Vehicle-mounted sewage treatment system for railway passenger train

Abstract

The utility model relates to a railway passenger train vehicle-mounted sewage treatment system, which comprises a vacuum pumping drainage system, a sewage treatment system and a control system, the sewage treatment system comprises a sewage tank, a primary filter, a booster pump and a reverse osmosis processor, the sewage tank is arranged at the bottom of a train carriage, and an electric heating sheet and a temperature sensor are arranged at the bottom of the sewage tank. The outer layer of the sewage tank is sequentially coated with a rubber thermal insulation layer and a shell, the top of the sewage tank is respectively provided with a sewage inlet and a sewage suction port, the side surface of the sewage tank is provided with an overflow port and a water outlet, the water outlet is sequentially connected with a primary filter, a booster pump and a reverse osmosis processor, a replaceable filter element is arranged in the primary filter, and a replaceable reverse osmosis membrane is arranged in the reverse osmosis processor. According to the utility model, the sewage generated in the train toilet can be treated in time on the train and discharged up to the standard or recycled to flush the toilet, so that the daily sewage discharge operation of the train is avoided, and only clear water is required to be supplemented, chemicals are added, and the filter element and the reverse osmosis membrane are required to be replaced daily.

Description

Technical Field

[0001] The utility model relates to the technical field of railway passenger train equipment, in particular to a railway passenger train onboard sewage treatment system. Background Art

[0002] Railway passenger trains are the main means of transportation for Chinese people to travel long distances. From the ordinary 25 series to the CRH series of EMUs, and then to the high-speed rail 380 series, Harmony, and Fuxing, the on-board toilets have also been upgraded from direct discharge to vacuum collection. Needless to say, as we all know, the direct discharge type is discharged along the way, polluting the environment; the vacuum collection type uses vacuum suction to suck the sewage in the toilet into the on-board sewage tank installed at the bottom of the carriage. When the sewage tank is full, it is discharged at the station through an online sewage discharge system or a sewage suction truck. The vacuum collection type solves the problem of environmental pollution. At present, most passenger trains in my country use this method. For trains equipped with vacuum toilets, except for the later-produced high-speed rail 380 series, Harmony, and Fuxing, which have online sewage discharge systems at some stations or maintenance workshops, the 25 series and CRH series trains generally use sewage suction trucks at stations to discharge sewage. Compared with the online sewage discharge system, the train stop time is significantly extended when the train discharges sewage at the station through the sewage suction truck. In addition, adding an online sewage discharge system to the original station is not only difficult to build, but also too costly. In addition, due to the large number of trains and stations in my country, the number of sewage discharge operators required is large, and the sewage discharge operation is not only labor-intensive, but also has a harsh working environment. The sewage collected by the sewage discharge needs to be treated at the nearest sewage treatment station to meet the standards before it can be discharged. Summary of the invention

[0003] The utility model aims to provide a railway passenger train onboard sewage treatment system which does not require the train to discharge sewage every day and can directly treat the onboard toilet sewage to meet the discharge standards or reuse it for flushing toilets.

[0004] The utility model is realized by adopting the following technical scheme: a railway passenger train onboard sewage treatment system, including a vacuum pumping system, a sewage treatment system and a control system, the sewage treatment system including a sewage tank, a primary filter, a booster pump and a reverse osmosis processor, the sewage tank is arranged at the bottom of the train compartment, an electric heating plate and a temperature sensor are arranged at the bottom of the sewage tank, the outer layer of the sewage tank is sequentially covered with a rubber-plastic insulation layer and an outer shell, the top of the sewage tank is respectively provided with a sewage inlet and a sewage suction port, an overflow port and a water outlet are arranged on the side, the water outlet is sequentially connected to the primary filter, the booster pump and the reverse osmosis processor, the primary filter has a built-in replaceable filter element, and the reverse osmosis processor has a built-in replaceable reverse osmosis membrane.

