Buried septic tank exhaust gas biological treatment box

Abstract

The utility model discloses a kind of buried septic tank waste gas biological treatment box, by box, porous baffle, biological filler, sewage pump and monitoring device composition, the box is by air inlet, exhaust port and access hole composition, sewage pump is arranged at the bottom of box, its output end is extended upwards along box side wall through drain pipe, with the internal sealing butt joint of the leachate exhaust port, the air inlet is coaxially butted with septic tank waste gas source pipeline through flange, the box is buried below ground permafrost, the monitoring device is composed of sensor and monitoring module. The utility model provides the low-cost processing method mainly with biological treatment for waste gas generated by rural large-scale centralized septic tank or discharged by sewage vacuum drainage system, is conducive to reducing air pollution caused by toilet septic tank waste gas, improve rural living environment.

Description

Technical Field

[0001] This utility model relates to the field of rural toilet renovation and sewage treatment. Specifically, it is a septic tank exhaust gas treatment device that generates or discharges waste gas from large-scale centralized septic tanks in rural areas or from sewage vacuum drainage systems. Background Technology

[0002] Large centralized septic tanks in rural areas generate a large amount of foul odor every day, and the current treatment rate is low. The vacuum pump exhaust port of the sewage vacuum drainage system also discharges a large amount of septic tank exhaust gas. The treatment of this septic tank exhaust gas is mostly done with industrial waste gas treatment equipment or brick-built biological filter tanks, which not only have high construction and operation costs, but also have unsatisfactory treatment effects in cold regions. Utility Model Content

[0003] The purpose of this invention is to provide a coupled low-temperature vacuum suction valve that can be used in outdoor vacuum drainage systems in cold, especially high-altitude, regions, thereby solving the aforementioned problems in the prior art.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: a buried septic tank exhaust gas biological treatment box, characterized in that it includes: a buried box body, a porous partition, biological packing material, a sewage pump and a monitoring device; The underground enclosure is integrally connected from top to bottom by a lower leachate storage layer, a middle exhaust gas treatment layer, and an upper inspection well. The height of the inspection well is coordinated with the thickness of the permafrost layer. The lower side wall of the underground enclosure is provided with an air inlet, the upper side wall is provided with an exhaust outlet, and the lower side wall is provided with a leachate discharge outlet. The top of the upper inspection well is provided with a maintenance port. The air inlet is coaxially connected to the septic tank exhaust gas source pipeline through a flange. The middle exhaust gas treatment layer is located below the ground permafrost layer. The inspection well extends upward to above the ground. The top maintenance port of the inspection well is fixed with a sealed manhole cover. The central axis of the exhaust outlet is located above the upper surface of the biological filter layer. The exhaust outlet is vertically connected to one end of the exhaust pipe through a flange. The exhaust pipe extends vertically upward to above the ground, and its upper opening is connected to the atmosphere. The porous partition is horizontally fixed between the air inlet and the exhaust outlet, and is located at the junction of the bottom leachate storage layer and the middle exhaust gas treatment layer. The edge of the porous partition is fixed to the inner wall of the buried box by bolts or clips. The biological packing material is evenly laid on the upper surface of the porous partition to form a biological filter layer; the sewage pump is fixedly installed at the bottom of the leachate storage layer in the lower part of the underground tank, and its output end extends upward along the side wall of the tank through a drain pipe and is sealed and connected to the inside of the leachate discharge outlet. The monitoring device consists of sensors and a monitoring module. The waste liquid level sensor at the bottom of the tank is vertically embedded in the bottom leachate storage layer. There is at least one biological filter material moisture content sensor, which is set inside the biological filter layer. The monitoring module is fixedly installed on the inner wall of the inspection well or above the ground. The monitoring module is connected to the sensors and the sewage pump respectively through wires.

[0005] Furthermore, an intake fan is coaxially installed inside the pipe of the air inlet, with the central axis of the intake fan coinciding with the central axis of the air inlet. The intake fan extends upward along the inner wall of the buried box via a wire and is electrically connected to the monitoring module.

