Excrement treatment system and cabin

Abstract

The excrement treatment system comprises a septic tank, at least two sequentially adjacent partition plates are arranged in the septic tank at intervals so as to divide an inner cavity of the septic tank into at least a first septic cavity, a second septic cavity and a third septic cavity which are sequentially adjacent, overflow ports are formed in the partition plates in a penetrating mode so as to be communicated with the two adjacent septic cavities, and the overflow ports are communicated with the first septic cavity, the second septic cavity and the third septic cavity. A maintenance part is arranged at at least one septic cavity; the sewage treatment device is communicated with the last-stage septic cavity; the sediment pumping and discharging opening is formed in the bottom of the septic tank and is used for being externally connected with a sediment treatment device. According to the septic tank provided by the utility model, waste liquid can sequentially flow along the first septic cavity, the second septic cavity and the third septic cavity, and the flowing path of the waste liquid is increased to a certain extent, so that the solid-liquid separation degree can be improved, and the waste liquid can be better purified; through the arrangement, a user does not need to frequently and manually clean excrement in the black water tank, the excrement treatment efficiency is high, and the user experience is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to excrement treatment technical field especially, relate to a kind of excrement treatment system and cabin. BACKGROUND

[0002] The current popular movable cabin type building (for example space cabin type prefabricated house, board room or house car compartment), the structure of its toilet is that the excrement outlet of toilet is communicated with black water tank, black water tank is difficult to realize waste liquid solid-liquid separation, waste liquid treatment effect is poor, and user needs to clean excrement in black water tank frequently manually, and the efficiency of processing excrement is low, and user experience is poor. SUMMARY

[0003] In order to overcome at least one of the defects of the prior art described above, the utility model provides an excrement treatment system and cabin, comprising: a septic tank, at least two adjacent partitions are arranged in the septic tank, to divide the septic tank into at least first, second and third septic chambers in sequence, overflow ports are provided on each partition to communicate with adjacent two septic chambers; a sewage treatment device is connected to the last stage septic chamber; a sediment suction port is arranged at the bottom of the septic tank and is used to connect an external sediment treatment device.

[0004] In some embodiments, the overflow ports on adjacent two partitions are arranged in a staggered manner.

[0005] In some embodiments, at least one septic chamber is provided with an inspection part; the overflow port for communicating the first septic chamber with the second septic chamber and the overflow port for communicating the second septic chamber with the third septic chamber are arranged close to the inspection part.

[0006] In some embodiments, the inspection part includes at least one transparent / semi-transparent viewing window which can be detachably arranged.

[0007] In some embodiments, in the flow direction of fecal liquid, the overflow port on the downstream partition is lower than the overflow port on the upstream partition.

[0008] In some embodiments, the volume of the first septic chamber is greater than that of the second septic chamber; the volume of the second septic chamber is greater than or equal to that of the third septic chamber.

[0009] The utility model also provides a cabin in another aspect, which comprises the excrement treatment system described above, and further comprises: a body, the septic tank is arranged at the bottom of the body; at least one toilet is arranged in the body, and the excrement outlet of the toilet is connected to the excrement inlet of the first septic chamber.

[0010] In this way, by directly connecting the excrement outlet of the toilet bowl to the excrement inlet of the first septic tank, compared with the design that the excrement outlet of the toilet bowl is connected to the septic tank through a sloping sewage pipeline, the structure is simple, the production cost is reduced, and the structure is suitable for industrial production and use.Especially, in this way, the longitudinal space in the movable cabin type building (for example, a space cabin type prefabricated house, a board house or a carriage body) can be improved, so that the user can have a more comfortable experience when using the toilet, and the product competitiveness is enhanced.

[0011] The septic tank is arranged in the cabin body, the user does not need to manually clean frequently, the excrement treatment efficiency is effectively improved, the septic tank treatment equipment or the biogas tank is not needed, the cabin body is clean and sanitary, and the cabin body is suitable for practical use.

[0012] In some embodiments, the toilet bowl has a bent water outlet pipe connected to the excrement inlet of the first septic tank.

[0013] In some embodiments, a fresh air system arranged in the body is further included, and the fresh air system has an air outlet; a plurality of pressure relief holes are arranged on the top wall of each septic tank in a distributed manner, and the pressure relief holes are communicated with the air outlet.

