Effects of Activated Carbon and Cationic Exchange Resin Pretreatments on Groundwater Defluoridation by Reverse Osmosis Process
| Autor: | Suraphong Wattanachira, Aunnop Wongrueng, Satoshi Takizawa, Pharkphum Rakruam, Praphasiri Chantharawong |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
0208 environmental biotechnology 02 engineering and technology 010501 environmental sciences Osmosis 01 natural sciences reverse osmosis chemistry.chemical_compound medicine Fluoride Reverse osmosis membrane fouling 0105 earth and related environmental sciences Chromatography Membrane fouling General Engineering 020801 environmental engineering Membrane chemistry Chemical engineering lcsh:TA1-2040 Scientific method permeate flux lcsh:Engineering (General). Civil engineering (General) Groundwater Activated carbon medicine.drug |
| Zdroj: | Engineering Journal, Vol 21, Iss 2 (2017) |
| ISSN: | 0125-8281 |
| Popis: | The objective of this research was to study the effects of a pretreatment using activated carbon and cationic exchange resin on groundwater defluoridation by a reverse osmosis membrane. Actual groundwater containing a high fluoride concentration was collected and examined. Experiments were operated under controlled conditions: a transmembrane pressure of 0.6 MPa and temperature of 25 °C. The reverse osmosis system with activated carbon and cationic exchange resin pretreatments had higher fluoride removal than the one without the pretreatments, 97% compared to 95%, respectively. Additionally, the reverse osmosis system with the pretreatments also produced a higher permeate flux, 1.1 A— 10-5 compared 9.6 A— 10-6 m3/m2•s without the pretreatment. When the reverse osmosis systems with and without pretreatments were fouled, they showed a decrease in fluoride rejection, as well as a permeate flux decline. After the fouled reverse osmosis membranes were chemically cleaned, the permeate flux recovery and the fluoride rejection of the osmosis system with the pretreatments improved. It could be concluded that the activated carbon and cationic exchange resin played an important role in improving the reverse osmosis system as they contributed to high fluoride rejection and high permeate flux. |
| Databáze: | OpenAIRE |
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