[0006] Furthermore, the biofilter layer also includes a microbial liquid spraying device. The microbial liquid tank is fixedly installed on the inner wall of the inspection well. The spraying pipeline extends downward along the inner wall of the inspection well to the top of the middle waste gas treatment layer and is arranged in a horizontal ring above the biofilter layer. The spraying heads are evenly distributed on the ring spraying pipeline, and the spraying direction of the spraying heads is vertically downward toward the biological packing material.

[0007] Furthermore, an auxiliary waste gas treatment device is connected in series between the exhaust port and the exhaust pipe. The auxiliary waste gas treatment device is fixed on the inner wall of the box inside the exhaust port. Its outlet end is fixedly connected to the exhaust port, and its inlet end is connected to the internal space of the box above the biological packing. The auxiliary waste gas treatment device adopts an activated carbon treatment device and a photo-oxidation tube treatment device. The ultraviolet lamps of the photo-oxidation tube treatment device are evenly arranged along the internal axis of the device and are electrically connected to the monitoring module through wires.

[0008] Furthermore, the outer wall of the upper inspection well within the permafrost layer is fully covered with an insulation layer, and the inner surface of the insulation layer is tightly bonded to the outer wall of the buried box; the inner wall of the middle exhaust gas treatment layer is fully coated with an anti-corrosion coating, which is tightly bonded to the inner wall.

[0009] Furthermore, the exhaust gas concentration sensor is fixedly installed inside the exhaust port, with its detection end located at the central axis of the exhaust port; the wireless communication module is integrated inside the monitoring module, and the local alarm device is fixedly installed on the inner wall of the inspection well, with the audible and visual transmitter of the alarm device facing the inspection port.

[0010] The working principle of this utility model is as follows: Under the natural pressure difference formed by the height difference between the exhaust pipe and the air inlet, or under the mechanical forced power generated by the air intake fan, the septic tank exhaust gas enters the bottom of the biological filter layer in the box from the air inlet, then passes through the gaps in the biological filter material and is discharged upward from the exhaust port. The biological packing material in the biological filter layer has the functions of "microbial attachment", "gas flow" and "moisture retention". Through the metabolic action of the microorganisms on its surface, the pollutants in the exhaust gas are converted into harmless inorganic substances (such as CO2, H2O, N2, etc.), thereby purifying the exhaust gas.

[0011] The beneficial effects of this utility model are as follows: This utility model boasts high purification efficiency and meets emission standards. It employs a two-stage process of "biodegradation + auxiliary purification," utilizing a large specific surface area of ​​the biological packing material, ensuring sufficient waste gas residence time, and achieving a pollutant removal rate of ≥90%. The integrated structural design simplifies installation; the inspection well extends above ground, and the addition of a grating cover and ladder facilitates routine maintenance and component replacement. A wireless communication module enables remote monitoring, reducing the frequency of on-site inspections. This provides a low-cost biological treatment device for waste gas generated by large centralized septic tanks in rural areas or discharged from sewage vacuum drainage systems, helping to reduce air pollution caused by septic tank waste gas and improve the rural living environment. Attached Figure Description

[0012] Figure 1 This is a schematic diagram of a buried septic tank waste gas biological treatment box; In the diagram: 1. Box body; 2. Porous partition; 3. Biological packing material; 4. Sewage pump; 5. Air inlet; 6. Exhaust outlet; 7. Inspection well; 8. Leachate discharge outlet; 9. Air intake fan; 10. Sealed manhole cover; 11. Exhaust pipe; 12. Monitoring module; 13. Liquid level sensor; 14. Moisture content sensor; 15. Microbial liquid tank; 16. Spray head; 17. Waste gas auxiliary treatment device; 18. Ground line. Detailed Implementation

[0013] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the scope of the present utility model.

