Patent Publication Number: US-2023154152-A1

Title: Waste Disposal System and Method for Detecting Impurities in Waste Containers

Description:
The present invention relates to a waste disposal system for contaminant detection in waste containers, according to the preamble of claim  1 , as well as a corresponding method. 
     Efficient waste disposal systems are an essential part of the circulating economy. It is of great importance that the wastes being disposed of are efficiently reused to the greatest possible extent. For this, it is necessary to distinguish recyclable contents of waste from contaminants which may be present in the wastes and to separate them cleanly from each other. 
     While in the past it was primarily necessary for those generating the wastes, such as households and industrial operations, to undertake themselves the separation of the wastes into individual contents and valuable materials, for some time now systems are also known in which the wastes are investigated for their contents during the disposal process, so that sorting mistakes can be identified. For example, EP 3 553 698 A1 discloses a system for detecting the components of wastes, in which a camera system is mounted on the disposal vehicle in which the individual waste containers are being emptied. The disposal vehicle is outfitted with a conventional device for receiving the waste container in a receiving position and moving it from this to an emptying position, in which the contents of the container are dumped into a waste collection room of the vehicle. The camera system comprises three different optical recording devices, a first optical recording device to record a 2D color image, a second optical recording device to record a plurality of 2D spectral images, and a third optical recording device to record a 3D image. Thanks to an image analysis by means of a neural network, it is possible to detect individual components of each waste container emptied and utilize this to optimize the processing of the wastes. 
     The drawback for this known system, however, is that the optical analysis of the wastes occurs only when the contents of the waste container are already in the waste collection room. Images of the waste are made only after the wastes are distributed on a surface provided for this purpose in the vehicle. Although a wrong sorting of the particular waste container can be determined at this time, it is not possible to prevent wrongly sorted wastes from getting into the waste collection room, e.g., by a dump stop which prevents an emptying in good time. Moreover, it is desirable to largely avoid any modification of the disposal vehicle itself, such as the aforementioned surface on which the contents of the waste containers need to be spread out. Finally, it is desirable to organize the waste disposal system such that individual containers are matched up with an evaluation of the quality of the wastes and assessed for the further waste management, for example, for accounting purposes or other personalized measures addressed directly to the waste producer, such as an informational or warning letter. 
     It is therefore the problem of the present invention to create a waste disposal system and a corresponding method in which the earliest possible individual checking of the waste quality of the individual waste containers can be done, even before their contents arrive in the waste collection room of the disposal vehicle, and to increase the accuracy of the detection of contaminants in the wastes. 
     This problem is solved according to the invention by a waste disposal system having the features of claim  1  as well as a corresponding method having the features of claim  10 . 
     The camera system of the waste disposal system according to the invention comprises a first camera and a second camera with different functions. The first camera serves for recording at least one image of the contents of the waste container prior to its being emptied in a top view. The second camera serves for recording a sequence of images of the contents of the waste container during its emptying. Thus, while the first camera represents the contents of the waste container statically, the second camera can record them dynamically during the dumping into the waste collection room, namely, as an image sequence or video sequence. A data processing unit serves for analysis of the images of the first camera and/or the second camera. This analysis involves a classification of the images in terms of contents by means of a neural network. 
     In this way, it is possible to identify contents of the wastes with the aid of the first camera even prior to the emptying and to distinguish contaminants, i.e., unwanted contents not correctly sorted from permitted, i.e., correctly sorted contents and to take steps if necessary to prevent an emptying of the contents in the waste collection room. Thanks to the automatic analysis, this identification of contaminants can be done without observation and intervention by an attendant. For example, a dump stop can be carried out automatically when a contaminant is identified in the wastes based on the analysis of an image of the first camera. An appropriate warning signal, for example, can then be issued. In this way, it is possible to prevent a contamination of the wastes already present in the waste collection room. 
