曝氣에 의해 廢水가 內部 循環되는 沈漬形 膜生物反應器의 廢水處理 特性

Abstract

The objectives of this research were to develop submerged membrane bioreactor(SMBR) being capable of internal circulation by aeration. The wastewater treatment characteristics of SMBR designed in this study were investigated. In this experiments, a couple of flat-sheet microfiltration membranes made of PVC with a pore size of 0.4 ㎛ were used. It was confirmed that wastewater in anaerobic region was circulated to aerobic region by aeration. Mixed liquor suspended solid(MLSS) concentrations in the aerobic region of MSBR were decreased with operation time. To prevent the decrease of MLSS concentrations in the aerobic region, various kinds of method were tried. In this experiments, MLSS concentrations in the aerobic region were in the range of 3,030∼506 mg/L during 43 days of run. As MLSS concentrations in the aerobic region were decreased, the removal efficiencies of total nitrogen and total phosphorous were decreased. But the removal efficiencies of COD were not effected by MLSS concentrations. The average removal efficiencies of COD, total nitrogen, and total phosphorous were 99.53%, 58.46%, and 42.39%, respectively.