NITRIFICATION AND DENITRIFICATION EQUIPMENT

摘要

PURPOSE:To efficiently execute nitrification and denitrification treatments by respectively forming denitrification vessels which are partitioned to two vessels, upper and lower, by partition walls and have raw water inflow ports in the lower story and nitrification vessels which have outflow water paths for treated water in the upper story and circulate liquids in order of the outflow water paths, pipings and the inflow water paths between the nitrification vessels and the denitrification vessels. CONSTITUTION:The nitrification and denitrification equipments 14 of a biological reaction plate 10 adjacently provided with an aeration tank 12 and plural sets of the nitrification and denitrification equipment 14 are composed by segmenting the main bodies to the nitrification vessels 28 and the denitrification vessels 20 by the partition walls 26. The outflow water paths 38 disposed in the nitrification vessels 28 and the inside of the denitrification vessels 20 are communicated by communicating pipes 52. The inside of the denitrification vessels 20 and the inflow water paths 54 disposed in the nitrification vessels 28 are communicated by communicating pipes 55. The liquid is circulated between both vessels 28 and 20 by the air lift effect from air diffusers 3 of the nitrification vessels 28. As a result, the air 66 from the air diffusers 33 or the liquid of the nitrification vessels 28 having the high concn. of dissolved oxygen are prevented from short passing into the denitrification vessels 20, by which the increase of dissolved oxygen in the denitrification vessels 20 is prevented.