[0005] Furthermore, the sewage tank is made of welded steel plates, is hollow, and the inner cavity is divided into an anaerobic bin, an aerobic bin 1, an anaerobic bin, an aerobic bin 2, a sedimentation bin and a reclaimed water bin in sequence by a plurality of partitions with holes at the waist and the top, and the bins are connected in sequence, wherein the sewage inlet and the sewage suction port are connected to the anaerobic bin, and the overflow port and the water outlet are connected to the reclaimed water bin; a feeding port is provided on the top of the anaerobic bin, the aerobic bin 1 and the aerobic bin 2, respectively; an aeration disk is provided in the aerobic bin 1 and the aerobic bin 2, respectively, and the aeration disk is connected to the compressed air provided by the train through a pipeline; a submersible sewage pump is provided at the bottom of the sedimentation bin, and the water outlet of the submersible sewage pump is connected to the anaerobic bin through a pipeline; elastic fillers are provided in the anaerobic bin, the aerobic bin 1 and the aerobic bin 2, respectively; a vent is provided on the top of the aerobic bin 2, which is connected to it, and is connected to the outside atmosphere through an air filter.

[0006] Furthermore, the vacuum extraction system includes a vacuum toilet, a sewage buffer tank and a water booster tank arranged in the train toilet. The sewage buffer tank is a hollow structure, and a sewage inlet, a pressure gauge 1, a pressure sensor 1, an air vent 1 and an air vent 2 are respectively provided on the top, and a sewage outlet is provided on the bottom. The sewage outlet is connected to the sewage inlet arranged on the top of the sewage tank through a one-way valve 1, the sewage inlet is connected to the sewage outlet of the vacuum toilet through a one-way valve 2 and a vacuum diaphragm valve in sequence, the air vent 1 is connected to the compressed air provided by the train through a solenoid valve 1 and a pressure reducing valve in sequence, and the air vent 2 is connected to the compressed air provided by the train through a solenoid valve 2, a vacuum generator, a solenoid valve 3 and a pressure reducing valve in sequence.

[0007] Furthermore, the control pipeline of the vacuum diaphragm valve is connected to the second vent through a three-way solenoid valve, and the power for opening the vacuum diaphragm valve is derived from the vacuum in the sewage buffer tank.

[0008] Furthermore, the water booster tank is a hollow structure, with a drain outlet at the bottom, a lower water level sensor and an upper water level sensor respectively provided at the upper and lower parts of the waist, a water inlet, a third air vent, a second pressure gauge and a second pressure sensor respectively provided at the top, the drain outlet is connected to the vacuum toilet flushing pipe through a fourth solenoid valve, the water inlet is connected to the train's fresh water tank via a third check valve and a fifth solenoid valve in sequence, the third air vent is connected to the compressed air provided by the train via a sixth solenoid valve and a pressure reducing valve respectively, and is connected to the atmosphere via a seventh solenoid valve.

[0009] Furthermore, the pressure sensor 1, pressure sensor 2, lower water level sensor, upper water level sensor, solenoid valve 1, solenoid valve 2, solenoid valve 3, solenoid valve 4, solenoid valve 5, solenoid valve 6, solenoid valve 7 and three-way solenoid valve are electrically connected to the control system respectively, and the control system also includes a flush button arranged in the train toilet.

[0010] Furthermore, a high liquid level sensor is provided on the top of the anaerobic bin and is electrically connected to the control system. When the high liquid level sensor detects an electrical signal, the control system sends a manure extraction alarm signal.

[0011] Furthermore, a high liquid level sensor 2 is provided on the top of the intermediate water tank and is electrically connected to the control system, and a low liquid level sensor is provided on the bottom and is electrically connected to the control system. When the high liquid level sensor 2 detects an electrical signal, the control system sends an alarm signal for replacing the filter element and the reverse osmosis membrane; when the low liquid level sensor loses the electrical signal, the control system stops the booster pump.

[0012] Furthermore, the reverse osmosis processor is provided with a clean water outlet and a waste water outlet. The waste water outlet is connected to the anaerobic chamber through a pipeline, and the clean water outlet can be connected to a clean water tank through a pipeline for reuse in flushing toilets, or directly discharged outside the vehicle.

[0013] Furthermore, waste water from the wash basin in the train toilet and waste water from the train washroom can also be connected to the sewage inlet of the sewage tank through a pipe and discharged into the sewage tank for treatment by gravity flow.

