Sewage sludge management has become a major challenge due to stricter agricultural disposal restrictions, increasing treatment costs. While dewatering technologies, such as screw presses and advanced centrifuges, are well established, drying systems are still evolving. Consequently, we position ourselves as a reliable technical partner for designing and implementing even the most complex sludge treatment solutions.
BELT DRYING
Low-temperature belt drying uses convection heat rather than radiation, allowing longer retention times at reduced speed and temperature compared to rotary drums. Moreover, it efficiently utilizes residual plant heat (typically around 80°C) and features a simpler authorisation process since no combustion chamber is required. In addition, the material is evenly distributed on air-permeable conveyor belts, and the modular construction allows flexible plant design and easy scaling.
ROTARY DRUM DRYING
Rotary drying is one of the most widely used methods in chemical engineering for drying wet materials. The process takes place in a rotating cylindrical dryer, which can be slightly inclined, where wet material is fed at the upper end and moves through the drum due to rotation, flow disruption, and gravity, delivering the dried product at the outlet. Moreover, the gas flow direction—co-current or countercurrent—is selected based on the material properties: co-current is ideal for heat-sensitive materials, while countercurrent maximises thermal efficiency for other materials. Heat transfer occurs mainly through direct contact between gas and solids, and the dryer is equipped with insulated metal linings and, if needed, a combustion chamber for high-temperature operation. In addition, gas flow is carefully controlled using aspirators or blower systems, and the material feed is uniform, typically via a screw conveyor. Overall, rotary dryers offer simple construction, high efficiency, low maintenance, and long-term durability, making them a reliable solution for industrial drying applications.
MUD.
Contacts
Registered office: Via Enrico Fermi 32 – 24020 Scanzorosciate (BG)
Operational headquarters, warehouse and workshop: Via A. Moro 1 – 24020 Scanzorosciate (BG)
Cap. Soc. € 600.000,00 i.v.
R.I. BG, Cod. Fisc. e P.I. 02887960165
Cod. Univoco SUBM70N
REA 331280
info@fidiaeng.it
(+39) 035 659 4550
