PROCEDURE AND SETUP FOR CLEANING AND REUSED WASH WATER PRIOR TO A SORTING PROCESS OF PLASTIC AND / OR METAL WASTE

Abstract

The present invention relates to a method and a device for the purification of wash water resulting from a sorting process of plastic and / or metal waste, comprising the steps of: washing the plastic and / or metal waste with wash water in a washing plant, collecting the wash water in a collection tank resulting from the washing, and purifying the wash water resulting from the collection in a purification plant, where the purification of the collected wash water comprises the step of sieving, where contamination is separated from the collected wash water during sieving, where sieved wash water is collected in a first resting tank, where the sieved wash water collected in the first resting tank is decanted from the first resting tank, and where purified wash water is reused during the step of washing the plastic and / or metal waste with wash water.

Description

2 The present invention aims to find at least one solution to some of the above-mentioned problems or disadvantages. SUMMARY OF THE INVENTION 5 In a first aspect, the present invention concerns a method according to claim 1. This method has the advantage, among others, that the purification and reuse of wash water from the washing of plastic and / or metal waste prior to a sorting process offers improved circularity of the wash water. This helps to reduce environmental impact and the need for water as a raw material. Moreover, the use of additives such as detergents, bacteria, flocculants, or anti-foaming agents is minimized by the above method. Preferably, the method should be applied to plastic and / or metal waste originating from ASR (Auto Shredder Residue), WEEE (Waste Electronic and Electrical Equipment), or bottom ash from an incinerator, where a wide variety of contamination may be present in the wash water. The wide variety and highly fluctuating degree of contamination can be easily managed by the method.described in this document. 20 Preferred forms of the method are set out in conclusions 2 to 8. In a second aspect, the present invention concerns a facility in accordance with conclusion 9.25 This facility has the advantage, among other things, that the facility offers improved circularity of the wash water for the contamination and reuse of wash water from the washing installation for washing plastic and / or metal waste prior to a sorting process. This helps to reduce environmental impact and the consumption of water as a raw material. Preferably, the facility should be used for plastic and / or metal waste originating from ASR, WEEE, or bottom ash from an incinerator, where a wide variety of contamination may be present in the wash water. The wide variety and highly fluctuating degradation of contamination can be easily captured by the first settling tank and collection tank as described for the facility. BE2024 / 5868 3 Preferred forms of organization are described in the following conclusions 10 to 17.In one third aspect, the present invention concerns a use in accordance with claim 18. 5 This use results in an advantageous separation of contamination in the wash water for waste streams originating from ASR, WEEE or bottom ash from an incinerator. DESCRIPTION OF THE FIGURES10 Figure 1 shows a flowchart of a method according to an implementation form of the present invention. Figure 2 shows a flowchart of a method according to another implementation form of the present invention. Figure 3 shows a flowchart of a method according to a further implementation form from Figure 2. 20 Figure 4A shows a perspective view of a washing drum according to an implementation form of the present invention. Figure 4B shows a detailed representation of a spiral enclosed in the washing drum from Figure 4A. 25 DETAILED DESCRIPTION The cleaning and reuse of wash water from the washing of plastic and / or metal waste prior to a sorting process offers various advantages, 30 including improved circularity of the wash water, a lower environmental impact,a reduced burden on any further biological or physicochemical water treatments and a lower economic cost. Preferably, the method should be applied to plastic and / or metal waste originating from ASR (Automotive Shredder Residue), WEEE (Waste Electronic and Electrical Equipment) or bottom ash from an incineration plant, where a wide variety of contamination may be present in the wash water. The wide variety and highly fluctuating degradation of BE2024 / 5868 4 contamination in the wash water can be easily managed by the methods and the setup described in this document. Unless otherwise defined, all terms used in the description of the invention, including technical and scientific terms, have the meaning as they are generally understood by the expert in the technical field of the invention. For a better assessment of the description of the invention, the following terms are explicitly explained. “A”, “the” and “a” in this document refer to both the singular and theplurals on the side context clearly assumes otherwise. For example, “a segment” means one or more than a segment. The use of “first”, “second”, “third”, and so on before a term has no indication of order, but serves merely to indicate a difference between several of the same overarching term. Citing numerical intervals by the endpoints includes all integers, fractions and / or real numbers between the endpoints, including these endpoints. 20 In the context of this document, 'wash water' is a term for water used during the washing of plastic and / or metal waste in a washing plant. The wash water undergoes purification steps before being reused for washing plastic and / or metal waste, as a result of which wash water can comprise different compositions and / or degrees of contamination. These different compositions and / or degrees of contamination are indicated by adjectives added to the term 'wash water'. Furthermore, 'contamination' includes, among other things, fibers, sands, and particles.In a first aspect, the invention concerns a method for the contamination of wash water prior to a processing process of plastic and / or metal waste. Preferably, the processing process of the plastic and / or metal waste is a sorting process. 35 The method comprises the steps of: BE2024 / 5868 5 - washing the plastic and / or metal waste with wash water in a washing installation, - collecting the wash water resulting from the washing, and - contaminating the wash water resulting from the collection. 5 In one implementation form, the purification of the collected wash water comprises the sieving step. During sieving, contamination is separated from the collected wash water. Sieved wash water is collected in a first settling tank. The sieved wash water collected in the first settling tank is decanted from the first settling tank. 10 In one implementation form, the wash water originating from purification is reused in the step of washing the plastic and / or metal waste. The purification and reuse of wash water from the washing of the plastic and / or 15Using metal waste prior to a sorting process offers various benefits, including improved circularity of the wash water, a lower environmental impact, a reduced burden on any further biological or physicochemical water treatments, and a lower economic cost. This helps to reduce the environmental impact and the need for water as a raw material. In one implementation form, the sieving step comprises a sub-step in which the collected wash water is sieved by means of a first sieve. The first sieve removes fibers and solid particles from the collected wash water. To this end, the collected wash water passes through pores of the first sieve. The fibers and solid particles are retained by the first sieve. The fibers and solid particles are separated from the first sieve. Removing the fibers and solid particles from the collected wash water ensures that contamination with an aspect ratio greater than one and with a diameter smaller than the pores of the first sieve is removed from the sieved wash water. The fibers and solid particles can originate from, among other things, theGranulation of plastic and / or metal waste, wood fibers, textile fibers, copper wires, and the like originating from, among others, ASR, WEEE, or bottom ash. The removal of the fibers and solid particles results in fewer to no obstructions during the further cleaning of the collected wash water. BE2024 / 5868 6 In one design form, the first sieve is a drum sieve. The collected wash water is introduced into the drum sieve by an inlet from the core of the drum sieve, through pores of the sieve, and pressed against a casing of the drum sieve. Preferably, the sieved wash water flows along the casing, where the sieved wash water is collected. 