[0014] Beneficial effect: Due to the adoption of the above structure, the utility model makes full use of the compressed air resources of the train. It not only adopts the vacuum suction technology to reduce the water consumption for flushing toilets and reduce the odor of toilets, but also makes the sewage generated in the train toilets can be immediately treated on the train, and discharged in compliance with the standards or reused for flushing toilets, thus avoiding the daily sewage discharge operation of the train. Daily operations only require replenishing clean water, adding medicines, and replacing filter elements and reverse osmosis membranes. In this way, the sewage discharge demand of the train will be significantly reduced, the pressure on sewage treatment at the station will be alleviated, and infrastructure and labor costs will be saved.

[0015] The utility model is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the specific implementation of the utility model or the technical solution in the prior art, the following is a brief introduction to the drawings required for the specific implementation or the prior art description. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, each element or part is not necessarily drawn according to the actual scale.

[0017] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the utility model.

[0018] Figure 2 It is a schematic diagram of a sewage treatment system according to an embodiment of the utility model.

[0019] Figure 3 It is a schematic diagram of a vacuum extraction system according to an embodiment of the utility model. DETAILED DESCRIPTION

[0020] like Figure 1 , Figure 2As shown, a railway passenger train onboard sewage treatment system includes a vacuum pumping system 1, a sewage treatment system 2 and a control system. The sewage treatment system 2 includes a sewage tank 23, a primary filter 210, a booster pump 29 and a reverse osmosis processor 28. The sewage tank 23 is made of welded steel plates, is hollow, and is arranged at the bottom of the train compartment. An electric heating plate 24 and a temperature sensor 25 are arranged at the bottom of the sewage tank. The outer layer of the sewage tank is sequentially covered with a rubber-plastic insulation layer 22 and an outer shell 21; the inner cavity of the sewage tank 23 is sequentially divided into a septic tank 23 by a plurality of partitions 2303 with holes at the waist and the top. The anaerobic bin 2301, the aerobic bin 1 2302, the facultative aerobic bin 2304, the aerobic bin 2308, the sedimentation bin 2307 and the intermediate water bin 2306 are connected in sequence. The sewage inlet 2311 and the sewage suction port 2312 arranged on the top of the sewage tank are connected to the anaerobic bin 2301, and the overflow port 2313 and the water outlet 2305 arranged on the side of the sewage tank are connected to the intermediate water bin 2306. The water outlet is connected to the primary filter 210, the booster pump 29 and the reverse osmosis processor 28 in sequence; the anaerobic bin 2301, the aerobic bin 1 2302 and the aerobic bin 2308, the sedimentation bin 2307 and the intermediate water bin 2306 are connected in sequence. 08 are provided with a feeding port 2310 at the top; aeration plates 26 are provided in the aerobic first warehouse 2302 and the aerobic second warehouse 2308, respectively, and the aeration plates are connected to the compressed air provided by the train through pipelines; a submersible sewage pump 212 is provided at the bottom of the sedimentation warehouse 2307, and the outlet of the submersible sewage pump is connected to the anaerobic warehouse 2301 through a pipeline; elastic fillers 27 are provided in the facultative aerobic warehouse 2304, the aerobic first warehouse 2302 and the aerobic second warehouse 2308; a vent 2309 is provided at the top of the aerobic second warehouse 2308 to communicate with it. Since the top of each partition 2303 has a hole, The top of the inner cavity of the sewage tank 23 is connected and connected to the outside atmosphere through the air filter 214; a high liquid level sensor 215 is provided on the top of the anaerobic chamber 2301 and is electrically connected to the control system; a high liquid level sensor 213 is provided on the top of the medium water chamber 2306 and is electrically connected to the control system, and a low liquid level sensor 211 is provided on the bottom and is electrically connected to the control system; the wastewater outlet 281 of the reverse osmosis processor 28 is connected to the anaerobic chamber 2301 through a pipeline, and the clean water outlet 282 can be connected to the clean water tank through a pipeline for reuse in flushing the toilet, or directly arranged outside the car.

