Thermally assisted mechanical dewatering process
- How does it work?
- What can it be used for?
- What can it not be used for?
- Related Facilities
- Further Information
|Key words||Thermally assisted, dewatering, low pressure, pre-treatment, biomass, pressing|
|Completed by||INRA - IATE|
How does it work?
|Primary objective||dewatering process with improved efficiency (higher yield rate, lower energy consumption)|
|Working principle|| This process is an alternative solution to conventional pressing processes, and as such, is designed to be a pre-treatment prior to a thermal dryer.
Basically it is an improved filtration (2). This relatively soft method is characterized by a first key stage at low pressure and with a heating temperature (3) lower than the evaporation temperature of the liquid to be eliminated (4). The product to be dehydrated is introduced into a device of filtration and/or compression and is adequately heated (2,4).
In the case of Alfalfa (Medicago sativa), this process allows to reach an intermediary dry solid content of 62.5%, instead of 32.5% with the conventional pressing processes. (1)
|Additional effects|| Mass gain of green juice - charged in nitrogen, pigments and other molecules that may be valued - is more than 75 % and the quantity of water to be evaporated is approximately divided by 4 (these results are for dewatering + thermal dryer).
The coupling between this process of dewatering and thermal drying allows energy savings of at least 30 % compared to conventional pressing + thermal drying processes. (1)
|Important process parameters|| - pressure: lower than 700 kPa
- temperature: lower than the evaporation temperature of the liquid to be eliminated
|Important product parameters||moist products|
What can it be used for?
|Products|| Wet biomass, including Alfalfa, which is used as feed, and also liquid or pasty waste such as paper sludge or worn sodium bentonite.
To be tested on other wet materials.
|Solutions for short comings|| Improved mass gain of green juice
alternative solution to conventional pressing processes
optimized energy balance, energy saving
What can it NOT be used for?
|Operations||Any other than separation|
|Other limitations||not known|
|Risks or hazards||not known|
|Maturity|| The method is patented for France with international extension, and licenses are available through INRA Transfert
For the moment no implementation is known.
|Modularity /Implementation||This technology could replace the existing dewatering device in the production line, yet the scale up has to be performed.|
|Consumer aspects||not known|
|Legal aspects||The technology is patented for France with international extension: FR2923587, PCT WO2009/095556 (2007)|
|Environmental aspects||Reduced energy consumption compared to conventional pressing processes|
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|References|| 1. Fernandez M.A., Auduc B., Arlabosse P., and Mahmoud A. 2009. Method for mechanical dehydration with thermal assistance. WO2009095556 FR2923587, EP2212637
2. Saalasti T. 2000. Method and a device for improving liquid removal. US6076279
3. Steinemann Geb H. 2000. Water removal from contaminated residues in concrete pans heated at the base and covered by a semipermeable membrane. DE19860181
4. Mahmoud A., Fernandez A., Chituchi T.M., and Arlabosse P. 2008. Thermally assisted mechanical dewatering (TAMD) of suspensions of fine particles: analysis of the influence of the operating conditions using the response surface methodology. Chemosphere Aug;72(11):1765-73.
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- temperature: lower than the evaporation temperature of the liquid to be eliminatedwarning.png"- pressure: lower than 700 kPa
- temperature: lower than the evaporation temperature of the liquid to be eliminated" cannot be used as a page name in this wiki. moist products Dryers 2.2.1 physical separation other Inra Transfert database of technological offers; contact email@example.com WikiSysop :Template:Review document :Template:Review status