5 The drum sieve is advantageous as the first sieve due to the tangential filtration through the first sieve. The change in flow at the sieve surface of the first sieve ensures that there is no build-up of contaminants on the sieve surface and that this sieve capacity is maintained. Preferably, the outside of the sieve surface is cleaned using spray nozzles, preferably under high pressure. Moreover, orienting fibers and solid particles through theTangential filtration occurs transversely to the screen surface of the first screen, whereby they are separated more effectively. Alternatively, a vacuum drum filter can be used as the first screen.15 In one design, the fibers and solid particles are transported out of the first screen by means of spirals. The spirals are preferably placed against the casing of the drum screen. The drum screen is preferably rotated, whereby the fibers and solid particles are transported by the spirals to an end20 of the drum screen opposite the inlet. In one design, an anti-foaming agent is added prior to the first sieve. This prevents foam formation from causing one or more rest tanks to overflow.25 In one design, the sieving step comprises a sub-step in which particles with a higher density than water are separated from the collected wash water. Preferably, the collected wash water is fiber-free. For this purpose, this design can be advantageously combined with a previously 30described execution form in which the collected water is sieved using a first sieve. This is advantageous because the fibers and solid particles do not interfere with the separation of the said particles. The said particles are, for example, sand or other sediments. The wash water from which the said particles have been separated is collected in the first settling tank.35 BE2024 / 5868 7 Removing the particles from the collected wash water ensures an increase in the purity of the wash water. Moreover, it reduces abrasion on the washing installation caused by the particles during washing, resulting in the washing installation showing less wear and tear, which also makes less maintenance necessary. Furthermore, removing the particles prevents wear on pumps or other parts within a facility. Moreover, the particles will not be reintroduced into the washing installation, so that there is no an increase in particle concentration occurs. In a further form, the separated particles are sieved using a second sieve to separate the residual wash water from theseparated particles. The remaining wash water is collected in the first resting tank. This is advantageous because a larger proportion of wash water can be reused, thereby reducing total water consumption. In one design, particles with a higher density than water are separated from the collected wash water by centrifugation, preferably by a hydrocyclone. The said particles with remaining wash water are discharged onto the second sieve through a drain at the bottom of the hydrocyclone. The wash water from which the particles have been separated flows along an overflow from the hydrocyclone to the first resting tank. By centrifugation, preferably by hydrocyclones, large flow rates can be processed efficiently at high speed. Furthermore, maintenance of hydrocyclones is generally simple because they contain no moving parts.25 Moreover, hydrocyclones can handle a wide range of flow rates. This allows the hydrocyclone to handle a large variation in particle contamination in the collected wash water. In one design, residual wash water is separated by means of a third sieve.30separated from the plastic and / or metal waste. The remaining wash water is carried away from the washing installation by the plastic and / or metal waste. The remaining wash water flows through the third sieve. The plastic and / or metal waste is transported over a sieve surface of the third sieve. Preferably, the third sieve is a vibrating sieve. More preferably, the vibrating sieve comprises two compartments with a different vibration frequency for the two compartments. BE2024 / 5868 8 As much wash water as possible is recovered through the third sieve. The recovered wash water is combined with the collected wash water. In a preferred design form, screened wash water flows from the first settling tank into a second settling tank. From the second settling tank, the cleaned wash water is reused for washing the plastic and / or metal waste. Preferably, the cleaned wash water is stored in the second settling tank. Due to the overflow, a higher purity can be obtained for the cleaned wash water, given that partial sedimentation of fine particles is still possible in the first settling tank.additionally, the second settling tank serves as a buffer to absorb fluctuations in the volume of the cleaned wash water. In one configuration, the collected fiber-free wash water flows to the first sieve and the settling tank. The third settling tank serves as a buffer for further cleaning steps of the collected wash water. Preferably, the collected fiber-free wash water is pumped from the third settling tank to separate particles with a higher density than water, as in previously described configurations. In one configuration, spilled wash water is collected during the process on a non-water-permeable surface, gathered in a buffer, and added to the resting tank. Preferably, the spilled water is collected in a gutter in the non-water-permeable surface. This configuration is advantageous because it limits losses of process water, including wash water, to achieve the highest possible efficiency for the reuse of water as, among other things, wash water for washing the plastic and / or metal waste.In one implementation form, the method additionally includes the step of settling the sludge after the screening step. The settling of the sludge comprises the steps of: -flowing the screened wash water over lamellae in a lamella separator,30 -retaining the fine particles by the lamellae, -settling the fine particles along the lamellae to form sludge, -decanting the screened wash water over the lamellae, whereby water is separated from the screened wash water and the sludge, and -flowing the decanted water into a water tank.35 The screened water preferably exits the first stone / or the second settling tank. BE2024 / 5868 9 Preferably, a flocculant is added to the sieved wash water, causing fine particles to agglomerate. This is beneficial for the settling of the fine particles. Preferably, the flocculant is mixed with the sieved wash water in a mixing tank by means of agitators. The sieved wash water preferably has a minimum residence time of 1 hour in the mixing tank, preferably 2 hours, almost 3 hours, and 4 hours. The agitators rotate atpreferably at a maximum speed of 200 revolutions per minute, preferably 100 revolutions per minute, almost even more preferably 75 revolutions per minute, and preferably 50 revolutions per minute. This is advantageous because the flakes formed by this are not broken up again by the stirring elements. The