A waste line system and method of assisted flushing using the same

Abstract

A waste line system comprises a waste main, a downstream end of the waste main being in communication with a waste collection container; at least one waste branch, a downstream end of each waste branch being in communication with the waste main at a respective point; and a waste producing device, each waste producing device being in communication with an upstream end of a respective waste branch so as to discharge waste produced therein into the waste collection container via the respective waste branch and the waste main, wherein the waste line system further comprises a residual waste detection device arranged along the waste main to detect whether there is residual waste in the waste main, and an auxiliary flushing device configured to be able to perform auxiliary flushing on a pipe section of the waste main in which residual waste is detected by the residual waste detection device. A method of performing auxiliary flushing using the waste line system is also disclosed. The present invention can effectively prevent waste line fouling and clogging, thereby reducing aircraft operation and maintenance costs.

Description

Technical Field

[0001] This invention relates to the technical field of wastewater treatment systems. Specifically, this invention relates to an anti-clogging auxiliary flushing device for a vacuum wastewater pipeline in a civil aircraft wastewater system. Through corresponding control methods, wastewater residue is detected, and the vacuum wastewater pipeline is flushed to prevent clogging caused by residue, drying, and scale buildup in the wastewater pipeline after each toilet flush cycle, which could lead to the failure of the wastewater treatment system and affect aircraft operations. Background Technology

[0002] The main principle of the aircraft's wastewater treatment system is to use the negative pressure created between the wastewater treatment system and the cabin to pump wastewater from the toilet and transport it to the wastewater tank. When performing a toilet flush cycle, the user first presses the toilet flush button, then the toilet drain valve opens, and wastewater is drawn into the wastewater delivery pipeline along with cabin air and transported to the wastewater tank. After a few seconds, the toilet drain valve closes, and the flush cycle ends.

[0003] Current single-flush-and-cycle toilet technology has several drawbacks. A research paper on the reliability of wastewater piping for a certain aircraft model points out that during actual operation of the fleet, vacuum toilets repeatedly failed due to sewage pipe blockage, severely impacting airline service quality and aircraft operation. Inspection of the main blockage pipe revealed severe scale buildup on the inner wall, with some sections exceeding 10mm in thickness. The average number of toilet blockages was 32.1 per year, with a maximum of 42, resulting in significant maintenance costs and increased overall expenses.

[0004] The reasons for this are threefold: First, the toilet flushing cycle is usually set to a fixed sequence and cannot be adjusted according to the amount of wastewater in the pipes. When there is a large amount of waste, some wastewater remains in the wastewater pipes and quickly dries on the pipe walls, forming scale. Over time, the scale accumulates. Second, after a blockage occurs, pouring crushed ice into the toilet and performing a flushing cycle does not soften or break down the scale, as the ice is of similar hardness to the scale. Third, during scheduled checks, the toilet is removed, and a circulation pump is connected to the pipes to allow the cleaning solution to circulate for 4-8 hours. While this method flushes the pipes, it is time-consuming and, due to the lack of scale detection, the cleaning is not thorough enough.

[0005] Currently, there are no effective measures for foreign models to address the issues of wastewater residue, scale buildup, and easy clogging in vacuum wastewater pipelines. Summary of the Invention

[0006] Based on the aforementioned technical problems in the prior art, this invention aims to provide a wastewater discharge pipeline system and related methods to effectively solve the problems of frequent wastewater residue and scale buildup in pipelines, undetectable residue, and inability to clean wastewater pipelines in a timely manner. This effectively prevents scale buildup and blockage in pipelines, thereby reducing aircraft operation and maintenance costs. The system and method of this invention solve the aforementioned core technical problems and are applicable to multiple aircraft models.

[0007] Therefore, the present invention provides a waste discharge pipeline system, comprising:

[0008] A waste discharge main pipe, the downstream end of which is connected to a waste collection container;

[0009] At least one waste discharge branch pipe, the downstream end of each waste discharge branch pipe being connected to the main waste discharge pipe at a corresponding point; and

[0010] Each waste generating device is connected to the upstream end of a corresponding waste discharge branch pipe, so that the waste generated therein can be discharged into the waste collection container via the corresponding waste discharge branch pipe and the main waste discharge pipe.

[0011] The waste discharge pipeline system further includes a residual dirt detection device and an auxiliary flushing device. The residual dirt detection device is installed along the waste discharge main pipe to detect whether there is dirt residue in the waste discharge main pipe. The auxiliary flushing device is configured to perform auxiliary flushing on the pipe section of the waste discharge main pipe where the residual dirt detection device detects dirt residue.