[0021] The wastewater from the wash basin 3 of the train toilet and the wastewater from the train washroom can also be connected to the sewage inlet 2311 of the sewage tank 23 through a pipeline and discharged to the sewage tank for treatment by gravity flow. Since the waist opening of the partition 2303 between the sedimentation tank 2307 and the intermediate water tank 2306 is close to the top, the water levels of the anaerobic tank 2301, the aerobic first tank 2302, the facultative aerobic tank 2304, the aerobic second tank 2308 and the sedimentation tank 2307 are consistent and close to the full tank state under normal conditions. The sewage entering from the sewage inlet 2311 is processed in the anaerobic tank 2301, the aerobic first tank 2302, the facultative aerobic tank 2304, the aerobic second tank 2308 and the sedimentation tank 2307 in sequence, and then overflows into the intermediate water tank 2306, and is further processed by the primary filter 210 and the reverse osmosis processor 28. When the water level in the water tank 2306 is too low and the low liquid level sensor 211 loses the electrical signal, the control system stops the boost pump 29; when the water level in the water tank 2306 is too high, the high liquid level sensor 213 receives an electrical signal, indicating that the primary filter 210 and the reverse osmosis processor 28 are blocked and cannot be processed in time, and the control system sends an alarm signal for replacing the filter element and the reverse osmosis membrane. If the staff does not replace and process them in time, the water level of the recycled water continues to rise and finally flows out through the overflow port 2313; when the high liquid level sensor 1 215 receives an electrical signal, it indicates that the sewage in the anaerobic tank 2301 is blocked by fecal residue and cannot flow normally to the aerobic tank 1 2302, and the control system sends a fecal extraction alarm signal.

[0022] like Figure 1 , Figure 3As shown, the vacuum extraction system 1 includes a vacuum toilet 13, a sewage buffer tank 14 and a water booster tank 17 arranged in the train toilet. The sewage buffer tank 14 is a hollow structure, with a sewage inlet 142, a pressure gauge 145, a pressure sensor 146, a vent 143 and a vent 2 144 respectively provided on the top, and a sewage outlet 141 provided on the bottom. The sewage outlet is connected to the sewage inlet 2311 arranged on the top of the sewage tank 23 through a one-way valve 15, the sewage inlet 142 is connected to the sewage outlet 132 of the vacuum toilet through the one-way valve 2 11 and the vacuum diaphragm valve 12 in turn, the vent 143 is connected to the compressed air provided by the train through the solenoid valve 1 16 and the pressure reducing valve 111 in turn, the vent 2 144 is connected to the compressed air provided by the train through the solenoid valve 2 115, the vacuum generator 113, the solenoid valve 3 112 and the pressure reducing valve 111 in turn, and the vent 2 144 is also connected to the control pipeline of the vacuum diaphragm valve 12 through the three-way solenoid valve 114; the water booster tank 17 is a hollow structure, with a drain 171 provided on the bottom through the solenoid valve 4 1 6 is connected to the vacuum toilet flushing pipe 131, and a lower water level sensor 176 and an upper water level sensor 177 are respectively provided on the upper and lower parts of the waist, and a water inlet 174, an air vent 172, a pressure gauge 173 and a pressure sensor 175 are provided on the top. The water inlet 174 is connected to the train clean water tank through a one-way valve 18 and a solenoid valve 110 in sequence, and the air vent 172 is connected to the compressed air provided by the train through a solenoid valve 19 and a pressure reducing valve 111, and is communicated with the atmosphere through a solenoid valve 117; the pressure sensor 146, the pressure sensor 175, the lower water level sensor 176, the upper water level sensor 177, the solenoid valve 116, the solenoid valve 115, the solenoid valve 3 112, the solenoid valve 4 16, the solenoid valve 5 110, the solenoid valve 6 19, the solenoid valve 7 117 and the three-way solenoid valve 114 are respectively electrically connected to the control system, and the control system also includes a flush button arranged in the train toilet.

