A domestic sewage treatment and reuse system for rural areas

Abstract

The present invention discloses a domestic sewage treatment and reuse system for rural areas, belonging to the technical field of sewage treatment, including: an initial precipitation unit for precipitating the centrally collected domestic sewage to obtain the supernatant of the sewage; a water quality purification unit for filtering the supernatant of the sewage; a drip irrigation reuse unit for transporting the supernatant of the sewage to small vegetable gardens or green belts for reuse; an information collection unit for obtaining parameter information related to the drip irrigation reuse of sewage through Internet of Things technology; and an intelligent control unit for analyzing the obtained parameter information and determining the flow direction of the supernatant of the sewage. The present invention obtains parameter information related to drip irrigation, such as soil water shortage information, weather information, etc. through the information collection unit, and uses this information to judge whether to enable the drip irrigation reuse unit. At the same time, the drip irrigation duration is also determined based on the parameter information, so as to achieve the precise supply of water and fertilizer by sewage according to the needs of crops and ensure the full utilization of resources.

Description

Technical Field

[0001] The present invention belongs to the technical field of sewage treatment, and particularly relates to a domestic sewage treatment and reuse system for rural areas. Background Art

[0002] Rural domestic sewage mainly refers to the sewage generated by the living activities of rural residents, mainly including the drainage of toilet flushing, washing, bathing, and kitchens. Its drainage volume changes with time and seasons, showing the characteristics of intermittent discharge and large instantaneous water volume changes. Its water quality has the characteristics of low pollutant concentration, very little content of heavy metals and toxic and harmful substances, simple types of pollutants, and mainly organic pollution.

[0003] Most of the existing rural domestic sewage treatments are to purify the sewage and discharge it after meeting the standard discharge requirements for reuse. However, since the domestic sewage still contains a large amount of organic fertilizer components, direct purification treatment is likely to cause waste of resources. Summary of the Invention

[0004] The purpose of the present invention is to provide a domestic sewage treatment and reuse system for rural areas to solve the problems faced in the above background art.

[0005] The purpose of the present invention can be achieved by the following technical solutions:

[0006] A domestic sewage treatment and reuse system for rural areas, the system includes:

[0007] An initial sedimentation unit, which is used to sediment the centrally collected domestic sewage to obtain the supernatant of the sewage after primary sedimentation;

[0008] A water quality purification unit, which filters the supernatant of the sewage through a composite ecological filtration technology;

[0009] A drip irrigation reuse unit, which is used to transport the supernatant of the sewage to small vegetable gardens or green belts for watering and fertilizing for reuse;

[0010] An information collection unit, which obtains parameter information related to the drip irrigation reuse of sewage through the Internet of Things technology;

[0011] An intelligent control unit, which is used to analyze according to the obtained parameter information, and thus transport the supernatant of the sewage to the water quality purification unit or the drip irrigation reuse unit.

[0012] Further, the water purification unit includes a sedimentation tank, on which an integrated water inlet pipe is installed. The integrated water inlet pipe is connected to the drainage pipes of multiple households. On one side of the sedimentation tank, there is also a water distribution tank, and an overflow weir is provided between the water distribution tank and the sedimentation tank.

[0013] Further, the water purification unit includes a volcanic rock filter tank. On one side of the volcanic rock filter tank, there is a zeolite filter tank. On one side of the zeolite filter tank, there is a ceramsite filter tank. On one side of the ceramsite filter tank, there is a clear water tank, and an outlet pipe is installed on the clear water tank.

[0014] Further, a plurality of volcanic rocks, zeolites, and ceramsites are respectively provided in the volcanic rock filter tank, the zeolite filter tank, and the ceramsite filter tank. The particle size of the volcanic rock is 5 - 8 cm, the particle size of the zeolite is 3 - 5 cm, and the particle size of the ceramsite is 1 - 3 cm. The volcanic rock filter tank, the zeolite filter tank, and the ceramsite filter tank are connected by water pipes, and the water pipes are arranged in a vertically staggered manner at the water inlet and outlet of each filter tank.