     If this is not the case, a contaminant can possibly be identified by the second camera during the dumping, i.e., while the wastes drop into the waste collection room. Even if a contaminating of the wastes already present in the waste collection room can no longer be prevented, it is possible to calculate or estimate the contaminant fraction inside the waste collection room and at least prevent the overall contaminated wastes inside a disposal vehicle from getting into the further waste cycle. A combination of using the first camera and the second camera can thus improve the recycling quality and the recycling quota. 
     The neural network can be, for example, a trained “convolutional neural network” (CNN). This can perform the classification of an image based on image features, and in the context of the present invention it may be enough to classify an image in terms of whether or not it contains a contaminant. A more precise classification is possible, such as identifying the precise type of the contaminant (like “PVC”) and a corresponding assignment of this to a particular contaminant class (like “plastics”) is conceivable, but not absolutely necessary. Neither does a specific object (like a beverage container) need to be recognized and identified. 
     According to a preferred embodiment of the present invention, the data processing unit is adapted to classify the images in terms of whether an image contains or does not contain at least one contaminant, and if a contaminant is present to identify the waste container whose contents are depicted as a contaminated one. 
     Further preferably, the data processing unit, in event of identifying a contaminated waste container based on an image recorded by the first camera, is adapted to relay a signal to the emptying device, by which a movement of this waste container to the emptying position is terminated or prevented. In this way, it can be prevented that the contents of a contaminated waste container get into the waste collection room and contaminate the already collected wastes. Thus, a dump stop will be carried out. This can also be carried out before the movement of the waste container from the receiving position begins, i.e., already with the receiving of the waste container. 
     Further preferably, the data processing unit is adapted to determine the fraction of contaminants of the contents of a contaminated waste container. This may be a volume fraction of these contents or—given a classification of the contaminants in relation to the other contents—a weight fraction. This information may be used to decide whether the contaminant fraction exceeds a certain limit value, and only if this limit value is exceeded will a corresponding warning signal, a report, or the like be generated. Such a signal can also be used to carry out the dump stop described above, i.e., only upon exceeding a predetermined contaminant fraction in a waste container will its emptying into the waste collection room be prevented. 
     According to another preferred embodiment, the data processing unit is adapted to determine, from the contaminant fractions determined for already completed emptying of multiple waste containers, a cumulative contaminant fraction of the contents of the waste collection room. In this embodiment, for example, the images of the contents of the waste container recorded by the second camera during the emptying can serve for determining the contaminant fraction of the contents of an individual waste container. This can lead to more precise results, since the contents of the waste container during the emptying can fall entirely through the visual field of the second camera, which is not the case with the first camera. Even if a dump stop for an individual waste container can no longer be carried out, it makes sense to determine a cumulative contaminant fraction in the disposal vehicle in order to judge the sorting purity and thus the quality of the collected wastes. Various steps can then be taken, depending on the ascertained quality. For example, the driver of a disposal vehicle can be told, when the cumulative contaminant fraction exceeds a limit value, to drive the disposal vehicle to a different utilization site than was originally planned. 
     This shall be explained on the example of the disposal of bio-waste. Compostable waste is generally a desirable content in this case, while other non-compostable fractions, especially plastics, metal, and so forth, are undesirable contaminants. Thus, if the images of the first camera in top view reveal that a contaminant such as metal or plastic is contained in a waste container, at least to an unjustifiable degree, this waste container will be identified as being contaminated. If this is the case already based on images of the first camera, a dump stop can be initiated, so that the contaminated waste is prevented from getting into the wastes of already completed emptying events already collected in the waste collection room. If this identification occurs only with the aid of images of the second camera, i.e., during the emptying, the contaminant fraction can be determined more precisely qualitatively with these images, and it is possible to determine the cumulative contaminant fraction in the waste collection room and thus the waste quality in terms of a possible recycling based on the total of emptying events performed for multiple waste containers. 
     According to another preferred embodiment of the present invention, that the data processing unit is adapted to determine, from the fraction of emptying of contaminated waste containers in the total number of emptying events already performed, a cumulative contaminant fraction of the contents of the waste collection room. Thus, in this embodiment, the determination of the cumulative contaminant fraction is based on the numerical fraction of contaminated emptying events out of their total number. For example, it is possible to determine, when a particular number of contaminated emptying events has occurred, that the degree of contamination of the contents of the waste collection room is so high that it must undergo a separate disposal. In this case, once again, a corresponding warning signal is put out to the crew of the disposal vehicle. 
