포기/비포기 시간비가 다를 경우 휴지기간이 생물학적 floc의 특성에 미치는 영향
(The) Effects of Starvation time on Characteristics of floc in SBR with different Aerobic/Anaerobic Time Ratio
포기/비포기 시간비 휴지기간 floc 활성 슬러지 오염물질;
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Effects of two days starvation period on the treatment efficiencies of organics, nitrogen, phosphorus and characteristics of biological floc for synthetic wastewater in SBR with different Aerobic/Anaerobic time ratio were investigated and effects of aerobic/anaerobic time ratio of 3/1, 2/2 and 1/3 respectively were also studied. Sludge residence time(SRT) was 10 days, hydraulic retention time(HRT) was 20 hours. The synthetic wastewater operated with F/M ratio of 0.1~0.16 kg COD_(Cr)/kg MLSS·day was treated. The effects of aerobic/anaerobic time ratio and 2 days starvation period on floc characteristics were evaluated by the fractal dimension and floc size. For analyzing the fractal dimension of floc, small angle laser light scattering(SALLS) method was applied using Diffraction Particle Sizer. Under steady state before starvation time, removal efficiencies of COD_(Cr), NH_(3)-N, T-N, T-P was increased with increasing aeration time. After 2 days starvation period, the removal efficiencies of pollutants were sharply reduced and the time required to recover to steady state was the fastest in Run #1(3/1) and Run #3(1/3) was the slowest except T-N. The recovery time of T-N was not much different in each aeration time ratio. As the aeration time increased, the size and fractal dimension of floc were increased under the steady state before the starvation time and after that, the recovery time was also that the Run #1(3/1) was faster than others. That means that increased non-aeration time produced the floc with smaller floc size and fractal dimension which deteriorated the settling properties of floc. The fractal dimension of floc was better relatied to the sludge settling properties than the size of floc. The recovery time of floc characteristics appeared faster than that of pollutant removal efficiencies.