A solar-based sewage treatment device

Abstract

This invention relates to wastewater treatment equipment and discloses a solar-based wastewater treatment device, comprising a solar power generation section and a wastewater treatment section. The wastewater treatment section includes a sludge drying device for drying sludge, comprising: a wet sludge collection tank for collecting sludge after sedimentation treatment; a dry sludge collection tank for collecting dried sludge; and a solar drying assembly including a drying pipe and a conveying screw. The drying pipe is connected between the wet and dry sludge collection tanks and is used to absorb solar energy to dry the sludge therein. The conveying screw is arranged inside the drying pipe and is used to transport the wet sludge from the wet sludge collection tank to the dry sludge collection tank. This wastewater treatment equipment utilizes solar energy to improve the efficiency of sludge drying, thereby effectively improving the wastewater treatment capacity of small-scale wastewater treatment equipment, and is suitable for use in remote locations such as power plants.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and more specifically, to a wastewater treatment device based on solar energy. Background Technology

[0002] Wastewater has always been a major contributor to environmental pollution. Different locations generate different types of wastewater, and the methods of wastewater treatment also vary. For example, in new energy power plants in remote areas, the wastewater typically consists of domestic sewage from plant maintenance personnel and cleaning wastewater from equipment maintenance. Since power plants are usually located in remote areas and the volume of wastewater is small, it is not economically feasible to install separate wastewater treatment equipment. Generally, small or micro wastewater treatment equipment is sufficient to meet daily wastewater treatment requirements.

[0003] For locations far from the power grid or where laying cables, constructing poles, or installing guy wires are difficult, making it impossible to use wastewater treatment equipment, existing technologies have developed small-scale wastewater treatment equipment based on photovoltaic power generation. This provides the power required for the operation of wastewater treatment equipment that can be used without a power grid. However, existing small-scale wastewater treatment equipment still suffers from problems such as slow drying speed and small processing capacity in the final sludge drying process due to its small size, making the treatment of undried sludge very troublesome. Summary of the Invention

[0004] This invention addresses the sludge drying problem in existing small-scale wastewater treatment equipment by providing a solar-powered wastewater treatment device that can utilize the abundant solar energy in remote areas to achieve rapid sludge drying and improve the equipment's wastewater treatment capacity.

[0005] This invention is achieved through the following technical solution:

[0006] A solar-powered wastewater treatment device includes a solar power generation section and a wastewater treatment section. The wastewater treatment section includes a sludge drying device for drying sludge, the sludge drying device comprising:

[0007] Wet sludge collection box, used to collect sludge after sedimentation treatment;

[0008] Dry sludge collection box, used to collect sludge after drying treatment;

[0009] A solar-powered drying assembly 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 inside the drying pipe and is used to transport the wet sludge in the wet sludge collection box to the dry sludge collection box.

[0010] Optionally, the solar drying module is provided in several groups, and the several groups of solar drying modules 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 plurality of solar drying components extend into the wet sludge collection box. Each drying pipe is provided with a sludge inlet in the upper part for sludge to enter the drying pipe and a sewage outlet in the lower part for sewage discharge. The drying pipes are connected to each other by partitions, dividing the wet sludge collection box into two areas.

[0012] Optionally, a liquid level float valve is provided at the bottom of the wet sludge collection tank to drain the wastewater in the wet sludge collection tank when the liquid level is close to the bottom solar drying component.

[0013] Optionally, a dehumidification trough is also provided in the upper part of the drying pipe between the wet sludge collection box and the dry sludge collection box, arranged along the length 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. The conveying screw is equipped with first and second helical blades with different helical radii. The helical radius of the first helical blade is smaller than that of the second helical blade. The first and second helical blades are arranged in a cross pattern on the first conveying section, and the second helical blades are arranged on the second conveying section.

[0015] Optionally, on the first conveying section, along the conveying direction, the number of first spiral blades spaced apart from the second spiral blades is arranged in a sequentially increasing manner.

[0016] Optionally, one of the conveying screws is equipped with a drive motor at its end, and adjacent conveying screws are connected by a gear transmission pair.

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

[0018] Optionally, the wastewater treatment section 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 wastewater. A screen channel is provided between the septic tank and the equalization tank. A wastewater pump is installed in the equalization tank to pump the wastewater in the equalization tank to the anaerobic tank. The anaerobic tank, the aerobic tank, and the sedimentation tank are connected in sequence. The upper layer of clear water in the sedimentation tank overflows into the clear water tank. The bottom sludge is pumped to a sludge drying device by a sludge pump. A clear water pump is installed in the clear water tank to pump water to the water usage location.

