One of the important tools of environmental management is the assessment of life cycle products from cradle to grave. The purpose of this study is to eva‎luate the life cycle assessment of the Tehran’s waste management. In this regard, two scenarios were studied, which are: the role of unofficial waste collectors in overall cycle of waste management, and the other is the necessity eva‎luation of life cycle effects of waste management scenarios with regards the effects of unofficial collectors. Therefore investigation are focused on 22 districts of Tehran city. The quantity and quality of collected informations of waste in Tehran were from waste management department (managers and staffes), private contractors and Eco-invent v307 database. The underinvestigation scenarios were developed in four different situations (on the based of recycling in official sectors) for increasing the percentage of improvement recycling. In the first situation, each of the official and unofficial sector collected some part of Tehran waste. In the second situation, unofficial sector omitted and recycling capacity of official sector remained constant. In the third situation, unofficial sector omitted and recycling capacity considered in Aradkoh complex. In the fourth situation, unofficial sector omitted recycling capacity was handed over to private contractors. In this study, the method used for global warming effect was, Impact 2002+ and similarly version 10 of Open LCA software and Eco-invent secondary database. The results showed that in the category of intermediate effects, the toxicity effect of ground environment accounted for the largest share of 96.8%, followed by renewable energies with 3.1%. The share of other intermediate categories was less than 1 percent. eva‎luating results of final effects category are accounted less than 0.001% for human health effect, 96.8% for ecosystem quality, about 0.01% for climate changes and 3.11% for natural resources. In overal category effects, more than 90% environmental effects potential were related to official sector. In the organic respiratory effects, ozone layer depletion, renewable energies and mineral extraction, the share of unofficial sector was more than 5%. In the ground toxicity effect category, municipality was responsible for 95.5% of environmental effects. Regarding to constituted processes for each situations, the obtained results for quantitative eva‎luation scenarios in intermediate effects category, increasing the capacity of private sector (contractors) and optimizing the collection system, are associated with decreasing of potential environmental effects. In the assessment of life cycle performance of waste, although the phenomenon of gathering garbage from view point of social and economic aspects are a big problem, but in practice change to an arm help for official sector. Since the performanc of official sector is weak, the garbage mafia could return the recyclable waste to production cycle upto some extent and to prevent the environmental effects of unprinciple burial.

نوراله ميرغفاري

حسين وحيدي

حسين مرادي , علي لطفي