environment and promoting sustainable development in rural areas.

[0008] To achieve the above objectives, the present invention provides the following solution:

[0009] This invention provides an integrated wastewater treatment device, comprising a water distribution tank, a water distributor, a filtration assembly, an intermediate tank, and a retreatment assembly. The water distributor is disposed within the water distribution tank, and its inlet is connected to the water distribution tank. The filtration assembly includes a filter barrel and a filtration structure disposed within the filter barrel, with the filter barrel located below the water distributor and its inlet connected to the outlet of the water distributor. The intermediate tank is located below the filter barrel, and the outlet of the filter barrel is connected to the intermediate tank. The retreatment assembly is disposed within the intermediate tank and includes a sterilization device and a deodorization device.

[0010] In one embodiment, the water distributor includes a water distribution tank and a first water-passing medium disposed at the bottom of the water distribution tank. The water distribution tank has a first through hole on its side wall above the first water-passing medium, and a second through hole is provided at the bottom of the water distribution tank. The first through hole serves as the inlet of the water distributor, and the second through hole serves as the outlet of the water distributor. The first water-passing medium is made of a sponge-like material.

[0011] In one embodiment, the filtration structure includes a water-passing grid, filter media, and a second water-passing medium arranged sequentially from top to bottom inside the filter barrel. A third through hole is provided at the top of the filter barrel, and a fourth through hole is provided at the bottom of the filter barrel. The third through hole serves as the inlet of the filter barrel, and the fourth through hole serves as the outlet of the filter barrel. The second water-passing medium is made of a sponge-like material.

[0012] In one embodiment, a monitoring probe is also included, which is disposed in the intermediate pool.

[0013] In one embodiment, a reflux valve and a discharge valve are also included, and the monitoring results of the monitoring probe are used to open or close the reflux valve or the discharge valve in a coordinated manner.

[0014] In one embodiment, the system further includes a frame, load-bearing columns, and load-bearing plates. The top and bottom ends of the load-bearing columns are fixedly connected to the frame, and the load-bearing plates are spaced apart on the load-bearing columns. The water distribution tank and the filter assembly are located on different load-bearing plates, respectively.

[0015] In one embodiment, a control system is also included, which is electrically connected to the monitoring probe, the reflux valve and the discharge valve respectively. The frame is covered with a housing, and the control system is mounted on the housing.

[0016] In one embodiment, the sterilization device employs an ultraviolet lamp; and / or, the deodorization device employs an exhaust fan and an adsorption device.

[0017] In one embodiment, the adsorption device employs a biochar curtain, which is located between the water distribution tank and the intermediate tank.

[0018] The present invention also provides a wastewater treatment system, comprising at least two integrated wastewater treatment devices as described above, arranged in parallel.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] This invention arranges the water distribution tank, filter components, and intermediate tank sequentially from top to bottom. The water distributor in the water distribution tank can distribute sewage to the filter components for filtration. The treated sewage then enters the intermediate tank for further treatment such as sterilization and deodorization, forming an integrated sewage treatment device that flows from top to bottom. This device can be flexibly applied to rural areas of different sizes and conditions, enabling on-site collection, treatment, and resource utilization of sewage, thereby effectively improving the rural living environment and promoting sustainable development in rural areas. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the external appearance of the integrated wastewater treatment device in an embodiment of the present invention;

[0023] Figure 2 This is a front sectional view of the integrated wastewater treatment device in an embodiment of the present invention;

[0024] Figure 3 This is an internal schematic diagram of the integrated wastewater treatment device in an embodiment of the present invention;

[0025] Figure 4 This is a side view of the integrated wastewater treatment device in an embodiment of the present invention;

[0026] Figure 5This is a schematic diagram of the load-bearing plate in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the filter bucket in an embodiment of the present invention;

[0028] Figure 7 This is a schematic diagram of the water-passing grid in an embodiment of the present invention;

[0029] Figure 8 This is a schematic diagram of sponge-like materials in an embodiment of the present invention;

[0030] Figure 9 This is a schematic diagram of the internal structure of the water distribution tank in an embodiment of the present invention;

