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Control of CaSO sub(4) scale formation in membrane distillation by seeded crystallization and in-line filtration
Ist Teil von
Desalination and water treatment, 2016-11, Vol.57 (51), p.24654-24661
Erscheinungsjahr
2016
Link zum Volltext
Quelle
Taylor & Francis Journals Auto-Holdings Collection
Beschreibungen/Notizen
Membrane distillation (MD) is a novel technology that can be used for zero liquid discharge (ZLD) or near-ZLD systems. However, a limiting factor affecting the effectiveness of MD for ZLD applications is membrane fouling due to scale formation. Accordingly, this study intended to develop technologies to alleviate scaling of MD membranes by applying seeded crystallization and in-line filtration. Experiments were carried out using a laboratory-scale direct contact MD (DCMD) system in a batch concentration mode. A saturated solution of CaSO sub(4) was used as a model scale-forming salt and its crystal particles were intermittently added to the feed tank as nuclei to induced seeded crystallization. In addition, a stainless steel mesh filter with the nominal pore size of 2 mu m was applied as an in-line filtration to continuously remove suspended crystal particles from the recirculating brine. Results showed that the antiscaling effect of the seeded crystallization depends on the way of crystal particle addition. The in-line filtration was found to be also effective to retard fouling due to scale formation. The combination of seeded crystallization and in-line filtration, however, does not seem to have synergic effect.