Method for operating a waste sorting installation

Abstract

The invention relates to a method for operating a waste sorting plant (1) which comprises a sorting device (11) which comprises at least one automatic sorting module (12a) which comprises a conveying device (13a) and at least one sensor (14a) with which at least one property of individual waste components of a waste stream (9) transported by the conveying device (13a) is detected.

Description

[0001] The invention relates to a method for operating a waste sorting plant according to claim 1.

[0002] DE 20 2016 003 285 U1 discloses a sorting module with a sorting device for separating mixed waste fractions, consisting of at least one carrier unit as a conveyor device, at least one receiving unit, at least one sorting unit, at least one discharge unit, and at least one drive unit. The sorting unit includes, as a sensor, at least one replaceable and / or expandable identification module for identifying the components of the mixed waste fraction. Further systems and methods for sorting and separating different recyclable materials, e.g., the use of several consecutive sorting modules, are known from DE 44 14 112 A1 and EP 1 030 740 B1.

[0003] The invention is based on the object of developing a method for operating a waste sorting plant by means of which it is possible, in particular, to optimize and in particular also to automate comparatively small waste sorting plants, with which, for example, up to 5,000 t / a are sorted, with regard to the number and quality of pure recyclable material fractions produced by sorting.

[0004] This object is achieved by the features of claim 1. Advantageous and expedient developments are specified in the subclaims.

[0005] According to the method according to the invention for operating a waste sorting plant, which comprises a sorting device with at least one automatic sorting module, a conveyor device and at least one sensor, wherein the sensor or at least one of the sensors is designed in particular as an optical sensor and preferably as an NIR sensor, with which at least one property of individual waste components of a waste stream transported by the conveyor device is detected, it is provided that the at least one sorting module of the sorting device is operated in an enrichment mode for outputting a first recyclable material mixed fraction such that recyclable materials such as in particular PET and / or HDPE and / or PP and / or PS and / or paper and / or FKN and / or films are separated from a remaining waste stream under the control of the at least one sensor, that the at least one sorting module of the sorting device is operated in a sorting mode for further processing the first recyclable material mixed fraction such that in a first sorting step, the first recyclable material mixed fraction is fed to the automatic sorting module or a further automatic sorting module and the first recyclable material mixed fraction is separated under the control of the at least one sensor into a first pure recyclable material fraction and into a further recyclable material mixed fraction,∘ that in at least one further sorting step, the further mixed recyclable material fraction produced in the previous sorting step is fed to the same automatic sorting module or to a further automatic sorting module and the further, second mixed recyclable material fraction is separated, controlled by the at least one sensor, into a further pure recyclable material fraction different from the first pure recyclable material fraction and into a further remaining mixed recyclable material fraction.

[0006] Because one sorting module of the sorting system is operated in both the enrichment mode and the sorting mode, or because several sorting modules are operated optionally in the enrichment mode and the sorting mode, mixed recyclable material fractions and a large number of pure recyclable material fractions can be produced using identical sorting modules. The method according to the invention thus enables effective and more versatile use of the sorting system and its sorting device or devices. A further advantage of such a method is that just one sorting module is sufficient to carry out this method, and with it a large number of different pure recyclable material fractions can be produced. A further advantage of such a method is that the sorting system can be scalable regardless of the mode, namely the enrichment mode and the sorting mode.

[0007] It can also be provided that data acquired by the at least one sensor in the enrichment mode is stored in a control device, wherein in the sorting mode, in the first sorting step or each further sorting step, a decision about the material to be separated as the first pure recyclable material fraction or further pure recyclable material fraction is made by the control device on the basis of the data acquired in the enrichment mode and / or data acquired in at least one sorting step, and wherein data acquired by the at least one sensor in each sorting step is stored in the control device. This makes it possible to automate the sorting sequence on the basis of the data acquired by the at least one sensor and thus also to optimize the sorting process.

