Sewage treatment equipment based on solar energy

Abstract

The invention relates to sewage treatment equipment, and discloses sewage treatment equipment based on solar energy, the sewage treatment equipment comprises a solar power generation part and a sewage treatment part, the sewage treatment part comprises a sludge drying device used for drying sludge, the sludge drying device comprises a wet sludge collection box, a sewage treatment device and a sewage treatment device, the sludge collector is used for collecting sludge subjected to precipitation treatment; the dry sludge collecting box is used for collecting the dried sludge; the solar drying assembly comprises a drying pipe and a conveying screw rod, and the drying pipe is connected between the wet sludge collecting box and the dry sludge collecting box and is used for absorbing solar energy to dry sludge in the wet sludge collecting box and the dry sludge collecting box; the conveying screw rod is arranged in the drying pipe and is used for conveying the wet sludge in the wet sludge collecting box to the dry sludge collecting box. According to the sewage treatment equipment, the sludge drying efficiency is improved by utilizing solar energy, so that the sewage treatment capacity of small and miniature sewage treatment equipment is effectively improved, and the sewage treatment equipment is suitable for remote places such as electric fields.

Description

Technical Field

[0001] The present invention relates to the technical field of sewage treatment, and more particularly, to a solar-based sewage treatment device. Background Art

[0002] Sewage has always been one of the important factors causing environmental pollution. Different types of sewage are generated in different places, and different sewage treatment methods also exist. For example, in new energy power generation stations in remote areas, the common types of sewage are domestic sewage of maintenance personnel and waste water from equipment maintenance and cleaning. Since the power plant is generally located in a remote area and the sewage volume is not large, it is not cost-effective to arrange sewage treatment equipment separately. Generally, small or micro sewage treatment equipment can meet the daily sewage treatment requirements.

[0003] For places far from the grid power supply or where it is difficult to lay cables, build poles, guy wires, etc., sewage treatment equipment cannot be used. In the prior art, small sewage treatment equipment based on photovoltaic power generation has emerged, which provides the demand for using electrical energy without relying on the grid power supply for the operation of sewage treatment equipment. However, for the existing small sewage treatment equipment, due to its small volume, there are still problems such as slow drying speed and low treatment volume during the final sludge drying process, resulting in very troublesome treatment of undried sludge. Summary of the Invention

[0004] In view of the sludge drying problem existing in the existing small sewage treatment equipment, the present invention provides a solar-based sewage treatment device, which can utilize the abundant solar energy in remote areas to achieve rapid sludge drying treatment and improve the sewage treatment capacity of the equipment.

[0005] The present invention is achieved through the following technical solutions:

[0006] A solar-based sewage treatment device includes a solar power generation part and a sewage treatment part. The sewage treatment part includes a sludge drying device for drying sludge. The sludge drying device includes:

[0007] A wet sludge collection box for collecting sludge after sedimentation treatment;

[0008] A dry sludge collection box for collecting dried sludge;

[0009] A solar drying assembly, including a drying pipe and a conveying screw. The drying pipe is connected between the wet sludge collection box and the dry sludge collection box, and is used to absorb solar energy to dry the sludge therein. The conveying screw is arranged in the drying pipe and is used to convey the wet sludge in the wet sludge collection box to the dry sludge collection box.

[0010] Optionally, the solar drying components are provided in a plurality of groups, and the plurality of groups of solar drying components are arranged in an array along an inclined straight path between the wet sludge collection box and the dry sludge collection box.

[0011] Optionally, the drying pipes and conveying screws of the several groups of solar drying components extend into the wet sludge collection box, each drying pipe is provided with a sludge inlet in the upper area for sludge to enter the drying pipe, and a sewage outlet in the lower area for sewage to be discharged. The drying pipes are interconnected by partitions, dividing the wet sludge collection box into two areas.

[0012] Optionally, a liquid level float valve is provided at the lower portion of the wet sludge collection box, which is used to discharge the sewage in the wet sludge collection box when the liquid level is close to the lowest solar drying component.

[0013] Optionally, the upper area of ​​the drying pipe between the wet sludge collection box and the dry sludge collection box is further provided with a moisture drainage groove arranged along the length direction of the drying pipe.

[0014] Optionally, the conveying screw between the wet sludge collection box and the dry sludge collection box is divided into a first conveying section and a second conveying section, the first conveying section is close to the wet sludge collection box, and the second conveying section is close to the dry sludge collection box, and the conveying screw is provided with a first spiral blade and a second spiral blade with different spiral radii, the spiral radius of the first spiral blade is smaller than the spiral radius of the second spiral blade, and the first conveying section is provided with a cross-arranged first spiral blade and the second conveying section is provided with a second spiral blade.