     Further preferably, the disposal vehicle comprises identification means for determining an identifier of a waste container. Such identification means may be, for example, an antenna for reading out an RFID transponder which is mounted on the waste container and contains its identity or that of its owner in encoded form. This identification code corresponds to the identifier which is read out by the identification means. In this way, it is possible to identify each individual waste container and thereby coordinate its owner with a waste producer. 
     Further preferably, the disposal vehicle comprises means for determining its geographical location and for generating corresponding location data, and the data processing unit is adapted to correlate the location data with the identifier of a waste container. The location data may involve in particular GPS data, which accurately reflect the position of the disposal vehicle. The correlation with the identifier of a waste container then also makes it possible to determine the position of this container, namely, when the container is coupled to the disposal vehicle, i.e., when it gets for example into the receiving position of the emptying device of the vehicle. 
     According to another preferred embodiment of the present invention, the waste disposal system comprises a central data management unit and means for communication between the central data management unit) and the data processing unit of the disposal vehicle, wherein the data processing unit is adapted to send location data and correlated identifiers of waste containers together with the respective contaminant fractions of the contents of the waste containers to the data management unit, and the data management unit is adapted to determine a geographical density distribution of the contaminant fractions. As already mentioned, a correlating of the location data with the identifiers of the waste container can furnish information as to which containers are found in which position. This, in turn, can be correlated with the contaminant fractions of the contents of these containers. As a result, the data management unit can thus determine which containers with which contaminant fractions are located at which positions within a geographical territory, i.e., along the driving route of the disposal vehicle, for example, which carries out an emptying of various waste containers in succession along this route. 
     The geographical density distribution of the contaminant fractions represents a kind of “heat map”, which visualizes how the occurrence of contaminants is spatially distributed. This information can be used, for example, to identify geographical problem zones and to contact the owners of the waste containers, i.e., those causing the wastes, within these zones, for example in the form of informational or warning letters. Furthermore, it is also possible to contact individual parties causing waste separately. This is made possible by identifying waste containers with too high a contaminant fraction. The contaminant fraction can furthermore be included in the billing of the waste collection fees. 
     Further preferably, the data management unit is adapted to analyze images of the first camera and/or the second camera, this analysis involving a classification of the images in terms of identified contents by means of a further neural network. This may differ, e.g., in architecture and resource requirements from the neural network of the data processing unit of the disposal vehicle. It is also conceivable for the further neural network of the central data management unit to rely on a different set of training data, e.g., a more recent set, than the neural network of the data processing unit of the disposal vehicle or to incorporate attributes from other sources in the decision making. The additional analysis by the central data management unit serves for verification of the result of the analysis by the data processing unit of the disposal vehicle. 
     The invention moreover relates to a method for contaminant detection in waste containers, involving the following steps:
         receiving of a waste container by a disposal vehicle in a receiving position,   recording of at least one image of the contents of the waste container in the receiving position by a first camera in a top view,   moving of the waste container to an emptying position, in which the contents of the waste container are emptied into a waste collection room of the disposal vehicle, and recording of a sequence of images of the contents of the waste container during the emptying by a second camera,   analysis of the images of the first camera and/or the second camera, involving a classification of the images in terms of contents by means of a neural network.       

     Preferably, the images are classified in terms of whether or not an image contains at least one contaminant, and if a contaminant is present then the waste container whose contents are depicted is identified as a contaminated one. 
     Further preferably, in event of the identifying of a contaminated waste container based on an image recorded by the first camera a movement of this waste container to the emptying position is terminated or prevented. This corresponds to the dump stop described above, which prevents the contents of a contaminated waste container from getting into the contents of the already emptied waste containers in the waste collection room of the disposal vehicle. 
     Further preferably, the contaminant fraction of the contents of a contaminated waste container is determined. This may be, for example, a volume fraction or a weight fraction. This determination may also involve an estimation. 