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

[0020] The solar-powered wastewater treatment equipment of this invention can utilize the abundant solar energy to transport sludge between wet sludge collection tanks and dry sludge collection tanks. It uses a drying pipe to absorb solar energy to dry the sludge. At the same time, in conjunction with the conveying screw, it can achieve turning and movement within the drying pipe while being transported, thereby improving the drying efficiency. With the improved sludge drying efficiency, the wastewater treatment capacity of the entire wastewater treatment system is also significantly improved. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the solar-powered wastewater treatment equipment of the present invention.

[0022] Figure 2 This is a structural diagram of the sludge drying device of the present invention;

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

[0024] Figure 4 for Figure 3 Enlarged view of part A;

[0025] Figure 5 for Figure 3 BB-direction sectional view;

[0026] Figure 6 for Figure 4 Enlarged view of part D;

[0027] Figure 7 This is a cross-sectional view of the wet sludge collection box of the present invention in use.

[0028] Figure 8 for Figure 3 CC-direction sectional view;

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

[0030] Figure label:

[0031] 100 - Solar power generation section, 110 - Photovoltaic modules, 120 - Controller, 130 - Battery, 140 - Inverter;

[0032] 200 - Wastewater treatment section; 210 - Septic tank; 220 - Equalization tank; 221 - Wastewater 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 box; 2711 - Float level valve; 272 - Solar drying component; 2721 - Conveying screw, 2721a-drive 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-baffle, 2722d-wet trough, 273-dry sludge collection box. Detailed Implementation

[0033] Reference Figure 1 The wastewater treatment equipment based on solar energy of the present invention includes a solar power generation section 100 and a wastewater treatment section 200. The wastewater treatment section 200 includes a septic tank 210, an equalization 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 wastewater and collect wastewater generated during domestic and work operations. A screen channel is provided between the septic tank 210 and the equalization tank 220 to simply filter the sewage in the septic tank 210 before sending it to the equalization tank 220. A sewage pump 221 is installed in the equalization tank 220, which can pump the sewage from the equalization tank 220 to the anaerobic tank 230 according to the downstream processing capacity. The anaerobic tank 230, aerobic tank 240, and sedimentation tank 250 are connected in sequence. The sewage undergoes anaerobic treatment, aerobic treatment, and sedimentation treatment sequentially. The upper layer of 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. The clear water tank 261 is equipped with a clear water pump 261 for pumping water to water usage locations, such as irrigation water, fire fighting water, road sprinkling water, and toilet flushing water. Except for the sludge drying device 270, the equipment and processes of the sewage treatment section 200 can be implemented using conventional equipment and processes in the field, and will not be described in detail in this embodiment.

[0034] The solar power generation section 100 includes a photovoltaic module 110, a controller 120, and a battery 130 connected in sequence. The controller 120 is also connected to an inverter 140, which is connected to the electrical loads of the wastewater treatment section 200. Solar energy is converted into direct current (DC) by the photovoltaic module 110, and then converted into alternating current (AC) by the controller 120 and inverter 140. This AC power is then connected to the electrical loads of the wastewater treatment section 200, such as the wastewater pump 221, the blower 241, the sludge pump 251, and the clean water pump 261. Excess electricity is stored in the battery 130. In this embodiment, the solar power generation section 100 can also be implemented using conventional equipment and processes in the art, which will not be described in detail here.

[0035] Reference Figure 2-9 The wastewater treatment section 200 also includes a sludge drying device 270 for drying 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 to the wet sludge collection tank 271 by the sludge pump 251, collected by the wet sludge collection tank 271, and then dried by the solar drying component 272 before being transported to the dry sludge collection tank 273. The dry sludge collection tank 273 collects the dried sludge. The dried sludge has a smaller volume, smaller mass, and lower water content, making it easier to treat. For example, the dried sludge can be used as fertilizer or landfilled.

[0036] The solar drying module 272 includes a drying pipe 2722 and a conveying screw 2721. The drying pipe 2722 connects the wet sludge collection box 271 and the dry sludge collection box 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 box 271 to the dry sludge collection box 273. The sludge in the wet sludge collection box 271 enters the drying pipe 2722 and is gradually transported to the dry sludge collection box 273 by the conveying screw 2721 in the drying pipe 2722. During the conveying 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 box 273. Moreover, the squeezing process is a spiral movement path, which can be dried by the heat absorbed by the drying pipe 2722. Finally, the dried sludge arrives at the dry sludge collection box 273 and is collected for subsequent processing.