[0008] It may also be provided that the waste stream undergoes a pretreatment stage before passing through the enrichment mode, in which individual recyclable materials, such as transparent LDPE and / or colored LDPE and / or cardboard and / or paper and / or ferrous metals and / or non-ferrous metals and / or waste materials, such as fines, are sorted out. This allows the waste stream to be freed of a significant number of contaminants before it enters a sorting module operating in the enrichment mode, allowing enrichment to take place more effectively.

[0009] Furthermore, it can be provided, in particular depending on the pure recyclable fraction to be sorted out or in particular depending on the composition of the mixed recyclable fraction supplied the sorting in the sorting module is either to be carried out in such a way that all recyclable materials that deviate from a recyclable material type of the pure recyclable material fraction are sorted out as a further mixed recyclable material fraction in such a way that the pure recyclable material fraction to be sorted out remains on the conveyor system, or the sorting in the sorting module is to be carried out in such a way that the pure recyclable material fraction is sorted out from the mixed recyclable material fraction and the mixed recyclable material fraction freed from the pure recyclable material fraction remains on the conveyor system as a further mixed recyclable material fraction.

[0010] This makes it possible to adapt the process to the proportion of pure recyclable material in the mixed recyclable material fraction, so that the sorting effort is as low as possible and can thus be carried out effectively and in a short time. This can be done depending on the pure recyclable material fraction to be sorted or, in particular, on the composition of the mixed recyclable material input, so that the sorting is always optimally adapted to the sorting task.

[0011] Furthermore, it is also possible to design the procedure in such a way that that the first mixed recyclable material fraction is temporarily stored in a bunker before a subsequent sorting step and / or that each further mixed recyclable material fraction is temporarily stored in the bunker or another bunker before a subsequent sorting step.

[0012] By temporarily storing the first mixed recyclable material fraction or at least one further mixed recyclable material fraction, it is possible to use the at least one sorting module of the sorting device flexibly for enrichment or sorting.

[0013] It is also intended to generate statistics on the composition of the generated mixed recyclable fraction in the enrichment mode based on the recorded data, and to plan and execute at least one sorting task, which is carried out in the at least one subsequent sorting mode, based on the statistics. This makes it possible to automatically adapt the waste sorting plant's operation to the composition of the waste stream that it exhibits in the at least one sorting module of the sorting device, and thus to react promptly and correctly to a changed composition of the waste stream.

[0014] Furthermore, it is planned to make a decision regarding the control of the waste sorting plant regarding which pure recyclable fraction should be separated in each sorting step based on the collected data and on defined rules, which in particular relate to a proportion of the pure recyclable fraction and / or a removal effort and / or an acute need and / or a value of the pure recyclable fraction. This makes it possible to automatically control the waste sorting plant according to requirements and thus operate it in an optimized manner.

[0015] It is also planned to sort out impurities manually and / or automatically before and / or after operation of the sorting module in enrichment mode in order to achieve an increased degree of purity and / or to sort out impurities manually and / or automatically before and / or after operation of the sorting module in the sorting mode in order to achieve an increased degree of purity.

[0016] This makes it possible to increase the quality of the pure recyclable fraction(s) produced in terms of the degree of purity.

[0017] Finally, the control system is designed to determine when each sorting module operates in enrichment mode and when each sorting module operates in sorting mode. This makes it possible to automatically control the waste sorting plant according to requirements and thus optimize its operation.

[0018] For the purposes of the invention, an NIR sensor is understood to be a sensor that operates on the basis of spectroscopy in the infrared light range.

[0019] In the context of the invention, a sensor is understood to be any sensor which enables an object- and / or substance-specific classification, particularly with regard to the material, and is thus suitable for sensor-based sorting. . If multiple sensors are used in a sorting device, they are either of the same type or of different types. The data collected by the sensor(s) is forwarded to the control device (KE).

[0020] For the purposes of the invention, each pure fraction of valuable materials is also referred to as a product.