[0014] like Figure 1 As shown, the underground enclosure 1 of this utility model is integrally composed of a bottom leachate storage layer, a middle exhaust gas treatment layer, and an upper inspection well 7, connected from top to bottom. The entire structure is manufactured using a one-piece molding process to ensure structural sealing and stability. The height of the upper inspection well 7 is coordinated with the thickness of the permafrost layer in the installation area to avoid the impact of low winter temperatures on equipment operation. The middle exhaust gas treatment layer is located below the ground permafrost layer to ensure a stable working temperature environment for the biofilter layer. The upper inspection well 7 extends upwards above the ground for easy equipment inspection and maintenance.

[0015] The buried enclosure 1 has an air inlet 5 on the lower side wall, an exhaust outlet 6 on the upper side wall, and a leachate outlet 8 at the bottom corner. An inspection port is located at the top of the inspection well 7. The air inlet 5 is coaxially connected to the septic tank exhaust gas source pipeline via a flange to ensure the airtightness of the exhaust gas transmission. The central axis of the exhaust outlet 6 is located above the upper surface of the biological filter layer. The exhaust outlet 6 is vertically connected to one end of the exhaust pipe 11 via a flange. The exhaust pipe 11 extends vertically upwards above the ground, with its upper opening open to the atmosphere, ensuring the smooth discharge of purified gas. A sealed manhole cover 10 is fixed to the top of the inspection well 7 to prevent rainwater and debris from entering the enclosure and to ensure the safety of equipment operation.

[0016] The outer wall of the underground enclosure 1 is fully covered with an insulation layer, and the inner surface of the insulation layer is tightly bonded to the outer wall of the underground enclosure 1 to provide thermal insulation. An HDPE anti-corrosion film is wrapped around the outer surface of the insulation layer, and its edges are heat-sealed to prevent moisture in the soil from eroding the insulation layer. The inner wall of the middle exhaust gas treatment layer is fully coated with an anti-corrosion coating, which is tightly bonded to the inner wall to enhance the enclosure's resistance to corrosive substances in the exhaust gas and extend the service life of the equipment.

[0017] A removable grating cover is horizontally installed at the inspection port. The lower surface of the grating cover is flush with the edge of the inspection port, serving both protective and ventilation functions. A ladder is symmetrically fixedly installed along the inner wall of inspection well 7. The ladder's steps are horizontally set, the top of the ladder is flush with the edge of the inspection port, and the bottom extends to the upper surface of the biofilter layer, providing a safe passage for maintenance personnel to go up and down.

[0018] The porous baffle 2 is horizontally fixed between the air inlet 5 and the exhaust outlet 6, and is located at the junction of the bottom leachate storage layer and the middle exhaust gas treatment layer. The edge of the porous baffle 2 is sealed and fixed to the inner wall of the buried tank 1 with bolts to achieve isolation between the leachate storage layer and the exhaust gas treatment layer. The porous baffle 2 is made of corrosion-resistant and high-strength material, and its surface has uniformly distributed through holes, which not only ensures that the exhaust gas can pass smoothly into the biological filter layer, but also effectively supports the weight of the biological packing 3.

[0019] Biological packing material 3: It is evenly laid on the upper surface of the porous partition 2 to form a biological filter layer. The biological packing material 3 is made of porous material with high specific surface area, good air permeability and moisture retention. It has three core functions: "microbial attachment", "gas circulation" and "moisture retention", providing a stable carrier for the growth and reproduction of microorganisms.

[0020] Sewage pump 4: Fixedly installed in the corner of the leachate storage layer at the bottom of the underground tank 1. Its output end extends upward along the side wall of the tank 1 through a drain pipe and is sealed to the inside of the leachate discharge outlet 8. Sewage pump 4 is used to promptly discharge the leachate collected in the bottom leachate storage layer to prevent leachate accumulation from affecting the normal operation of the biofilter layer.

[0021] Intake fan 9: Installed inside the duct of intake port 5, coinciding with the central axis of intake port 5. Intake fan 9 extends upward along the inner wall of the buried box 1 via a wire and is electrically connected to monitoring module 12. Intake fan 9 can provide mechanical forced power. When the natural pressure difference is insufficient, it is started by control of monitoring module 12 to ensure that the exhaust gas enters the treatment box stably.