[0037] In this embodiment, several sets of solar drying components 272 are arranged in an array along an inclined straight path between the wet sludge collection box 271 and the dry sludge collection box 273. This inclined arrangement allows all sets of solar drying components 272 to receive sunlight with maximum heat-receiving area. A drive motor 2721a is installed at the end of one of the conveying screws 2721, and adjacent conveying screws 2721 are connected by a gear transmission pair 2721b. Meanwhile, the drying pipes 2722 and conveying screws 2721 of several sets of solar drying modules 272 extend into the wet sludge collection box 271. Each drying pipe 2722 is provided with a sludge inlet 2722a in the upper part for sludge to enter the drying pipe 2722, and a sewage outlet 2722b in the lower part for sewage discharge. The drying pipes 2722 are connected to each other by a partition 2722c. The partition 2722c can also be made of a mesh structure board to facilitate water filtration. The overall structure formed by connecting the drying pipes 2722 and the partition 2722c divides the wet sludge collection box 271 into two areas. The upper area is used to collect wet sludge, and the dividing structure has a filtration function. The lower area collects sewage. The drying tubes 2722 of the solar drying module 272 are inclined in the section between the two boxes, mainly to facilitate the absorption of more solar energy. In the wet sludge collection box 271, the inclined drying tubes 2722 form a dividing line of the inclined structure. On the one hand, by arranging them inclined, the number of solar drying modules 272 can be increased, thereby increasing the amount of sludge drying. On the other hand, the inclined dividing line formed by the inclined arrangement has a large filtration area, which can increase the amount of wet sludge filtration.

[0038] A liquid level float valve is installed at the bottom of the wet sludge collection tank 271 to discharge the sewage in the wet sludge collection tank 271 when the liquid level is close to the bottom solar drying component 272. The discharged sewage can be sent to the equalization tank 220 of the sewage treatment section 200 or other tanks for recycling.

[0039] After the sludge pump 251 delivers wastewater into the wet sludge collection tank 271, the sludge briefly remains in the upper region of the wet sludge collection tank 271 due to the inclined dividing line formed by the drying pipe 2722. The wastewater is filtered out through the wastewater outlet 2722b, ensuring a further decrease in the moisture content of the sludge remaining in the upper region. When the conveying screw 2721 is not activated, the wastewater in the wet sludge collection tank 271 will not flow towards the dry sludge collection tank 273 during the filtration process due to the sealing effect of the spiral structure and the blocking effect of the wet sludge. After a period of time, the conveying screw 2721 can be activated. The conveying screw 2721 moves the sludge located at one end of the wet sludge collection tank 271 in the drying pipe 2722 towards 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 begins to be collected by the solar-powered drying process. The conveying screw 2721 is connected to the drive motor 2721a. The drive motor 2721a is controlled intermittently, rotating a certain number of times and then pausing for a certain period of time to ensure that the sludge in the drying tube 2722 can fully absorb the heat of the drying tube 2722.

[0040] Reference Figure 8 The upper part of the drying pipe 2722 between the wet sludge collection box 271 and the dry sludge collection box 273 is also provided with a dehumidification trough 2722d arranged along the length of the drying pipe 2722. During the drying process, the moisture in the sludge is discharged through the dehumidification trough 2722d. The dehumidification trough 2722d is a square trough arranged along the length of the drying pipe 2722, and its width has a certain size. This size can ensure that the sludge will not block the dehumidification trough 2722d during the movement. The height of the dehumidification trough 2722d is designed to be slightly higher to prevent it from being squeezed out of the drying pipe 2722 during the squeezing process. Since the spiral conveying is intermittent, even if the sludge is squeezed into the dehumidification trough 2722d, it will fall back into the drying pipe 2722 due to gravity when it stops, thus avoiding overflow.