[0021] Further details of the invention are described in the drawing using schematically illustrated embodiments.

[0022] This shows: Figure 1: a schematic representation of essential parts of a waste sorting plant with a first embodiment of a sorting device and Figure 2: a second embodiment of the Figure 1 shown sorting device.

[0023] In the Figure 1 To explain the method according to the invention, essential parts of a waste sorting plant 1 are schematically shown, wherein, for example, lightweight packaging waste 2 is sorted in the waste sorting plant 1. The lightweight packaging waste 2 is fed to the waste sorting plant 1 in bags 3, for example, by means of a wheel loader (not shown).

[0024] The bags 3 are opened by means of a bag opener 4, so that the lightweight packaging waste 2 can then pass through a pre-treatment stage 6 as the initial waste stream 5. The pre-treatment stage 6 comprises a plurality of modules (not shown) connected in series and / or parallel, such as separators and sieves, by means of which recyclable materials 7, for example transparent LDPE 7a and / or colored LDPE 7b and / or cardboard 7c and / or paper 7d and / or ferrous metals 7e and / or non-ferrous metals 7f and / or fines 7g, are sorted out from the waste stream 5 and stored in bunkers 8a-8g. In the pre-treatment stage 6, in addition to the fines 7g, other residual waste is also separated.

[0025] A waste stream 9 remaining after the pretreatment stage 6 is then conveyed directly or indirectly to a sorting device 11, with intermediate storage in a bunker 10. The sorting device 11, designed as the first embodiment, comprises an automatic sorting module 12a. The sorting device 11 comprises a conveyor device 13a, which is formed by a conveyor belt, and at least one sensor 14a, which in the exemplary embodiment is designed as an NIR sensor 15a. The sensor 14a records at least one property of individual waste components 16 of the remaining waste stream 9 transported by the conveyor device 13a as data. The conveyor device is designed, for example, as a conveyor belt or in another suitable manner.In principle, any sensor type that enables object- and / or material-specific classification and is thus suitable for sensor-assisted sorting can be used as sensor 14a. Of course, multiple sensors of the same or different sensor types can also be used. The data acquired by sensor 14a is forwarded to a control device KE.

[0026] First, the sorting module 12a of the sorting device 11 is operated in an enrichment mode (ARM) to discharge a first mixed recyclable material fraction 17. In this mode, a predetermined group of recyclable materials, such as PET and HDPE and PP and PS, is separated from a residual waste stream 18, which is conveyed into a bunker 19, under the control of the sensor 14a. The mixed recyclable material fraction 17 thus produced is conveyed into a bunker 20 provided for this purpose.

[0027] For further processing of the first mixed recyclable material fraction 17, the sorting module 12a of the sorting device 11 is then operated in a sorting mode SRM, which is also referred to as "batch sorting." In a first sorting step I, the first mixed recyclable material fraction 17 is fed to the automatic sorting module 12a. This is indicated by an arrow depicted with a dashed line. Accordingly, the first mixed recyclable material fraction 17 is separated into the first pure recyclable material fraction 21 and a further, second mixed recyclable material fraction 23 to produce a first pure recyclable material fraction 21, controlled by the sensor 14a. The first pure recyclable material fraction 21 is conveyed as the first product 22 into a bunker 24, and the further mixed recyclable material fraction 23 is conveyed into a bunker 25. The first product 22 comprises, for example, only PET waste.Which product is sorted out in the first sorting step I is determined by the control device KE before the start of the first sorting step I based on the data acquired in the enrichment mode ARM. The data acquired by the sensor 14a in the first sorting step I are forwarded to the control device KE.