[0022] The biological liquid spraying device includes a microbial liquid tank 15, spraying pipes, and spray heads 16. The microbial liquid tank 15 is fixedly installed on the inner wall of the inspection well 7. The spraying pipes extend downwards along the inner wall of the inspection well 7 to the top of the central waste gas treatment layer, forming a horizontal ring above the biofilter layer. The spray heads 16 are evenly distributed along the ring-shaped spraying pipes, spraying vertically downwards towards the biological packing material 3. This device can periodically spray microbial nutrient solution and humectant onto the biofilter layer to maintain microbial activity and stabilize the moisture content of the biofilter layer.

[0023] The waste gas auxiliary treatment device 17 is connected in series between the exhaust port 6 and the exhaust pipe 11, and is coaxially connected to the exhaust port 6 and the exhaust pipe 11 via a flange, with its central axis coinciding with the central axis of the exhaust port 6. The waste gas auxiliary treatment device 17 can be an activated carbon treatment device or a photo-oxidation tube treatment device. In the photo-oxidation tube treatment device, the ultraviolet lamps are evenly arranged along the internal axis of the device and electrically connected to the monitoring module 12 via wires extending downwards along the inner wall of the exhaust pipe 11. This device performs secondary purification on the waste gas after biological treatment, further improving the waste gas purification effect.

[0024] The sensors include: a waste liquid level sensor 13 at the bottom of the chamber, a biological filter media moisture content sensor 14, and an exhaust gas concentration sensor. The level sensor 13 is vertically embedded in the bottom leachate storage layer to monitor the leachate level; 3-5 moisture content sensors 14 are evenly arranged along the thickness direction of the biological filter layer, embedded in the upper, middle, and lower parts of the biological filter layer respectively, to comprehensively monitor the moisture content of the biological filter layer; the exhaust gas concentration sensor is fixedly installed inside the exhaust port 6, with its detection end located at the central axis of the exhaust port 6, to monitor the pollutant concentration of the purified exhaust gas.

[0025] The monitoring module 12 is fixedly installed on the inner wall of the inspection well 7. It integrates a wireless communication module and is electrically connected to each sensor, sewage pump 4, air intake fan 9, microbial liquid spraying device, and waste gas auxiliary treatment device 17 via wires. A local alarm device is also fixedly installed on the inner wall of the inspection well 7, with its audible and visual transmitter facing the maintenance opening. When abnormal parameters are detected, it promptly issues an audible and visual alarm signal and sends alarm information to the remote monitoring platform via the wireless communication module.

[0026] The biological filler is a composite porous carrier type filler, which is made by mixing a basic carrier and functional additives in a weight ratio of 90:10: 1. Basic carrier (accounting for 90%), which is made by mixing coconut shell activated carbon (40%), ceramsite (30%), and volcanic rock particles (20%); wherein, the coconut shell activated carbon has a particle size of 3-5mm (specific surface area ≥1000m² / g), the ceramsite has a particle size of 4-6mm (porosity ≥50%), and the volcanic rock particles have a particle size of 3-5mm (surface roughness Ra≥1.2μm). The three are mixed to form a multi-level porous structure for microbial attachment and colonization.

[0027] Functional additives (10%) include microbial immobilization carrier (5%, modified starch-acrylamide copolymer), slow-release nutrient salt (3%, nitrogen-phosphorus-potassium complex salt, N:P:K=10:3:2), and preservative agent (2%, nano titanium dioxide), which are uniformly dispersed in the gaps of the base carrier to promote microbial proliferation and extend the service life of the filler.

[0028] Structural form: The biological packing material is an irregular granular material with a bulk density of 600-800 kg / m³ and a laying thickness of 300-500 mm (covering the entire surface of the porous partition). The porosity of the packing layer is ≥65%, ensuring that the exhaust gas can penetrate evenly and the leachate can seep smoothly into the leachate storage layer.