[0031] Figure 10 This is a schematic diagram of the water distributor in an embodiment of the present invention;

[0032] The components include: 1. Frame; 2. Door; 3. Load-bearing column; 4. Water distribution tank; 5. Intermediate tank; 6. Base; 7. Sewage pump; 8. Pipeline; 9. Control system; 10. Water distributor; 11. Filter assembly; 12. Sponge material; 13. Load-bearing plate; 14. Exhaust fan; 15. Biochar curtain; 16. Ultraviolet lamp; 17. Monitoring probe; 19. Visual window; 20. Backflow valve; 21. Discharge valve; 22. Drain pipe; 23. Locking handle; 24. Filter bucket; 25. Filter media; 26. Water-passing grid; 27. Slot; 28. Water distribution tank; 29. ​​First through hole. Detailed Implementation

[0033] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0034] The purpose of this invention is to provide an integrated sewage treatment device and system to solve the problems existing in the prior art. It utilizes a water distributor in a distribution tank to distribute sewage to a filter assembly for filtration. The treated sewage then enters an intermediate tank for further treatment, forming an integrated sewage treatment device that flows from top to bottom. This device can be flexibly applied to rural areas of different sizes and conditions, enabling on-site collection, treatment, and resource utilization of sewage, thereby effectively improving the rural living environment and promoting the sustainable development of rural areas.

[0035] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] like Figures 1-10As shown, this invention provides an integrated wastewater treatment device, including a distribution tank 4, a distributor 10, a filter assembly 11, an intermediate tank 5, and a retreatment assembly. The distributor 10 is disposed within the distribution tank 4, and multiple distributors 10 can be installed within the distribution tank 4. The inlet of each distributor 10 is connected to the distribution tank 4. When wastewater enters the distributor 10, it distributes the wastewater to the filter assembly 11 connected to it, where the filter assembly 11 filters the wastewater. The filter assembly 11 includes a filter barrel 24 and a filter structure disposed within it. The filter barrel 24 is located below the distributor 10, and its inlet is connected to the outlet of the distributor 10. Wastewater entering the distributor 10 passes through the distributor 10 and then enters the filter barrel 24. After being filtered by the filter structure in the filter barrel 24, the wastewater is discharged from the filter barrel 24 and can either enter the next layer of filter assembly 11 for further filtration or directly enter the intermediate tank 5. The intermediate tank 5 is located below the last layer of filter tank 24. The outlet of filter tank 24 is connected to the intermediate tank 5. After being filtered by one or more stages of filter components 11, the wastewater enters the intermediate tank 5 through filter tank 24. The intermediate tank 5 collects and temporarily stores the filtered wastewater. The retreatment component is located in the intermediate tank 5 and includes a sterilization device and a deodorization device to sterilize and deodorize the wastewater in the intermediate tank 5. The treated wastewater that meets the standards is discharged from the intermediate tank 5 for recycling and reuse.

[0037] This invention arranges the water distribution tank 4, the filter assembly 11, and the intermediate tank 5 sequentially from top to bottom. The water distributor 10 in the water distribution tank 4 can distribute the sewage to the filter assembly 11 for filtration. The treated sewage then enters the intermediate tank 5 for further treatment such as sterilization and deodorization, forming an integrated sewage treatment device that flows from top to bottom. This device can be flexibly applied to rural areas of different sizes and conditions, enabling on-site collection, treatment, and resource utilization of sewage, thereby effectively improving the rural living environment and promoting the sustainable development of rural areas.