[0015] Optionally, on the first conveying section, along the conveying direction, the number of first spiral blades spaced between the second spiral blades is arranged in increasing order.

[0016] Optionally, a driving motor is provided at the end of one of the conveying screws, and adjacent conveying screws are connected via a gear transmission pair.

[0017] Optionally, the solar power generation part includes a photovoltaic module, a controller and a battery connected in sequence, and the controller is also connected to an inverter, and the inverter is connected to the power load of the sewage treatment part.

[0018] Optionally, the sewage treatment part includes a septic tank, an equalization tank, an anaerobic tank, an aerobic tank, a sedimentation tank and a clear water tank. The septic tank is used to hold sewage. A grille channel is provided between the septic tank and the equalization tank. A sewage pump is provided in the equalization tank. The sewage in the equalization tank is pumped to the anaerobic tank through the sewage pump. The anaerobic tank, the aerobic tank and the sedimentation tank are connected in sequence. The upper clear water of the sedimentation tank overflows into the clear water tank. The bottom sludge is pumped to the sludge drying device through the sludge pump. The clear water tank is provided with a clear water pump for pumping to the water use position.

[0019] The technical solution of the present invention has at least the following beneficial effects:

[0020] The sewage treatment equipment based on solar energy of the present invention can utilize the abundant solar energy to transport sludge between the wet sludge collection tank and the dry sludge collection tank, and use the drying pipe to absorb solar energy to dry the sludge. At the same time, cooperating with the conveying screw, it can realize turning and moving in the drying pipe while conveying in the drying pipe, thereby improving the drying efficiency. With the improvement of the sludge drying efficiency, the sewage treatment capacity of the entire sewage treatment system is also significantly improved. Description of the Drawings

[0021] Figure 1 is the principle block diagram of the sewage treatment equipment based on solar energy of the present invention;

[0022] Figure 2 is the structure diagram of the sludge drying device of the present invention;

[0023] Figure 3 is the front view of the sludge drying device of the present invention;

[0024] Figure 4 is Figure 3 the enlarged view of part A of

[0025] Figure 5 is Figure 3 the sectional view taken along line B-B of

[0026] Figure 6 is Figure 4 the enlarged view of part D of

[0027] Figure 7 is the sectional view of the wet sludge collection tank of the present invention in the working state;

[0028] Figure 8 is Figure 3 the sectional view taken along line C-C of

[0029] Figure 9 is the partial front sectional view of the sludge drying device of the present invention.

[0030] Reference Signs:

[0031] 100 - Solar power generation part, 110 - Photovoltaic module, 120 - Controller, 130 - Storage battery, 140 - Inverter;

[0032] 200 - Sewage treatment section, 210 - Septic tank, 220 - Regulation tank, 221 - Sewage pump, 230 - Anaerobic tank, 240 - Aerobic tank, 241 - Blower, 250 - Sedimentation tank, 251 - Sludge pump, 260 - Clear water tank, 261 - Clear water pump, 270 - Sludge drying device, 271 - Wet sludge collection tank, 2711 - Float level valve, 272 - Solar drying module, 2721 - Conveyor screw, 2721a - Driving motor, 2721b - Gear transmission pair, 2721c - First helical blade, 2721d - Second helical blade, 2721-1 - First conveying section, 2721-2 - Second conveying section, 2722 - Drying pipe, 2722a - Sludge inlet, 2722b - Sewage outlet, 2722c - Partition board, 2722d - Moisture discharge groove, 273 - Dry sludge collection tank. Detailed implementation manners

[0033] Referring to Figure 1 , the solar - based sewage treatment equipment of the present invention includes a solar power generation section 100 and a sewage treatment section 200. Among them, the sewage treatment section 200 includes a septic tank 210, a regulation tank 220, an anaerobic tank 230, an aerobic tank 240, a sedimentation tank 250, and a clear water tank 260. The septic tank 210 is used to hold sewage and collect sewage generated in life and work. A grid channel is provided between the septic tank 210 and the regulation tank 220, which is used to simply filter the sewage in the septic tank 210 and send it to the regulation tank 220. A sewage pump 221 is provided in the regulation tank 220, which can pump the sewage in the regulation tank 220 to the anaerobic tank 230 according to the subsequent treatment capacity. The anaerobic tank 230, the aerobic tank 240, and the sedimentation tank 250 are connected in sequence. The sewage is sequentially subjected to anaerobic treatment, aerobic treatment, and sedimentation treatment. The upper - layer clear water in the sedimentation tank 250 overflows into the clear water tank 260, and the bottom sludge is pumped to the sludge drying device 270 by the sludge pump 251. A clear water pump 261 is provided in the clear water tank 260, which is used to pump water to the water - using positions, such as irrigation water, fire - fighting water, road sprinkling water, toilet flushing water, etc. The equipment and processes of the sewage treatment section 200 except for the sludge drying device 270 can be realized by using conventional equipment and processes in the art, and will not be described in detail in this embodiment.