[0041] Reference Figure 9To further improve the drying efficiency of sludge in the drying pipe 2722, the conveying screw 2721 between the wet sludge collection box 271 and the dry sludge collection box 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 box 271, and the second conveying section 2721-2 is close to the dry sludge collection box 273. The conveying screw 2721 is equipped with a first spiral blade 2721c and a second spiral blade 2721d with different spiral radii. 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 in a cross pattern 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 has a spiral radius close to the inner wall radius of the drying pipe 2722, aiming to scrape away as much sludge as possible from the pipe wall. The first spiral blade 2721c has a spiral radius smaller than that of the second spiral blade 2721d, allowing the sludge at the location of the first spiral blade 2721c to be evenly spread on the inner wall of the pipe, resulting in good uniformity and improved drying effect. The radius difference is generally chosen to be between 0.5-1.0 cm; if the thickness is too thick, the drying efficiency is relatively low, and if 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, where the sludge has a higher moisture content, and the evenly spread sludge can move forward under the compression of subsequent sludge. However, on the second conveying section 2721-2, the sludge content is lower, and it is difficult to move the sludge forward under compression, so it is not suitable to arrange it on the second conveying section 2721-2.

[0042] Furthermore, on the first conveying section 2721-1, along the conveying direction, the number of first spiral blades 2721c spaced between the second spiral blades 2721d increases sequentially. For example, in a certain area, firstly, there is a first spiral blade 2721c of one complete spiral cycle; after a second spiral blade 2721d of one complete cycle, there are two first spiral blades 2721c of two complete spiral cycles; after another second spiral blade 2721d of one complete cycle, there are three first spiral blades 2721c of three complete spiral cycles. This creates sludge spreading areas of progressively increasing length on the first conveying section 2721-1. This structural design, on the one hand, ensures sufficient compression when the sludge needs to be moved, by creating an intermittent distribution in the ordinary areas; on the other hand, the gradual change in the ordinary areas addresses the issue of the strongest sunlight near the middle section and the tendency for shading at the ends in the early morning and late evening, thereby improving the sludge drying effect.

Claims

1. A solar-powered wastewater treatment device, comprising a solar power generation section and a wastewater treatment section, wherein the wastewater treatment section includes a sludge drying device for drying sludge, characterized in that, The sludge drying device includes: Wet sludge collection box, used to collect sludge after sedimentation treatment; Dry sludge collection box, used to collect sludge after drying treatment; A solar-powered drying assembly 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 inside the drying pipe and is used to transport the wet sludge in the wet sludge collection box to the dry sludge collection box. The solar drying module is provided in several groups, and the several groups of solar drying modules are arranged in an array along an inclined straight path between the wet sludge collection box and the dry sludge collection box; The drying pipes and conveying screws of the several sets of solar drying modules all extend into the wet sludge collection box. Each drying pipe is provided with a sludge inlet in the upper part for sludge to enter the drying pipe and a sewage outlet in the lower part for sewage discharge. The drying pipes are connected to each other by partitions, dividing the wet sludge collection box into two areas. The upper part of the drying pipe between the wet sludge collection box and the dry sludge collection box is also provided with a dehumidification trough arranged along the length of the drying pipe.

2. The solar-powered wastewater treatment equipment according to claim 1, characterized in that, The lower part of the wet sludge collection box is equipped with a liquid level float valve, which is used to drain the sewage in the wet sludge collection box when the liquid level is close to the bottom solar drying component.

3. The solar-powered wastewater 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 equipped with first and second helical blades with different helical radii. The helical radius of the first helical blade is smaller than that of the second helical blade. The first and second helical blades are arranged in a cross pattern on the first conveying section, and the second helical blades are arranged on the second conveying section.

4. The solar-powered wastewater treatment equipment according to claim 3, characterized in that, On the first conveying section, along the conveying direction, the number of first spiral blades spaced apart from the second spiral blades is arranged in an increasing order.

5. The solar-powered wastewater treatment equipment according to claim 1, characterized in that, One of the conveying screws is equipped with a drive motor at its end, and adjacent conveying screws are connected by a gear transmission pair.

6. The solar-powered wastewater treatment equipment according to claim 1, characterized in that, The solar power generation section includes photovoltaic modules, a controller, and a battery connected in sequence. The controller is also connected to an inverter, which is connected to the electrical load of the wastewater treatment section.

7. The solar-powered wastewater treatment equipment according to claim 1, characterized in that, The wastewater treatment section 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 wastewater. A screen channel is provided between the septic tank and the equalization tank. A wastewater pump is installed in the equalization tank to pump the wastewater from the equalization tank to the anaerobic tank. The anaerobic tank, aerobic tank, and sedimentation tank are connected in sequence. The upper layer of clear water in the sedimentation tank overflows into the clear water tank, and the bottom sludge is pumped to a sludge drying device by a sludge pump. A clear water pump is installed in the clear water tank to pump water to the water usage location.

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