[0015] Further, the drip irrigation and reuse unit includes a resource reuse tank, on which a water pump is installed. The water pump is connected to a drip irrigation pipe through a reuse pipe, and the drip irrigation pipe is used to transport the treated wastewater to the small vegetable garden and the green belt for watering and fertilizing.

[0016] Further, a first water distribution pipe and a second water distribution pipe are also provided at the water distribution tank. The first water distribution pipe is connected to the volcanic rock filter tank, and the second water distribution pipe is connected to the resource reuse tank. The installation height of the second water distribution pipe is 20 cm lower than that of the first water distribution pipe.

[0017] Further, the intelligent control unit includes a controller and a solenoid valve. The solenoid valve is installed on the second water distribution pipe, and the controller is used to analyze the acquired information to control the opening of the solenoid valve.

[0018] Further, the working method of the controller is as follows:

[0019] The solenoid valve is in a closed state under normal conditions. The supernatant of the sewage in the initial sedimentation unit flows into the water purification unit through the first water distribution pipe for purification treatment and then is discharged after reaching the standard;

[0020] A plurality of humidity sensors are installed in the soil of the small vegetable garden and the green belt to obtain the moisture value of the soil , and through the formula the water content state value is obtained , and the real - time temperature value and the light intensity are obtained from the meteorological bureau, and through the formula the judgment coefficient is obtained , when the judgment coefficient is greater than 1, the solenoid valve is opened, and the supernatant of the sewage preferentially flows into the resource recycling pool through the second water distribution pipe;

[0021] In the formula, and are weight coefficients, is the average soil moisture, is the highest moisture value, is the number of sensors whose moisture values exceed the average moisture value among all humidity sensors, is the moisture value obtained by the i-th sensor among sensors, and is the temperature control value, is the light intensity control value, is the judgment threshold.

[0022] Furthermore, the controller is also used to analyze the acquired information to determine the drip irrigation duration, and its working method is:

[0023] When the solenoid valve is opened, obtain the average temperature of the next day from the meteorological bureau , humidity , light intensity and rainfall , calculate the drip irrigation duration , and the expression of the drip irrigation duration is: ;

[0024] In the formula, is the influence coefficient, is the drip irrigation area, is the drip irrigation head flow rate.

[0025] Advantages of the present invention:

[0026] The present invention combines sewage treatment with intelligent drip irrigation. The water quality purification unit filters the supernatant of the sewage through a composite ecological filtration technology and discharges it after reaching the standard. The drip irrigation reuse unit fully retains the organic fertilizer components in the sewage after removing the larger impurities in the sewage, and irrigates the small vegetable garden or the roadside green belt for reuse, ensuring the full utilization of resources.

[0027] The present invention also uses the information acquisition unit to obtain parameter information related to drip irrigation, such as soil water shortage information, weather information, etc., and uses this information to judge whether to enable the drip irrigation reuse unit. At the same time, the drip irrigation duration is determined based on the parameter information, so as to achieve precise supply of water and fertilizer according to the needs of crops and ensure the full utilization of resources.

[0028] Of course, it is not necessary for any product implementing the present invention to simultaneously achieve all the above-mentioned advantages. Brief Description of the Drawings

[0029] To more clearly illustrate the technical solutions of the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0030] Figure 1 It is the system structure block diagram of the present invention;

[0031] Figure 2 It is the plan view of the system of the present invention;

[0032] Figure 3 It is the sectional view of the system of the present invention.

[0033] Description of the drawings in the figure:

[0034] 1. Household; 2. Inlet pipe; 3. Sedimentation tank; 4. Overflow weir; 5. Distribution tank; 6. Volcanic rock filter tank; 7. Volcanic rock; 8. Zeolite filter tank; 9. Zeolite; 10. Ceramsite filter tank; 11. Ceramsite; 12. Clear water tank; 13. Outlet pipe; 14. First distribution pipe; 15. Cross pipe; 16. Second distribution pipe; 17. Resource reuse tank; 18. Water pump; 19. Reuse pipe; 20. Drip irrigation pipe; 21. Vegetable garden; 22. Green belt; 23. Solenoid valve; 24. Controller. Detailed Embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0036] In one embodiment, a domestic sewage treatment and reuse system for rural areas is disclosed. As Figure 1 shown, the system includes:

