SINGLE COLUMN TYPE BIOLOGICAL TREATMENT APPARATUS OF ANAEROBIC AND AEROBIC COMBINED TYPE

PROBLEM TO BE SOLVED: To provide a single column type biological treatment apparatus of anaerobic and aerobic combined type capable of achieving short time treatment with few amount of excess sludge generation.SOLUTION: A single column type biological treatment apparatus of anaerobic and aerobic combined type includes a treatment tank 14 into which raw water flows from the bottom and from which treated water flows at the upper part, an anaerobic zone 34 disposed at the lower part of the treatment tank, an aerobic zone 36 disposed above the anaerobic zone, and aeration means 38 installed between the anaerobic zone 34 and the aerobic zone 36 to supply the aerobic zone 36 with air from below. The anaerobic zone 34 has a volume of 15-25% relative to the total volume of the aerobic zone 36 and the anaerobic zone 34. A carrier loaded in the aerobic zone 36 is brown coal having an average particle diameter of 5-10 mm, a void ratio of 30-50%, and an iodine adsorption amount of 300-700 mg/g.SELECTED DRAWING: Figure 1 【課題】 本発明の解決すべき課題は、余剰汚泥の発生量が少なく、且つ短時間処理が可能な単塔式嫌気好気併用型生物処理装置を提供することにある。【解決手段】 原水が下部より流入し、処理水が上部より流出する処理槽１４と、前記処理槽下部に配置された嫌気ゾーン３４と、前記嫌気ゾーン上部に配置された好気ゾーン３６と、前記嫌気ゾーン３４と好気ゾーン３６の間に配置され、好気ゾーン３６に下方より空気を供給する曝気手段３８と、を備え、前記嫌気ゾーン３４は、好気ゾーン３６、嫌気ゾーン３４の合計容量に対し１５〜２５％の容量を有し、前記好気ゾーン３６に充填される担体は、平均粒径５〜１０ｍｍ、空隙率３０〜５０％、ヨウ素吸着量３００〜７００ｍｇ／ｇの褐炭であることを特徴とする単塔式嫌気好気併用型生物処理装置。【選択図】 図１