[0023] The vacuum pumping system 1 is in standby mode, the sewage buffer tank 14 is in a vacuum state, the water booster tank 17 is in a positive pressure state, and the water level is between the upper and lower water level sensors; press the flush button, the solenoid valve four 16 opens for a set time and then closes. Under the positive pressure in the water booster tank 17, the clean water in the water booster tank is pressed into the vacuum toilet 13, and the inner cavity of the vacuum toilet is flushed through the vacuum toilet flushing pipe 131. After the solenoid valve four 16 is closed, if the lower water level sensor 176 loses the electrical signal, the solenoid valve six 19 is closed, the solenoid valve seven 117 is opened, and the water booster tank 17 is closed. The electromagnetic valve 7 is connected to the atmosphere and is in a normal pressure state. The electromagnetic valve 5 110 is opened, and the clean water in the clean water tank on the top of the train flows into the water booster tank under the action of gravity until the upper water level sensor 177 detects an electrical signal. The electromagnetic valve 5 110 and the electromagnetic valve 7 117 are closed, and the electromagnetic valve 6 19 is opened to pass compressed air into the water booster tank 17 until the pressure sensor 2 175 detects that the pressure in the water booster tank 17 reaches the set value, and the electromagnetic valve 6 is closed; the electromagnetic valve 4 16 is opened for a set time, and the three-way electromagnetic valve 114 is closed after the set time. , the control pipeline of the vacuum diaphragm valve 12 is connected to the vacuum in the sewage buffer tank 14, the vacuum diaphragm valve and the one-way valve 11 are opened under the action of negative pressure, and the sewage in the vacuum toilet 13 and the air in the toilet are sucked into the sewage buffer tank 14 under the action of negative pressure; after the three-way solenoid valve 114 is closed, the control pipeline of the vacuum diaphragm valve 12 is connected to the atmosphere, the vacuum diaphragm valve and the one-way valve 11 are reset and closed, at this time, the sewage buffer tank 14 is in a normal pressure state, the solenoid valve 116 is opened for a set time and then closed, and compressed air is injected into the sewage buffer tank 14, and under the action of positive pressure The lower one-way valve 15 is opened, so that the sewage buffered in the sewage buffer tank is discharged to the anaerobic chamber 2301 under the action of positive pressure. When the solenoid valve 116 is closed and the pressure in the sewage buffer tank is exhausted to normal pressure, the one-way valve 15 is automatically closed; the solenoid valve 2 115 and the solenoid valve 3 112 are opened, the vacuum generator 113 is connected to the compressed air, and the air in the sewage buffer tank 14 is sucked through the solenoid valve 2. When the pressure sensor 146 detects that the vacuum degree in the sewage buffer tank reaches the set value, the solenoid valve 2 115 and the solenoid valve 3 112 are closed, and the vacuum extraction system 1 is on standby.

Claims

1. A sewage treatment system on a railway passenger train, comprising a vacuum pumping system (1), a sewage treatment system (2) and a control system, characterized in that The sewage treatment system comprises a sewage tank (23), a primary filter (210), a booster pump (29) and a reverse osmosis processor (28); the sewage tank (23) is arranged at the bottom of a train compartment; an electric heating plate (24) and a temperature sensor (25) are arranged at the bottom of the sewage tank; the outer layer of the sewage tank is covered with a rubber-plastic insulation layer (22) and an outer shell (21) in sequence; a sewage inlet (2311) and a sewage suction port (2312) are respectively arranged at the top of the sewage tank; an overflow port (2313) and a water outlet (2305) are arranged at the side; the water outlet (2305) is connected to the primary filter (210), the booster pump (29) and the reverse osmosis processor (28) in sequence; a replaceable filter element is built into the primary filter; and a replaceable reverse osmosis membrane is built into the reverse osmosis processor.

2. A railway passenger train onboard sewage treatment system according to claim 1, characterized in that The sewage tank (23) is made of welded steel plates and is hollow. The inner cavity is sequentially divided into an anaerobic chamber (2301), an aerobic chamber 1 (2302), an anaerobic chamber (2304), an aerobic chamber 2 (2308), a sedimentation chamber (2307) and a medium water chamber (2306) by a plurality of partitions (2303) with holes at the waist and top. The chambers are sequentially connected, wherein the sewage inlet (2311) and the sewage suction port (2312) are connected to the anaerobic chamber (2301), and the overflow port (2313) and the water outlet (2305) are connected to the medium water chamber (2306); the anaerobic chamber (2301), the aerobic chamber 1 (2302) and the aerobic chamber 2 (2308) are connected to the medium water chamber (2306); A feeding port (2310) is provided at the top of each of the aerobic bins (2302 and 2308); an aeration plate (26) is provided in each of the aerobic bins (2302 and 2308), and the aeration plate is connected to the compressed air provided by the train through a pipeline; a submersible sewage pump (212) is provided at the bottom of the sedimentation bin (2307), and the water outlet of the submersible sewage pump is connected to the anaerobic bin (2301) through a pipeline; elastic fillers (27) are provided in each of the facultative aerobic bin (2304), the aerobic bins (2302 and 2308); a vent (2309) is provided at the top of the aerobic bin (2308) and is connected thereto, and is connected to the outside atmosphere through an air filter (214).

