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Composting is an intensive biological process of decomposition and stabilization under aerobic conditions. It applies to both organic matter from pretreatment of residual waste and organic matter from selective collection after methanization. Composting allows for making use of these two materials to obtain different quality compost.
Ecoparc de Barcelona has 38 composting tunnels arranged in four parallel blocks. Three are used for organic matter extracted from residual waste. The fourth is for sludge resulting from methanization.

First block tunnels speed up the natural fermentation of organic matter. To this end, the tunnels are equipped with sensors that measure air and organic matter temperature, oxygen, volume of ventilation flow, and pressure. Based on these measurements, the water needed for accelerating the process is supplied.

In phase two of the composting process (maturing), fermented organic matter passes through the tunnels of the second block. This phase requires adequate aeration, which is attained thanks to rigorous control of conditions.
The third phase of the process involves stabilization and cleaning of the material.

When the process is complete, the compost is subjected to mechanical processes that eliminate impurities, homogenize the final product, and make it suitable for use in agriculture and gardening.



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