[0014] In some embodiments, the fresh air system further includes: an air exchange device arranged above the toilet bowl; and a heat exchanger used for reducing heat loss in the air exchange process.

[0015] The septic tank is arranged in the cabin body, the user does not need to manually clean frequently, the excrement treatment efficiency is effectively improved, the septic tank treatment equipment or the biogas tank is not needed, the cabin body is clean and sanitary, and the cabin body is suitable for practical use.

[0016] In summary, the excrement treatment system and the cabin body have the following technical effects:

[0017] The septic tank at least includes the first septic tank, the second septic tank and the third septic tank, so that waste liquid can flow along the first septic tank, the second septic tank and the third septic tank in sequence, the flow path of the waste liquid is increased to a certain extent, the degree of solid-liquid separation is improved, and the waste liquid can be better purified and treated; in this way, the user does not need to manually clean the excrement in the black water tank frequently, the excrement treatment efficiency is high, and the user experience is improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 FIG. 1 is a structural schematic diagram of a cabin body according to the present application;

[0019] Figure 2 FIG. 3 is a sectional view of a toilet according to an embodiment of the present application;

[0020] Figure 3 FIG. 4 is a sectional view of a toilet according to another embodiment of the present application; Figure 2Structure diagram of a toilet, a septic tank and a sewage treatment device;

[0021] Figure 4 For Figure 3 Partial sectional view of the septic tank;

[0022] Figure 5 Structure diagram of a toilet and a sewage treatment device according to another embodiment of the present application;

[0023] Figure 6 For Figure 5 Structure diagram of the septic tank without a top cover;

[0024] Figure 7 Structure diagram of a fresh air system and a heat preservation system according to the present application.

[0025] In the drawings, the following notations are used:

[0026] 1, excrement treatment system; 2, septic tank; 21, first septic chamber; 211, dirt inlet; 22, second septic chamber; 23, third septic chamber; 24, fourth septic chamber; 25, pressure relief hole; 26, fecal liquid outlet; 31, first partition; 311, first overflow port; 32, second partition; 321, second overflow port; 33, third partition; 331, third overflow port; 4, maintenance part; 41, visual window; 5, sewage treatment device; 6, cabin body; 7, main body; 8, toilet; 81, dirt outlet; 82, bent water outlet pipe; 9, fresh air system; 10, heat preservation system; 102, second heat preservation unit; 103, third heat preservation unit; 104, fourth heat preservation unit. DETAILED DESCRIPTION

[0027] In order to better understand and implement, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0028] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present application and simplifying the description, and therefore cannot be understood as limiting the device or element indicated or implied to have a specific orientation, structure and operation, and therefore cannot be understood as limiting the present application.

[0029] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs. The terms used in the specification of the present application are only for the purpose of describing specific embodiments and are not intended to limit the present application.

[0030] Referring to Figures 2 to 6 The excrement treatment system 1 comprises: a septic tank 2, at least two sequentially adjacent partitions are arranged in the septic tank 2, so as to divide the inner cavity of the septic tank 2 into at least a first septic cavity 21, a second septic cavity 22 and a third septic cavity 23 which are sequentially adjacent, overflow ports are arranged through each partition, so as to communicate two adjacent septic cavities, and at least one septic cavity is provided with an inspection part 4; a sewage treatment device 5 which is communicated with the last stage septic cavity; and a sediment suction port which is arranged at the bottom of the septic tank 2 and is used for connecting an external sediment treatment device.

[0031] Referring to Figure 4 and Figure 6 The overflow ports on the two adjacent partitions are arranged in a staggered manner.

[0032] Preferably, through production practice, the excrement treatment efficiency of the four-stage septic tank 2 is high, the space occupation ratio is appropriate, and the production cost is moderate. Hereinafter, the four-stage septic tank 2 is taken as an example for description.

[0033] Specifically, the septic tank 2 is divided into the first septic cavity 21, the second septic cavity 22, the third septic cavity 23 and the fourth septic cavity 24 (i.e. the last stage septic cavity) which are sequentially adjacent by adopting three sequentially adjacent first partition 31, second partition 32 and third partition 33. The side wall of the first stage septic cavity is provided with a sewage inlet 211 for excrement to enter, and the side wall of the fourth stage septic cavity is provided with a fecal liquid outlet 26 for fecal liquid to flow out.

