BPT Perculator for processing solid waste

Archiv – Italian manufacturer Brevini Power Transmission is a designer of gearboxes specifically for the recycling sector. Now the company has developed a process for treating solid waste known as the BTP Percolator. New Product | Italian manufacturer Brevini Power Transmission is a designer of gearboxes specifically for the recycling sector. Now the company has developed a process for treating solid waste known as the BTP Percolator. The system comprises the following process stages: mechanical treatment; biological treatment with percolation; process water treatment; gas recovery; and post-treatment.
In the mechanical treatment part of the BTP Percolator process, municipal and similar industrial waste is unloaded in the receiving area of the percolation plant ready for classification using a scalping trammel. Biodegradable organic waste is sent for biological treatment (percolation), while dry material with a high calorific value is recovered for use as refuse-derived fuel either directly or after conditioning/compaction. Ferrous materials are removed from both fractions by a magnetic separator.
In the biological treatment stage of the process, the percolator – which incorporates the S Series Brevini gearbox – functions as a continuously operating, horizontal cylindrical reactor with a hydraulic mixing system and a hydraulic scraper. Organic waste remains in the percolator for two days and is subsequently washed using process water to eliminate soluble matter.
Solid substances extracted from the percolator are saturated with water. Before fermentation, inert minerals such as sand, gravel and glass – and also fibres – are removed via sedimentation and filtering. The water used throughout process is filtered while the collected biogas – amounting to some 40-50 m3 per tonne of waste – is usually sufficient to run the entire system. It is also used for heating the plant and drying treated waste.