[0038] In one implementation, such as Figure 9 and Figure 10As shown, the water distributor 10 includes a water distribution tank 28 and a first water-passing medium disposed at the bottom of the water distribution tank 28. A first through-hole 29 is provided on the side wall of the water distribution tank 28 above the first water-passing medium. Multiple first through-holes 29 can be evenly distributed on the water distribution tank 28. When the sewage level in the water distribution pool 4 reaches the height of the first through-hole 29, the sewage can enter the water distribution tank 28 through the first through-hole 29. At this time, the water distribution pool 4 below the height of the first through-hole 29 can serve as a sedimentation zone for sewage. Heavier and larger impurities in the sewage can settle and be temporarily stored in the sedimentation zone. The surface sewage slowly enters the water distribution tank 28 through the first through-hole 29 for sewage distribution. Simultaneously, the first through-hole 29 also acts as a filter, intercepting larger impurities to achieve efficient filtration. Furthermore, the water distribution pool 4 and the water distributor 10 can be detachable for easy cleaning of sedimented or filtered impurities in the water distribution pool 4. The bottom of the water distribution tank 28 has a second through hole. The first through hole 29 serves as the inlet of the water distributor 10, and the second through hole serves as the outlet of the water distributor 10. The first water-passing medium is a sponge-like material 12. The sponge-like material 12 can slow down the water flow, allowing the sewage to slowly and continuously enter the filter assembly 11 for filtration, thereby improving the uniform water distribution effect. The sewage enters the water distribution tank 28 through the first through hole 29, and after being saturated by the sponge-like material 12, it drips down and flows out through the second through hole.

[0039] In one implementation, such as Figures 6-8 As shown, the filtration structure includes a water-passing grid 26, filter media 25, and a second water-passing medium arranged sequentially from top to bottom within the filter barrel 24. The water-passing grid 26 serves to further intercept impurities and distribute the water flow. The filter media 25 performs the filtering function and can be made of porous materials such as flamed rock, ceramsite, or activated carbon. The second water-passing medium is made of sponge-like material 12, which slows down the water flow and, combined with its internal pores, further improves the filtration effect. A third through-hole is opened at the top of the filter barrel 24, and a fourth through-hole is opened at the bottom. The third through-hole serves as the inlet of the filter barrel 24, and the fourth through-hole serves as the outlet of the filter barrel 24. After the wastewater flows out from the second through-hole of the water distributor 10, it enters the filter barrel 24 through the third through-hole, passes sequentially through the water-passing grid 26, filter media 25, and sponge-like material 12 until it is saturated with water, then drips and flows out through the fourth through-hole into the intermediate tank 5.

[0040] In one implementation, such as Figure 2 As shown, it also includes a monitoring probe 17, which is installed in the intermediate tank 5. The monitoring probe 17 can monitor the pH, turbidity, conductivity, nitrogen, phosphorus and other properties of the wastewater in the intermediate tank 5 to determine whether the wastewater meets the standards.

[0041] In one implementation, such as Figure 4As shown, it also includes a return valve 20 and a discharge valve 21. Both the return valve 20 and the discharge valve 21 can be solenoid valves to automatically control their opening and closing. The monitoring results of the monitoring probe 17 are used to link the opening and closing of the return valve 20 or the discharge valve 21. When the sewage in the intermediate tank 5 meets the standards, it enters the drain pipe 22 through the discharge valve 21. If the sewage in the intermediate tank 5 does not meet the requirements, it is returned to the distribution tank 4 or the sewage tank for further treatment through the return valve 20. Both the discharged sewage and the returned sewage flow under the action of a pump.

[0042] In one implementation, such as Figures 1-3 As shown, the system also includes a frame 1, load-bearing columns 3, and load-bearing plates 13. The top and bottom of the load-bearing columns 3 are fixedly connected to the frame 1. The frame 1 is mounted on a base 6, which has legs that can lift the frame 1 to a certain height, facilitating installation on uneven ground and improving the stability of the device. The load-bearing plates 13 are spaced apart on the load-bearing columns 3, and are supported by the frame 1 and the load-bearing columns 3. The water distribution tank 4 and the filter assembly 11 are located on different load-bearing plates 13 and can be disassembled and installed as needed.

[0043] In one implementation, such as Figure 5 As shown, the load-bearing plate 13 is provided with a slot 27, and the water distribution bucket 28 of the water distributor 10 and the filter bucket 24 of the filter assembly 11 can be installed in the slot 27 for fixation. The water distribution bucket 28 can be connected to the lower filter bucket 24, and the filter bucket 24 can be connected to the lower filter bucket 24 or directly connected to the intermediate pool 5.

