Advantages and Comparison
The typical industrial sludge cake from filter press, belt press, decanter or a centrifuge may have a dry solid percentage of 25% – 40% (or 75% – 60% moisture content). Hence, a large percentage of the weight of the cake is actually from its water content – which leads to a costly disposal fee especially if the waste is hazardous to the environment.
Lantec Sludge Dryer uses recycled, warm, dry air to gently dry the cake up to 90% dried solids (10% moisture content). The saturated air which comes off the top of the sludge container is passed over refrigerated coils, where the moisture is removed, and then reheated prior to injection into the container. Lantec Sludger Dryer is capable to produce up to 70-80% reduction in weight of the sludge cake and this will significantly reduce hauling and disposal cost.
| Sludge Dryer | Rotary Dryer | Thermal Oil Dryer | Paddle Dryer | |
| Dryer Type | Dry Air | Heat Convection | Heat Conduction | Heat Conduction |
| Drying method to remove water | Direct dehumidification | Direct heating evaporation | Indirect heating evaporation | Indirect heating evaporation |
| Heating Element Type | Refrigerant Heat Pump | LPG Burner | LPG Burner or Element Heater with Thermal oil | Steam or Thermal Oil |
| Drying Temperature | Max 30℃ | 100 to 1,000℃ | 200 to 300℃ | 150 to 250℃ |
| Energy Consumption (per kg of water removed) |
Approximately 0.33kWh/kg | 0.17m3/kg | 1.5kWh/kg or 0.16m3/kg | 1.3kWh/kg or 0.14m3/kg |
| Fire Hazard |  |
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| Air Emission Permit and Control | Close loop air recirculation |
Chimney/Scrubber |
Chimney/Scrubber/Deodoriser |
Chimney/Scrubber/Deodoriser |
| Dust issue | |
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| Rust on mechanical structure | |
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| Burning sludge foul smell | |
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Advantages of Sludge Dryer
