Organic sludge has a specific behaviour that has a considerable effect on thermal drying processes. This behaviour primarily depends on the dry solids content obtained (figure 4). The dry solids ... Sludge treatment ... Sludge treatment Sludge drying ... sludge behaviour as it dries ... Sludge dewatering...

We strongly recommend consideration be given to running a drying unit in continuous mode, at least over a 5- day period. In the case of drying units with a high evaporation capacity (above 3 t · h–1 ... Sludge treatment ... Sludge treatment Sludge drying ... running sludge drying unit ... Sludge dewatering...

contact between the heat exchange fluid and the sludge (conduction) ; mixed dryer : a combination of the two preceding systems, the first part of the drying process takes place in an indirect drying zone ... Sludge treatment ... Sludge treatment Sludge drying Sludge dewatering Evaporis Heliantis ... drying technologies ... Sludge dewatering...

The HeliantisTMuses sun radiance to heat the surface of the sludge bed and aeration to evaporate the water contained in the sludge. The evaporated water then evacuated through natural convection ... Sludge treatment ... Heliantis Sludge treatment Sludge drying ... The sun, a free and sustainable energy source Smaller volumes. Savings in transporting and evacuating the sludge Long-term storage of the dried sludge Recovery/evacuation: a sustainable ... The most sustainable sludge drying process. ... natural sludge drying in green house – Heliantis™ ... Sludge dewatering...

Drying processes can be incorporated into cogeneration units by using the thermal energy generated by gas engines or gas turbines. The purpose of the following paragraphs (together with figure 21 ... Sludge treatment ... Sludge treatment Sludge drying Biogas ... sludge drying and cogeneration ... Sludge dewatering...

a wide range of sludge dryness and very different quality. Working on the principle of energy recovery the system is composed of several stages, including two drying stages consisting of a thin layer dryer ... Sludge treatment ... Evaporis Sludge treatment Sludge drying ... Minimizes storage and transport cost thanks to a high density dried sludge Eliminates the pelletization stage and its associated risks Dried sludge cooling built into the dryer Limits ... the lowest energy sludge drying system – Evaporis™ LE ... Sludge dewatering...

The EvaporisTM LT,low temperature sludge drying system, works on the principle of continued drying by hot air convection (65/80°) in a closed tunnel. The workshop accepts urban wastewater dewatered ... Sludge treatment ... Evaporis Sludge treatment Sludge drying ... low temperature sludge drying system – Evaporis™ LT ... Sludge dewatering...

dry solids content is required (often in the region of 65%). Indeed, at this dry solids content, dried sludge has a net calorific value equivalent to that of household waste. Some projects are emerging ... Sludge treatment ... Sludge treatment Sludge drying Dewatered sludge Evaporis Heliantis ... sludge drying to an intermediate dry solids content ... Sludge dewatering...

. The drying unit comprises the following main items of peripheral equipment : wet sludge and then dry sludge handling facilities; heat exchange fluid loop; vapour treatment with or without heat ... Sludge treatment ... Sludge treatment Sludge drying Dewatered sludge Evaporis ... drying unit design ... Sludge dewatering...

Sludge drying units must be subject to appropriate safety measures because they are the source of a number of risks, more specifically in the event of certain malfunctions. Without being exhaustive ... Sludge treatment ... Sludge treatment Sludge drying Aerobic ... safety and drying units ... Sludge dewatering...

, the following constitutes an example of a Naratherm dryer heat balance (table 6) : Table 6. NARA heat balance per kg · h–1 of water evaporated (based on a 20 % dry solids content sludge, 90 % dry ... Sludge treatment ... Sludge treatment Sludge drying Evaporis ... drying unit energy consumption ... Sludge dewatering...

to be achieved in the material leaving the dryer : The dry content must be high enough for the dried sludge to be stabilised and sanitized, but low enough to avoid creating dust particles and over ... Sludge treatment ... Sludge treatment Sludge drying Sludge dewatering ... Sludge dewatering...

. Figure 6. Schematic diagram of an Evaporis™ LE dryer Evaporis™ LE has the following advantageous characteristics : The density of dried sludge is high thanks to the formation of sludge ... Sludge treatment ... Sludge treatment Sludge drying Evaporis Termylis ... Sludge dewatering...

that is normally dried to better than 90%. Figure 34. Fixed carbon Pyrolysis can be applied to dewatered sludge provided it has virtually reached the self-sufficient heat level defined earlier. Pyrolysis ... Sludge treatment ... Sludge treatment Sludge drying Dewatered sludge Gasification Oxidation ... pyrolysis and thermolysis applied to sludge ... Sludge dewatering...

nitrogen treatment with one process and a single low loading stage. This system would produce highly hydrophilic sludge, resulting in low dry solids content dewatering (in the 18 to 22% range) whereas a line ... Waste water Sludge treatment ... Cyclor Wastewater Sludge treatment Biofiltration Sludge drying Biological phosphate removal ... end use of sludge: global optimisation of water and sludge...

is centrifuged. drying : To finish off the treatment, sludge is dried through the stage EVAPORISTM. Innovative, it operates on two levels. On the first level, sludge is spread into think layers and comes ... Waste water Sludge treatment ... Centrifugation Wastewater Sludge treatment Sludge digestion Activated sludge Anaerobic Sludge dewatering Sludge drying Biogas Methane fermentation ... Sludge dewatering Deodorization/Venting/Evaporation Methanisation...

removal Storage of the digested sludge: 3 tanks with a total capacity of 15,200 m3 Dewatering using 5 Guinard centrifuges Drying ... Waste water Sludge treatment ... Wastewater Biogas Sludge dewatering Anaerobic Sludge drying Disinfection Flotation ... Sludge dewatering Deodorization/Venting/Evaporation Flocculation/Sedimentation/Flotation Oxidation/Disinfection Pretreatment Biological processes...

Wastewater Grit removal Primary settling Disinfection Chlorination Sludge thickening Sludge digestion Cannon Mixer Sludge dewatering Sludge drying Biogas ... Sludge dewatering Flocculation/Sedimentation/Flotation Methanisation Oxidation/Disinfection Pretreatment Biological processes...

to water resource conservation. sludge as fuel SUEZ has taken the principles of sustainable development even further, introducing a sludge drying stage to reduce sludge volume and improve traceability ... Waste water Sludge treatment ... Reuse Aquazur Densadeg GDD/GDE Wastewater Sludge treatment Disinfection Sludge drying ... Sludge dewatering Deodorization/Venting/Evaporation Filters Flocculation/Sedimentation/Flotation Oxidation/Disinfection Pretreatment Biological processes...