ORGANIC WASTEWATER TREATMENT METHOD AND APPARATUS

PROBLEM TO BE SOLVED: To provide an organic wastewater treatment method and apparatus that suppress an operation cost by easily controlling the used amount of powdered activated carbon used for treatment of organic wastewater containing hardly decomposable organic matter.SOLUTION: In an organic wastewater treatment method, the electrical conductivity or chloride ion concentration of biologically treated water after biological treatment is measured to estimate soluble COD concentration using a previously obtained calibration curve, the required amount of powdered activated carbon is calculated based on the estimated solubility COD concentration and the COD equilibrium adsorption amount of the powdered activated carbon, and the required amount of the powdered activated carbon is added to the biologically treated water to obtain treated water. 【解決課題】難分解性有機物を含む有機性排水の処理に用いる粉末活性炭の使用量を簡便に制御し、運転コストを抑制した有機性排水の処理方法及び処理装置を提供する。【解決手段】生物処理を経た後の生物処理水の電気伝導率又は塩化物イオン濃度を測定して、予め求めておいた検量線を用いて溶解性ＣＯＤ濃度を推定し、推定した溶解性ＣＯＤ濃度と粉末活性炭のＣＯＤ平衡吸着量とに基づいて粉末活性炭の必要量を算出し、当該粉末活性炭の必要量を当該生物処理水に添加して処理水を得ることを特徴とする、有機性排水の処理方法。【選択図】図１