settling of the sludge from the screened wash water allows for a higher degree of purity of the collected wash water to be achieved. As a result, the water from the water tank can be used for cleaning purposes, such as rinsing a filter or a screen, like a belt press filter, or for cleaning the washing installation. In addition, it reduces wear and obstructions on pumps and pipes by removing abrasive particles. Furthermore, the settling of the sludge improves the clarity and quality of the screened wash water, which is essential for the efficient cleaning of plastic and / or metal waste. The water from the water tank can be added back to the first or second settling tank, so that if there is still insufficient water present in the settling tanks thiscan be supplemented, or if a higher purity is required for washing the plastic and / or metal waste, the purity of the screened water in the first and / or second settling tank can be increased. In one configuration, only a portion of the screened wash water from the first and / or second settling tank is pumped to the lamella separator to allow the sludge to settle. This is to obtain different gradations of purity or contamination of the wash water in various steps of the washing of the plastic and / or metal waste. These different gradations of the wash water further allow for a flexible and rapid response to varying loads caused by varying contamination of the wash water. A remaining portion of the screened water from the first and / or second settling tank is pumped to a washing installation for washing the plastic and / or metal waste. BE2024 / 5868 10 In a further form of execution, the step of settling the sludge comprises the additional steps of: adding the sludge from the lamella separator toa buffer tank, and the suspension of the sludge from the lamella separator, preferably by means of moving mixing elements in the buffer tank. The suspension of the sludge in the buffer tank serves as a buffer for the further processing and separation of the sludge from the screened wash water. By keeping the sludge in suspension, premature maintenance on the buffer tank is avoided. In one implementation form, the settling of the sludge in the lamella separator includes the additional step of scraping off and removing foam present on a free water surface of the lamella separator. This prevents overflow of the foam into the water tank. This avoids contamination of the water by the foam. The foam from the water surface is preferably added to the buffer tank. 15 In one implementation form, the method includes the additional step of pressing a filter cake out of the sludge. Alternatively, a decantation centrifuge is used to dewater the sludge. Flottweg is a non-exhaustive example of a manufacturer ofsuitable decantation centrifuges. Screened wash water remaining in the sludge is separated from the filter cake. The said sludge originates from the lamella separator20 and / or the buffer tank. The remaining screened wash water flows to the first resting tank. This is beneficial for the highest possible efficiency when reusing wash water during the washing of plastic and / or metal waste. 25 In a further processing form, a dewatering additive is added to the sludge before pressing and, if applicable, after the sludge has been suspended in the buffer tank. This further agglomerates the sludge so that the remaining wash water can be removed from the sludge more easily. Preferably, the sludge with dewatering additive is added to a mixing tank where the sludge and the dewatering additive are mixed. From the mixing tank, the sludge with dewatering additive goes to pressing. In one processing form, the sludge is pressed between at least two belts. The at least two belts are moved between and over a series of rollers.35As a result, the remaining screened wash water is pressed out of the sludge. Preferably, the filter cake is scraped off the belts at the end of the rolling series. At BE2024 / 5868 11, the belts are preferably rinsed with water from the water tank in preparation for pressing fresh sludge. Because fresh sludge can be fed continuously, filter cake is continuously removed from at least two belts, and the remaining screened wash water can flow away to the first settling tank, the remaining screened wash water is pressed out of the sludge in an efficient manner.5 In a preferred implementation form, at least the combination of washing the plastic and / or metal waste, collecting the wash water, screening with removal of fibers from the collected wash water, collecting the screened wash water, and decanting the cleaned wash water from the first settling tank is combined with the separation of the particles with a density greater than water from the fiber-free wash water to the fiber-free and particle-free wash water, the settling of the sludge from the fiber-free and particle-freewash water, decanting the water during sludge settling, re-adding cleaned wash water to the washing plant and adding15 of the water to the washing plant. The steps are preferably performed for the cleaned wash water in the order: washing the plastic and / or metal waste, collecting the wash water, sieving with removal of fibers from the collected wash water, separating particles with a density greater than water from the fiber-free wash water into the fiber-free and particle-free20 wash water, collecting the sieved wash water and decanting the cleaned wash water from the first settling tank and re-adding cleaned wash water to the washing plant. Preferably, after collecting the sieved wash water and decanting the cleaned wash water from the first settling tank, the settling of the sludge from the25 is also performed simultaneously with the previous steps. fiber-free and particle-free wash water, the decanting of the water during sludge settling, and the addition of the water to the washing installation carried out.In a design, the plastic and / or metal waste is washed in a washing drum. The washing drum comprises driven rollers, a casing, an injector, paddles and a spiral. The washing of the plastic and / or metal waste comprises the steps of: -bringing the wash water together with the plastic and / or metal waste into a 35 injector, BE2024 / 5868 12 -introducing the wash water and the plastic and / or metal waste into a casing of a washing drum by means of the injector, -rotating the casing on driven rotating rollers, -carrying the plastic and / or metal waste and a portion of the wash water upwards along the casing by a spiral which is fixedly attached to an inner wall of the casing, whereby the upward lifting is carried out by, among other things, paddles which are positioned between successive windings of the spiral, -the falling of the plastic and / or metal waste and a portion of the wash water downwards into the remaining portion of the wash water,10 -repeating the taking up and the falling down of theplastic and / or metal waste and part of the wash water by moving the plastic and / or metal waste within the casing, -removing the wash water and contamination through openings contained in the casing, and15 -removing the plastic and / or metal waste from the washing drum. Preferably, the wash water is cleaned wash water as in previously described versions. 20 In one execution form, the washing of the plastic and / or metal waste includes the additional step of rinsing the plastic and / or metal waste using a spray nozzle. The plastic and / or metal waste is preferably rinsed with cleaned wash water. Preferably, the rinsing step is repeated during the movement of plastic and / or metal waste through the casing. 