[0037] An initial sedimentation unit for sedimenting the centrally collected domestic sewage to obtain the supernatant of the sewage after primary sedimentation;

[0038] A water quality purification unit for filtering the supernatant of the sewage through a composite ecological filtration technology;

[0039] A drip irrigation and reuse unit for conveying the supernatant of the sewage to the vegetable garden or the green belt for watering and fertilizing and for reuse;

[0040] An information collection unit, which obtains parameter information related to sewage drip irrigation reuse through Internet of Things technology;

[0041] An intelligent control unit, which is used to analyze according to the obtained parameter information, so as to transport the supernatant of sewage to the water quality purification unit or the drip irrigation reuse unit.

[0042] Through the above technical solution, the present application combines sewage treatment with intelligent drip irrigation. The water quality purification unit filters the supernatant of sewage through a composite ecological filtration technology and discharges it after reaching the standard. The drip irrigation reuse unit fully retains the organic fertilizer components in the sewage after removing larger impurities in the sewage, and drips it into small vegetable gardens or roadside green belts for reuse, ensuring the full utilization of resources; at the same time, the information collection unit is also used to obtain parameter information related to drip irrigation, such as soil water shortage information, weather information, etc., and judge whether to enable the drip irrigation reuse unit by means of these information, so as to realize the accurate supply of water and fertilizer according to the needs of crops and ensure the full utilization of resources.

[0043] Such as Figure 2 、 Figure 3As shown in the figure, the water purification unit includes a sedimentation tank 3, on which an integrated water inlet pipe 2 is installed. The integrated water inlet pipe 2 is connected to the drainage pipes of multiple households 1. On one side of the sedimentation tank 3, there is also a water distribution tank 5, and an overflow weir 4 is provided between the water distribution tank 5 and the sedimentation tank 3. The domestic sewage generated by the households 1 is centrally collected and enters the sedimentation tank 3 through the water inlet pipe 2 for sedimentation. Large impurities, heavier gravel, some suspended solids and organic matter can be removed by sedimentation. The supernatant of the sedimentation tank 3 enters the water distribution tank 5 through the overflow weir 4, and then enters the water purification unit through two water distribution pipes. After being treated to meet the standards, it is discharged externally or enters the drip irrigation reuse unit for watering and fertilizing. At the water distribution tank 5, there are also a first water distribution pipe 14 and a second water distribution pipe 16. The first water distribution pipe 14 is connected to the volcanic rock filter tank 6, and the second water distribution pipe 16 is connected to the resource reuse tank 17. The installation height of the second water distribution pipe 16 is 20 cm lower than that of the first water distribution pipe 14. The intelligent control unit includes a controller 24 and a solenoid valve 23. The solenoid valve 23 is installed on the second water distribution pipe 16. The controller 24 is used to analyze the acquired information to control the opening of the solenoid valve 23. When drip irrigation is not normally required, the solenoid valve 23 is in a closed state, and the sewage supernatant flows into the composite ecological filter tank in the water purification unit through the first water distribution pipe 14. The water purification unit mainly includes a volcanic rock filter tank 6. On one side of the volcanic rock filter tank 6, there is a zeolite filter tank 8. On one side of the zeolite filter tank 8, there is a ceramsite filter tank 10. On one side of the ceramsite filter tank 10, there is a clear water tank 12. An outlet pipe 13 is installed on the clear water tank 12. There are multiple volcanic rocks 7, zeolites 9, and ceramsites 11 in the volcanic rock filter tank 6, zeolite filter tank 8, and ceramsite filter tank 10 respectively. The particle size of the volcanic rock 7 is 5 - 8 cm, the particle size of the zeolite 9 is 3 - 5 cm, and the particle size of the ceramsite 11 is 1 - 3 cm. The sewage passes through the volcanic rock filter tank 6, zeolite filter tank 8, and ceramsite filter tank 10 in sequence for sufficient filtration and adsorption. The volcanic rock filter tank 6, zeolite filter tank 8, and ceramsite filter tank 10 are connected by water pipes 15, and each water pipe 15 is arranged in a vertically staggered manner at the water inlet and outlet of each filter tank. In this way, the sewage enters and exits each partition of each filter tank in a vertically staggered manner, ensuring that the water flow moves vertically up and down and in an "S" - shaped path horizontally. This can extend the contact time between the sewage and the filter media and the surface biofilm, enhance the purification ability, and the water purified by the ecological filter tank is discharged up to the standard through the clear water tank 12.When the controller 24 detects the need for watering and fertilizing, it then controls the solenoid valve 23 to open. Since the installation height of the second water distribution pipe 16 is 20 cm lower than that of the first water distribution pipe 14, the supernatant of the sewage will preferentially flow into the drip irrigation reuse unit. The drip irrigation reuse unit includes a resource reuse pool 17, and a water pump 18 is installed at the resource reuse pool 17. The water pump 18 is connected to the drip irrigation pipe 20 through a reuse pipe 19. The drip irrigation pipe 20 is used to transport the treated wastewater to the small vegetable garden 21 and the green belt 22 for watering and fertilizing. In this way, through the action of the water pump 18, the sewage is transported to each drip irrigation pipe 20 to water and fertilize the small vegetable garden 21 and the green belt 22, thereby realizing the reuse of wastewater.

