|Removal of dissolved contaminants, by using a suitable extracting solvent.
|The water flow and the solvent stay completely separated by using a membrane. The solvent flow is in principle much smaller than the water flow (approx. factor 1000 or more).
Description including main features/advantages
The water flow and the solvent flow move counter currently through one or more membrane modules. The counter current modus may result in very high removal of the contaminant using very low amounts of solvent. Commercial membrane modules are preferred for a cost effective process. Selection of best type of solvent may need laboratory experiments and market evaluations. Typically, one prefers:
a) low cost solvent in the case waste disposal is required (incineration)
b) a solvent which allows recycling/recovery in the process (e.g. by distillation)
c) a solvent to produce a valuable product
In order to reduce cross contamination of the water with the solvent, the solvent should show very low water solubility. In a specific variant of the process, the membrane acts as an air gap. This variant is only suitable for (very) volatile contaminants, such as halomethanes. But also it is also suitable for ammonia (after pH adjustment). Innovative aspects
Ease of separating the two phases, when compared to conventional extracting processes. Foaming and other operational problems are avoided. Very low energy requirements for the ‘mixing’ step. Current and potential industrial users/domains of application
Various applications may be found in chemical industry. Current state of development
First applications have been successfully introduced in the market:
- recovery of valuable chemicals by using an common solvent in chemical industry
- recovery of ammonia from wastewater
P.O. Box 342
7300 AH Apeldoorn
+31 88 8662179
|TRL - technology readiness level
|5 Prototipo in grande scala o scala reale.
|Topic di ricerca
|2.5.2 Trattamento reflui industriali
|Topic di ricerca collegati
Il Laboratorio ha realizzato progetti finanziati dai Fondi europei della Regione Emilia-Romagna e dal Fondo per lo sviluppo e la coesione
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