Journal of the Korean Society of Mineral and Energy Resources Engineers ISSN:2288-0291(Print) 2288-2790(Online) 한국자원공학회지

In case of removing COD in wastewater which has different concentration of phosphate, this study aims to investigate correlations among media applied systems such as activated carbon, ceramic apatite and ceramic calcite. In the case of wastewater (P : 0), COD was lower than 10 ppm at ceramic apatite and in the case of wastewater (N / P : 5 / 1), COD was respectively 50 ppm and 10 ppm at ceramic calcite and ceramic apatite. It could be found out that ceramic calcite and ceramic apatite had a higher removing rate of COD as 50 ppm and 10 ppm effluent than that of other ceramic industrial minerals. In the case of wastewater (N / P : 1.5 / 1), ceramic industrial minerals had higher removing efficiency of COD than that of activated sludge system. Ceramic calcite had a low T-P value 2 ppm, regardless of the quantity of phosphorus. This is owing to CaCO3 precipitation which follows Ca2+- CO2 reaction where Ca2+ ion comes from CaO and CO2 gas is generated from microorganism-decomposed organic matter. It alsocould be known by XRD analysis that P ion in wastewater bonds to precipitate as calcium phosphate.