침전 가속화제로서 열처리 탈수 케익을 이용한 하수처리장 미생물의 침강성 개선 평가

It has been considered that a lot of informations for a affecting parameters and operating techniques are required to meet the water quality standards of effluent from sewage treatment plants (STPs). As a technical diagnosis point of view, the condition and performance of the clarifier is one of an important parameters directly affecting the water quality of effluent in STPs. The solid-liquid separation capability in clarifier is strongly dependent on the microbial settleability. As a result, the performance in STPs where microbial settleability reductions may cause deteriorates in the solid-liquid separation capability at the clarifier, and gradually deteriorates the water quality of effluent. This study was conducted to increase and stabilize the microbial settleability within a short period of time by dosing the thermal-treated sludge cake (TSC) as sedimentation accelerating additives when the microbial settleability deteriorates in STPs. All the results with the TSC were compared with magnetite samples as weighted coagulation Additives (WCA). The settling velocity of sludge formed with the TSC is almost 2 times faster than that of control sample. In the result, the TSC was proved to be the promising material for efficient sedimentation accelerating additives (SAA), because it led to similar sedimentation than other WCA.