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28 results on '"Oh, Sae-Eun"'

13. Response surface optimization of substrates for thermophilic anaerobic codigestion of sewage sludge and food waste

Author

Kim, Hyun-Woo, Shin, Hang-Sik, Han, Sun-Kee, and Oh, Sae-Eun

Subjects
Sewage sludge digestion -- Research -- Usage -- Methods, Biochemical toxicology -- Research -- Methods -- Usage, Refuse and refuse disposal -- Methods -- Research -- Usage, Statistical methods -- Usage -- Methods -- Research, Environmental services industry, Environmental issues, Science and technology
Abstract

ABSTRACT This study investigated the effects of food waste constituents on thermophilic (55 °C) anaerobic codigestion of sewage sludge and food waste by using statistical techniques based on biochemical methane [...]

Published
2007

17. Assessment of water quality and Algae growth for the Ganwol reservoir using multivariate statistical analysis.

Author

Liu, Zihan, Joo, Jin Chul, Kang, Eun Bi, Kim, Jin Ho, Oh, Sae-Eun, and Choi, Sun Hwa

Subjects
WATER quality, ALGAL growth, MULTIVARIATE analysis, FACTOR analysis, PRINCIPAL components analysis, WATER quality monitoring, RESERVOIRS
Abstract

Comprehensive multivariate statistical techniques (i.e. analysis of variance, correlation analysis, principal component analysis and factor analysis, and multiple linear regression model) were applied to evaluate both temporal and spatial variations in 13 water quality parameters of eutrophic Ganwol reservoir collected on monthly basis for three years (2014–2016). From the results of comprehensive multivariate statistical techniques, both temporal and spatial variations in nutrient concentrations (N and P) inside the Ganwol reservoir were found to be substantial. Also, the water quality of each monitoring site was affected by variations in loadings of natural and anthropogenic factors from various pollution sources. Both principal component analysis and factor analysis were successfully applied to identify important components/factors accounting for most of the variance of whole water quality of Ganwol reservoir, and to generate different numbers of varifactors (VFs) of latent pollution sources/factors for each monitoring sites. Finally, multiple linear regression analysis using VFs as independent variables reasonably estimated the eutrophic state (Chl-a) of Ganwol reservoir. Therefore, comprehensive multivariate statistical techniques can identify both temporal and spatial variations in complex water quality parameters and in different loadings of natural and anthropogenic factors, convert huge water quality parameter structures into simpler factor structures (i.e. VFs), and offer a valuable site-specific solution for reliable management of agricultural reservoir. [ABSTRACT FROM AUTHOR]

Published
2020
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18. Continuous Anaerobic Digestion of Food Waste and Paper Waste under Mesophilic-Dry Condition

Author

Dong-Hoon Kim, Mo-Kwon Lee, and Oh，Sae-Eun

Subjects
Environmental Engineering, Waste management, Hydraulic retention time, Continuous operation, Chemistry, Health, Toxicology and Mutagenesis, Ecological Modeling, Chemical oxygen demand, Total dissolved solids, Pollution, Anaerobic digestion, Waste treatment, Food waste, Biogas, Waste Management and Disposal, Water Science and Technology
Abstract

With increasing concerns regarding the limited capacity of landfill, conservation of resources, and reduction of CO2 emissions, dry anaerobic digestion of organic solid waste has recently been gaining considerable attention. However, there have been few reports on continuous operation and most have involved operation under thermophilic condition. In the present study, a continuous dry anaerobic digestion system treating a mixture of food waste and paper waste was operated under mesophilic condition. For easy injection of a solid type substrate, the feed was diluted six-fold with the sludge inside the reactor, and then, fed into the reactor. During the operation, hydraulic retention time (HRT) decreased as follows: 150, 100, 60, 40, and 30 d at a fixed substrate concentration of 30% total solids (TS), corresponding to a solid loading rate (SLR) of 2.0, 3.5, 5.0, 7.5, and 10.0 kg TS/m3/d, respectively. Up to 40 d of HRT, biogas production proportionally increased as SLR increased, but at 30 d of HRT, biogas production decreased. At further operation, instead of controlling HRT, substrate concentration was increased to 40% TS, which was found to be a better option for increasing the treatability. The system could achieve a stable CH4 production yield of 0.27 m3 CH4/kg TSadded and 0.25 m3 CH4/g CODadded, and over 75% of volatile solids (VS) reduction.

Published
2010

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