[0012] According to a preferred embodiment of the waste discharge pipeline system of the present invention, the residual waste detection device includes a plurality of pressure detection devices distributed along the waste discharge main pipe, thereby dividing the waste discharge main pipe into a plurality of pipe segments, and the pressure detection devices are capable of reflecting the pressure value of the waste discharge main pipe at the corresponding points.

[0013] According to a preferred embodiment of the waste discharge pipeline system of the present invention, the residual contaminant detection device is configured to detect whether there is residual contaminant in the waste discharge main pipe by means of the following steps:

[0014] The unit pressure difference of the main exhaust pipe between two adjacent pressure sensing devices is calculated as follows:

[0015]

[0016] Where: Δp is the unit pressure difference in the pipeline.

[0017] P1 and P2 are the measured pressure values ​​of two adjacent pressure sensing devices.

[0018] L is the length of the main drain pipe between two adjacent pressure sensing devices, and

[0019] δ is the pipe variation coefficient, used to normalize the flow resistance of pipes with bends and those without bends, thus eliminating the influence of local resistance from bends; and

[0020] Grubbs outlier analysis is used to determine whether wastewater residue has occurred in each section of the pipeline.

[0021] According to a preferred embodiment of the waste discharge pipeline system of the present invention, a venting device is provided at the upstream end of the waste discharge main pipe. The venting device is configured to connect the inside and outside of the waste discharge main pipe when the plurality of pressure sensing devices are working, so as to allow airflow to be generated in the waste discharge main pipe.

[0022] According to a preferred embodiment of the waste discharge pipeline system of the present invention, the auxiliary flushing device is located downstream of the corresponding waste generating device on the waste discharge branch pipe, and is used to perform auxiliary flushing to the waste discharge main pipe via the corresponding waste discharge branch pipe.

[0023] According to a preferred embodiment of the waste discharge pipeline system of the present invention, the auxiliary flushing device includes an air intake component and / or a cleaning agent dispensing component, wherein the air intake component is used to introduce external air for auxiliary flushing, and the cleaning agent dispensing component is used to dispense cleaning agent into the waste discharge branch pipe for auxiliary flushing.

[0024] According to a preferred embodiment of the waste discharge pipeline system of the present invention, the air intake assembly includes an air inlet and an air intake valve.

[0025] The cleaning agent dispensing assembly includes a cleaning agent container with a cleaning agent replenishment port and a cleaning agent dispensing pump.

[0026] The present invention also relates to a method for auxiliary flushing using the waste discharge pipeline system described above, the method comprising the following steps:

[0027] The presence of residual contaminants in the waste discharge main is detected by a residual contaminant detection device installed along the waste discharge main.

[0028] If a section of the main waste discharge pipe is found to contain residual contaminants, then at least the auxiliary flushing device upstream of the upstreammost section containing the contaminants will be activated to perform auxiliary flushing.

[0029] According to a preferred embodiment of the method of the present invention, the detection step begins 10 seconds after the normal flushing cycle of the waste generating device ends.

[0030] According to a preferred embodiment of the method of the present invention, if a pipe section with residual dirt is detected in the waste discharge main, the auxiliary flushing device upstream of each pipe section with residual dirt is actuated to perform auxiliary flushing.

[0031] In summary, this invention proposes a vacuum wastewater pipeline auxiliary flushing device and control method. Firstly, it has a wastewater residue detection function. By using pressure sensors placed in different pipeline sections to perform piezoresistive measurements of different sections, wastewater residue can be detected. Secondly, it has an auxiliary flushing function. By installing an auxiliary flushing device near the toilet and implementing a corresponding control method, cleaning agent is added while the air inlet is open, using high-speed air to mix the cleaning agent and assist in flushing the pipeline residue. This invention effectively solves the problems of frequent wastewater residue and scale buildup in pipelines, undetectable residue, and inability to clean wastewater pipelines in a timely manner. It effectively prevents scale buildup and blockage in pipelines, thereby reducing aircraft operation and maintenance costs. Attached Figure Description

[0032] This document includes accompanying drawings to provide a further understanding of various embodiments. The drawings are incorporated in and form part of this specification.

[0033] The accompanying drawings illustrate various embodiments described herein and, together with the textual description, serve to explain the principles and operation of the claimed subject matter.