[0044] The domestic sewage generated by the household 1 is centrally collected and enters the sedimentation tank 3 through the water inlet pipe 2 for sedimentation. Large impurities, relatively heavy sand and gravel, some suspended substances and organic matters are removed by sedimentation. The supernatant of the sedimentation tank 3 enters the distribution pool 5 through the overflow weir 4, and then enters the compound ecological filter through the water distribution pipe for treatment and discharge up to the standard or enters the drip irrigation system for watering and fertilizing. There are two water distribution pipes in the distribution pool 5. The drip irrigation system water distribution pipe (the second water distribution pipe 16) is 20 cm lower than the compound ecological filter water distribution pipe (the first water distribution pipe 14). The drip irrigation system water distribution pipe is equipped with a solenoid valve 23; when it is sunny or hot, the solenoid valve 23 on the drip irrigation system water distribution pipe is opened, and the supernatant of the sedimentation tank 3 preferentially flows into the resource reuse pool 17, and the sewage rich in organic matter is transported to the small vegetable garden 21 or the green belt 22 beside the village road through the drip irrigation system for watering and fertilizing; when it is rainy or cold, the solenoid valve 23 on the drip irrigation system water distribution pipe is closed, and the supernatant of the sedimentation tank 3 flows into the compound ecological filter through the first water distribution pipe 14 for filtration treatment and then is discharged after reaching the standard.

[0045] The working method of the controller 24 is as follows: the solenoid valve 23 is in a closed state under normal conditions, and the supernatant of the sewage in the initial sedimentation unit flows into the water quality purification unit through the first water distribution pipe 14 for purification treatment and then is discharged after reaching the standard; a plurality of humidity sensors are installed in the soil of the small vegetable garden 21 and the green belt 22 to obtain the moisture value of the soil , through the formula to obtain the water content state value , and obtain the real-time temperature value from the meteorological bureau and the light intensity , through the formula to obtain the judgment coefficient , when the judgment coefficient is greater than 1, the solenoid valve 23 is opened, and the supernatant of the sewage preferentially flows into the resource reuse pool 17 through the second water distribution pipe 16. In the formula, and are weight coefficients, is the average soil moisture, is the highest moisture value, is the number of sensors among all humidity sensors whose moisture value exceeds the average moisture value. is the moisture value obtained by the i-th sensor among sensors, and is the temperature control value, is the light intensity control value, is the judgment threshold.

