Dry-wet is a separate collection system that allows to sort waste in the most efficient way and easy to follow for citizens in order to increase recycling rate
The organic fraction is, in some city areas, 50% of the total waste deposited in containers.
From 1994 onwards household waste is collected selectively, being separated at origin into four frctions: paper and cardboard and glass, collected weekly; and "wet" and "dry" fractions, collected daily.
Dry fraction contains all recyclbe materials and inerts, whih can be recovered by material in an appropriate treatment plant. Wet fraction contains organic waste which is turned into compost used for agricultural purposes
Development and Timescale:
The pilot test took place in a highly populated district and it was extended to whole city in 10 years
• This type of collection costs 30% more than the average ordinary cost, and is calculated at €78/tonne (instead of €60/tonne).
• Furthermore, awareness raising campaigns are necessary to make the new model popular (around €30,000/year)
Use level: (%) or number of users
100% - 328,000 inhabitants of the city of Cordoba are users of the separation model.
Possible success factors:
Only 2 waste bins/containers needed in homes and on streets for collection of the main fractions.
High potential for recycling.
Work with different associations and civil groups, communication campaigns, wide distribution of 2-section recipients.
Resources required are the same as for the implementation of selective collection, mandatory in Spain since 1997. It is necessary to treat waste collection in a proper MBT plant to optimisize sorting recyclable materials.
Evidence of success
Increase of packaging recovered with regard to the average for Andalucia of 230 % from 2010 to 2014, from 7,2 to 23,8 kg/inhabitant/year.
Organic waste selective collection and its aerobic fermentation allows to produce good quality compost for agricultural purposes. Experiments to test effectiveness of compost applied on agricultural soils show an increase on productivity
The main difficulty was changing people's deep-rooted habits.
It is necessary to persevere, with ongoing campaigns to raise awareness about the importance of changing habits.
Potential for learning or transfer
It is a simple system to transfer because it is easy-to –follow for citizens and there is no important investment required in containers in comparison with other selective waste collection system. However, it is essential to design MBT (mechanical-biological treatment) plant properly and keep ongoing campaing awareness.
Having only 4 fractions reduces collection costs and number of containers at streets. In addition to this, extra incomes for high material recovery rate allow to reduce waste taxes for citizens about 50%
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