[0029] Sensor selection and installation for this utility model: Liquid level sensor 13: An immersion hydrostatic level gauge (measuring range 0-50cm, output signal 4-20mA) is selected and vertically embedded in the bottom leachate storage layer (10cm from the bottom of the tank). The probe is in direct contact with the leachate and is used to monitor the leachate level. Biological filter media moisture content sensor 14: Select a frequency domain reflectance sensor (measurement range 0-100%, output signal RS485), and evenly arrange 3-5 sensors along the thickness direction of the biological filter layer (for example, when there are 3 sensors, they are located at the upper 1 / 3, middle 1 / 3, and lower 1 / 3 of the filter layer respectively), with an embedding depth ≥5cm, to comprehensively monitor the moisture content of the filter layer; Exhaust gas concentration sensor 15: An electrochemical sensor (measurement range 0-100ppm, response time ≤10s) is selected and fixedly installed inside the exhaust port 6 (10-15cm from the flange). The detection end is located at the central axis of the exhaust port 6 and is used to monitor the concentration of characteristic pollutants such as hydrogen sulfide and ammonia in the purified exhaust gas.

[0030] The monitoring module 12 collects parameters such as leachate level, biofilter moisture content, and exhaust gas concentration in real time and uploads them to a remote platform via a wireless communication module. When the filter moisture content is ≤40%, the microbial liquid spraying device is automatically activated, spraying for 5-10 minutes (5-10L per spray) to maintain the moisture content at 50%-70%. When the exhaust gas concentration is ≥50ppm, the exhaust gas auxiliary treatment device 17 is automatically activated until the concentration is ≤30ppm. Local alarms and remote warnings are triggered when parameters are abnormal to ensure stable equipment operation.

[0031] The operation mode of this utility model is as follows: Start-up operation: After the equipment is installed and debugged, it can be selected to operate in natural pressure difference mode or mechanical forced operation mode. In natural pressure difference mode, the exhaust gas is guided to flow naturally by the pressure difference formed by the height difference between the exhaust pipe 11 and the air inlet 5; when the exhaust gas emission is large or the natural pressure difference is insufficient, the intake fan 9 is started through the monitoring module 12 to force the exhaust gas into the treatment box.

[0032] Parameter monitoring: The monitoring module 12 collects parameters such as leachate level, biofilter layer moisture content, and exhaust gas concentration in real time, and uploads them to the remote monitoring platform via the wireless communication module. When the leachate level reaches the set upper limit, the monitoring module 12 automatically starts the sewage pump 4 and stops automatically after discharging to the lower limit of the liquid level. When the biofilter layer moisture content is lower than 50%, the microbial liquid spraying device is automatically started. The spraying time is set to 5-10 minutes according to the moisture content to maintain the moisture content between 50% and 70%.

[0033] Auxiliary purification control: When the exhaust gas concentration sensor detects that the exhaust gas concentration at the exhaust port is close to the emission standard limit, the monitoring module 12 automatically starts the auxiliary exhaust gas treatment device 17 (activated carbon treatment device or photo-oxidation tube treatment device) for secondary purification; when the photo-oxidation tube treatment device is running, the ultraviolet lamp is activated to decompose residual pollutants through photocatalysis.

[0034] By adopting the above-mentioned technical solution disclosed in this utility model, the following beneficial effects are obtained: a low-cost treatment method based on biological treatment is provided for the exhaust gas generated by large-scale centralized septic tanks in rural areas or discharged by sewage vacuum drainage systems, which helps to reduce air pollution caused by exhaust gas from toilet septic tanks and improve the rural living environment.