[0028] For further processing, in a further, second sorting step II, the further, second mixed recyclable material fraction 23 produced in the preceding, first product sorting step I is fed to the same automatic sorting module 12a. This is indicated by an arrow shown with a dash-dotted line. There, to produce a second pure recyclable material fraction 27, the second mixed recyclable material fraction 23 is separated, controlled by the sensor 14a, into a further, second product 28 different from the second pure recyclable material fraction 27 and into a further, third remaining mixed recyclable material fraction 29. Here, the second pure recyclable material fraction 27 is conveyed as a second product 28 into a bunker 30, and the further, third remaining mixed recyclable material fraction 29 is conveyed into a bunker 31. The second product 28 comprises, for example, only HDPE waste.Which product is sorted out in the second sorting step II is determined by the control device KE before the start of the second sorting step II based on the data acquired in the enrichment mode ARM and the data acquired in the first product sorting step I. The data acquired by the sensor 14a in the second product sorting step II are forwarded to the control device KE.

[0029] The described process of further processing in the SRM sorting mode can be repeated with additional sorting steps until all desired products or pure recyclable fractions have been generated. This is indicated by an arrow with a dotted line. Accordingly, the waste sorting facility then includes additional bunkers for the products generated as pure recyclable fractions and for the mixed recyclable fractions. The further sorting steps are determined by the KE inspection facility based on the recorded data.

[0030] Furthermore, in order to increase the quality of the pure recyclable fractions or the products, it can be provided that the sorting device 11 is provided with a Figure 1 a manual sorting device (not shown) is installed upstream so that the quality of the waste stream supplied is initially increased and, as a result, the quality of the pure recyclable fractions or products is also increased.

[0031] Alternatively or additionally, in order to increase the quality of the products, it may also be provided that the sorting device 11 is provided with a Figure 1 A manual sorting device (not shown) is installed downstream, in which the quality of the respective discharged product or the quality of the respective discharged mixed recyclable material fraction is increased. In this case, an increase in quality is understood to mean an increase in the degree of purity. In an upstream manual sorting device, impurities are sorted out that are not intended to be part of the mixed recyclable material fraction fed to the sorting device. In a downstream manual sorting device, impurities are sorted out that do not correspond to the produced product or that are not intended to be part of the discharged mixed recyclable material fraction.

[0032] In the enrichment mode ARM, on the basis of the data detected by the sensor 14a, the control device KE generates statistics on the composition of the generated mixed fraction of valuable materials 17, 23, 29, and at least one sorting task, which is carried out in the respective subsequent sorting step I, II, is planned and carried out on the basis of the statistics.

[0033] A decision regarding the control of waste sorting plant 1 regarding which pure recyclable fraction should be separated in the respective sorting steps I and II is made based on the collected data and defined rules. These rules relate, for example, to a proportion of the pure recyclable fraction in the mixed recyclable fraction and / or a removal effort and / or an acute need and / or a value of the pure recyclable fraction.

[0034] At the waste sorting plant 1, the recorded data is transferred to the control device KE of the waste sorting plant 1. The control device KE determines when the sorting module 12a of the sorting plant 1 is operated in the enrichment mode ARM or in the sorting mode SRM.

[0035] In the Figure 2 A waste sorting plant 101 is shown. In contrast to the waste sorting plant 101 shown in the Figure 1In the waste sorting plant 1 shown, a sorting device 111 of the waste sorting plant 101, hidden as a second embodiment, comprises not just one sorting module, but three sorting modules 112a, 112b, and 112c. These are structurally identical, and each of the sorting modules 112a, 112b, and 112c comprises a conveyor device 113a, 113b, 113c and a sensor 114a, 114b, 114c, each of which is designed as an NIR sensor 115a, 115b, 115c. As in the first embodiment, the sensors 114a, 114b, 114c transmit their data to a control device KE.

[0036] The first sorting module 112a is operated in an enrichment mode ARM and the second sorting module 112b and the third sorting module 112c are operated in a sorting mode SRM.

[0037] In analogy to the Figure 1 A remaining waste stream 109 is fed to the first sorting module 112a, which, in analogy to the Figure 1in one in the Figure 2 pretreatment stage not shown.