3. A railway passenger train onboard sewage treatment system according to claim 1, characterized in that The vacuum extraction system (1) comprises a vacuum toilet (13) arranged in a train toilet, a sewage buffer tank (14) and a water booster tank (17); the sewage buffer tank (14) is a hollow structure, with a sewage inlet (142), a pressure gauge (145), a pressure sensor (146), a vent (143) and a vent (144) respectively arranged on the top, and a sewage outlet (141) arranged on the bottom. The sewage outlet is connected to a sewage inlet (142) arranged on the top of a sewage tank (23) via a one-way valve (15). The sewage inlet (142) is connected to the sewage outlet (132) of the vacuum toilet via the one-way valve (11) and the vacuum diaphragm valve (12) in sequence; the vent (143) is connected to the compressed air provided by the train via the solenoid valve (116) and the pressure reducing valve (111) in sequence; the vent (144) is connected to the compressed air provided by the train via the solenoid valve (115), the vacuum generator (113), the solenoid valve (112) and the pressure reducing valve (111) in sequence.

4. A railway passenger train onboard sewage treatment system according to claim 3, characterized in that The control pipeline of the vacuum diaphragm valve (12) is connected to the second vent (144) via a three-way solenoid valve (114), and the power for opening the vacuum diaphragm valve (12) is derived from the vacuum in the sewage buffer tank (14).

5. A railway passenger train onboard sewage treatment system according to claim 3, characterized in that The water booster tank (17) is a hollow structure, with a drain outlet (171) at the bottom, a lower water level sensor (176) and an upper water level sensor (177) at the upper and lower parts of the waist, respectively, and a water inlet (174), a third vent (172), a second pressure gauge (173) and a second pressure sensor (175) at the top. The drain outlet (171) is connected to the vacuum toilet flushing pipe (131) through a fourth solenoid valve (16), the water inlet (174) is connected to the train clean water tank through a third check valve (18) and a fifth solenoid valve (110) in sequence, the third vent (172) is connected to the compressed air provided by the train through a sixth solenoid valve (19) and a pressure reducing valve (111), and is communicated with the atmosphere through a seventh solenoid valve (117).

6. A railway passenger train onboard sewage treatment system according to claim 5, characterized in that The pressure sensor 1 (146), the pressure sensor 2 (175), the lower water level sensor (176), the upper water level sensor (177), the solenoid valve 1 (116), the solenoid valve 2 (115), the solenoid valve 3 (112), the solenoid valve 4 (16), the solenoid valve 5 (110), the solenoid valve 6 (19), the solenoid valve 7 (117) and the three-way solenoid valve (114) are respectively electrically connected to a control system, and the control system also includes a flush button arranged in a train toilet.

7. A railway passenger train onboard sewage treatment system according to claim 2, characterized in that A high liquid level sensor 1 (215) is provided on the top of the anaerobic chamber (2301) and is electrically connected to the control system. When the high liquid level sensor 1 detects an electrical signal, the control system sends a manure extraction alarm signal.

8. A railway passenger train onboard sewage treatment system according to claim 7, characterized in that A second high liquid level sensor (213) is provided at the top of the intermediate water tank (2306) and is electrically connected to the control system, and a low liquid level sensor (211) is provided at the bottom and is electrically connected to the control system. When the second high liquid level sensor (213) detects an electrical signal, the control system issues an alarm signal for replacing the filter element and the reverse osmosis membrane; when the low liquid level sensor (211) loses the electrical signal, the control system stops the booster pump (29) from working.

9. A railway passenger train onboard sewage treatment system according to claim 8, characterized in that The reverse osmosis processor (28) is provided with a clean water outlet (282) and a waste water outlet (281), wherein the waste water outlet is connected to the anaerobic chamber (2301) via a pipeline, and the clean water outlet can be connected to a clean water tank via a pipeline for reuse in toilet flushing, or directly disposed outside a vehicle.

10. A railway passenger train onboard sewage treatment system according to claim 9, characterized in that Wastewater from the wash basin (3) of the train toilet and wastewater from the train washroom can also be connected to the sewage inlet (2311) of the sewage tank (23) through a pipeline and discharged into the sewage tank for treatment through gravity flow.

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