[0034] The first partition 31 is provided with a first overflow port 311 for the first septic cavity 21 and the second septic cavity 22 to communicate; the second partition 32 is provided with a second overflow port 321 for the second septic cavity 22 and the third septic cavity 23 to communicate; and the third partition 33 is provided with a third overflow port 331 for the third septic cavity 23 and the fourth septic cavity 24 to communicate. The number of the first overflow port 311, the second overflow port 321 and the third overflow port 331 is not limited, and the specific number is determined according to actual production requirements.

[0035] In the process, the excrement first enters the first septic cavity 21, and under the influence of gravity, most of the solids in the excrement will sink to the bottom of the septic cavity, and the liquid in the excrement will be relatively located in the upper part of the cavity, until it flows from the first overflow port 311 to the second septic cavity 22, and repeats the steps of solid deposition and liquid accumulation in the second septic cavity 22 until it flows to the next stage cavity.

[0036] The septic tank 2 can make waste liquid flow along the first septic cavity 21, the second septic cavity 22 and the third septic cavity 23 in sequence, increase the flow path of the waste liquid to a certain extent, and thus improve the solid-liquid separation degree, and facilitate better purification treatment of the waste liquid; in this way, it is not necessary for the user to frequently manually clean the excrement in the black water tank, the excrement treatment efficiency is high, and the user experience is improved.

[0037] Further, the overflow ports on two adjacent baffles in the septic tank 2 are arranged in a staggered manner, so that the excrement flow path is increased, the solid-liquid separation degree is increased, and the solid has more time to precipitate, thereby reducing the tendency of the solid to flow from the upper septic tank 2 to the lower septic tank 2. Preferably, the adjacent overflow ports are arranged at opposite ends of the cavity, so that the liquid flows along an "S" shaped route, and the solid-liquid separation degree of the excrement is maximized.

[0038] In the preferred embodiment, the overflow port is provided with an overflow pipe. The overflow pipe is sealingly arranged between the baffle, so as to prevent the liquid from flowing out of the gap between the two. One end of the overflow pipe extends towards the upper septic cavity so that the end of the overflow pipe is located below the liquid level of the upper septic cavity, thereby ensuring that the two adjacent septic cavities are connected through the overflow pipe.

[0039] In this way, the flow of solid matter to the lower septic cavity can be effectively prevented. For example, when the adjacent septic cavity overflow ports are arranged too close together, the overflow pipe can be arranged to avoid the situation that too much solid in the septic cavity causes the newly entered mixture to flow directly from the adjacent overflow ports with a short straight-line distance to the next septic cavity, thereby affecting the solid-liquid separation degree, and even causing the overflow port to be blocked due to insufficient solid-liquid separation.

[0040] Preferably, the overflow pipe can be an inverted "U" shaped bend pipe or an inverted half "U" shaped bend pipe.

[0041] In some embodiments, a filtering unit, such as a filter screen, is further arranged at the overflow port. The filter screen is a filter screen body with a flat square cavity assembled by a metal screen, which can be filled with a filtering medium or not. If filled, the filtering medium includes one or more of the following materials: gravel, volcanic rock, quartz sand, ceramic particles or charcoal.

[0042] It should be noted that not every overflow port needs to be provided with a filtering unit. For example, the filtering unit is not arranged at the first overflow port 311 and the second overflow port 321 as much as possible, because the solid-liquid separation degree of the excrement at the first overflow port 311 and the second overflow port 321 is not sufficient, and the filtering unit is likely to be blocked after being arranged, and needs to be cleaned and maintained frequently.

[0043] In the preferred technical solution, a filtering unit is arranged at the last overflow port and / or the septic tank 2 excrement outlet 26, which can effectively prevent solid matter from entering the sewage treatment device 5 with the liquid.

[0044] Please refer to Figure 4 and Figure 6 The overflow ports for connecting the first septic tank 21 and the second septic tank 22 and the overflow ports for connecting the second septic tank 22 and the third septic tank 23 are arranged close to the maintenance part 4.

[0045] At least one septic tank is provided with a maintenance part 4; the maintenance part 4 comprises at least one detachable transparent / semi-transparent visual window 41.