[0034] With reference to the above objectives, the technical features of the present invention are clearly described below, and its advantages will be apparent from the following detailed description with reference to the accompanying drawings, which illustrate preferred embodiments of the invention by way of example, without limiting the scope of the invention.

[0035] In the attached image:

[0036] Figure 1 This is a schematic diagram of a preferred embodiment of the waste discharge pipeline system according to the present invention;

[0037] Figure 2 yes Figure 1 A schematic diagram of the auxiliary flushing device in a preferred embodiment of the waste discharge pipeline system shown; and

[0038] Figure 3 A flowchart of a method for auxiliary flushing using a waste discharge pipeline system according to the present invention is shown.

[0039] List of reference numerals

[0040] 10 Waste Discharge Piping System

[0041] 100 Waste Discharge Main Pipe

[0042] 200 Waste Collection Containers

[0043] 300 waste discharge branch pipe

[0044] 400 Waste Generation Equipment

[0045] 500 Residual Dirt Detection Device

[0046] 600 Auxiliary Flushing Device

[0047] 610 Intake Assembly

[0048] 611 air intake

[0049] 612 Intake Valve

[0050] 620 Cleaning Agent Dosing Component

[0051] 621 Cleaning agent refill port

[0052] 622 Cleaning Agent Container

[0053] 623 Cleaning Agent Dispensing Pump

[0054] 700 ventilation device

[0055] 800 control module Detailed Implementation

[0056] Embodiments of the invention will now be described in detail, examples of which are shown in the accompanying drawings and described below.

[0057] Although the invention will be described in conjunction with exemplary embodiments, it should be understood that this specification is not intended to limit the invention to the embodiments illustrated.

[0058] Conversely, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modifications, equivalent forms and other embodiments that may be included within the spirit and scope of the invention.

[0059] To facilitate explanation and precise definition of the technical solutions of the present invention, the terms "upper," "lower," "inner," and "outer" are used to describe these features with reference to the positions of features in the exemplary embodiments shown in the accompanying drawings.

[0060] Various preferred but non-limiting embodiments of the envelope of the present invention will be described in detail below with reference to the accompanying drawings.

[0061] Figure 1 A preferred embodiment of a waste discharge pipeline system 10 according to the present invention is shown, comprising: a waste discharge main pipe 100, at least one waste discharge branch pipe 300, and a waste generation device 400.

[0062] The downstream end of the waste discharge main pipe 100 is connected to the waste collection container 200.

[0063] The downstream end of each waste discharge branch pipe 300 is connected to the waste discharge main pipe 100 at the corresponding point.

[0064] Each waste generating device 400 is connected to the upstream end of the corresponding waste discharge branch pipe 300 so that the waste generated therein can be discharged into the waste collection container 200 through the corresponding waste discharge branch pipe 300 and the waste discharge main pipe 100.

[0065] The waste discharge pipeline system 10 also includes a residual dirt detection device 500 and an auxiliary flushing device 600.

[0066] A residual contaminant detection device 500 is installed along the wastewater main 100 to detect whether there is residual contaminant in the wastewater main 100. Preferably, the residual contaminant detection device 500 may include multiple pressure detection devices distributed along the wastewater main 100, thereby dividing the wastewater main 100 into multiple pipe sections, and the pressure detection devices can reflect the pressure value of the wastewater main 100 at corresponding points. More preferably, pressure sensors can be arranged at intervals of several meters according to the length of the wastewater pipeline (for example, preferably one every 5 meters) to measure the pressure at different parts of the pipeline.

[0067] In a preferred embodiment, the residual contaminant detection device 500 may include a front-end venting device and several pressure sensor groups. The front-end venting device may be installed at the very beginning of the vacuum wastewater pipeline for introducing air to perform pressure detection. One or more pressure sensor groups are distributed along the main vacuum wastewater pipeline to detect whether there is residual wastewater in the main wastewater pipeline.

[0068] The residual contaminant detection device 500 is preferably configured to detect whether there is residual contaminant in the waste discharge main 100 by means of the following steps:

[0069] The unit pressure difference between two adjacent pressure sensing devices in the main exhaust pipe 100 is calculated as follows:

[0070]

[0071] Where: Δp is the unit pressure difference in the pipeline.

[0072] P1 and P2 are the measured pressure values ​​of two adjacent pressure sensing devices.