     Further preferably, a cumulative contaminant fraction of the contents of the waste collection room is determined from the ascertained contaminant fractions of emptying events already performed for multiple waste containers. It can be determined in this case whether the cumulative contaminant fraction exceeds a limit value and in the event of such an exceeding of the limit value a corresponding signal is put out to the crew of the disposal vehicle. 
     Further preferably, a cumulative contaminant fraction of the contents of the waste collection room is determined from the fraction of emptying of contaminated waste containers out of the total number of emptying events already performed. 
     Further preferably, one identifier of a waste container is determined, by which the waste container is identified. This can be, for example, an identification by means of a RFID transponder, a corresponding RFID transponder being arranged on the waste container and an antenna for reading the signal of the RFID transponder being provided on the disposal vehicle. 
     Further preferably, the geographical location of the disposal vehicle is determined and location data corresponding to this geographical location are correlated with the identifier of the waste container. 
     Further preferably, location data and correlated identifiers of waste containers are sent along with the respective contaminant fractions of the contents of the waste containers to a central data management unit and a geographical density distribution of the contaminant fractions is ascertained. 
     Further preferably, the central data management unit performs an analysis of the images of the first camera and/or the second camera by means of a further neural network, involving a classification of the images in terms of identified contents, in order to verify the result of the analysis of these images by the neural network of the disposal vehicle. 
     The image or images will be saved in order to serve as proof of evidence for the contaminant. 
    
    
     
       In the following, preferred embodiments of the present invention will be explained more closely with the aid of the drawing. 
         FIG.  1    is a schematic representation of a disposal vehicle of one embodiment of the waste disposal system according to the invention in a side view; 
         FIG.  2    shows schematically an exemplary image of the first camera of the camera system of the disposal vehicle from  FIG.  1   ; 
         FIG.  3    is a further view of the disposal vehicle of  FIG.  1    in an emptying position of a waste container received on it; and 
         FIG.  4    is a flow chart to show one embodiment of the method according to the invention making use of a disposal vehicle per  FIGS.  1  and  3   . 
     
    
    
     The disposal vehicle  10  shown in  FIG.  1    is part of a waste disposal system according to the invention for contaminant detection in waste containers. The disposal vehicle  10  comprises on the inside a waste collection room  12  and at its rear (right side in  FIG.  1   ) an emptying device  14 , which is designed to receive a waste container  16  and move it into an emptying position.  FIG.  1    shows the receiving position of the waste container  16  in the emptying device  14 , in which the waste container  16  is suspended in usual manner with its edge on a receiver provided for this, such as a hook or the like of the emptying device  14 . For the moving of the waste container  16  from this receiving position ( FIG.  1   ) to the emptying position ( FIG.  3   ), the emptying device  14  has appropriate lifting means, which can be mechanically or hydraulically operated, for example. As an example, a disposal vehicle  10  is shown here as a rear-end loader, but the invention also allows the use of side loaders with no problem. Moreover, multiple emptying devices  14  can also be present for multiple waste containers  16 . 
     In the receiving position in  FIG.  1   , the waste container  16  stands basically upright and is opened. Above the waste container  16  there is arranged a first camera  18 , the visual field  20  of which is directed downward, so that the interior of the waste container  16  is surveyed. In this way, the first camera  18  can take a picture of the contents of the opened waste container  16  before performing the emptying. 
     One such picture is shown in  FIG.  2   . Wastes are present in the interior  22  of the waste container  16 , i.e., contents  24  which may be composed of various substances. These substances can be divided into different classes, namely, into at least permitted substances which can be recycled and substances representing contaminants, i.e., unpermitted substances. The term “permitted” shall refer to the fact that the respective substances have been properly sorted into a waste container  16  provided for this, so that they can be taken to a collection site provided for their recycling. The contaminants, on the other hand, are substances which have not been properly sorted and therefore cannot be recycled at the designated collection site. 
