Economic Evaluation of Wastewater Treatment System Based on Recovery Characteristics of Oil and Suspended Solids by Filtration

摘要

水温20℃と60℃の模擬排水を用いて濾過実験をおこない，油の濃度に対する油水分離装置の分離性能とSS回収装置の回収率の関係を明らかにした。濾過実験で明らかになった油とSSの濾過特性にもとづき，油水分離装置を用いてSS回収装置を用いない単独使用（single use)と.油水分離装置とSS回収装置を使用する併用使用（combination use)の2条件に対じr.分離作業量（SWU)を用レゝて排水処理システムの経済性評価手法の提案を行った。油水分離装置の分離性能が決まることによって.必要なSS回収装置の回収率が決定された。水温20℃と60℃における併用使用の分離作業量は.単独使用の分離作業量よりも高い値を示した。水温60℃における併用使用の分離作業量は水温20℃における併用使用の分離作業量よりも高い値を示した。我々が行った濾過実験実験での水温60℃の条件において，併用使用では.単独使用に比べて油水分離性能が45%のとき分離作業量せ562円/曰（処理量3.000 L/日）上昇した。%Filtration experiments were conducted using artificial wastewater at 20 ℃ and 60 ℃ to explain the relationship between the separation ability of oil-water separation equipment and the recovery rate of suspended solids (SS) recovery equipment for oil concentrations. Based on the characteristics of oil and SS explained by the filtration experiments, an economic evaluation method for a wastewater treatment system was proposed for two cases: using oil-water separation equipment without SS recovery equipment (single use) and using oil-water separation equipment with SS recovery equipment (combination use) using Separative Work Unit (SWU). The separation ability of oil-water separation equipment could determine the required recovery rate of SS recovery equipment. The SWU for combination use at 20 ℃ and 60 ℃ was higher than the SWU for single use. The SWU for combination use at 60 ℃ was higher than that at 20 ℃. At 60 ℃, combination use increased the SWU by 562 JPY/day (treatment amount 3,000 L/day) compared to single use, at 45% separation ability of the oil-water separation equipment according to the results of our filtration experiments.