[0073] L is the length of the main drain pipe 100 between two adjacent pressure sensing devices, and

[0074] δ is the pipe variation coefficient, used to normalize the flow resistance of pipes with bends and those without bends, thus eliminating the influence of local resistance from bends; and

[0075] Grubbs outlier analysis is used to determine whether wastewater residue has occurred in each section of the pipeline.

[0076] The auxiliary flushing device 600 is configured to perform auxiliary flushing on the section of the waste discharge main 100 where the residual dirt detection device 500 detects residual dirt.

[0077] Preferably, the auxiliary flushing device 600 is located downstream of the corresponding waste-generating device 400 on the waste discharge branch pipe 300, and is used to assist flushing to the main waste discharge pipe 100 via the corresponding waste discharge branch pipe 300. Preferably, the auxiliary flushing device 600 can be placed on the wastewater pipe section behind the toilet, and is used to assist flushing the waste residue in the pipe section from the toilet to the wastewater tank.

[0078] More preferably, see Figure 2 The auxiliary flushing device 600 may include an air intake assembly 610 and / or a cleaning agent dispensing assembly 620. The air intake assembly 610 is used to introduce external air for auxiliary flushing, and the cleaning agent dispensing assembly 620 is used to dispense cleaning agent into the waste discharge branch pipe 300 for auxiliary flushing. The air intake assembly 610 may include an air inlet 611 and an air inlet valve 612. The air inlet valve 612 may include, but is not limited to, a solenoid air inlet valve. The air intake assembly 610 may also include a ventilation structure for airflow. The cleaning agent dispensing assembly 620 may include a cleaning agent container 622 with a cleaning agent replenishment port 621 as a cleaning agent storage device and a cleaning agent dispensing pump 623 as a cleaning agent dispensing device. The cleaning agent dispensing pump 623 may, for example, be a small pump assembly. Furthermore, the auxiliary flushing module may also include one or both of a pipe body and a top filter screen.

[0079] A venting device 700 may preferably be provided at the upstream end of the waste discharge main 100. The venting device 700 is configured to connect the inside and outside of the waste discharge main 100 when multiple pressure sensing devices are operating, so as to allow airflow within the waste discharge main 100. The venting device 700 may include, but is not limited to, an electromagnetic venting valve.

[0080] The waste discharge pipeline system 10 of the present invention may further include a control module 800 for controlling the operation of various components. The control module 800 may have data processing functions for executing the control algorithm of the auxiliary flushing device. The control module 800 may output the ventilation device switch command of the auxiliary flushing device 600, output the cleaning agent dosing command, receive pressure sensor signals for pressure resistance measurement and analysis, perform auxiliary flushing logic judgment, and store and retrieve data.

[0081] The following is for reference Figure 3 The present invention describes in detail a method for auxiliary flushing using a waste discharge pipeline system 10, the method comprising the following steps:

[0082] A method for detecting whether there is residual waste in the waste discharge main pipe 100 using a residual waste detection device 500. Specifically, the residual waste detection device 500 installed along the waste discharge main pipe 100 detects whether there is residual waste in the waste discharge main pipe 100.

[0083] If residual contaminants are detected, the auxiliary flushing device 600 is controlled to perform auxiliary flushing on the main pipeline. Specifically, if a section of the waste discharge main pipe 100 is found to contain residual contaminants, the auxiliary flushing device 600 upstream of the upstreammost section containing the contaminants is activated to perform auxiliary flushing.

[0084] The detection step begins some time after the normal flushing cycle of the waste-generating equipment 400 has ended, for example, 5 to 10 seconds, preferably 10 seconds. This time length can be determined according to actual needs and will not be elaborated here.

[0085] If a section of the waste discharge main 100 is found to contain residual contaminants, the auxiliary flushing device 600 upstream of each section containing residual contaminants will be activated to perform auxiliary flushing.

[0086] The method for detecting whether dirt residue has occurred in the detection pipeline includes:

[0087] Step 1: Turn on the ventilation device 700 at the front end of the residual dirt detection device 500.

[0088] Step 2: Continuously measure the pressure value using several pressure sensors distributed along the main pipeline of the vacuum wastewater pipeline.

[0089] Step 3: After the above steps 1 and 2 continue for a certain period of time, for example 3 to 6 seconds, preferably 4 seconds, close the front ventilation device 700 and the sensor stops measuring data.