     For example, this will be explained with the aid of bio-waste. As is known, special compost bins exist for the collection of primarily compostable waste, generally known as bio-waste, and for its separation from other types of wastes, which are collected in other waste containers. Thus, bio-waste is a permissible content for a compost bin, while other wastes are contaminants. The contents  24  of the waste container  16  of  FIG.  2    consist predominantly of bio-waste  26 , however a foreign object is visible in the top view, namely a glass bottle  28 , for example, which represents a contaminant. 
     The disposal vehicle  10  comprises a data processing unit, not otherwise shown, for analysis of the images of the first camera  18 , wherein the analysis involves a classification of the images in terms of content by means of a neural network, in this instance, a convolutional neural network (CNN). In this way, the images of the first camera  18  can be classified in terms of content. The image of the first camera  18  from  FIG.  2    may be classified or assigned to the substance (contaminant) of “glass”, since the corresponding contaminant has been identified in it. But such a classification can also be limited to classifying the depicted image in terms of whether or not it contains a contaminant, without identifying the type of contaminant present (i.e., glass in this case). In this way, it is possible to recognize at least the existence of contaminants in the overall content of a waste container  16  in its receiving position at the emptying device  14 . 
     If an image is classified as containing at least one contaminant, the waste container  16  whose content  24  is depicted will be identified as contaminated. It is then possible to decide as to the further handling of this contaminated waste container  16 . For example, it is conceivable in the case of identifying a contaminated waste container  16  on the basis of the image registered by the first camera  18  to relay a signal by the data processing unit to the emptying device  14 , so that no movement of the contaminated waste container  16  into the emptying position will occur or will be prevented. In this way, the contaminated content  24 , containing contaminants, is prevented from getting into the wastes already present in the waste collection room  12  and becoming mingled with them. Instead, the emptying of the contaminated waste container  16  can be denied. The ending or preventing of the movement of the waste container  16  into the emptying position will also be termed a “dump stop”. 
     From the position in  FIG.  1   , the waste container  16  can be moved by the emptying device  14  into the emptying position shown in  FIG.  3   , in which the waste container  16  is tilted and its content  24  emptied into the waste collection room  12 . During the emptying, the content  24  falls freely into the waste collection room  12 . A second camera  30  arranged in the region of the emptying device  14  beneath the emptying position is adapted to take pictures of the content  24  of the waste container  16  during the emptying process, in particular a sequence of images, such as a video sequence. The images of the second camera  30 —like the images of the first camera  18 —can also be subjected by the data processing unit to an analysis by means of the neural network, so that the images of the second camera  30  are classified in terms of identified contents, i.e., permitted substances and contaminants. In this case as well, one or more images will be classified in terms of contents, and if the image or images contain a contaminant, the waste container  16  will be recognized as being contaminated and further handled accordingly. 
     The second camera  30  identifies in a recorded image sequence, e.g., the glass bottle  28  represented in  FIG.  2    as a contaminant in free fall during the emptying and the image or images of the second camera  30  are classified accordingly. Even if the content  24  of the contaminated waste container  16  has already gotten into the content  32  of emptying events already performed for previous waste containers inside the waste collection room  12 , the analysis of the images of the second camera  30  will be useful. These will serve for determining a cumulative contaminant fraction of the overall content  32  of the waste collection room  12  from the contaminant fraction of the content of a contaminated waste container  16  and the contaminant fractions of emptying events already performed for other waste containers. 
     These contaminant fractions may be, for example, volume fractions of the contaminant in the content  32 . This may be estimated from the images recorded, i.e., determined at least approximately. In some cases, an upper limit value may be set for a permitted cumulative contaminant fraction of the content  32  of the waste collection room  12 . If this limit value is exceeded, a signal may be sent to the crew of the disposal vehicle  12 , so that a decision can be made whether the content of the waste collection room  12  should be taken to a designated collection site, such as a composting plant for bio-waste, or to a different collection site, where the collected waste will be handled differently. 
     In some instances, the data processing unit is adapted to determine a cumulative contaminant fraction of the content of the waste collection room  12  from the fraction of emptying events of contaminated waste containers  16  out of the total number of emptying events already performed. 
