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Developmemt of Rice Husk Pellets as Bio-filter Media of Bio Scrubber Odor Removal System

왕겨펠렛 생물담체 개발 및 이를 이용한 bio scrubber형 악취제거 시스템 성능평가

  • Bae, Jiyeol (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Han, Sangjong (Research Strategic Planning Department, Korea Institute of Civil Engineering and Building Technology) ;
  • Park, Ki Ho (KED Co., Ltd) ;
  • Kim, Kwang-Soo (Department of Land, Water and Environment Research, Korea Institute of Civil Engineering and Building Technology)
  • 배지열 (한국건설기술연구원 국토보전연구본부) ;
  • 한상종 (한국건설기술연구원 연구전략기획본부) ;
  • 박기호 (주식회사 케이디) ;
  • 김광수 (한국건설기술연구원 국토보전연구본부)
  • Received : 2018.06.29
  • Accepted : 2018.08.26
  • Published : 2018.08.31

Abstract

The rice husk contains nutrients which can be easily utilized by microorganisms, and also has a water retaining ability, which played a crucial part in enabling it to become a biofilter media. In this study, we evaluated the applicability of rice husk pellet bio-scrubber as a microbiological carrier. The pelletization experiment of rice husk as a biological media was performed using PVA and EVA binder. Also, the feasibility tests of rice husk as a biological media for odor removal were carried out in order to know whether rice-husk contains useful components as a media for microbiological growth or not. Lastly, a combined test for odor gas absorption and biological oxidation was conducted using a lab scale bio-filter set-up packed with rice-husk pellets as wet-scrubber. The major components of the rice husk were carbon, hydrogen, nitrogen, and oxygen, while carbon acted as the main ingredient which comprised up to 23.00%. The C : N : P ratio was calculated as 45 : 1 : 2. Oxygen uptake rate, yield and decay rate of the rice husk eluent was calculated to be $0.0049mgO_2/L/sec$, 0.24 mgSS/mgCOD and 0.004 respectively. The most stable form of rice husk pellets was produced when the weight of the rice husk, EVAc, PVAc, and distilled water was 10 : 2 : 0.2 : 10. The prepared rice husk pellets had an apparent density of 368 g/L and a porosity of 59.00% upon filling. Dry rice husks showed high adsorption capacity for ammonia gas but low adsorption capacity for hydrogen sulfide. The bio-filter odor removal column filled with rice husk pellets showed more than 99.50% removal efficiency for NH3 and H2S gas. Through the analysis of circulation water, the prime removal mechanism is assumed to be the dissolution by water, microbial nitrification, and sulfation. Finally, it was confirmed that the microorganisms could survive well on the rice husk pellets, which provided them a stable supply of nutrients for their activity in this long-term experiment. This adequate supply of nutrients from the rice husk enabled high removal efficiency by the microorganisms.

Acknowledgement

Supported by : 환경산업기술원

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