[0090] Step 4: Data processing is performed through the control module 800. Specifically, the pressure sensor data is analyzed to determine whether there is any residue in the main pipeline of the vacuum wastewater pipeline, and in which section of the pipeline the residue occurs.

[0091] The method for analyzing and determining whether wastewater residue occurs in the main pipeline of the vacuum wastewater pipeline and in which section of the pipeline the residue occurs may include:

[0092] The unit pressure difference in the pipeline between two adjacent sensors is calculated as follows:

[0093]

[0094] In the formula: Δp is the unit pressure difference in the pipeline;

[0095] P1 and P2 are the measured pressure values ​​of two adjacent pressure sensors;

[0096] L is the length of the main pipeline between two adjacent pressure sensors;

[0097] δ is the pipeline variation coefficient, which is adjusted according to the degree of pipeline curvature.

[0098] Methods for determining whether there is residual contaminants, such as wastewater residue, in a section of pipeline:

[0099] Determine whether the following inequalities are true:

[0100]

[0101] Where: Δpi is the unit pressure difference of the i-th segment of the waste discharge main pipe;

[0102] The average unit pressure difference across all sections of the main waste discharge pipe;

[0103] g(n,α) is obtained by looking up the Grubbs critical value table using the total number of pipe segments n and the confidence level α (obtained from experiments);

[0104] σ(Δp) is the standard deviation of the unit pressure difference of each pipeline in the main waste discharge pipe.

[0105] If the unit pressure difference of a certain section of pipeline satisfies the above inequality, it is determined that the section of pipeline is blocked. If it does not satisfy the inequality, then the section of pipeline has no dirt residue or blockage.

[0106] In the formula: Δpi is the unit pressure difference of the i-th pipeline segment.

[0107] If contaminants are found to remain in a section of the pipeline during the above steps, the control module 800 sends an auxiliary flushing command to the auxiliary flushing module upstream of that section of the pipeline, based on the location of the contaminant. The method for controlling the auxiliary flushing module to perform auxiliary flushing of the main pipeline includes:

[0108] Step 1: The control module 800 sends an auxiliary flushing command to the corresponding auxiliary flushing module based on the pipeline where residue has occurred.

[0109] Step 2: The auxiliary flushing device 600 is turned on, and the cleaning agent dispensing device dispenses cleaning agent into the pipeline.

[0110] Step 3: After Step 2 has been running for a certain period of time, such as 3 to 6 seconds, preferably 4 seconds, stop running.

[0111] In the method of auxiliary flushing device 600 for auxiliary flushing of the main pipeline, the method for determining the auxiliary flushing device corresponding to the pipeline where wastewater residue occurs in step 1 is as follows: search from the pipeline section where wastewater residue occurs towards the machine head side, and the first auxiliary flushing device found is the corresponding auxiliary flushing device.

[0112] Upon receiving a command from control module 800, the corresponding auxiliary flushing device opens and closes. When open, air enters and flows into the pipeline via the control valve. The automatic cleaning agent dispensing component includes a small pump assembly and a cleaning agent replenishment port. The small pump assembly is an electrical component that, upon receiving a signal, pumps a measured amount of cleaning agent into the path. Cleaning agent can be replenished internally via the cleaning agent replenishment port along the flight path to refill consumables.

[0113] In addition, when the pressure difference between the inside and outside of the machine is less than 2.54 psig, the vacuum pump can be turned on during auxiliary flushing.

[0114] In summary, this invention proposes an auxiliary flushing architecture for detecting residual wastewater and assisting in the flushing of wastewater pipelines. After a toilet flushing cycle, the auxiliary flushing device installed after the toilet drain valve is activated. When the auxiliary flushing device's control valve opens, air enters the pipeline, forming high-speed air under negative pressure. Simultaneously, the auxiliary flushing device automatically dispenses cleaning agent. This axial high-speed air-to-cleaning mixture then assists in flushing the remaining, undried wastewater in the vacuum wastewater pipeline, preventing scale buildup and blockages.

[0115] This invention also proposes an auxiliary flushing control method for preventing blockages in civil aircraft vacuum wastewater pipelines, which issues flushing commands to specific pipe sections where wastewater residue is located after wastewater residue detection. The technical advantages are: identifying pipe sections with wastewater residue and performing targeted flushing; focusing more on flushing wastewater residue; avoiding the waste of resources from blind flushing of the entire pipe section; more effectively achieving wastewater-free pipelines; preventing wastewater drying, scale buildup, and blockages; and improving the reliability of the wastewater system.

