| Autor: |
Narimani, Mostafa, Ardjmand, Mehdi, Tabatabaee Ghomsheh, Seyed Mostafa, Safekordi, Ali Akbar |
| Předmět: |
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| Zdroj: |
Desalination & Water Treatment; Dec2018, Vol. 136, p83-91, 9p |
| Abstrakt: |
The objective of the study was to develop the cleaning performance of the RO membrane with direct osmosis at high salinities (DO-HS) method. Lactate salts were selected as new draw solutions in order to create the required osmotic pressure. This technique is a new backwash method by intermittent injection of the high salinity solution without stopping of high pressure pump. DO-HS trials were carried out with an RO pilot system which was operated on site with the synthetic groundwater as the raw feed. Different operating conditions for DO-HS treatment in the actual process were investigated. A short injection of feed water with increased salt concentrations (1.5 M) with an associated osmotic pressure of 105.32 bar overcomes feed pump gauge pressure and reverse osmosis shifts to direct osmosis, leading to a permeate backwash stream through the RO membrane. The results showed that the fouling could be almost fully reversible and the membrane needed to be cleaned for about 2 min (12 pulse injection) because of the appearance of all salts on membrane surface at the fouling time of 10 d. Most importantly, the DO-HS technology is very effective in keeping the membrane continuously clean and ensuring stable permeate production. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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