     In this case, it is only determined how many contaminated waste containers have been emptied and this number is set in a ratio with the total number of emptying events already performed. From this, the degree of contamination of the content of the waste collection room  12  can be determined at least approximately. This procedure might be easier to carry out. 
     The disposal vehicle  12  moreover comprises means of determining its geographical location, namely, a GPS (Global Positioning System) receiver  34 , by which corresponding location data can be generated. The data processing unit is adapted to correlate these location data with the identifier of the waste container  16 . In this way, the location of a waste container  16  can be determined, as long as the location data have been associated with the identifier of a waste container  16  coupled to the disposal vehicle  10 . Furthermore, the location data and the identifier of a waste container  16  can be associated with data representing the contaminant fraction in the content  24  of a particular waste container  16 . The sites where waste containers  16  are located can thus be correlated with the contaminant fractions in their contents  24 . If the location data and correlated identifiers of waste containers  16  are relayed to a central data management unit, together with the respective contaminant fractions of the contents of the waste containers  16 , as can be done in the present waste disposal system, this central data management unit can determine a geographical density distribution of the contaminant fractions, i.e., it is possible to determine regions, for example, in which the contaminant fractions in the waste containers  16  positioned there are higher than in other regions. Thus, a kind of “heat map” of the contaminant fractions can be created and visualized. 
     Such a mapping of the contaminant fractions can serve for specific discussions with the waste producers in regions with elevated occurrence of contaminants in the contents of their waste containers  16 , i.e., to better inform them about waste separation or to warn them to carry out a better waste separation, perhaps by personalized letters. The images of the content  24  of the contaminated waste container  16  as recorded by the first camera  18  or the second camera  30  may be enclosed with the letters. 
     Thus, measures can be initiated, based on the mapping of the contaminant occurrence, to boost the quality of the wastes in terms of their recycling capability for useful substances. Other measures can also be considered, such as stricter checking of the waste containers  16  prior to the emptying. 
     The central data management unit may be outfitted to verify the result of the analysis of the images of the content  24  of a waste container  16  as recorded by the first camera  18  or the second camera  30  by a supplemental analysis. For example, if a waste container  16  is identified as being contaminated by the data processing unit of the disposal vehicle  10  by means of a first neural network on the basis of the analysis of an image of the first camera  18  (and/or multiple images of the second camera  30 ), the central data management unit  38  to which this image or these images have been relayed can undertake a further analysis by means of a second neural network, in order to verify the classification by the first neural network. The first neural network and the second neural network may be different from each other. Only in event of a positive verification, i.e., a confirmation of the result, will steps be taken, such as personalized letters, stricter inspections, or the like, so that a fine can be assessed through the memorized image and its matching up via the RFID with the citizen, i.e., the waste producer, or the citizen can be charged a fee for additional handling (sorting) of the wastes. 
     The contact between the data processing units which are installed in the disposal vehicles  10  of a fleet of the waste disposal system and a central data management unit which is stationary occurs in wireless manner, e.g., through known mobile radio standards. 
     The diagram in  FIG.  4    shows the flow of a method according to the invention for contaminant detection in waste containers with the aid of a waste disposal systems comprising the disposal vehicle  10  from  FIGS.  1  and  3   . 
     If a waste container  16  of a household  36  is placed in the receiving position of the emptying device  14  of the disposal vehicle  10 , the first camera  18  will take a picture of the content  24  of the waste container  16  (see  FIG.  2   ). The data processing unit of the disposal vehicle  10  analyzes this image of the first camera  18  and classifies it in terms of contents with the aid of a neural network, as described above. 
     If a contaminant  28  is contained in the image and the image of the first camera  18  is classified accordingly, the waste container  16  will be identified as being contaminated and a dump stop will be carried out (step S 110 ). No movement of the waste container  16  to the emptying position will be performed. Instead, the contaminant fraction of the contents  24  of the contaminated waste container  16  will be ascertained by the data processing unit of the disposal vehicle  10  and sent wirelessly, together with location data representing the geographical location of the disposal vehicle  10  with the waste container  16  received in it and a likewise ascertained identifier of the waste container  16  to a central data management unit  38  at a central station (HQ) (step S 120 ). 