[0116] Scale buildup and blockage in wastewater pipelines of wastewater treatment systems is a key technical problem in the operation of wastewater systems and can be applied to future development directions such as conceptual and long-term technologies.

[0117] In summary, the wastewater discharge pipeline system and usage control method of the present invention effectively solve the problems of frequent wastewater residue and scale buildup, undetectable residue, and inability to flush wastewater pipelines in a timely manner. It effectively prevents wastewater residue and scale buildup in pipelines, reduces pipeline blockage rate, saves airline operating costs and a large amount of maintenance costs, improves system comfort, and enhances aircraft competitiveness.

[0118] The preferred embodiments of the present invention have been described in detail above, but it should be understood that, if necessary, aspects of the embodiments can be modified to utilize aspects, features, and concepts from various patents, applications, and publications to provide other embodiments.

[0119] In light of the detailed description above, these and other changes can be made to the embodiments described herein.

[0120] Generally speaking, the terminology used in the claims should not be considered as limited to the specific embodiments disclosed in the specification and claims, but should be understood to include all possible embodiments together with the full scope of equivalents enjoyed by these claims.

Claims

1. A waste line system (10) comprising: a waste main (100) having a downstream end in communication with a waste collection vessel (200); at least one waste branch (300), each having a downstream end in communication with the waste main (100) at a respective point; and waste producing equipment (400), each in communication with an upstream end of a respective waste branch (300) to discharge waste produced therein through the respective waste branch (300) and the waste main (100) into the waste collection vessel (200), wherein the waste line system (10) further comprises residual waste detection means (500) arranged along the waste main (100) to detect whether there is residual waste in the waste main (100), and auxiliary flushing means (600) configured to perform auxiliary flushing on a section of the waste main (100) in which residual waste is detected by the residual waste detection means (500), the residual waste detection means (500) comprising a plurality of pressure detecting devices distributed along the waste main (100) to divide the waste main (100) into a plurality of sections, the pressure detecting devices being capable of reflecting the pressure value of the waste main (100) at the respective point, the residual waste detection means (500) being configured to detect whether there is residual waste in the waste main (100) by the following steps: calculating the unit pressure difference of the waste main (100) between two adjacent pressure detecting devices by the following method: ， wherein: is the pipe unit differential pressure, P1, P2 are the measured pressure values of the two adjacent pressure detecting devices, L is the length of the waste main (100) between the two adjacent pressure detecting devices, and is the pipe variation coefficient, which is used to normalize the pipe flow resistance with bend and without bend by pipe variation coefficient, excluding the influence of local resistance of bend; and determining whether residual waste occurs in each section of the line by Grubbs outlier analysis, the auxiliary flushing means (600) comprising an air inlet assembly (610) for introducing external air for auxiliary flushing and a cleaning agent dispensing assembly (620) for dispensing cleaning agent into the waste branch (300) for auxiliary flushing, the air inlet assembly (610) comprising an air inlet (611) and an air inlet valve (612), and the cleaning agent dispensing assembly (620) comprising a cleaning agent container (622) with a cleaning agent replenishment port (621) and a cleaning agent dispensing pump (623).

2. The waste line system (10) according to claim 1, characterized in that an air vent device (700) is arranged at the upstream end of the waste main (100), the air vent device (700) being configured to communicate the inside and outside of the waste main (100) when the plurality of pressure detecting devices are working to allow air flow to flow in the waste main (100).

3. The waste line system (10) according to claim 1, characterized in that The auxiliary flushing devices (600) are arranged downstream of the respective waste branch (300) of the waste producing device (400) for auxiliary flushing via the respective waste branch (300) into the waste main (100).

4. A method for auxiliary flushing using a waste line system (10) according to any one of claims 1 to 3, the method comprising the steps of: detecting by means of a residual waste detection device (500) arranged along the waste main (100) whether there is residual waste in the waste main (100); if a waste segment with residual waste is detected in the waste main (100), at least actuating the auxiliary flushing device (600) upstream of the most upstream waste segment with residual waste for auxiliary flushing.

5. The method according to claim 4, characterized in that the detection step is started 10 seconds after the end of a normal flushing cycle of the waste producing device (400).

6. The method according to claim 4, characterized in that if a waste segment with residual waste is detected in the waste main (100), the auxiliary flushing device (600) upstream of each waste segment with residual waste is actuated for auxiliary flushing.

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