• Environmental Engineering Research
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• 제19권4호
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• pp.395-399
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• 2014

Operation characteristics of the sequencing batch reactor (SBR) process with electro-flotation (EF) as a solid liquid separation method (EF-SBR) were investigated. EF-SBR process showed excellent solid-liquid separation performance which enabled to separate biosolids from liquid phase within 30 min and to extend cyclic reaction time. Although influent organic loading rate was increased stepwise from 5 to 15 g COD/day, food to microorganisms (F/M) ratio could be maintained about 0.3 g COD/g VSS/day in EF-SBR because biomass concentration could be easily controlled at desired level by EF. However, it was impossible to increase biomass concentration at the same level in control SBR (C-SBR) process because solid-liquid separation by gravity settling showed a limitation at higher mixed liquor suspended solids (MLSS) concentration with 60 min of settling time. Total chemical oxygen demand (TCOD) removal efficiency of EF-SBR process was not decreased although influent organic loading rate became 3 times higher than initial value. However, it was seriously deteriorated in C-SBR process after increasing the rate over 10 g COD/day, which was accounted for insufficient organic removal by relatively higher food to microorganisms (F/M) ratio as well as biosolids wash-out by a limitation of gravity sedimentation.

• 한국습지학회지
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• 제16권4호
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• pp.423-431
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• 2014

상수원과 같은 수계 수질 보호 및 농촌 지역 개발을 위해 마을하수도 보급이 필요하다. 본 연구에서는 안동 지역 마을하수도(11개소) 유입하수 특성 및 마을하수도에 도입된 처리 공법의 결과를 분석하였다. 안동 지역 마을하수도 유입하수는 도시지역에 비해 고농도의 유기물과 영양염류를 함유하고 있는 것으로 분석되었다. 안동시 마을하수도 공법은 안정적인 처리효율을 보였지만, 영양염류의 경우 유기물에 비해 solid retention time(SRT)와 food to microorganisms (F/M) ratio에 민감한 것으로 나타났다. 또한 안동 지역 마을하수도 공법은 타 공법($A^2/O$, SBR, media)들과 비교하여 전반적으로 높은 처리 효율을 보였으며, 본 공법은 마을하수도에 효과적으로 적용 가능한 공법이라 판단된다.