[0034] The solar power generation part 100 includes a photovoltaic module 110, a controller 120, and a storage battery 130 that are connected in sequence. The controller 120 is also connected to an inverter 140, and the inverter 140 is connected to the electrical loads of the sewage treatment part 200. After the photovoltaic module 110 converts solar energy into direct current, it passes through the controller 120 and the inverter 140 to finally form alternating current, which is connected to the electrical loads such as the sewage pump 221, the blower 241, the sludge pump 251, and the clean water pump 261 of the sewage treatment part 200. The excess electricity is stored in the storage battery 130. In this embodiment, the solar power generation part 100 can also be implemented by using conventional equipment and processes in the art, and will not be described in detail in this embodiment.

[0035] Referring to Figures 2 - 9 , the sewage treatment part 200 further includes a sludge drying device 270 for drying the sludge. The sludge drying device 270 includes a wet sludge collection tank 271, a solar drying component 272, and a dry sludge collection tank 273. The wet sludge at the bottom of the sedimentation tank 250 is pumped into the wet sludge collection tank 271 by the sludge pump 251, collected by the wet sludge collection tank 271, then the sludge is dried by the solar drying component 272, and then transported to the dry sludge collection tank 273. The dry sludge collection tank 273 collects the dried sludge. The dried sludge has a reduced volume, reduced mass, and reduced moisture content, making it more convenient to handle. For example, the dry sludge can be used as a nutrient or landfilled.

[0036] Among them, the solar drying component 272 includes a drying pipe 2722 and a conveying screw 2721. The drying pipe 2722 is connected between the wet sludge collection tank 271 and the dry sludge collection tank 273 and is used to absorb solar energy to dry the sludge therein. The surface of the drying pipe 2722 is coated with a heat-absorbing material, similar to the heat-absorbing pipe structure on a solar water heater. The conveying screw 2721 is arranged inside the drying pipe 2722 and is used to transport the wet sludge in the wet sludge collection tank 271 to the dry sludge collection tank 273. The sludge in the wet sludge collection tank 271 enters the drying pipe 2722 and is gradually transported to the dry sludge collection tank 273 through the conveying screw 2721 in the drying pipe 2722. During the transportation process, the speed is generally slow. Through the spiral blade structure on the conveying screw 2721, the sludge can be squeezed towards the dry sludge collection tank 273, and the squeezing process is a spiral moving path, enabling the sludge to be dried by the heat absorbed by the drying pipe 2722. Finally, the dried sludge reaches the dry sludge collection tank 273 and is centrally collected for convenient subsequent treatment.

[0037] In this embodiment, several groups of solar drying components 272 are arranged in an array along an inclined linear path between the wet sludge collection box 271 and the dry sludge collection box 273. Through the inclined arrangement structure, the several groups of solar drying components 272 can be exposed to sunlight in a manner of maximum heating area. A driving motor 2721a is provided at the end of one of the conveying screws 2721, and adjacent conveying screws 2721 are connected by a gear transmission pair 2721b. At the same time, the drying pipes 2722 and conveying screws 2721 of several groups of solar drying components 272 are extended into the wet sludge collection box 271. Each drying pipe 2722 is provided with a sludge inlet 2722a in the upper area for sludge to enter the drying pipe 2722, and a sewage outlet 2722b in the lower area for sewage discharge. The drying pipes 2722 and 2722 are connected to each other through a partition 2722c. The partition 2722c can also be made of a mesh structure plate to facilitate water filtration. The overall structure formed by connecting the drying pipes 2722 and the partitions 2722c divides the wet sludge collection box 271 into two areas. The upper area is used to collect wet sludge. The dividing structure has a filtering function, and the lower area collects sewage. The drying pipe 2722 of the solar drying component 272 is arranged at an angle between the two boxes mainly to facilitate the absorption of more solar energy. In the wet sludge collection box 271, the inclined drying pipe 2722 forms a dividing line of the inclined structure. On the one hand, the inclined arrangement can increase the number of solar drying components 272 and improve the processing capacity of sludge drying. On the other hand, after the inclined arrangement, the inclined dividing line formed has a large filtering area, which can improve the processing capacity of wet sludge filtration.