25 Preferably, the plastic and / or metal waste is rinsed at most three times inside the casing. This is beneficial for removing adhering contamination from the plastic and / or metal waste. Moreover, water can be added to the wash water to dilute the contamination. This furthercleaning and transport of the wash water simplified.30 In one design form, the washing of the plastic and / or metal waste includes the additional step of filtering the wash water through a filter contained in openings of the casing. Preferably, the filtering step is repeated during the movement of plastic and / or metal waste through the casing.35 Preferably, filtering is performed a maximum of seven times in one casing, plus a maximum of five times, plus a maximum of three times. This allows the plastic and / or metal waste to be easily separated from the wash water. In a further implementation form, the washing of the plastic and / or metal waste includes the additional step of vacuum-cleaning the filter with water5 on the outside of the casing. Preferably, the water is collected together with the wash water. This keeps the pores of the filter clear for continuous operation of the filter. Moreover, as much water as possible is reused as wash water. 10 In a second aspect, the invention concerns a device for the purification of wateroriginating from a processing process of plastic and / or metal waste. Preferably, the processing process is a sorting process. 15 The installation comprises: -a washing installation for washing the plastic and / or metal waste with wash water, -a collection tank for collecting the wash water originating from the washing installation, and 20 -a cleaning installation for cleaning the collected wash water. In a specific configuration, the cleaning installation comprises one or more sieves for sieving the collected wash water to remove contamination from the collected wash water. 25 The cleaning installation comprises a first settling tank for collecting and storing sieved wash water. The first settling tank comprises a decanting opening for decanting the sieved wash water from the first settling tank to obtain cleaned wash water. 30 The cleaning installation comprises a return line for returning cleaned wash water to the washing installation. The facility for the contamination and reuse of wash water from the 35 washing installation for washing plastic and / or metal waste that is contaminatedprior to a sorting process, this offers improved circularity of the BE2024 / 5868 14 wash water. This helps to reduce environmental impacts and the consumption of water as a raw material. It also results in a reduced burden on any further biological or physicochemical water treatments and a lower economic cost. Preferably, the facility should handle plastic and / or metal waste originating from ASR, WEEE, or bottom ash from an incinerator, where a wide variety of contamination may be present in the wash water. The wide variety and highly fluctuating degradation of contamination can easily be captured by the first settling tank and collection tank as described for the facility. 10 In one design form, the cleaning installation comprises a first sieve for removing fibers and solid particles from the collected wash water. The first sieve is a drum sieve. The first sieve comprises an inlet for introducing the collected wash water onto the first sieve. The first sieve comprises a sieve surface with pores for retaining the fibers and solid particles from the collected 15wash water. The first sieve comprises a first drain and a second drain, respectively, for removing the fibers and solid particles from the first sieve and for removing the screened wash water from the first sieve. In one design form, the first sieve comprises spirals for removing the fibers and solid particles against the filter. This allows the fibers and solid particles to be scraped off and transported to the second drain. Preferably, the first sieve also comprises spray nozzles for clearing the sieve surface on the outside of the drum sieve. The device preferably comprises a pump for spraying water under high pressure through the spray nozzles. In one design form, the pores have a cross-section of 50-1000µm. Preferably, the pores have a cross-section of 100-800µm, more preferably 150-600µm. This allows fibers, but also additionally coarser solid particles, to be retained from the collected wash water. In one design form, the drum sieve has a length between 1 and 4 m. Preferably, the length is at least 1 m, more preferably at least 1.3 m, more atpreferably at least 1.8 m. Preferably the length is at most 4 m, but preferably at most 3.5 m, but preferably at most 3 m. This provides sufficient length for the collected wash water to flow through the filter and retain the fibers and solid particles. Moreover, the length is long enough to remove the fibers and solid particles via tangential filtration. In one configuration, the cleaning installation comprises a hydrocyclone for separating particles with a density higher than water from the collected wash water. Preferably, the collected wash water is also fiber-free and originates from the first sieve. Particles with a density higher than water are, for example, sand or other sediments. The hydrocyclone comprises an inlet for introducing the collected wash water into the hydrocyclone. The hydrocyclone comprises a first outlet and a second outlet, respectively, for removing particle-free wash water to the first settling tank and for removing the said particles with residual wash water from the hydrocyclone.The hydrocyclone allows large flow rates to be processed efficiently at high speed. Furthermore, maintenance of hydrocyclones is generally simple because the hydrocyclone has no moving parts. Moreover, hydrocyclones can handle a wide variety of flow rates. As a result, the hydrocyclone can handle a large variation in particle contamination in the collected wash water. In one design, the hydrocyclone has a ratio of the diameter of the inlets to the diameter of the hydrocyclone between 0.1 and 0.7, preferably between 0.2 and 0.6, more preferably between 0.3 and 0.5. This is advantageous for being able to cause a sufficient high-velocity difference between particles with different specific gravity so that the separation efficiency increases without causing excessive pressure drops. In one design, the hydrocyclone has a ratio of the diameter of the second outlet to the diameter of the hydrocyclone between 0.15 and 0.45, preferably between 0.20 and 0.40, more preferably between 0.25 and 0.35.This is advantageous because an improved separation of fine particles can be achieved without causing excessive pressure losses. In one design, the cleaning installation comprises a second sieve for removing the residual wash water from the particles. The second sieve is a vibrating sieve. The second sieve comprises an inlet for introducing the particles with the residual wash water onto a sieve surface of the second sieve. The second sieve comprises a first outlet and a second outlet respectively for removing the residual wash water separated from the particles and for removing the particles from the sieve surface. The second sieve reduces abrasion of the sand during washing, causing the washing installation to show less wear, which also means less maintenance is required5. Furthermore, removing the sand prevents wear on pumps or other parts within the facility. In addition, the sand will not be reintroduced into the washing installation, so that an increase in the concentration of the sand will not occur. 10In one design form, the vibrating screen can be vibrated in a linear, circular, or elliptical motion. Preferably, the vibrating screen can be vibrated in an elliptical motion. This allows the particles, together with the remaining wash water, to be processed in their sticky or wet form. 15 In one configuration, the cleaning installation comprises a third sieve for separating residual wash water from the plastic and / or metal waste. The residual wash water is carried away from the washing installation by the plastic and / or metal waste. The residual wash water flows through a sieve surface of the third sieve. The plastic and / or metal waste is transportable over the sieve surface of the third sieve. Preferably, the third sieve is a vibrating sieve. More preferably, the vibrating sieve comprises two compartments for the stepwise removal of the residual wash water. The maximum amount of wash water can be recovered through the third sieve. The residual wash water can be combined with the collected wash water. 