PURIFYING METHOD AND PURIFYING APPARATUS OF DRAINAGE AND GRANULAR ACTIVATED CARBON USED FOR THE SAME

摘要

PROBLEM TO BE SOLVED: To provide a purifying apparatus of drainage, which can perform purifying treatment for a long period of time while maintaining denitrification efficiency and suspended matter removing efficiency at a high level.SOLUTION: The purifying apparatus of drainage includes a denitrification filtering device which has a filter material layer that is filled with granular activated carbon which has an effective diameter of 2.5-3.5 mm, a uniformity coefficient of 1.3 or less and methylotroph deposited thereto, and can obtain treated water which is subjected to denitrification and filtering treatment by passing drainage to which methanol is added through the filter material layer.