[0044] In one embodiment, the main components such as the frame 1 and the filter assembly 11 are made of corrosion-resistant, sun-resistant, and frost-resistant materials (such as stainless steel or PVC), while the load-bearing column 3 and the load-bearing plate 13 are made of stainless steel. Power can be supplied by household electricity or solar energy.

[0045] In one implementation, such as Figures 1-4 As shown, it also includes a control system 9, which is electrically connected to the monitoring probe 17, the return valve 20, and the discharge valve 21. Data monitored by the monitoring probe 17 can be transmitted to the control system 9, which can send control signals to the return valve 20 and the discharge valve 21 to achieve wastewater discharge and return according to the wastewater treatment situation. A housing is provided over the frame 1, enclosing it. A door 2 is provided on the housing, and the door 2 is equipped with a lockable handle 23 for easy opening and closing and locking after closing. The door 2 facilitates the installation, replacement, or maintenance of components such as the filter assembly 11. The control system 9 is mounted on the housing and can be located on the side of the housing; opening and closing the door 2 does not affect the operation of the control system 9.

[0046] In one embodiment, the sterilization device employs an ultraviolet lamp 16, which can be installed on the side wall of the intermediate pool 5, either submerged in the water or located above the water surface.

[0047] In one embodiment, the deodorization device employs an exhaust fan 14 and an adsorption device. The exhaust fan 14 can be installed at the bottom of the support plate 13 above the intermediate pool 5. The housing is provided with ventilation holes. The adsorption device can be placed in the path of the airflow to the ventilation holes. The exhaust fan 14 blows the airflow to the adsorption device, and the adsorption device adsorbs the odor. The adsorbed gas is discharged outside the housing to perform deodorization.

[0048] In one embodiment, the adsorption device employs a biochar curtain 15, which is located between the water distribution tank 4 and the intermediate tank 5, hanging down in a curtain shape. The biochar curtain 15 can eliminate the odor of sewage inside the device. The exhaust fan 14 can first blow airflow toward the biochar curtain 15, and after being deodorized by the biochar curtain 15, it flows to the outside of the shell.

[0049] The integrated sewage treatment device of this invention is characterized by its small size, small footprint, and modular installation. It is suitable for domestic sewage treatment in scattered rural households and can also treat sewage from a small number of livestock such as pigs, cattle, and sheep raised by farmers. The device has low energy consumption and can be powered by various energy sources such as household electricity and solar energy. Moreover, the filter component 11 is assembled, which is convenient for replacement and maintenance.

[0050] like Figures 1-10 As shown, the present invention also provides a wastewater treatment system, including at least two integrated wastewater treatment devices arranged in parallel as described above, and a wastewater pump 7 and a pipeline 8. The wastewater pump 7 draws wastewater through the pipeline 8 and flows it into a distribution tank 4 at the top of the integrated wastewater treatment device. The inlets of multiple integrated wastewater treatment devices can be connected in parallel to the same wastewater pump 7. In this case, the pipeline 8 can be provided with multiple branches connecting the integrated wastewater treatment devices. In addition, the outlets of multiple integrated wastewater treatment devices can all flow into the same discharge network.

[0051] The integrated sewage treatment device of this invention can be used in combination with two or more sets to meet the needs of large families or several households. It solves the problems of traditional centralized sewage treatment, such as difficulty in laying pipelines, difficulty in sewage collection, high investment, large space occupation, frequent maintenance, high management costs, and the need for professional technicians.

[0052] Working principle of the integrated wastewater treatment device of this invention:

