NITROGEN REMOVAL EQUIPMENT AND MODIFICATION METHOD OF NITROGEN REMOVAL EQUIPMENT

PROBLEM TO BE SOLVED: To provide nitrogen removal equipment achieving further stable nitrogen removal, and a modification method of nitrogen removal equipment.SOLUTION: Nitrogen removal equipment 1 is provided that comprises: a reaction chamber 3 composed of a single chamber having an aerobic treatment zone A2 and an anaerobic treatment zone A1 and subjecting water to be treated W1 containing organonitrogen compounds to biological denitrification; a raw water supply pipe 8 for supplying the reaction chamber 3 with the water to be treated W1; a partition wall 15 for partitioning a liquid phase part of the reaction chamber 3 into the aerobic treatment zone A2 and the anaerobic treatment zone A1; a raw water charging port which is formed in the reaction chamber 3 and is an outlet of the raw water supply pipe 8; a communication port 19 which communicates the anaerobic treatment zone A1 with the aerobic treatment zone A2, and is provided at a position of the partition wall as distant as possible from the raw water charging port; and a circulation flow passage 11 for circulating water to be treated W2 from the aerobic treatment zone A2 to the most upstream part of the anaerobic treatment zone A1.SELECTED DRAWING: Figure 1 【課題】より安定した窒素除去を可能とする窒素除去装置、及び窒素除去装置の改造方法を提供する。【解決手段】好気性処理領域Ａ２と嫌気性処理領域Ａ１とを有し、有機性窒素化合物を含有する被処理水Ｗ１の生物学的脱窒を行う単一槽からなる反応槽３と、反応槽３へ被処理水Ｗ１を供給する原水供給管８と、反応槽３の液相部を好気性処理領域Ａ２と嫌気性処理領域Ａ１とに区画する隔壁１５と、反応槽３に形成された原水供給管８の出口である原水投入口と、隔壁上の原水投入口から可能な限り離れた位置に設けられて嫌気性処理領域Ａ１と好気性処理領域Ａ２とを連通させる連通口１９と、好気性処理領域Ａ２から嫌気性処理領域Ａ１の最上流部へ被処理水Ｗ２を循環させる循環流路１１と、を有する窒素除去装置１。【選択図】図１