汚水の均等分配を考慮した最初沈殿池分岐水路の構造について

摘要

For the overall optimization of the sewage treatment plant, properly adjusted distribution of sewage to each facility is indispensable to simplify the structure of both machine and electrical equipment by the representing tank management of the water treatment facilities and increase efficiency of operation management system. In this study, we examined the configuration of the branched channel which is able to evenly distribute to each initial precipitated area and arrangement while focusing on diversion channel into the primary sedimentation tank that is one of the channel that do adjusted distribution in the sewage facility. Concretely, we focus on the branched channel is consisted of two types watercourse combination which are shaped in the form of the letter T and F (defined as respectively T-style and F-style), and we examined the behavior of sewage distribution at two types of watercourse, respectively T-style and F-style by using numerical analysis. Besides, we examined what type of watercourses configuration pattern should be desirable number of divergences required from a uniformity of distribution and an economic point of view.%下水処理場の全体最適化に向けて，水処理施設の代表池管理により機械•電気設備の配置の簡素化と運転管理業務の効率化を行うためには，汚水を各処理施設に適正に分配調整することが欠かせない.本稿では，下水処理場内の分配調整を行う箇所の1つである最初沈殿池への分岐水路に着目し，各最初沈殿池への均等分配が可能となる分岐水路の構造や配置について検討を行った.具体的には，分岐水路が，Tの字の形(T型と定義)と，Fの字の形(F型と定義)という2つの形の水路の組合せで構成されていることに着目し，T型，F型それぞれの水路における汚水分配の挙動を，数値解析により考察した.また，必要とされる分岐数をどのような形の水路の構成パターンとするのが望ましいか，均等分配性と経済性(施設規模)の観点から考察した.