[0053] The integrated sewage treatment device is installed next to the farmer's three-compartment septic tank (sewage tank). Sewage from the three-compartment septic tank is pumped into the distribution tank 4 by the sewage pump 7. When the water level in the distribution tank 4 rises to the first through hole 29 (distribution hole) above the distributor 10, the sewage falls into the first water-passing medium in the distributor 10 through the first through hole 29. After the first water-passing medium is saturated with water, the sewage drips into the filter bucket 24 of the filter assembly 11 below. After being filtered by the filter media 25, it falls into the second water-passing medium and then enters the next filter assembly 11 until it enters the lowest intermediate tank 5. In the intermediate tank 5, harmful bacteria in the sewage are killed by ultraviolet irradiation. The monitoring probe 17 of the intermediate tank 5 tests the indicators of the sewage entering it. The test results can be viewed on-site in the visualization window 19 or remotely through the data platform. If the discharge standard is met, the discharge valve 21 is activated, and the sewage is discharged into the discharge network through the drain pipe 22. If the discharge standard is not met, the sewage is returned to the distribution tank 4 or the three-compartment septic tank through the return valve 20 for a second treatment until it meets the discharge standard. During the wastewater treatment process, exhaust fan 14 increases air circulation, and biochar curtain 15 eliminates wastewater odor. The frame 1 can be customized to suit the needs of new rural construction and beautiful village development. Two or three devices can also be connected in parallel to treat wastewater from multiple households, depending on the volume of wastewater.

[0054] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. An integrated wastewater treatment device, characterized in that, include: Water distribution pool; A water distributor is installed inside the water distribution tank, and the inlet of the water distributor is connected to the water distribution tank; A filtration assembly, comprising a filter barrel and a filtration structure disposed within the filter barrel, wherein the filter barrel is located below the water distributor and the inlet of the filter barrel is connected to the outlet of the water distributor; An intermediate pool is located below the filter barrel, and the outlet of the filter barrel is connected to the intermediate pool; And a reprocessing component, which is disposed in the intermediate tank, the reprocessing component including a sterilization device and a deodorization device; The water distributor includes a water distribution tank and a first water-passing medium disposed at the bottom of the water distribution tank. A first through hole is provided on the side wall of the water distribution tank above the first water-passing medium, and a second through hole is provided at the bottom of the water distribution tank. The first through hole serves as the inlet of the water distributor, and the second through hole serves as the outlet of the water distributor. The first water-passing medium is made of a sponge-like material. The water distribution tank below the height of the first through hole serves as a sedimentation zone for sewage. Heavier and larger impurities in the sewage settle and are temporarily stored in the sedimentation zone. The surface sewage slowly enters the water distribution tank through the first through hole for sewage distribution. At the same time, the first through hole also acts as a filter to intercept larger impurities and achieve efficient filtration. The water distribution tank and water distributor have a detachable structure, which makes it easy to clean the sediment or filtered impurities in the water distribution tank.

2. The integrated wastewater treatment device according to claim 1, characterized in that: The filtration structure includes a water-passing grid, filter media, and a second water-passing medium arranged sequentially from top to bottom inside the filter barrel. A third through hole is opened at the top of the filter barrel, and a fourth through hole is opened at the bottom of the filter barrel. The third through hole serves as the inlet of the filter barrel, and the fourth through hole serves as the outlet of the filter barrel. The second water-passing medium is made of sponge-like material.

3. The integrated wastewater treatment device according to claim 1, characterized in that: It also includes a monitoring probe, which is installed in the intermediate pool.

4. The integrated wastewater treatment device according to claim 3, characterized in that: It also includes a reflux valve and a discharge valve, and the monitoring results of the monitoring probe are used to open or close the reflux valve or the discharge valve in a coordinated manner.

5. The integrated wastewater treatment device according to claim 4, characterized in that: It also includes a frame, load-bearing columns and load-bearing plates. The top and bottom ends of the load-bearing columns are fixedly connected to the frame. The load-bearing plates are spaced apart on the load-bearing columns. The water distribution tank and the filter assembly are located on different load-bearing plates.

6. The integrated wastewater treatment device according to claim 5, characterized in that: It also includes a control system, which is electrically connected to the monitoring probe, the reflux valve and the discharge valve respectively. The frame is covered with a housing, and the control system is mounted on the housing.

7. The integrated wastewater treatment device according to claim 1, characterized in that: The sterilization device uses an ultraviolet lamp; and / or the deodorization device uses an exhaust fan and an adsorption device.

8. The integrated wastewater treatment device according to claim 7, characterized in that: The adsorption device uses a biochar curtain.

9. A wastewater treatment system, characterized in that: It includes at least two integrated wastewater treatment devices as described in any one of claims 1-8, arranged in parallel.

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