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Objective & Scope
1. Characterization of Ozone, Ozone/UV, BAC system 2. Improvement of systems 3. Modeling of systmes Main Contents As many sources for drinking water go worse with a kind of pollutants from industrial and municipal wastewater, it has been more and more difficult to treat water clean to drink, pleasant in taste and suitable to use, by means of conventional water treatment system. Nowadays ozone and biological activated carbon(BAC) system have been developed to remove THM precursors, organic and inorganic compounds by oxidation and adsorption and prevent distribution systems from bacterial regrowth by removing BDOC and ammonia. In this study, ozone, ozone/UV, and BAC system were applied to develop water treatment technology in pilot-scale plant located at water treatment plant in POSCO. Ozone and ozone/UV for oxidation and two types of activated carbon were compared to evaluate their the performance. Ozene/UV process was more effective than ozone process in UV absorbance removal and effectively converted NBDOC to BDOC. But, their efficiencies were similar in DOC and NH3-N removal. Coal-based activated carbon was more effective than wood-based activated carbon in DOC removal. So, the adsorption seemed to play a key role in the removal of DOC. As the removal of NH3-N was dependent on the activities of microorganisms, wood-activated carbon was better because of lots of macropores for bacteria growth. The structure of macropores and microorganisms on the surface of wood-based activated carbon were investigated by SEM. In additon, novel biological activated carbon system (NBS) has been tested to modify some problems which can result from operations with conventional biological activated carbon system. References 1) Application of ozone, ozone/UV and biological activated carbon systems and development of novel activated carbon system for drinking water treatment Seong Rin Lim, Thesis of Master (1997), POSTECH, KOREA Related Patents 1) Reactor system with multi-layer matrices immobilized by microorganisms and its application to drinking water treatment J.M. Park and S.L. Lim, Korea Patent (1999) |
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