[0035] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A buried septic tank waste gas biological treatment box, characterized in that: include: Buried enclosure, porous partition, biological packing material, sewage pump and monitoring device; The underground enclosure is integrally connected from top to bottom by a bottom leachate storage layer, a lower leachate storage layer, a middle exhaust gas treatment layer, and an upper inspection well. The height of the inspection well is coordinated with the thickness of the frozen soil layer. The lower side wall of the underground enclosure is provided with an air inlet, the upper side wall is provided with an exhaust outlet, and the lower side wall is provided with a leachate discharge outlet. The top of the upper inspection well is provided with a maintenance port. The air inlet is coaxially connected to the septic tank exhaust gas source pipeline through a flange. The middle exhaust gas treatment layer is located below the ground frozen soil layer. The inspection well extends upward to above the ground. The top maintenance port of the inspection well is fixed with a sealed manhole cover. The central axis of the exhaust outlet is located above the upper surface of the biological filter layer. The exhaust outlet is vertically connected to one end of the exhaust pipe through a flange. The exhaust pipe extends vertically upward to above the ground, and its upper opening is connected to the atmosphere. The porous partition is horizontally fixed between the air inlet and the exhaust outlet, and is located at the junction of the bottom leachate storage layer and the middle exhaust gas treatment layer. The edge of the porous partition is fixed to the inner wall of the buried box by bolts or clips. The biological packing material is evenly laid on the upper surface of the porous partition to form a biological filter layer; the sewage pump is fixedly installed at the bottom of the leachate storage layer in the lower part of the underground tank, and its output end extends upward along the side wall of the tank through a drain pipe and is sealed and connected to the inside of the leachate discharge outlet. The monitoring device consists of sensors and a monitoring module. The waste liquid level sensor at the bottom of the tank is vertically embedded in the bottom leachate storage layer. It also includes a biological filter media moisture content sensor, at least one of which is installed inside the biological filter layer. The monitoring module is fixedly installed on the inner wall of the inspection well or above the ground. The monitoring module is connected to the sensors and the sewage pump respectively through wires.

2. The underground septic tank waste gas biological treatment box according to claim 1, characterized in that: An intake fan is coaxially installed inside the pipe of the air inlet. The central axis of the intake fan coincides with the central axis of the air inlet. The intake fan extends upward along the inner wall of the buried box through a wire and is electrically connected to the monitoring module.

3. The underground septic tank waste gas biological treatment box according to claim 1, characterized in that: The biofilter layer also includes a microbial liquid spraying device, comprising a microbial liquid tank, a spraying pipeline, and spray heads. The microbial liquid tank is fixedly installed on the inner wall of the inspection well. The spraying pipeline extends downward along the inner wall of the inspection well to the top of the middle waste gas treatment layer and is arranged in a horizontal ring above the biofilter layer. The spray heads are evenly distributed on the ring spraying pipeline, and the spraying direction of the spray heads is vertically downward toward the biological packing material.

4. The underground septic tank waste gas biological treatment box according to claim 1, characterized in that: An auxiliary waste gas treatment device is connected in series between the exhaust port and the exhaust pipe. The auxiliary waste gas treatment device is fixed on the inner wall of the box inside the exhaust port. Its outlet end is fixedly connected to the exhaust port, and its inlet end is connected to the internal space of the box above the biological packing. The auxiliary waste gas treatment device adopts an activated carbon treatment device and a photo-oxidation tube treatment device. The ultraviolet lamps of the photo-oxidation tube treatment device are evenly arranged along the internal axis of the device and are electrically connected to the monitoring module through wires.

5. The underground septic tank waste gas biological treatment box according to claim 1, characterized in that: The upper inspection well of the enclosure is fully covered with an insulation layer on its outer wall, which is located within the permafrost layer. The inner surface of the insulation layer is tightly bonded to the outer wall of the buried enclosure. The inner wall of the middle exhaust gas treatment layer is fully coated with an anti-corrosion coating that is tightly bonded to the inner wall.

6. The underground septic tank waste gas biological treatment box according to claim 1, characterized in that: It also includes an exhaust gas concentration sensor, a wireless communication module, and a local alarm device. The exhaust gas concentration sensor is fixedly installed inside the exhaust port, with its detection end located at the central axis of the exhaust port. The wireless communication module is integrated inside the monitoring module. The local alarm device is fixedly installed on the inner wall of the inspection well, with the sound and light emitting end of the alarm device facing the inspection port.

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