[0046] Preferably, the first overflow port 311 and the second overflow port 321 are arranged close to the at least one visual window 41, because the degree of solid-liquid separation of excrement at the first overflow port 311 and the second overflow port 321 is not sufficient enough, and they need to be cleaned and maintained frequently.

[0047] When there are multiple visual windows 41, the first overflow port 311 and the second overflow port 321 can be arranged close to the same visual window 41, or arranged close to one visual window 41 respectively. The former makes the two overflow ports share one visual window 41, simplifying the structure and reducing the cost. The latter enables the adjacent overflow ports to be arranged at opposite ends of the tank (i.e., the at least two visual windows 41 are arranged at opposite ends of the tank), so that the liquid flows along an "S" shaped route, maximizing the degree of solid-liquid separation of excrement.

[0048] In this embodiment, the maintenance part 4 is provided with three transparent visual windows 41: the first overflow port 311 and the second overflow port 321 are arranged close to the first maintenance window; the fourth overflow port is arranged close to the second maintenance window; and the excrement outlet 26 of the septic tank 2 is arranged close to the third maintenance window.

[0049] It should be noted that the bottom of each septic tank is also provided with a sediment pumping port for connecting a sediment pumping device, so as to periodically clean the solid sediments in the septic tank. In addition to observing and maintaining the overflow ports, each maintenance window can also be used to observe and maintain the sediment pumping port arranged at the bottom of each septic tank and the pipeline through which the sediment pumping device communicates with the sediment pumping port.

[0050] According to actual production and use, the toilets arranged in movable cabin type buildings (such as space cabin type prefabricated houses / cabins / carriage bodies) need to clean the solid sediments in the septic tanks once every 1-3 years if the toilets are arranged with one toilet bowl 8 for 1-3 people (such as Figure 2 and Figure 3 as shown); if the toilets are arranged with multiple toilet bowls 8 (such as Figure 5The solid deposits in each septic chamber need to be cleaned once every 3-8 months (as shown in the figure). Compared with the existing black water tank in the RV, the excrement in the present application is efficiently treated and cleaned less frequently, thereby improving the user experience and comfort.

[0051] The overflow port on the downstream baffle is lower than the overflow port on the upstream baffle (not shown in the figure) in the flow direction of the fecal liquid.

[0052] Further, the height of each septic chamber in the septic tank 2 is gradually reduced, i.e., the liquid level in the upper septic chamber is higher than that in the adjacent lower septic chamber. In this way, the liquid flowability is increased by the difference in liquid levels, which can effectively increase the liquid flow speed and thus improve the treatment speed and efficiency of the septic tank 2 for excrement.

[0053] Please refer to Figure 6 , the volume of the first septic chamber 21 is greater than that of the second septic chamber 22; the volume of the second septic chamber 22 is greater than or equal to that of the third septic chamber 23.

[0054] In the four-stage septic tank 2, the volume of the first septic chamber 21 is greater than that of the second septic chamber 22; the volume of the second septic chamber 22 is greater than or equal to that of the third septic chamber 23; the volume of the third septic chamber 23 is greater than or equal to that of the fourth septic chamber 24.

[0055] As can be easily understood, as the excrement enters each septic chamber through the overflow port, the solid matter gradually decreases. Therefore, the volume of each septic chamber is gradually reduced to maximize the actual demand and improve the space utilization.

[0056] It should be noted that, taking the first septic chamber 21 as an example, the solid matter accumulated and deposited in the first septic chamber 21 is the most in each septic chamber. Therefore, the volume of the first septic chamber 21 should be set to be able to accommodate the deposited solid matter and not to be too large to cause the liquid level to be below the overflow port. The volume of each septic chamber should also meet the above restrictions.

[0057] Please refer to Figure 1 , Figure 2 and Figure 5 In another aspect of the present application, a cabin body 6 is also disclosed, which comprises the excrement treatment system 1 described above, and further comprises: a body 7, the septic tank 2 is arranged at the bottom of the body 7; a toilet 8, at least one toilet 8 is arranged in the body 7, and the sewage outlet 81 of the toilet 8 is connected to the sewage inlet 211 of the first septic chamber 21.

