Acidogenesis of particulate organic materials of food-waste recycling wastewater and microbial structure

MasterThe purpose of this study was to investigate the relationships between hydrolysis of particulate organic materials (POM) and microorganisms in acidogenic reactors treating Food-waste recycling wastewater (FRW). Hydrolysis efficiency in terms of volatile suspended solid (VSS) reduction was observed in continuous completely stirred tank reactors (CSTRs) with changing hydraulic retention time HRT (1 ― 3 day), pH (4 ― 6), and temperature (25 ― 45oC) and was interpreted by response surface methodology (RSM). Denaturing gel gradient electrophoresis (DGGE) using bacterial 16S rRNA genes were also carried out to investigate acidogenic bacterial community structure. The ten identified acidogenic bacterial microorganisms (ABMs) were selected as target for developing species-specific primers and probe set for use of real time quantitative polymerase chain reaction (QPCR). Each ABM in the acidogenic reactor treating FRW was successfully quantified by using designed primers and probe set. Redundancy analysis (RDA) elucidated the relationships between 16S rRNA gene concentration of ABMs and hydrolysis efficiency

TiO2TiO_2 nanotube의 나노 구조 및 전기적 물성 제어와 에너지 저장 특성에 관한 연구

학위논문(박사) - 한국과학기술원 : 신소재공학과, 2009. 8., [ xii, 124 p. ]Since the discovery of bundled carbon nanotubes (CNTs) in 1991, one dimensional (1D) nanostructure arrays have received great attention due to not only their unique structural characteristics, but also their remarkable electrical, chemical, and optical properties. Meanwhile, properties of the 1D nanostructure could be strongly dependent on different bonding configurations of their elements. From this point of view, understanding and controlled modification of these bonding configurations are very crucial to achieve the higher performance of the 1D nanostructure. Especially the emerging nanotechnology offers great opportunities to improve the performance of existing energy storage systems. Applying nanoscale materials to energy storage offers a higher capacity compared to the bulk counterparts due to the unique properties of nanomaterials such as high surface areas, large surface-to-volume atom ratio, and size-confinement effect. In particular, 1D inorganic nanostructures like tubes and wires exhibit superior photoelectrochemical characteristics because of the combined advantages of small size and 1D morphology. Also hydrogen and lithium can be stored in different 1D nanostructures in various ways, including physical and chemical sorption, intercalation, and electrochemical reactions. A titanium dioxide ($TiO_2$) material, due to its versatile modification and abundance, has been proposed as one of promising structures for advanced energy storage applications. In this study, nitrogen doping effects on highly aligned $TiO_2$ nanotube arrays with their nanostructural and electronic properties has been studied through experimental and density functional theory calculations. Also their energy storage performance as a photoanode of dye sensitized solar cells (DSSC) and anode material of Li ion secondary batteries were evaluated. Based on calculation results, it was experimentally shown that nitrogen medication in $TiO_2$ nanotubes can be a prospective way for t...한국과학기술원 : 신소재공학과

Microbial Community Profiles in Four Different Full-scale Anaerobic Digesters Treating Food Wastewater

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Negative active material for rechargeable lithium battery, preparation method thereof and rechargeable lithium battery comprising thereof

본 발명은 리튬 이차 전지용 음극 활물질, 이의 제조 방법 및 이를 포함하는 리튬 이차 전지에 관한 것으로서, 더욱 상세하게는 금속을 음극 활물질로 사용하는 고용량 리튬 이차 전지의 수명 특성을 개선할 수 있는 리튬 이차 전지용 음극 활물질, 이의 제조 방법 및 이를 포함하는 리튬 이차 전지에 관한 것이다

Titanate Nanostructure And Preparing Method Therefor

본원발명은 타이타네이트 나노구조체에 관한 것으로서, 상기 타이타네이트 나노구조체의 화학식은 AaBbTixOy이며, 상기 A, B는 알칼리 금속이며, 0≤a≤9, 0≤b≤9, 1≤a+b≤18, 1≤x≤10, 2≤y≤20 이며, 상기 a, b, x, y는 정수인 것이 바람직하다. 또한, 본원발명은 타이타네이트 나노구조체의 제조방법에 관한 것으로서, 이산화티타늄 분말과 알칼리 용액을 혼합하여 이산화티타늄 용액을 제조하는 단계 및 상기 이산화티타늄 용액을 120 ~ 180℃의 온도범위에서 12 ~ 72시간동안 수열합성하는 단계를 포함한다. 본원발명의 타이타네이트 나노구조체는 상온에서 수소 흡착 용량이 매우 크기 때문에, 고용량 수소 저장 매체를 제조하는데 있어서 유용한 물질로 사용될 수 있다

Augmentation of pineapple waste for enhancing protein degradation during acidogenesis of food waste-recycling wastewater

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TiO2-xNx nanotubes by selective doping of atomic nitrogen states and method for preparing the same

본 발명은 TiO2-xNx(0.01≤x≤0.2) 나노튜브 및 그의 제조방법에 관한 것으로, 보다 상세하게는 질소 가스로 형성된 플라즈마를 이용하여 TiO2 나노튜브를 처리함으로써 TiO2 구조에서 산소를 부분적으로 질소로 치환하는 공정에 의하여 질소를 원자 단위로 도핑하는 TiO2-xNx 나노튜브의 제조방법에 관한 것이다. 본 발명은 TiO2 나노튜브에 질소가 도핑됨으로써 전자구조가 조절되어 밴드갭(band gap)이 감소함으로 인하여 전도성이 향상되고 광흡수 영역 또한 자외선에서 가시광선 영역으로 확장되어 광, 전기 화학적으로 보다 향상된 응용 성능을 갖는 TiO2-xNx 나노튜브를 제공한다. 이산화티타늄(TiO2) 나노튜브, 플라즈마, 질소 도핑, TiO2-xNx 나노튜

Microbial community structures associated with major organic components degradation in full-scale anaerobic sludge digesters

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Optimizing Ganoderma lucidum Mycelial Production Using Swine Wastewater as a Substrate

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