Color and suspended solid removal with a novel coagulation technology

Color and suspended solid removal with a novel coagulation technology
박대원Wonseok Chang
atomized molten slag; coagulation; color removal; suspended solid removal; textile wastewater treatment
Issue Date
Water Science & Technology: Water Supply
VOL 2, NO 5-6, 77-81
A novel coagulation technology using atomized molten slag with ferrous sulfate has been developed to treat a turbid and colored water or wastewater. The atomized molten slag is produced by atomizing the molten slag from the steel-making process. The atomized molten slag has magnetic iron oxide in its constituent molecules so that is is magnetized. In this novel coagulation technology, the atomized molten slag acts as nuclei for coagulation process and wighting agent for the resultant floc. In this study, this new coagulation technology was compared with metal hydroxide flocs such as FeCl₃and PAC in treating textile wastewater. A batch setting test was conducted to invesigate the setting characteristic of sludge formed with the atomized molten slag. The setting velocity of sludge formed with the atomized molten slag is almost ten times graeter than that of sludge formed with FeCl₃ or PAC. The coagulation using the atomized molten slag showed a higher removal rate of color, suspended solid, TOC, COD, TKN and T-P. The atomized molten slag is capable of adsorbing organic substance, ammonia and phosphate. This characteristic leads to higher removal rate than FeCl₃or PAC. The gel permeation chromatograghy of the wastewater treated using the atomized molten slag illustrated that this novel coagulation technology is more efficient in removing the particles with low molecular weight. The removal retes of color, suspended solid, COD, TOC, ammonia and phosphorous increase with increasing amount of atomized molten slag addition. Even though the atomized molten slag was overdosed, restabilization of particles was not encountered.
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