[0038] The first sorting module 112a, which operates in enrichment mode ARM, separates a predetermined group of recyclable materials, such as PET and HDPE, and PP and PS, controlled by sensor 114a, from a residual waste stream 118, which is conveyed into a bunker 119. The resulting mixed recyclable material fraction 117 is fed directly to the second sorting module 112b. According to an alternative not shown, the feed can also be effected indirectly via an intermediate bunker.

[0039] The further processing of the first mixed recyclable material fraction 117 then takes place first in the second sorting module 112b and then in the third sorting module 112c.

[0040] In the second sorting module 112b, in a first sorting step I, the first mixed recyclable fraction 117 is separated into the first product 122 and a further, second mixed recyclable fraction 123 to produce a first pure recyclable fraction 121, controlled by the sensor 114a. The first product 122 is conveyed into a hopper 124, and the second mixed recyclable fraction 123 is fed to the third sorting module 112c. The first product 122 comprises, for example, only PET waste.

[0041] For further processing, in a second sorting step II, the further, second mixed recyclable material fraction 123 produced in the preceding, first sorting step I is fed to the third sorting module 112c. There, to produce a second pure recyclable material fraction 127, it is separated, controlled by the sensor 114a, into a further, second product 128, different from the first product 122, and into a third remaining mixed recyclable material fraction 129. The second product 128 is conveyed into a bunker 130, and the further, third remaining mixed recyclable material fraction 129 is conveyed into a bunker 131. The second product 128 comprises, for example, only HDPE waste.

[0042] If the first sorting module 112a is not operating or the mixed recyclable material fraction 117 generated thereby is conveyed into the above-mentioned, optionally present bunker, the third mixed recyclable material fraction 129 can be fed from the bunker 131 to the second sorting module 112b. In a third sorting step III, the second sorting module 112b then separates the third mixed recyclable material fraction 129, controlled by the sensor 114b, into a third product 133, different from the first product 122 and the second product 128, and into a fourth mixed recyclable material fraction 134 to generate a third pure recyclable material fraction 132. The third product 133 is conveyed into a bunker 135. The third product 133 comprises, for example, only PP waste.

[0043] For further processing, in a fourth product sorting step IV, the fourth mixed recyclable material fraction 134 produced in the preceding, third product sorting step III is fed to the third sorting module 112c. There, to produce a fourth pure recyclable material fraction 136, it is separated, controlled by the sensor 114c, into a fourth product 137, which is different from the first product 122, the second product 128, and the third product 133, and into a fifth remaining mixed recyclable material fraction 138. The fourth product 137 is conveyed to a bunker 139, and the further, fifth remaining mixed recyclable material fraction 138 is conveyed to a bunker 140. The fourth product 137 comprises, for example, only PS waste.

[0044] If one or more additional pure recyclable fractions are to be sorted out from the fifth mixed recyclable fraction 138, the second sorting module 112b and, if applicable, the third sorting module 112c can be run through again in the manner described. It is also conceivable for the first sorting module 112a to be temporarily operated in SRM sorting mode for this purpose. Likewise, in another case, it is also conceivable for all sorting modules to initially be operated in enrichment mode.

[0045] At the waste sorting plant 101, the recorded data is also transferred to the control device KE of the waste sorting plant 101. The control device KE determines when and how the individual sorting modules 112a, 112b, 112c of the sorting plant 101 operate in enrichment mode ARM or in sorting mode SRM.

[0046] According to further design variants, sorting systems with two sorting modules or with four or more than four sorting modules are also provided.

[0047] In the second embodiment, it can also be provided to operate the first sorting module temporarily in the SRM sorting mode or to operate at least two sorting modules in parallel in the ARM enrichment module. For such operating modes, the sorting system is then equipped with appropriate bunkers and conveyor lines.

[0048] In principle, all sorting systems with at least two sorting modules are designed to operate in series or parallel or partly in series and partly in parallel in different modes.