[0046] The above technical solution provides a method for the controller 24 to control the solenoid valve 23 to open. The most intuitive manifestation of the need for watering is generally the water content of the soil. The smaller the water content, the more urgent it is. Therefore, multiple humidity sensors are installed in the soil to obtain the moisture value of the soil , and the water content state value is obtained through the formula , where , in the formula, and are weight coefficients, and their assigned values are determined according to the actual situation of the soil, but the values of both are always 1. For example, let , , is the average soil moisture, is the highest moisture value, is the number of sensors among all humidity sensors whose moisture value exceeds the average moisture value, is the moisture value obtained by the i-th sensor among sensors. Analyzing the average moisture of all sensors detected and the highest moisture value here can better represent the water content of the entire area. And represents an out-of-tolerance state of the water content of the entire area relative to the average value. The larger the value, the more the water content rate. Therefore, when the water content state value is larger, it means the better the water content condition, otherwise it means the more serious the water shortage; and the water shortage situation is not only related to the soil moisture but also related to temperature, light intensity, etc. The higher the temperature and the greater the light intensity, the greater the water evaporation. Therefore, after obtaining the water content state value, obtain the real-time temperature value and the light intensity from the meteorological bureau. After standardizing these data, the judgment coefficient is obtained through the formula , in the formula is the temperature control value, is the light intensity control value, is the judgment threshold, which can be determined according to the control experiment data. It can be seen that when the judgment coefficient is greater than 1, it means that the soil water content rate is low, the temperature is high, and the light intensity is high at this time, indicating that the soil is in a water shortage state, and watering is required. At this time, the solenoid valve 23 is opened, and the sewage supernatant preferentially flows into the resource reuse pool 17 through the second water distribution pipe 16 to achieve the watering operation.

[0047] The controller 24 is also used to analyze according to the acquired information so as to determine the drip irrigation duration. Its working method is as follows: when the solenoid valve 23 is opened, the average temperature of the next day is obtained from the meteorological bureau , humidity , light intensity and rainfall , and the drip irrigation duration is calculated . The expression of the drip irrigation duration is as follows: ; in the formula, is the influence coefficient, is the drip irrigation area, is the drip head flow rate.

[0048] The above solution provides a specific method for the controller 24 to determine the drip irrigation duration. First, the average temperature of the next day is obtained from the meteorological bureau , humidity , light intensity and rainfall . After standardization processing, the drip irrigation duration is then calculated . The expression of the drip irrigation duration is as follows: , in the formula, is the influence coefficient, is the drip irrigation area, is the drip head flow rate. It can be seen from the formula that when the value is larger, it indicates that the water shortage is more serious, so the required drip irrigation duration will also increase. And for the drip irrigation area being large, the drip irrigation duration will also increase. The formula represents the influence of future weather on irrigation. The larger its value, the longer the irrigation duration. And is the influence coefficient, which can be determined manually according to the actual situation. For example, it can be determined by comprehensively considering factors such as the soil quality of the drip irrigation area, the types and growth stages of crops, etc. In this way, the drip irrigation duration can be accurately calculated according to the water shortage situation and future weather conditions, so as to ensure the accurate supply of water and fertilizer by sewage according to the crop requirements, which is beneficial to crop growth.

[0049] It should be noted that the above calculation formulas are all dimensionless calculations after standardizing the data and selecting specific units, and the processing methods can be obtained through existing technologies, so no more description is given here.

[0050] The above content is only an example and explanation of the concept of the present invention. Those skilled in the art of this technology make various modifications or supplements or use similar ways to replace the specific embodiments described, as long as they do not deviate from the concept of the invention or exceed the scope defined by this claim book, they should all belong to the protection scope of the present invention.