[0058] In some embodiments, the sewage treatment device 5 connected to the last stage of the septic tank is arranged outside the cabin 6; in other embodiments, the sewage treatment device 5 is arranged below the ground of the body 7 inside the cabin 6; in preferred embodiments, the sewage treatment device 5 is arranged above the ground of the body 7 inside the cabin 6, as shown in Figure 2 and Figure 3 .

[0059] The utility model discloses a toilet 8 directly connected to the first septic tank 21 of the sewage outlet 81, compared with the design of the toilet 8 sewage outlet 81 connected to the septic tank 2 through the sewage pipeline with slope, the structure of the application is simple, the production cost is reduced, and it is suitable for industrial production. Especially, this arrangement can improve the longitudinal space in the movable cabin building (such as space cabin prefabricated house, board room or car body), thereby providing a more comfortable toilet experience for users and enhancing product competitiveness.

[0060] The cabin 6 of the utility model is built-in septic tank 2, which does not need to be cleaned manually frequently, effectively improves the excrement treatment efficiency, and is convenient to transport and use, without external septic tank 2 treatment equipment or biogas tank, clean and sanitary, and suitable for practical use.

[0061] For some areas where it is inconvenient to build a toilet, such as Qinghai-Tibet, mountainous areas, etc., the utility model can be assembled and transported to the local area for direct use, saving the need for high-precision installation process such as waterproofing and leakage prevention, convenient and easy to use, and suitable for industrial production and use.

[0062] For some water-deficient areas, the toilet 8 of the utility model can be a waterless toilet / squatting toilet 8, and a converter and a conveying pipe connected to the septic tank 2 are arranged.

[0063] For some areas with relatively perfect infrastructure, the toilet 8 of the utility model can be directly connected to the external sewage pipeline, so that the septic tank 2 and the sewage treatment device 5 are used as backup structures, or are directly simplified and removed, thereby reducing the cost.

[0064] In some embodiments, 1-2 toilets 8 are arranged in the movable cabin building for family use.

[0065] In other embodiments, a plurality of toilets 8 are arranged in the movable cabin building for use by unspecified people, i.e. as a public toilet.

[0066] Referring to Figure 2 , the toilet 8 has a bent drain pipe 82 connected to the sewage inlet 211 of the first septic tank 21.

[0067] Preferably, the water storage function of the elbow pipe is utilized to effectively prevent overflow and odor, and the bending direction of the elbow outflow pipe 82 can be connected to the septic tank 2 located obliquely below the toilet 8, so that the relative positions of the septic tank 2 and the toilet 8 can have more possibilities, rather than being limited to the design scheme of arranging the septic tank 2 directly below the toilet 8.

[0068] The elbow outflow pipe 82 can be a front elbow outflow pipe and a rear elbow outflow pipe, and the specific selection is determined according to the actual design requirements of the cabin 6.

[0069] Referring to Figure 1 and Figure 7 , the fresh air system 9 arranged in the body 7 is further included, and the fresh air system 9 has an air outlet; a plurality of pressure relief holes 25 are arranged on the top wall of each stage of the septic tank, and the pressure relief holes 25 are connected to the air outlet.

[0070] The arrangement of the fresh air system 9 can automatically exhaust the odor in the septic tank 2, avoid odor pollution, and improve the user's comfort. This design can also prevent the explosion of the septic tank 2 and ensure the safety of the product.

[0071] Referring to Figure 7 , the fresh air system 9 further includes: an air exchange device arranged above the toilet 8; and a heat exchanger for reducing heat loss in the air exchange process.

[0072] Further, the air exchange device such as an air exchange fan is arranged above the toilet 8, which can filter outdoor fresh air and send it into the room; the heat exchanger is arranged to reduce heat loss in the air exchange process, reduce the energy consumption of air conditioning and heating, and also adjust the indoor humidity to prevent excessive dryness or humidity and improve the user's comfort. This arrangement can effectively improve the compatibility of the cabin 6, so that the cabin 6 can be applied in some extremely cold or hot areas, and the fresh air system 9 can maintain the temperature difference between indoor and outdoor, and reduce the temperature difference while keeping warm.