     From the location data of various disposal vehicles  10 , the correlated identifiers of waste containers  16  and the contaminant fractions of the contents  24  of these waste containers  16 , the data management unit  38  can determine a geographical density distribution  40  of the contaminant fractions (step S 130 ). 
     Moreover, the individual waste producers, namely, the households  36  with which the waste containers  16  are associated, can be contacted individually by the central station, for example by means of a letter, and a positive or negative sanction can be imposed. For example, it is possible to provide the households  36  with additional information about proper waste separation, to warn them to improve their behavior in this regard, and so forth, possibly together with proof as to the contaminants  28  found in the contents  24  in the form of photos of the cameras  18  or  30  (step S 140 ). This can be done in automated manner by means of the data management unit  38 . 
     While the contents of a waste container  16  are being emptied into the waste collection room  12 , the second camera  30  can furthermore record images of the contents of the waste container  16 , as described above, and the contaminant fraction of the contents  24  of a contaminated waste container  16  can be determined by the data processing unit of the disposal vehicle  10 . An emptying of a contaminated waste container  16  may occur, e.g., if the contamination is not identified in the top view per  FIG.  2    by the first camera  18 , perhaps when a contaminant  28  is hidden in the contents  24  of the waste container  16 , and therefore no dump stop is triggered. 
     If multiple waste containers  16  are emptied in succession into the waste collection room  12 , it is possible to determine a cumulative contaminant fraction of the total contents of the waste collection room  12  from the ascertained contaminant fractions of these already performed emptying events of multiple waste containers  16  (step S 150 ). This cumulative contaminant fraction can be communicated by means of a display to the crew of the disposal vehicle  10 , so that they can respond, for example, when the cumulative contaminant fraction becomes too large, especially when it passes a given limit value. The cumulative contaminant fraction may be an indication of the percentage of contamination, for example. The crew can then decide whether to drive the disposal vehicle  10  to a given collection site, where the permissible contents will be used (e.g., a composting plant in the case of a collection of biological waste), or in the case of too high a cumulative contaminant fraction the contents of the waste collection room  12  will be handled alternatively, for example, in a trash incinerator. 
     The individual contaminant fractions of the contents of the waste containers  16  that are determined by images of the second camera  30  can also be correlated with the individual identifiers of the waste containers  16 , in order to match up the individual contamination of the waste container  16  with the waste producers, i.e., the households  36 . The identifiers of the waste containers  16  can be correlated with the location data of the disposal vehicle  10  and matched up in turn with the respective contaminant fractions of the waste container  16 . The data processing unit of the disposal vehicle  10  can then send the location data, the correlated identifiers of the waste containers  16 , and the respective contaminant fractions to the central data management unit  38 , similar to step S 120 . As already described above in connection with the first camera  18 , this can then individually contact the households  36  with which the waste containers  16  are associated and send out informational or warning letters, for example. 
     The central data management unit  38  can if necessary, subject the images sent to it from the first camera and/or the second camera  30  (together with the location data and the identifiers of the waste containers  16 ) to an additional analysis, in order to verify the result of the analysis of the data processing unit of the disposal vehicle  10 . For example, if the data processing unit of the disposal vehicle  10  analyzes an image of the first camera  18  (and/or multiple images of the second camera  30 ) by means of a first neural network and identifies a waste container  16  as being contaminated, this image of the first camera  18  (and/or the images of the second camera  30 ) will be sent to the central data management unit  38  (together with the location data and the identifiers of the waste containers  16  identified as being contaminated), and the central data management unit  38  will analyze this image of the first camera  18  (and/or the images of the second camera  30 ) by means of a second neural network, in order to verify the contamination of this waste container  16 , i.e., the result of the analysis of the first neural network. The first neural network and the second neural network may be different from each other. 
     Thus, both data of the first camera  16  and data of the second camera  30  can be used to evaluate the contaminant fractions so determined.