Design and feasibility analysis of a self-sustaining biofiltration system for removal of low concentration $N_2O$ emitted from wastewater treatment plants = 자체하수를 이용한 하수처리장에서 발생되는 저농도의 아산화질소 제거기능의 바이오필터 시스템

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$N_2O$ is a potent greenhouse gas and ozone-depletion agent. In this study, a biofiltration system was designed for removal of $N_2O$ emitted at low concentrations (<200 ppmv) from wastewater treatment plants. A biofiltration system was designed to utilize untreated wastewater from the primary sedimentation basin as the source of electron donor and nutrients and minimize the energy requirement by utilizing gravitational force and pressure differential to direct liquid medium and gas through the biofilter. The experiments performed with laboratory-scale biofilter in two different configurations confirmed the feasibility of the biofiltration system. The biofilter operated with cycling of raw wastewater exhibited up to 94% and 53% removal efficiency with 100 ppmv $N_2O$ in $N_2$ and air, respectively, as the feed gas, corroborating that untreated wastewater can serve as a robust source of electron donor and nutrients. The laboratory-scale biofilter operated with a continuous flow-through of synthetic wastewater attained >99.9% removal of $N_2O$ from $N_2$ background at the gas flowrate up to $2,000 mL \cdot min^{-1}$ and >50% $N_2O$ removal from air background at the gas flowrate of $200 mL \cdot min^{-1}$. nosZ-containing bacterial genera including Flavobacterium (5.92%), Pseudomonas (4.26%) and Bosea (2.39%) were identified from the biofilm samples collected from the oxic biofilter, indicating these organisms were responsible for $N_2O$ removal.
Advisors
Yoon, Suk Hwanresearcher윤석환researcher
Description
한국과학기술원 :건설및환경공학과,
Publisher
한국과학기술원
Issue Date
2018
Identifier
325007
Language
eng
Description

학위논문(석사) - 한국과학기술원 : 건설및환경공학과, 2018.2,[iii, 42 p. :]

Keywords

Nitrous oxide▼abiofilter▼awastewater treatment plants▼anitrous oxide reductase▼amicrobial community; 아산화질소▼a바이오필터▼a하수처리장▼a아산화질소 환원제▼a미생물 군집

URI
http://hdl.handle.net/10203/265597
Link
http://library.kaist.ac.kr/search/detail/view.do?bibCtrlNo=733667&flag=dissertation
Appears in Collection
CE-Theses_Master(석사논문)
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