[0049] In the Figure 2 Two manual sorting devices 141, 142 are shown as examples, by means of which the quality of the produced products can be increased. List of reference symbols:

[0050] 1 Waste sorting plant 2 Lightweight packaging waste 3 Bag 4 Bag opener 5 Initial waste stream 6 Pre-treatment stage 7 Recyclable material 7a Transparent LDPE 7b Colored LDPE 7c Cardboard 7d Paper 7e Ferrous metal 7f Non-ferrous metal 7g Fines 8a-8g Bunker 9 Remaining waste stream 10 Bunker for 9 11 Sorting device (first design variant) 12a Automatic sorting module 13a Conveyor device 14a Sensor 15a NIR sensor 16 Waste component 17 First mixed recyclable material fraction 18 Remaining waste stream 19 Bunker for 18 20 Bunker for 17 21 First pure recyclable material fraction 22 First product 23 Further, second mixed recyclable material fraction 24 Bunker for 22 25Bunker for 23 26(not occupied) 27Second pure recyclable fraction 28Second product 29Third remaining mixed recyclable fraction 30Bunker for 28 31Bunker for 29 112a-112cSorting module 101Waste sorting plant 111Sorting device (second design variant) 113a-113cConveying device 114a-114cSensor 115a-115cNIR sensor 109Remaining waste stream 118Remaining waste stream 119Bunker for 118 117First mixed recyclable fraction 121First pure recyclable fraction 122First product 123Second mixed recyclable fraction 124Bunker for 122 127Second pure recyclable fraction 128Second product 129Third mixed recyclable fraction 130Bunker for 128 131Bunker for 129 132Third pure recyclable fraction 133Third product 134Fourth Recyclable mixed fraction 135Bunker for 133 136Fourth recyclable pure fraction 137Fourth product 138Fifth recyclable mixed fraction 139Bunker for 137 140Bunker for 138 141, 142Manual sorting device ARM Enrichment mode SRM Sorting mode KE Control device I-IVirst to fourth sorting step

Claims

1. Method for operating a waste sorting plant (1, 101) comprising: - a sorting device (11, 111) comprising at least one automatic sorting module (12a; 112a-112c) comprising a conveying device (13a; 113a-113c) and at least one sensor (14a; 114a-114c) which is used to capture at least one property of individual waste components of a waste stream (9; 109) transported by the conveying device (13a; 113a-113c), - wherein, in order to apply a first mixed recyclable material fraction (17; 117), the at least one sorting module (12a; 112a) of the sorting device (11; 111) is operated in an enrichment mode (ARM) in such a way that recyclable materials such as in particular PET and / or HDPE and / or PP and / or PS and / or paper and / or FKN and / or films are separated from a remaining waste stream (18; 118) in a manner controlled by the at least one sensor (14a; 114a), - wherein, in order to treat the first mixed recyclable material fraction (17; 117) further, the at least one sorting module (12a; 112b) of the sorting device (11; 111) is operated in a sorting mode (SRM) in such a way ∘ that, in a first sorting step (I), the first mixed recyclable material fraction (17; 131) is fed to the automatic sorting module (12a) or to another automatic sorting module (112b) and the first mixed recyclable material fraction (17; 117) is separated into a first pure recyclable material fraction (22; 122) and into a further mixed recyclable material fraction (23; 123) in a manner controlled by the at least one sensor (14a; 114b), ∘ that, in at least one further sorting step (II), the further mixed recyclable material fraction (23; 123) produced in the previous sorting step (I) is fed to the same automatic sorting module (12a) or another automatic sorting module (112c) and the further, second mixed recyclable material fraction (23; 123) is separated into a further pure recyclable material fraction (28; 128) different from the first pure recyclable material fraction (22; 122) and into another remaining mixed recyclable material fraction (29; 129) in a manner controlled by the at least one sensor (14a; 114c).

