Recycling packaging waste plastics

T. Ernst R. Popp and R. van Eldik, Quantification of heavy metals for the recycling of waste plastics from electrotechnical applications, Talanta, 53, 347-357 (2000). W. Camacho and S. Karlsson, Quality-determination of recycled plastic packaging waste by identification of contaminants by CC-MS after microwave assisted extraction (MAE), Polymer Degradation and Stability, 71, 123-134 (2000). 

As for enviromnental aspects, in the last years many LCAs have been performed that aimed to compare the different recycling and treatment routes for plastics packaging waste. They often include cost calculations for the whole waste management chain. Examples include ... 

The eurrent and future levels of plastic packaging recycling is discussed with reference to the imminent updating of the 1994 Paekaging and Packaging Waste Directive. Data are ineluded relating to current recovery levels by eountry for western Europe, for mechanical and... 

The results of studies are discussed into the co-combustion of plastics with respect to the recycling of scrap plastics from the building, packaging, automotive, electrical and electronic industries. Tests were carried out by APME on plastic waste from these end-use industries in a typical large scale EfW facility with respect to operational and environmental problems. 

This provides brief information from a new report, produced on behalf of the British Plastics Federation, by the Centre for Economics Business Research, which says that over half of the UK s EPS packaging will be reclaimed by the year 2010, using recycling or waste-to-energy schemes. 

BASF has delayed a decision on whether to press ahead with a DM300 million investment in a plastics feedstock recycling unit at Ludwigshafen. The decision to go ahead depends on the winning of a contract from DKR, a new recycling company for plastics packaging waste. The article supplies full details. 

Contaminants in recycled plastic packaging waste (HDPE, PP) were identified by MAE followed by GC-MS analysis [290]. Fragrance and flavour constituents from first usage were detected. Recycled material also contained aliphatic hydrocarbons, branched alkanes and alkenes, which are also found in virgin resins at similar concentration levels. Moreover, aromatic hydrocarbons, probably derived from additives, were found. Postconsumer PET was also analysed by Soxhlet extraction and GC-MS most of the extracted compounds (30) were thermally degraded products of additives and polymers, whereas only a few derived from the original contents... 

The EU Directive on Packaging and Packaging Waste sets a recovery target for used packaging of 25% by 2001 and 50-65% by 2005. It is likely that recycling of postconsumer plastics will require substantial polymer/additive analyses. 

One approach to reduce the contaminant levels consists in reusing the wasted plastic as the core of the new material. Residues of pesticides or harmful contaminants may limit recycling of plastics as a result of their potential toxicity. Utilisation of post-consumer plastics for pharmaceutical or food-contact applications is forbidden, and multilayer food packaging materials manufactured using functional barriers are subjected to strict regulations [9, 40, 41]. 

Modern science and industry have provided a growing supply of material products. When they reach the end of their useful life, they become solid waste, and disposing of it has become a growing problem. Worst of all is over-packaging to stimulate sales, so discarded packaging is the major contributor to this solid waste. Plastics are not the major component of solid waste but because of their low density, bright colors, and relative weather-resistance, they are the most obvious component. It would be desirable to remove them from solid waste by recycling. 

Today important flows of plastics originate in mandatory recycling schemes, such as those imposed by take-back obligations on packaging, End-of life vehicles, or waste electric and electronic equipment (WEEE). For such materials, the drive for collection and recycling is not normally economic, but mandatory. In snch cases, there is often a dump fee, to be paid for farther processing a stream of waste plastics into recycled products. The value of such fees varies from some 50 /tonne for injection into blast fnmaces in the European Community to as much as 50-100 kYen ( 370-750 /tonne)... 

---