 Applications
Keppel Seghers HARDpelletiser sludge drying technology has been proven to handle successfully biosolids, municipal sludge and industrial sludge of varying types and origins (primary and secondary, raw and digested, physico-chemical, etc.).
Advantages
- Indirect dryer
- One step sludge drying and sludge pelletising
- Dust-free pellets
- Best thermal efficiency
- Highly reliable and maintenance free
- Minimal electric power consumption
- Safe operation
Description
In the 80's Seghers proactively developed its unique HARDpelletising process with evaporation. A vertical, multi-stage, indirect convective unit produces hard, round and dust-free pellets with more than 90% dry solids content in a single and safe operation.
Similar to the pearl formation process in an oyster, biosolids particles grow layer by layer and become hard pellets. This gentle process with efficient heat exchange and gravitation-aided biosolids movements results in low electricity consumption and reduction in operation and maintenance costs. The Keppel Seghers HARDpelletiser is available for all kinds of sludge and other biosolids with variable composition and for an evaporation capacity ranging from 50 to 15,000 kg H2O/h.
Integration of water evaporation and biosolids granulation into a single piece of equipment reduces investment costs for treatment of sludge. The vertical and compact design minimises the footprint, which is very important for high density areas.
The HARDpelletising process, with water evaporation, is strictly indirect and no oxygen is allowed into the system. Dust production is prevented through a straightforward and gentle process, and the operating temperatures are kept low. Fire and explosion risks are therefore totally eliminated.
Pellets produced by the HARDpelletiser are naturally round, hard, dust-free and with a narrow size distribution. The process ensures the stability and pasteurisation of the pellets. HARDpellets are of high hygienic quality and are easily handled, transported and stored for long periods of time. Hence, the HARDpellets can be used for many applications, ranging from soil improver and fertiliser to green fuel, depending on the sludge characteristics and the local environmental legislation.
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