25 In one configuration, the cleaning installation comprises a secondresting tank for the overflow of screened wash water from the first resting tank to the second resting tank. The cleaned wash water can be reused from the second resting tank for washing the contaminated plastic and / or metal waste. This means that in this configuration, the return line runs from the second resting tank back to the washing installation. Preferably, the cleaned wash water is stored in the second resting tank. By the overflow of the screened wash water into the second resting tank, a higher purity of the cleaned wash water can be obtained, because partial sedimentation of fine particles can still occur in the first resting tank. Moreover, the second resting tank can serve as a buffer to absorb fluctuations in the volume of the cleaned wash water. The fine particles do not belong to the particles separated by the second screen. In one configuration, the cleaning installation comprises a third settling tank for storing the collected and fiber-free wash water. The third settling tank is therefore located after the first sieve. The third settling tank can serve as a buffer for further cleaning steps.of the collected fiber-free wash water. From the third settling tank, the collected fiber-free wash water can be pumped to the hydrocyclone for separating the particles from the collected fiber-free wash water. In one design, the device is placed on a non-permeable surface. The device includes a gutter for collecting water on the non-permeable surface. Optionally, losses from the processing of the plastic and / or metal waste can be collected in the gutter, gathered in a buffer, and added to the third settling tank. This allows losses during the cleaning of the wash water to be avoided as much as possible in order to achieve the highest possible efficiency. In one design, the cleaning installation includes one or more settling tanks. At least one settling tank is a lamella separator. The cleaning installation comprises a water tank for storing water from the lamella separator. The lamella separator comprises an inlet for introducing the screened wash water into the settling tank. The lamella separator comprises lamellae for retaining and settling fine particles.particles to sludge from the screened wash water. Preferably, the fine particles are agglomerated. The lamella separator comprises respectively a first discharge and a second discharge for removing the sludge along the lamellae and for decanting water over the lamellae into the water tank. In one design form, the lamellae are positioned at an angle of at least 45° and at most 75° with respect to a horizontal plane. Preferably, the lamellae are positioned at an angle of at least 50° with respect to a horizontal plane, but preferably at least 55°, but preferably at least 57°. Preferably, the lamellae are positioned at an angle of at most 70° with respect to a horizontal plane, but preferably at most 65°, but preferably at most 63°. This allows the fine particles or the agglomerated fine particles to be retained in the inflow35 of the screened wash water and settle by sliding downwards. BE2024 / 5868 18 In a further design form, the cleaning installation comprises a buffer tank forthe storage and buffering of the sludge. The buffer tank contains a first feed for the introduction of the sludge. The buffer tank contains one or more rotatable mixing elements for keeping the sludge in suspension. The buffer tank contains a discharge for removing the sludge in suspension from the buffer tank. The buffer tank can serve as a buffer for further processing and separating the sludge from the screened wash water. Moreover, the buffer tank can keep the sludge in suspension so that no accumulation of sludge can occur on the bottom of the buffer tank, thereby reducing the need for maintenance. Furthermore, accumulation of sludge on the bottom can reduce the volume for storing sludge and decrease the buffer. In a single design, the buffer tank comprises at most ten rotatable mixing elements, preferably at most six, or preferably at most three. The multiple rotatable mixing elements can keep the sludge in homogeneous suspension over the full depth of the buffer tank. In a single design, the lamella separator comprises a scraper for removing foam from a free water surface of the lamella separator.Preferably, the cleaning installation comprises a means of transport for transferring the scraped foam to the buffer tank in a previously described configuration. The scraper can remove the foam from the water surface, so that contamination of the water by the foam in the water tank can be avoided. 25 In one configuration, the cleaning installation comprises a press for separating wash water from the sludge. The press is a belt filter press or a chamber filter press. The press comprises an inlet for introducing the sludge, whereby the press includes a filter for retaining filter cake from the sludge and for separating the wash water, whereby the press comprises a first discharge and a second discharge30 respectively for removing the filter cake from the filter in the press and for removing wash water from the sludge in the press to the first settling tank. This is advantageous for the highest possible efficiency in the reuse of wash water during the washing of the contaminated plastic and / or metal waste. 35 In an alternative configuration, the cleaning installation comprises adecantation centrifuge for separating wash water from the sludge. Flottweg is a non-exhaustive example of a manufacturer of suitable decantation centrifuges. A decantation centrifuge has similar advantages to a press. The decantation centrifuge comprises an inlet for introducing the sludge, a first discharge for removing the filter cake from the decantation centrifuge and a second discharge for removing wash water from the sludge from the decantation centrifuge to the first settling tank. In a configuration, the cleaning installation comprises one or more addition stations. A first possible addition station is for adding flocculant to the screened wash water. A second possible addition station is for adding anti-foaming agent to the collected wash water. A third possible addition station is for adding dewatering additive to the sludge suspension. This allows the fine particles to be agglomerated. Additionally, foam formation can be prevented in the cleaning installation. Thiscan the sludge be further agglomerated and dewatered so that the remaining wash water can be removed from the sludge more easily. Preferably, the presence of one or more addition stations in the facility is determined according to a ranking as listed above. In a configuration, the press comprises at least two belts and a series of rollers. The at least two belts are arranged in loops around the rollers. The at least two belts are positioned opposite each other in pairs and form a passage for the sludge. During operation, the sludge is moved through the passage and pressed between two opposing belts. Preferably, the press comprises no more than at most three pairs of belts placed one after the other. The belts and the series of rollers can continuously and efficiently press the wash water out of the sludge. In one design form, the series of rollers comprises at least three rollers. Preferably, the press comprises no more than at most ten rollers, which are positioned successively next to each other, separated only by the belts. More preferably, the series of rollers comprises at least five and