[0038] A liquid level float valve is provided at the lower part of the wet sludge collection box 271, which is used to discharge the sewage in the wet sludge collection box 271 when the liquid level is close to the lowermost solar drying component 272. The discharged sewage can be sent to the regulating tank 220 or other tank bodies of the sewage treatment part 200 for circulation treatment.

[0039] After the sludge pump 251 sends the sewage into the wet sludge collection tank 271, relying on the inclined dividing line formed by the drying pipe 2722, it stays briefly in the upper area of the wet sludge collection tank 271, filters out the sewage through the sewage outlet 2722b, and ensures that the moisture content of the sludge staying in the upper area further decreases. When the conveying screw 2721 is not started, due to the sealing effect of the spiral structure and the blocking effect of the wet sludge, the sewage in the wet sludge collection tank 271 during the filtering process will not flow towards the dry sludge collection tank 273. After staying for a period of time, the conveying screw 2721 can be started. Through the conveying screw 2721, the sludge at one end of the drying pipe 2722 in the wet sludge collection tank 271 is moved towards one end of the dry sludge collection tank 273. When the sludge moves into the drying pipe 2722 between the wet sludge collection tank 271 and the dry sludge collection tank 273, it starts to be dried by the solar energy collected by the drying pipe 2722. The conveying screw 2721 is connected to the driving motor 2721a, and the control of the driving motor 2721a adopts intermittent control. After rotating a certain number of turns, it pauses for a certain period of time to ensure that the sludge in the drying pipe 2722 can fully absorb the heat of the drying pipe 2722.

[0040] Refer to Figure 8 , a moisture discharge groove 2722d arranged along the length direction of the drying pipe 2722 is also provided in the upper area of the drying pipe 2722 between the wet sludge collection tank 271 and the dry sludge collection tank 273. During the drying process, the moisture in the sludge is discharged through the moisture discharge groove 2722d. The moisture discharge groove 2722d adopts a square groove arranged along the length direction of the drying pipe 2722, and the width has a certain size. This size can ensure that the sludge will not block the moisture discharge groove 2722d during the moving process. The height of the moisture discharge groove 2722d is designed to be slightly higher to avoid being extruded out of the drying pipe 2722 from the drainage groove during the extrusion process. Since the spiral transmission is intermittent, even if the sludge is extruded into the moisture discharge groove 2722d, it will fall back into the drying pipe 2722 due to gravity during the pause, avoiding overflow.

[0041] Refer to Figure 9, in order to further improve the drying efficiency of sludge in the drying pipe 2722, the conveying screw 2721 between the wet sludge collection tank 271 and the dry sludge collection tank 273 is divided into a first conveying section 2721-1 and a second conveying section 2721-2. The first conveying section 2721-1 is close to the wet sludge collection tank 271, and the second conveying section 2721-2 is close to the dry sludge collection tank 273. The first spiral blade 2721c and the second spiral blade 2721d with different spiral radii are arranged on the conveying screw 2721. The spiral radius of the first spiral blade 2721c is smaller than that of the second spiral blade 2721d. The first spiral blade 2721c and the second spiral blade 2721d are arranged crosswise on the first conveying section 2721-1, and the second spiral blade 2721d is arranged on the second conveying section 2721-2. The second spiral blade 2721d adopts a structure with a spiral radius close to the inner wall radius of the drying pipe 2722, and its purpose is to scrape off the sludge on the wall of the drying pipe 2722 as much as possible; the first spiral blade 2721c adopts a structure with a spiral radius smaller than that of the second spiral blade 2721d, so that the sludge at the position where the first spiral blade 2721c is located can be laid flat on the inner wall of the pipeline, with good uniformity and improved drying effect. The radius difference is generally selected between 0.5-1.0 cm. When the thickness is too thick, the drying efficiency is relatively low. When the thickness is too thin, the processing capacity will decrease. In this embodiment, the first spiral blade 2721c is generally arranged on the first conveying section 2721-1. The sludge has a high humidity, and the laid flat sludge can move forward under the extrusion of the subsequent sludge; while on the second conveying section 2721-2, the moisture content of the sludge decreases, and it is difficult to move the sludge forward during the extrusion, so it is not suitable to be arranged on the second conveying section 2721-2.

