Abstract
Water purification plants those treat organic polluted water are making efforts to manage it by applying additional biological treatment process.
It is anticipated that the replacement of filter sand to granular activated carbon has a high feasibility to remove pollutants. Therefore, the comparison of activated carbon and sand from the view points of their removability against turbid substances, ammonium nitrogen, soluble iron, and soluble manganese were implemented by using demonstration plant in this report.
Following results were obtained ;
1. When after activated carbon and sand were covered by microorganisms, the quantity of turbid substances removed within an unit filter operation were decreased, and also filter running time was shorten. However activated carbon worked better than sand, regardless of the quality of turbid substance and the flow rate.
2. Granular activated carbon filter showed better removability of ammonium nitrogen than that of sand filter. It was possible to oxidize 2mg of ammonium nitrogen per liter at the experimental conditions.
3. Both media removed soluble iron completely, but they did not removed soluble manganese.
