抄録
Although informal recycling has been researched in many places and from many viewpoints, few studies examined how the recyclables reach a recycling factory, and how much recyclables become secondary materials, based on quantitative and qualitative research. For this study, Fieldwork was conducted 24 times within a total of 808 days between February 2010 to January 2018 with qualitative and quantitative interviews. The objectives of this work are to present (1) the estimated average weight of recyclables on an individual basis, (2) the estimated average weight of recyclables on a household basis, (3) the informal recycling rate, and (4) the estimated reduction effect of CO2 emission and energy consumption. The average amounts of recyclables were 84.5 kg for HW=0 and 66.3 kg for HW=1. The average amount of recyclables was 126.7 kg. The informal recycling rate was 2.2. It was estimated that 2.2% of all wastes and 12.3% of non-organic wastes were collected by waste pickers, that 1,384.5 tons/month of recycled materials were produced by the activity of on-site informal recyclers, and that every month at least 1,147.8 tons of CO2 and 76,015 GJ of energy consumption were reduced by the activity of on-site informal recyclers.