at most eight rollers. The belts and the series of rollerscan continuously and efficiently press the wash water out of the sludge. In one design, the press includes a scraper to scrape the filter cake from the belts at the end of the rolling series. The scraper can remove the filter cake35 in a continuous manner from at least two belts. BE2024 / 5868 20 In one design, the press includes spray nozzles for rinsing the belts with water. Preferably, the water comes from the water tank as preparation to be able to press new sludge between the belts. The spray nozzles can remove the filter cake from at least two belts in a continuous manner, so that the at least two belts no longer contain any sludge. Preferably, there is at least one spray nozzle for rinsing each belt of the at least two belts. In a preferred configuration, the installation comprises at least the washing system, the drum filter screen, the hydrocyclone, the first settling tank, the 10-lamella separator, and the water tank. Preferably, the wash water can return from the washing system to the washing system by flowing through thedrum filter screen, the hydrocyclone, and the first rest tank in that order. Preferably, the water additionally flows through the lamella separator and the water tank after the first rest tank. Preferably, the installation comprises an additional second rest tank and a third rest tank. Even more preferably, the installation also comprises a second, a third screen, and a buffer tank. Even more preferably, the installation comprises multiple addition stations. In one design form, the washing installation is a washing drum. The washing drum comprises an injector for introducing the cleaned wash water and the soiled plastic and / or metal waste. The washing drum comprises a casing. The washing drum comprises a spiral for moving the wash water through the casing. The spiral comprises paddles for carrying the soiled plastic and / or metal waste and a portion of the wash water upwards. The paddles are cross connections between successive windings of the spiral. The washing drum comprises a first drain and a second drain for removing the wash water from the washing drum and respectively for removing the plastic and / ormetal waste from the washing drum. The casing is rotatable by means of rollers, whereby the rollers are driveable. The spiral is attached to an inner side of the casing30. The spiral preferably extends over the entire length of the casing. The injectors and the second drain are each located at an opposite end of the casing following a direction in which the casing extends. The casing contains openings for removing wash water from the casing to the first drain.35 BE2024 / 5868 21 In one design form, the casing is divided into at least four zones between the inlet and the second drain. A first zone is configured for soaking, carrying, and settling the soiled plastic and / or metal waste in the wash water. The casing is closed in the first zone, so that the wash water the cannot leave the washing drum. The soiled plastic and / or metal waste is washed in the first zone. The first zone is a washing zone. A second zone follows the first zone. The second zone contains openings in the casing. The second zoneis configured for rinsing off soiled plastic and / or metal waste and removing wash water from the plastic and / or metal waste through the openings. The second zone is a sieve zone. The second zone preferably comprises one or more spray nozzles within the casing for rinsing off the plastic and / or metal waste. The second zone is followed by a third zone. The casing is closed within the third zone so that the wash water cannot leave the washing drum. The plastic and / or metal waste is rinsed in the third zone. The spiral is preferably higher at the beginning and end of the third zone, so that the wash water cannot immediately escape from the third zone. This allows the plastic and / or metal waste to soak for a while during rinsing. The third zone is configured for rinsing, soaking, carrying away, and depositing the soiled plastic and / or metal waste in the wash water. The third zone is followed by a fourth zone. The fourth zone contains openings in the casing. The fourth zone is configured for removing wash water through the openings. AtPreferably, the fourth zone is configured for picking up and depositing plastic and / or metal waste. This is advantageous for removing as much wash water as possible from the plastic and / or metal waste. The fourth zone is free of spray nozzles within the casing, so that no additional wash water is added and the plastic and / or metal waste is obtained from the fourth zone as dry as possible. The fourth zone is a final sieve zone in the washing drum. It is clear that the washing drum can comprise multiple rinsing zones and sieve zones, which preferably alternate between the washing zone and the last sieve zone.30 Preferably, the casing includes paddles in the first zone, the third zone, and the fourth zone for carrying away the plastic and / or metal waste and part of the water, so that the soiled plastic and / or metal waste can be carried upwards by the paddles, to subsequently fall downwards. This allows 35 contamination of the plastic and / or metal waste to be removed or the wash water of the plastic and / or metal waste to be removed. BE2024 / 5868 22In a design mold, there is a difference between 50 mm and 700 mm between the outer and inner diameters of the spiral, preferably between 150 mm and 600 mm, or more preferably between 250 mm and 500 mm. Due to a sufficient difference between the outer and inner diameters of the spiral, enough of the contaminated plastic and / or metal waste and the wash water can be carried along to be transported through the casing. As a result, a mass of at least 1.5 tonnes per hour of contaminated plastic and / or metal waste can be washed. 10 In a design form, the outer diameter of the spiral is at most 5m, preferably at most 4.5m, preferably at most 4.0m, preferably at most 3.5m, preferably at most 3.0m, preferably at most 2.5m. The inner diameter of the spiral is at least 1.5m, preferably at least 1.6m, preferably at most 1.7m, preferably even more preferably at least 1.8m, preferably at most 1.9m, and preferably at most 2.0m. This provides sufficient height available to the contaminated plastic and / orto collect metal waste and a portion of the wash water without the washing drum assuming large dimensions. As a result, the curvature of the casing is sufficiently large to smoothly collect the soiled plastic and / or metal waste and allow it to fall. In a design form, the spiral has a pitch between 100mm and 700mm, preferably 150mm to 650mm, preferably 200mm to 600mm, preferably 250mm to 550mm, preferably 300mm to 500mm. A sufficiently large pitch of the spiral is necessary to transport the soiled plastic and / or metal waste sufficiently within the casing, so that pieces of plastic and / or metal waste fit between two consecutive windings of the spiral. Preferably, the spiral has a constant pitch. 