[0042] Further, on the first conveying section 2721-1, along the conveying direction, the number of the first spiral blades 2721c spaced between the second spiral blades 2721d is arranged in an increasing order. For example, in a certain area, first there is a first spiral blade 2721c with a complete spiral cycle. After a second spiral blade 2721d with a complete cycle is spaced, there are two first spiral blades 2721c with complete spiral cycles. After a second spiral blade 2721d with a complete cycle is spaced again, there are three first spiral blades 2721c with complete spiral cycles. In this way, sludge spreading areas with gradually increasing lengths can be formed on the first conveying section 2721-1. Such a structural design, on the one hand, forms an interval distribution in the ordinary areas, which can ensure that when the sludge needs to move, enough extrusion effect can be provided to move the sludge forward; on the other hand, the ordinary areas show a gradually changing trend, which can solve the problem that the sunlight is the most sufficient in the middle section and is easily blocked at the two ends in the early morning and evening, thereby improving the sludge drying effect.

Claims

1. A solar-powered sewage treatment device, comprising a solar power generation part and a sewage treatment part, wherein the sewage treatment part comprises a sludge drying device for drying sludge, characterized in that: The sludge drying device comprises: Wet sludge collection box, used to collect sludge after sedimentation treatment; Dry sludge collection box, used to collect the sludge after drying treatment; The solar drying component includes a drying pipe and a conveying screw. The drying pipe is connected between a wet sludge collection box and a dry sludge collection box and is used to absorb solar energy to dry the sludge therein; the conveying screw is arranged in the drying pipe and is used to convey the wet sludge in the wet sludge collection box to the dry sludge collection box.

2. The solar-powered sewage treatment equipment according to claim 1, characterized in that: The solar drying components are provided in a plurality of groups, and the plurality of groups of solar drying components are arranged in an array along an inclined straight path between the wet sludge collection box and the dry sludge collection box.

3. The solar-based sewage treatment equipment according to claim 2, characterized in that: The drying pipes and conveying screws of the several groups of solar drying components extend into the wet sludge collection box. Each drying pipe is provided with a sludge inlet in the upper area for sludge to enter the drying pipe, and a sewage outlet in the lower area for sewage to be discharged. The drying pipes are connected to each other by partitions, dividing the wet sludge collection box into two areas.

4. The solar-based sewage treatment equipment according to claim 3 is characterized in that: A liquid level float valve is arranged at the lower part of the wet sludge collection box, which is used to discharge the sewage in the wet sludge collection box when the liquid level is close to the solar drying component at the lowermost end.

5. The solar-based sewage treatment equipment according to claim 1, characterized in that: The upper area of ​​the drying pipe between the wet sludge collection box and the dry sludge collection box is also provided with a moisture drainage groove arranged along the length direction of the drying pipe.

6. The solar-based sewage treatment equipment according to claim 1, characterized in that: The conveying screw between the wet sludge collection box and the dry sludge collection box is divided into a first conveying section and a second conveying section, the first conveying section is close to the wet sludge collection box, and the second conveying section is close to the dry sludge collection box. The conveying screw is provided with a first spiral blade and a second spiral blade with different spiral radii, the spiral radius of the first spiral blade is smaller than the spiral radius of the second spiral blade, the first conveying section is provided with a cross-arranged first spiral blade and the second conveying section is provided with a second spiral blade.

7. The solar-based sewage treatment equipment according to claim 6, characterized in that: On the first conveying section, along the conveying direction, the number of first spiral blades spaced between the second spiral blades is arranged in increasing order.

8. The solar-based sewage treatment equipment according to claim 2, characterized in that: A driving motor is arranged at the end of one of the conveying screw rods, and adjacent conveying screw rods are connected through a gear transmission pair.

9. The solar-based sewage treatment equipment according to claim 1, characterized in that: The solar power generation part includes a photovoltaic component, a controller and a battery connected in sequence. The controller is also connected to an inverter, and the inverter is connected to the power load of the sewage treatment part.

10. The solar-based sewage treatment equipment according to claim 1, characterized in that: The sewage treatment part includes a septic tank, a regulating tank, an anaerobic tank, an aerobic tank, a sedimentation tank and a clear water tank. The septic tank is used to hold sewage. A grille channel is provided between the septic tank and the regulating tank. A sewage pump is provided in the regulating tank. The sewage in the regulating tank is pumped to the anaerobic tank through the sewage pump. The anaerobic tank, the aerobic tank and the sedimentation tank are connected in sequence. The upper clear water of the sedimentation tank overflows into the clear water tank. The bottom sludge is pumped to the sludge drying device through the sludge pump. The clear water tank is provided with a clear water pump for pumping to the water use location.

Images