2. Method according to Claim 1, characterized in that, in the enrichment mode, data captured by the at least one sensor (14a; 114a) are stored in a control device (KE), wherein, in the sorting mode (SRM) in the first sorting step (I) or a further sorting step (II), a decision is made on the material, which is separated as the first pure recyclable material fraction (21; 121) or a further pure recyclable material fraction (27; 127), by the control device (KE) on the basis of the data captured in the enrichment mode (ARM) and / or data captured in at least one sorting step (II), and wherein, in each sorting step, data captured by the at least one sensor (14a; 114b) are stored in the control device (KE).

3. Method according to Claim 1, characterized in that, before passing through the enrichment mode (ARM), the waste stream (5) passes through a pre-treatment stage (6) in which individual recyclable materials (7; 7a-7f) such as in particular transparent LDPE and / or coloured LDPE and / or cardboard and / or paper and / or ferrous metals and / or non-ferrous metals and / or waste materials such as in particular fines (7g) are sorted out.

4. Method according to Claim 1, characterized in that, in particular depending on the pure recyclable material fraction (22, 28; 122, 128, 133, 137) to be sorted or in particular depending on the composition of the mixed recyclable material fraction (17; 117) supplied, - the sorting in the sorting module (12a; 112b, 112c) is carried out either in such a way that all recyclable materials differing from a recyclable material type of the pure recyclable material fraction (22, 28; 122, 128, 133, 137) are sorted as a further mixed recyclable material fraction (23, 29; 123; 129, 134, 138) in such a way that the pure recyclable material fraction (22, 28; 122, 128, 133, 137) to be sorted remains on the conveying device (13a; 113b, 113c) or - the sorting in the sorting module (12a; 112b, 112c) is carried out in such a way that the pure recyclable material fraction (22, 28; 122, 128, 1333, 137) is sorted from the mixed recyclable material fraction (23, 29; 123, 129, 134, 138) and the mixed recyclable material fraction (23, 29; 123; 129, 134, 138) liberated from the pure recyclable material fraction (22, 28; 122, 128, 1333, 137) remains on the conveying device (13a; 113b, 113c) as a further mixed recyclable material fraction (29; 129, 134, 138).

5. Method according to at least one of the preceding claims, characterized - in that the first mixed recyclable material fraction (17; 117) is temporarily stored in a bunker (20) before a subsequent sorting step, and / or - in that each further mixed recyclable material fraction (23, 29; 123, 129, 134, 138) is temporarily stored in the bunker or a further bunker (25, 31; 131, 140) before a subsequent sorting step.

6. Method according to at least one of the preceding claims, characterized in that, in the enrichment mode (ARM), statistics on the composition of the produced mixed recyclable material fraction (17, 23, 29; 117, 123, 129, 134, 138) are generated by the control device (KE) on the basis of the captured data, and at least one sorting task, which is executed in the at least one subsequent sorting mode (SRM), is planned and executed on the basis of the statistics.

7. Method according to Claim 6, characterized in that a decision on the control of the waste sorting plant (1; 101), as regards which pure recyclable material fraction (22, 28; 122, 128, 133, 137) is intended to be separated in the respective sorting step, is made on the basis of the data stored by the control device (KE) and on the basis of rules which are defined in the control device (KE) and concern in particular a proportion of the pure recyclable material fraction and / or a removal effort and / or an acute need and / or a value of the pure recyclable material fraction.

8. Method according to at least one of the preceding claims, characterized - in that, before and / or after operation of the sorting module in enrichment mode (ARM), contaminants are sorted manually and / or automatically in order to achieve an increased degree of purity, and / or - in that, before and / or after operation of the sorting module in sorting mode (SRM), contaminants are sorted manually and / or automatically in order to achieve an increased degree of purity.

9. Method according to at least one of the preceding claims, characterized in that the control device (KE) determines when the sorting module (12a; 112a-112c) operates in the enrichment mode (ARM) and when the sorting module (12a; 112a-112c) operates in the sorting mode (SRM).

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