30 In a design form, the paddles are positioned between two successive windings of the spiral. The paddles are preferably radially oriented and preferably extend from the inner diameter to the outer diameter. Preferably, the paddles are flat. The paddles are preferably more numerous in the firstzone and in the third zone and the fourth zone for more frequent collection of the plastic and / or metal waste. This is advantageous because the soiled plastic and / or metal waste at the beginning of the washing drum contains more contamination than at the end of the washing drum and therefore needs to be washed less intensively. In one design form, the casing has a length between 2 and 12 m. Preferably, the length is at least 3 m, preferably at least 4 m, and preferably at least 5 m. Preferably, the length is at most 11 m, preferably at most 10 m, and preferably at most 9 m. This provides sufficient length to wash the soiled plastic and / or metal waste. Moreover, the length is long enough to work within the four different zones, with sufficient length for each zone to perform its intended function. In one design form, the washing drum comprises one or more spray nozzles for rinsing off the plastic and / or metal waste in the washing drum. Preferably, some of the spray nozzles are placed within the casing in the second zone forthe rinsing off of the soiled plastic and / or metal waste. Preferably, at most three spray nozzles are placed in the casing. This is advantageous for removing adhering soiling from the plastic and / or metal waste. Furthermore, water can be added to the wash water to dilute the soiling. This simplifies further cleaning and transport of the wash water. In one design, the wash drum includes a filter in the openings in the casing for filtering wash water. This allows the plastic and / or metal waste to be easily separated from the wash water. Moreover, in combination with the rinsing step, water can be added to reduce the concentration of soiling in the wash water and to guarantee continuous removal of the wash water. This ensures effective cleaning of the plastic and / or metal waste. In one version, the filter is a wedge-shaped wire filter. Preferably, there is spacing between the different wedge-shaped wires.from 0.75mm to 1.25mm, preferably from 0.85mm to 1.20mm, preferably from 0.95mm to 1.15mm, preferably from 1.00mm to 1.10mm. The spacing is measured at the narrowest point between adjacent wires. Through the wedge-shaped wire filters, wash water with contamination can be efficiently removed from the washing drum35, taking the particles and fibers with them. In this way BE2024 / 5868 24 the contaminated plastic and / or metal waste can be sufficiently retained for the highest possible yield sorted plastic and / or metal waste. In one design, some of the spray nozzles are placed on the outside of the casing for high-pressure cleaning of the filters with water. Preferably, each zone with a filter contains spray nozzles on the outside of the casing. This keeps the filter pores clear for continuous filter operation. Preferably, the second drain is configured for draining both the wash water and the water for rinsing the filters. In this way, as much water as possible is reused as wash water.A professional trained in the technical field will appreciate that a method according to the first aspect is preferably carried out with the aid of a device according to the second aspect and that a device according to the second aspect is preferably configured for carrying out a method according to the first aspect. Consequently, each mark described in this document, both above and below, may relate to any of the three aspects of the present invention. In one third aspect, the invention concerns the use of a method according to the first aspect and / or a device according to the second aspect for the purification and reuse of water derived from a processing process of plastic and / or metal waste, where the waste is derived from car shredder residue, from discarded electronic and electrical equipment or from bottom ash of an incinerator. 25 The processing process is preferably a sorting process. This use results in a cost-effective separation of contamination in the wash water for waste streams originating from ASR, WEEE or bottom ash from an incinerator. EXAMPLES30The invention will now be further explained by means of the following examples, without however being limited thereto. The examples describe a device and a method for the contamination of wash water originating from a processing process of plastic and / or metal waste whereby water recovery within the processing process is possible. BE2024 / 5868 25 EXAMPLE 1 Example 1 concerns an implementation form of a method and a device for washing plastic and / or metal waste with water recovery. The method in example 1 is schematically shown in Figure 1.5 Figure 1 shows a flowchart of a method according to an implementation form of the present invention. 101) contaminated plastic and / or metal waste10 102) washed plastic and / or metal waste 103) collected wash water 104) contamination 105) sieved wash water 106) cleaned wash water15 201) washing the contaminated plastic and / or metal waste in the washing installation 202) collecting wash water in the collection tank 203) sieving the collected wash water in the first sieve204) storing screened wash water in a first settling tank 20 205) decanting cleaned wash water from the first settling tank The installation comprises a washing installation, a cleaning installation, a collection tank and a return line. The plastic and / or metal waste is introduced into the washing installation together with cleaned wash water. The plastic and / or metal waste is washed with wash water, whereby contamination of the plastic and / or metal waste is removed until washed plastic and / or metal waste is obtained. The wash water from the washing installation is collected in the collection tank. From the collection tank, the collected wash water is transported to the cleaning installation. The cleaning installation comprises a first screen. The first screen is a drum screen. The collected wash water is introduced into the first screen by means of a feed. The collected wash water passes through a screen surface of the first screen, whereby filtered wash water is obtained. The contamination, being the fibers and solid particles, is removed from the collected wash water to form fiber-free wash water.The fibers and solid particles are removed from the first sieve by means of spirals.35 The sieved wash water is subsequently stored in a first settling tank via an inlet. The sieved water is decanted from the first settling tank BE2024 / 5868 26 via an outlet. The cleaned wash water is reintroduced into the washing installation via the return line. Possible sand and fine particles settle in the first settling tank. The washing installation is a washing drum. The washing drum contains an injector for introducing the cleaned wash water and the plastic and / or metal waste. The washing drum contains a casing. The washing drum contains a spiral for moving the wash water and the plastic and / or metal waste through the casing. The spiral contains paddles for carrying the plastic and / or metal waste and a portion of the wash water upwards. The paddles are transverse connections between successive windings of the spiral. The washing drum contains a first discharge and a second discharge, respectively, for removing the wash water together with impurities and for removing the washed waste.plastic and / or metal waste from the washing drum. The casing is rotated by driven rollers. The spiral is attached to an inner side of the casing.15 The injectors and the second drain are located at opposite ends of the casing in a direction in which the casing extends. The casing contains openings for removing wash water together with dirt from the washing drum to the first drain. The casing is divided into four zones between the inlet and the second drain. A first zone is for washing, soaking, removing and depositing the plastic and / or metal waste in the wash water. A second zone is for rinsing off the plastic and / or metal waste and for removing the wash water through the openings which contain filters. A third zone is for rinsing the plastic and / or metal waste. A fourth zone is for draining the wash water from the plastic and / or metal waste. The 25 casing includes paddles in the first zone, the third zone, and the fourth zone for carrying away the plastic and / or metal waste and part of the water. Thewindings of the spiral comprise an inner side and an outer side. EXAMPLE 230 This example concerns another implementation form of a method and a device for washing plastic and / or metal waste with water