SEWAGE TREATMENT SYSTEM

• Main Authors: KITAMURA KOTARO, NISHIDA YOSHIKI, ENBUTSU ICHIRO
• Format: Patent
• Language: English; Japanese
• Published: 21.06.2022
• Subjects: CHEMISTRY; METALLURGY; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

To provide a sewage treatment system capable of estimating an SS concentration of treated water, displaying results of this estimation as operation support information, and providing operation support to an operation manager.SOLUTION: A sewage treatment system has: a reaction tank 2 for treating treatment target water 100; a final sedimentation basin 3 for settling and separating activated sludge from effluent water flowing out of the reaction tank and allowing treated water 104 to flow out; an influent water amount estimation part 8 for estimating a flow rate of influent water 101 flowing into the reaction tank; and an MLSS meter 11 for measuring a concentration of activated sludge (MLSS) in the reaction tank. The sewage treatment system further has: a sludge interface height estimation part 14 for estimating a height of a sludge interface in the final sedimentation basin based on an output value in the influent water amount estimation part and an output value in the MLSS meter; a treated water quality estimation part 15 for calculating an overflow/clearness ratio based on an output value in the sludge interface height estimation part and an output value in the influent water amount estimation part, and estimating the quality of the treated water based on the overflow/clearness ratio; and an operation support information display part 16 for displaying an output value in the treated water quality estimation part.SELECTED DRAWING: Figure 1 【課題】処理水のＳＳ濃度を推定し、運転支援情報としてこの推定結果を表示し、運転管理者に対して運転支援する下水処理システムを提供する。【解決手段】被処理水１００を処理する反応槽２と、反応槽から流出する流出水から活性汚泥を沈降分離し、処理水１０４を流出する最終沈殿池３と、反応槽へ流入する流入水１０１の流量を推定する流入水量推定部８と、反応槽内の活性汚泥（ＭＬＳＳ）濃度を計測するＭＬＳＳ計１１と、を有し、更に、流入水量推定部における出力値とＭＬＳＳ計における出力値とに基づいて、最終沈殿池の汚泥界面高さを推定する汚泥界面高さ推定部１４と、汚泥界面高さ推定部における出力値と流入水量推定部における出力値とに基づいて、越流／清澄比を算出し、越流／清澄比に基づいて、処理水の水質を推定する処理水水質推定部１５と、処理水水質推定部における出力値を表示する運転支援情報表示部１６と、を有する構成とする。【選択図】図１