Shredder waste

Description of the process. The simplified process flow diagram is shown in Figure 16.12. The shredder waste (ASR, plastic and electronic waste as well as MSW) is fed in an IRFB, which operates in a reducing atmosphere and at temperatures as low as 500-600°C, allowing easy control of the process. The IRFB reactor separates the combustible portion and the dust from the inert and metallic particles of the fed waste the obtained mixture of metallic and inert particles is sent to a mechanical metal separation while fuel gas and carbonaceous particles are burnt in a cyclonic combustion chamber for energy production and fine ash vitrification. Metals such as aluminium, copper and iron can be recycled as valuable products from the bottom off-stream of the IRFB as they are neither oxidized nor sintered with... 

CH. Pasel and W. Wanzl, Experimental investigation on reactor scale-up and optimisation of product quality in pyrolysis of shredder waste. Fuel Processing Technology, 80, 47-67 (2003). 

C. Pasel and W. Wanzl, Pyrolysis of shredder waste - reaction behaviour and product formation compared to thermochemical behaviour of solid fuels, Erdol Erdgas Kohle, 9, 449-454 (1998). 

Pyrolysis can be used for the thermal decomposition of waste materials that are predominantly organic in nature, e.g. scrap tyres, scrap cables, waste plastics, shredder wastes, and acid sludge. Rotary kilns are particularly suitable as universally applicable pyrolysis units for continuous operation. Highly aromatic pyrolysis oils for use as chemical raw materials are obtained at reactor temperatures of about 700 °G. Such pyrolysis oils could form the basis for the production of aromatics such as benzene, naphthalene, and their homologues, thermoplastic hydrocarbon resins and precursors of industrial carbon, when the proven processes for the refining of coal tar and crude benzene are applied. 

COMPONENTS l%] Scrap tyres Waste plastics Shredder wastes Scrap cables Aci d tar... 

Equipment used to reduce the size of solid waste including hammer mills, shredders, roll crushers, grinders, chippers, jaw crushers, rasp mills, and hydropulpers briquettes... 

Franklin Miller Inc. Crushers, mills, shredders and mixing equipment for chemical processing, waste reduction and wastewater treatment. http //WWW. franklinmiller. com... 

From the description above it already can be deduced that this plant can deal with a lot of waste types and hence is rather robust in terms of acceptance criteria. S VZ has experience with treating mixed plastics waste, waste derived fuel (a mixture of plastics, wood and paper), the shredder light fraction of car wrecks, and the plastic fraction from shredded white goods and electronics. SVZ can handle on average 2% chlorine in MPW, with short-term excursions to 6%. The overall chlorine content has to be controlled by a right blend with other waste types. SVZ does not favour a high... 

MIXED COMBUSTION OF AUTOMOTIVE SHREDDER RESIDUES WITH MUNICIPAL SOLID WASTE A SOUND ROUTE TO ENERGY RECOVERY FROM END OF LIFE VEHICLES... 

Stripping of electrical and electronic waste appliances must be carried out properly. During the processing of waste appliances (e.g., in shredders), it is essential to avoid that components highly contaminated with hazardous substances end up in fractions that are intended for recycling. It is furthermore necessary to ensure that the disposal of treatment residues (e.g., shredder residues) is not impeded by the presence of hazardous substances. As a rule, components containing particularly hazardous substances are to be removed manually. Future disposal processes, such as pyrolysis, may allow recycling of appliances without prior removal of hazardous substances, in which case it will be possible to do without the disassembly of hazardous components.411... 

The objectives for management and disposal of large electrical waste appliances are (a) stripping of hazardous substances (b) reduction of pollutant and metal content in the shredder residue (c) recycling and recovery of ferrous metals and (d) attainment of commercially recyclable scrap quality (e.g., low copper content in the scrap iron). 

The process is used on petroleum sludges, used tires, biomedical waste, automobile shredder residues, bark residues and municipal solid wastes. It is limited to treating organic wastes and contaminated soil. For soil contaminated by polychlorinated biphenyls (PCBs), vacuum pyrolysis cannot destroy the PCBs but will concentrate them in the pyrolytic oils. The process cannot be used to treat mine tailings. 

When asphalt-rubber (wet process) is applied to pavements, the tires come from the neighborhood of the nearest shredding/grinding facility. Because A-R is a patented material, there are only a limited number of shredding companies that supply rubber for this process. Some state government officials have indicated concern about whether waste tires from their own state can be used, as opposed to those tires near the present shredders, which might be located in another state. 

Waste from the automotive industry, particularly from end-of-life-vehicles (ELV), has been identified by the E.U. as another priority waste stream. After dismantling larger parts suitable for mechanical recycling, the vehicle is shredded, the metal fraction (about 75%) is removed, and the remaining residue is known as automotive shredder residue (ASR),... 

Rotary kilns are commonly used for different waste streams such as contaminated soils, petroleum residues, car shredder refuse, municipal solid waste (MSW) mixed with sludge and industrial waste, used tyres, etc. 

Table 16.1 reports a summary of pyrolysis processes for plastic wastes, auto shredder residues, tires and other wastes carried out with different gas-solid reactors. It can be deduced that now fluidized-bed technology appears mature and particularly attractive for... 

KWU Municipal waste Shredder light fractions 9 sites in Japan... 

The concentrations of TriCDTs, TeCDTs, and PeCDTs in soil and sediment samples, gas samples from waste incineration and aluminum smelting, ash from an aluminum smelting plant, a car shredder, and from combustion of wood chips, peat and refuse derived fuel, different effluents from a pulp and paper mill, and crab, carp, and lobster tissue samples, are presented in Table 1. 

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