[0073] Referring to Figure 7 , further, the cabin 6 further includes a heat preservation system 10, and the heat preservation system 10 includes: a first heat preservation unit (not shown in the figure) arranged to cover the water supply pipe; a second heat preservation unit 102 arranged to cover the body 7; a third heat preservation unit 103 for keeping warm in the cabin 6; and a fourth heat preservation unit 104 arranged on the ground in the body 7.

[0074] Preferably, the first heat preservation unit is a water supply pipe electric heating wire protection structure; the second heat preservation unit 102 is a thickened polyurethane (PU) heat preservation layer arranged to cover the body 7; the third heat preservation unit 103 includes an air conditioner arranged in the cabin 6 and a warm air equipment installed on the top of the toilet or a bathroom heater with lighting function; and the fourth heat preservation unit 104 is an electric heating floor heating.

[0075] The heat preservation system 10 and the fresh air system 9 jointly act, the heat preservation performance of the cabin body 6 is greatly strengthened, so that the indoor and outdoor temperature difference is maintained on the basis of guaranteeing the fresh and clean air in the room, and the compatibility of the cabin body 6 and user comfort are improved.

[0076] The technical means disclosed by the utility model scheme is not only limited to the technical means disclosed by the above-mentioned implementation mode, but also includes the technical scheme composed of any combination of the above technical features. It should be pointed out that, for ordinary skilled persons in the art, without departing from the principle of the utility model, a number of improvements and refinements can be made, and these improvements and refinements are also considered to be within the protection scope of the utility model.

Claims

1. An excreta disposal system (1), characterized in that, The application relates to a fecal matter treatment system (1) comprising: a septic tank (2) having at least two sequentially adjacent partitions arranged at intervals in the septic tank (2) to divide the inner cavity of the septic tank (2) into at least a first septic cavity (21), a second septic cavity (22) and a third septic cavity (23) sequentially adjacent to each other, and a filter unit arranged at an overflow port penetrating through each of the partitions to communicate two adjacent septic cavities, and a sewage treatment device (5) connected to the last-stage septic cavity, a sludge suction port arranged at the bottom of the septic tank (2) and connected to a sludge treatment device.

2. The excreta disposal system (1) according to claim 1, characterized in that, The overflow ports on two adjacent partitions are arranged in a staggered manner.

3. The excreta disposal system (1) according to claim 2, characterized in that, At least one of the septic cavities is provided with a maintenance part (4). The overflow port for connecting the first septic cavity (21) and the second septic cavity (22) and the overflow port for connecting the second septic cavity (22) and the third septic cavity (23) are arranged close to the maintenance part (4).

4. The excreta disposal system (1) according to claim 3, characterized in that The maintenance part (4) comprises at least one transparent / semi-transparent visual window (41) arranged in a detachable manner.

5. The waste management system (1 ) according to any one of claims 1 -4, characterized in that, In the flow direction of fecal liquid, the overflow port on the downstream partition is lower than the overflow port on the upstream partition.

6. The excreta handling system (1) according to claim 5, characterized in that, The volume of the first septic cavity (21) is greater than that of the second septic cavity (22). The volume of the second septic cavity (22) is greater than or equal to that of the third septic cavity (23).

7. A tank (6) characterized in that The application further relates to a fecal matter treatment system (1) as claimed in any one of claims 1-6, further comprising: a body (7), wherein the septic tank (2) is arranged at the bottom of the body (7); a toilet (8), wherein at least one of the toilets (8) is arranged in the body (7), and a sewage outlet (81) of the toilet (8) is connected to a sewage inlet (211) of the first septic cavity (21).

8. A capsule (6) according to claim 7, characterized in that The toilet (8) has a bent water outlet pipe (82) connected to the sewage inlet (211) of the first septic cavity (21).

9. A capsule (6) according to claim 7 or 8, characterized in that The application further relates to a fecal matter treatment system (1) as claimed in any one of claims 1-6, further comprising: a fresh air system (9) arranged in the body (7), wherein the fresh air system (9) has an exhaust port; 10. A capsule (6) according to claim 9, characterized in that a plurality of pressure relief holes (25) arranged at the top wall of each septic cavity, and the pressure relief holes (25) are connected to the exhaust port. The fresh air system (9) further comprises: an air exchange device arranged above the toilet (8); a heat exchanger for reducing heat loss during air exchange.

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