Claims

1. A domestic sewage treatment and reuse system for rural areas, characterized in that, The system includes: An initial precipitation unit for precipitating the centrally collected domestic sewage to obtain the supernatant of the sewage after primary sedimentation; A water quality purification unit for filtering the supernatant of the sewage through a composite ecological filtration technology; A drip irrigation reuse unit for transporting the supernatant of the sewage to a small vegetable garden or a green belt for watering and fertilizing for reuse; An information collection unit for obtaining parameter information related to the drip irrigation reuse of sewage through the Internet of Things technology; An intelligent control unit for analyzing the obtained parameter information and thus transporting the supernatant of the sewage to the water quality purification unit or the drip irrigation reuse unit; The intelligent control unit includes a controller (24) and a solenoid valve (23). The solenoid valve (23) is installed on the second water distribution pipe (16), and the controller (24) is used for analyzing the obtained information to control the opening of the solenoid valve (23); The working method of the controller (24) is as follows: The solenoid valve (23) is in a closed state under normal conditions. The supernatant of the sewage from the initial precipitation unit flows into the water quality purification unit through the first water distribution pipe (14), and is discharged after being purified to meet the standards; Install multiple humidity sensors in the soil of small vegetable gardens and green belts to obtain the moisture values of the soil , through the formula to obtain the water content state value , and obtain the real-time temperature value from the meteorological bureau and the light intensity , through the formula to obtain the judgment coefficient , when the judgment coefficient is greater than 1, open the solenoid valve (23), and the supernatant of the sewage flows into the resource reuse pool (17) through the second water distribution pipe (16); In the formula, and are weight coefficients, is the average soil moisture, is the highest moisture value, is the number of sensors among all humidity sensors whose moisture values exceed the average moisture value, is the moisture value obtained by the i-th sensor among sensors, and is the temperature control value, is the light intensity control value, is the judgment threshold.

2. The domestic sewage treatment and reuse system for rural areas according to claim 1, characterized in that, The water quality purification unit includes a sedimentation tank (3). An integrated water inlet pipe (2) is installed on the sedimentation tank (3), and the integrated water inlet pipe (2) is connected to the drainage pipes of multiple households (1). An overflow weir (4) is provided between a water distribution tank (5) and the sedimentation tank (3) on one side of the sedimentation tank (3); 3. A domestic sewage treatment and reuse system for rural areas according to claim 2, characterized in that, The water quality purification unit includes a volcanic rock filter tank (6). A zeolite filter tank (8) is provided on one side of the volcanic rock filter tank (6), a ceramsite filter tank (10) is provided on one side of the zeolite filter tank (8), and a clear water tank (12) is provided on one side of the ceramsite filter tank (10). An outlet pipe (13) is installed on the clear water tank (12); 4. A domestic sewage treatment and reuse system for rural areas according to claim 3, characterized in that, Multiple volcanic rocks (7), zeolites (9), and ceramsites (11) are respectively provided in the volcanic rock filter tank (6), the zeolite filter tank (8), and the ceramsite filter tank (10). The particle size of the volcanic rocks (7) is 5 - 8 cm, the particle size of the zeolites (9) is 3 - 5 cm, and the particle size of the ceramsites (11) is 1 - 3 cm. The volcanic rock filter tank (6), the zeolite filter tank (8), and the ceramsite filter tank (10) are connected through water pipes (15), and the water pipes (15) are arranged in a vertically staggered manner at the water inlet and outlet of each filter tank; 5. The domestic sewage treatment and reuse system for rural areas according to claim 4, characterized in that The drip irrigation reuse unit includes a resource reuse tank (17). A water pump (18) is installed at the resource reuse tank (17). The water pump (18) is connected to a drip irrigation pipe (20) through a reuse pipe (19), and the drip irrigation pipe (20) is used for transporting the treated wastewater to a small vegetable garden and a green belt for watering and fertilizing.

6. The domestic sewage treatment and reuse system for rural areas according to claim 5, characterized in that, A first water distribution pipe (14) and a second water distribution pipe (16) are also provided at the water distribution tank (5). The first water distribution pipe (14) is connected to the volcanic rock filter tank (6), and the second water distribution pipe (16) is connected to the resource recycling tank (17). Moreover, the installation height of the second water distribution pipe (16) is 20 cm lower than that of the first water distribution pipe (14).

7. A domestic sewage treatment and reuse system for rural areas according to claim 6, characterized in that, The controller (24) is further configured to analyze the acquired information to determine the drip irrigation duration, and its working method is as follows: When the solenoid valve (23) is opened, the average temperature for the next day is obtained from the meteorological bureau , humidity , light intensity and rainfall , and the drip irrigation duration is calculated , and the drip irrigation duration expression is: ; In the formula, is the influence coefficient, is the area of the drip irrigation area, is the flow rate of the drip emitter.

Images