Model BioCo - Sludge Dryer
Drying sludge has several advantages, including: Sanitization: sludge is dried at over 80°C during more than one hour, removing pathogenic germs (USEPA Class A); Stabilization: biological activity in sludge is stopped by drying; Tonnage reduction: water in sludge is almost completely removed which reduces sludge tonnage to 1/5 - 1/3; Better sludge utilization: it can be used without causing problems, storage is easier, and spreading is feasible with conventional fertilizer spreading resources. Sludge is a high quality fuel which is suited to various combustion methods.
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Overview
Features & Benefits
In addition to optimal drying, the BioCo™ technology brings other benefits.
- Operational security and safety:
>The drying air and sludge circulate in co-current, which limits fire risks. The drying air gets into the dryer at a maximum temperature of approximately 170°C, while the sludge enters at a temperature of approximately 20°C.
>The BioCo™ dryer works without dried sludge recycling, preventing the formation of dust. This eliminates the fire risk related to its inflammation.
> This highly automated system has sensors, detectors, alarms, stopping procedures and a sprinkler system. It is also characterized by its low belt speed. - BioCo™ works at relatively low temperature; between 170-120°C during the first drying step and between 100-80°C for the second. Several heating systems can be used to achieve these temperatures.
- The drying plant is maintained in slight negative pressure by a centrifugal fan ensuring continuous extraction of a part of the drying air. In a conventional configuration, the noncondensables and the excess air return to complement the boiler combustion air. The tightness of the sludge distribution system seals prevents any odor emissions.
- The BioCo™ dryer is a tried and tested industrial tool with 22 references around the world.
- The range is available in 10 models, covering evaporation capacities from 500 to 3,000 kg/h
In some cases, it is possible to couple BioCo™ technology with other Veolia processes for more efficiency.
- Rosny, France, 2013, drying before incineration (Pyrofluid™), 142 000 PE
- Evry, France, 2013, drying with biogas air heater, 250 000 PE
- Marquette lez Lille, France, 2015, 620 000 PE
- Alderwood, USA, 2013, 100 000 PE
- Pomorzany, Poland, 2011, 420 000 PE
- Draguignan, France, 2006,70 000 PE
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