recovery. Figure 2 shows a flowchart of a method according to another 35 implementation form of the present invention. BE2024 / 5868 27 101) contaminated plastic and / or metal waste 102) washed plastic and / or metal waste 103) collected wash water 106) cleaned wash water 107) fibers5 108) particles with residual wash water 109) particles 110) residual wash water 111) fiber-free and particle-free wash water 112) flocculant10 113) water free of sludge 114) sludge 201) washing the contaminated plastic and / or metal waste in the washing installation 202) collecting wash water in the collection tank15 205) decanting cleaned wash water from the first rest tank 206) sieving the collected wash water into fiber-free wash water 207) separating particles from residual wash water and particle-free wash water from the fiber-free wash water in a hydrocyclone208) sieving of particles with residual wash water on the second sieve20 209) storing the fiber-free and particle-free wash water in a first settling tank 210) settling of the sludge from the fiber-free and particle-free wash water with flocculant in lamella separators separating water into a water tank inlet211) 211) decanting water from the water tank25 The installation comprises a washing installation, a cleaning installation, a collection tank and a return line. The cleaning installation comprises a first sieve, a hydrocyclone, a second sieve, a first settling tank, a settling tank and a water tank. The plastic and / or metal waste is introduced into a washing installation together with 30 cleaned wash water. The plastic and / or metal waste is washed, whereby contamination of the plastic and / or metal waste is removed. The wash water from The washing system is collected in a collection tank. From the collection tank, the collected wash water is transported to the cleaning system. The first sieve is a drum sieve and comprises an inlet, a first outlet and a second outlet for 35respectively the introduction of the collected wash water, the removal of fiber-free wash water and the removal of fibers and solid particles from the first sieve. BE2024 / 5868 28 Subsequently, fiber-free wash water is pumped to the hydrocyclone. Particles with a density greater than water, such as sand, are separated from the wash water in the hydrocyclone. The fiber- and particle-free wash water leaves the hydrocyclone via the first discharge, and the particles leave the hydrocyclone via the second discharge. The particle-free wash water flows from the hydrocyclone to the first resting tank, where it is temporarily stored. Subsequently, the particles, along with the remaining wash water, are brought to the second sieve via an inlet from the second sieve. The second sieve is a vibrating sieve that separates the remaining wash water from the particles, and via a first discharge from the second sieve, the remaining wash water flows to the first resting tank. A portion of the fiber-free and particle-free wash water from the first resting tank is decanted along a first discharge from theThe first resting tank's washer water is reused as cleaned wash water along the return line. Another portion of the fiber-free and particle-free wash water from the first resting tank is transported to the settling tank via a second drain. The settling tank is a lamella separator. A flocculant is added to the other portion of the fiber-free and particle-free wash water to agglomerate fine particles. The flocculant is added to a mixing tank and mixed with the fiber-free and particle-free wash water using agitators. In the lamella separator, the fine particles settle along the lamellae to form sludge. The lamellae are positioned at an angle of 50° relative to a horizontal plane. The fiber-free and particle-free wash water decants over the lamellae until water free of sludge is obtained. The water is temporarily stored in the water tank before being reused in the washing system, where the water sprays off plastic and / or metal debris and dirt, and optionally cleans the filters of the washing system. The filters of the washing system are wedge-shaped wire filters with 25a spacing between the various wedge-shaped wires of 0.15 mm to 1.25 mm. The sludge is then removed from the lamella separator. EXAMPLE 3 30 Example 3 refers to a further execution form of Example 2. The cleaning installation comprises an additional third resting tank, a second resting tank, a buffer tank and a press. Figure 3 shows a flow diagram of a method according to a further 35 execution form of the present invention. BE2024 / 5868 29 101) contaminated plastic and / or metal waste 102) washed plastic and / or metal waste 103) collected wash water 106) cleaned wash water 107) fibers5 108) particles with residual wash water 109) particles 110) residual wash water 111) fiber-free and particle-free wash water 112) flocculant10 113) water 114) sludge 115) dewatering additive 116) filter cake 117) residual water in the sludge15 201) washing the contaminated plastic and / or metal waste in the washing installation 202) collecting wash water in the collection tank 205) decanting cleaned wash water from the first resting tank 206) sieving the collected wash water into fiber-free wash water20207) separating particles with residual wash water and particle-free wash water from the fiber-free wash water in a hydrocyclone 208) sieving particles with residual wash water on the second sieve 209) storing the fiber-free and particle-free wash water in a first settling tank 210) settling the sludge from the fiber-free and particle-free wash water with flocculant in a lamella separator separating water into a water tank 211) decanting water from the water tank 212) buffering the fiber-free wash water in the third settling tank 213) decanting the fiber-free and particle-free wash water from the second settling tank into a lamella separator 214) keeping the sludge in suspension in a buffer tank. 215) pressing the sludge until separating the remaining wash water and filter cake from the sludge 216) buffering the fiber-free and particle-free wash water in the second resting tank35 BE2024 / 5868 30 After the first sieve, the fiber-free wash water is temporarily stored in the third resting tank as a buffer for other components of the cleaning installation. FromFrom the third resting tank, the fiber-free wash water is pumped to the hydrocyclone. After the first resting tank, the fiber-free and particle-free wash water is decanted into a second resting tank, and from the second resting tank, the cleaned wash water is led along a first drain from the second resting tank and along the return line to the washing installation for the reintroduction of the cleaned wash water into the washing installation. Optionally, a gutter is included in the installation for collecting water on a non-permeable surface on which the installation stands. Optionally, losses from the sorting process of the plastic and / or metal waste can be collected in the gutter, gathered in a buffer, and added to the first resting tank. The sludge originating from the lamella separator flows via a second drain from the lamella separator to an inlet of the buffer tank. In the buffer tank, the sludge is kept in suspension by rotating mixing elements, at preference two rotating mixing elements. Subsequently, a dewatering additive is added to the sludge suspension and pumped to the press. The press is abelt filter press, but can also be a chamber filter press or decanter centrifuge. In the press, the remaining water is separated from the sludge in suspension, which flows back into the first resting tank. 20 EXAMPLE 4 Example 4 relates to a washing drum as the washing installation of the facility, as shown in Figure 4A and Figure 4B. 25 Figure 4A shows a perspective view of a washing drum according to a design of the current invention. Figure 4B shows a detailed representation of a spiral enclosed in the washing drum consisting