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영어

South Korea's steel industry, a representative industry that uses a large amount of water, has produced various wastewater and is posing various problems for the treatment. In this study, a rolling oil wastewater of“P”steel manufacturer was treated through the ultra-filtration membrane. Results showed that the wastewater was purified over 95 percent despite possible changes in pH or pressure. If the ultra-filtration membrane is used, test results showed, the wastewater could be concentrated about 35 times thicker. Operating time for concentration can be reduced with high pressure. But the optimal pressure is estimated at 1.47 bar since the embrane is more contaminated in accordance with the increase of pressure.
Operating time for concentration could also be reduced by increasing the pH.
Increase in pH is good for the increase of concentration rate or flux of the wastewater. But it should also be taken into consideration that additional chemicals are needed to increase the pH. Wastewater treatment using the ultra-filtration membrane is more efficient than previous air floatation or evaporation methods and less cost in terms of installation and management of facilities. And, therefore, there should be further studies on the ultra-filtration membrane method which has lots of strong points for the wastewater treatment.