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대한환경공학회> Environmental Engineering Research (EER)

Environmental Engineering Research (EER)

Environmental Engineering Research (EER)

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수록정보
수록범위 : 1권1호(1996)~21권3호(2016) |수록논문 수 : 718
Environmental Engineering Research (EER)
21권3호(2016년 09월) 수록논문
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KCI등재 SCOPUS

1Can cities become self-reliant in energy? A technological scenario analysis for Kampala, Uganda

저자 : Nicholas Munu , Noble Banadda

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 219-225 (7 pages)

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Energy self-reliance is important for economic growth and development for any nation. An energy self-reliance technological analysis for Kampala the capital city of Uganda is presented. Three renewable energy sources: Municipal Solid Waste (MSW), solar and wind are assessed for the period of 2014 to 2030. Annual MSW generation will increase from 6.2 × 105 tons in 2014 to 8.5 × 105 and 1.14 × 106 tons by 2030 at 2% and 3.9% population growth respectively. MSW energy recovery yield varies from 136.7 GWh (2014, 65% collection) to 387.9 GWh (2030, 100% collection). MSW can at best contribute 2.1% and 1.6% to total Kampala energy demands for 2014 and 2030 respectively. Wind contribution is 5.6% and 2.3% in those respective years. To meet Kampala energy demands through solar, 26.6% of Kampala area and 2.4 times her size is required for panel installation in 2014 and 2030 respectively. This study concludes that improving renewable energy production may not necessarily translate into energy self-reliant Kampala City based on current and predicted conditions on a business as usual energy utilization situation. More studies should be done to integrate improvement in renewable energy production with improvement in efficiency in energy utilization.

KCI등재 SCOPUS

2A mathematical spatial interpolation method for the estimation of convective rainfall distribution over small watersheds

저자 : Shengtang Zhang , Jingzhou Zhang , Yin Liu , Yuanchen Liu

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 226-232 (7 pages)

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Rainfall is one of crucial factors that impact on our environment. Rainfall data is important in water resources management, flood forecasting, and designing hydraulic structures. However, it is not available in some rural watersheds without rain gauges. Thus, effective ways of interpolating the available records are needed. Despite many widely used spatial interpolation methods, few studies have investigated rainfall center characteristics. Based on the theory that the spatial distribution of convective rainfall event has a definite center with maximum rainfall, we present a mathematical interpolation method to estimate convective rainfall distribution and indicate the rainfall center location and the center rainfall volume. We apply the method to estimate three convective rainfall events in Santa Catalina Island where reliable hydrological data is available. A cross-validation technique is used to evaluate the method. The result shows that the method will suffer from high relative error in two situations: 1) when estimating the minimum rainfall and 2) when estimating an external site. For all other situations, the method`s performance is reasonable and acceptable. Since the method is based on a continuous function, it can provide distributed rainfall data for distributed hydrological model sand indicate statistical characteristics of given areas via mathematical calculation.

KCI등재 SCOPUS

3Study of different flexible aeration tube diffusers: Characterization and oxygen transfer performance

저자 : Narapong Hongprasith , Natchanok Dolkittikul , Kamolnapach Apiboonsuwan , Wiboonluk Pungrasmi , Pisut Painmanakul

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 233-240 (8 pages)

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The research aims to study the different flexible rubber tube diffusers used in urban wastewater treatment processes and aquaculture systems. The experiment was conducted in small-scale aeration tank with different physical properties of the tubes that were used as aerators. The volumetric mass transfer coefficient (kLa), oxygen transfer efficiency (OTE) and aeration efficiency (AE) were measured and determined to compare the diffusers. Moreover, the bubble hydrodynamic parameters were analyzed in terms of bubble diameter (dB) and rising velocity (UB) by a high speed camera (2,000 frames/s). Then the interfacial area (a) and liquid-side mass transfer coefficient (kL) can be calculated. The physical properties (tube wall thickness, tensile strength, orifice size, hardness and elongation) have been proven to be the key factor that controls the performance (kLa and OTE). The effects of hardness and elongation on bubble formation, orifice size and a-area were clearly proved. It is not necessary to generate too much fine bubbles to increase the a-area: this relates to high power consumption and the decrease of the kL. Finally, the wall thickness, elongation and hardness associated of the flexible tube diffuser (tube No. 12) were concluded, to be the suitable properties for practically producing, in this research.

KCI등재 SCOPUS

4Emission characteristic of ammonia in cement mortars using different sand from area of production

저자 : Hongseok Jang , Hyoungseok So , Seungyoung So

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 241-246 (6 pages)

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This paper discusses the influence of organic matter contained in aggregate on the emission characteristic of ammonia (NH3) from cement mortar. NH3 can be released to indoor-outdoor environment through diffusion in mortar (or concrete) and have resulted in the increasing air pollution, and especially well known as a harmful gas for the human body. The concentration of NH3 released from cement concrete was then compared to the contents of organic matter contained in the aggregate. The result indicates that the contents of organic matter in the aggregate significantly differ with types of aggregate from different areas of production. The organic matter becomes organic nitrogen through the process of microbial breakdown for a certain period and pure ammonium ion (NH4+) is produced from the organic nitrogen. The NH4+ was reacted with alkaline elements in the cement and released as NH3 from cement concrete through a volatile process. The released NH3 was proportional to the contents of NH4+ adsorbed in the aggregate from different areas of production and the concentrations of NH3 emission from cement mortar according to the aggregate differ by more than 4 times.

KCI등재 SCOPUS

5Trace elements analysis in some medicinal plants using graphite furnace-atomic absorption spectroscopy

저자 : Jasha Momo H. Anal , Petevino Chase

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 247-255 (9 pages)

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Ten trace elements (Mg, Ca, V, Cr, Mn, Fe, Cu, Zn, Mo, and Cd) were determined in seven traditionally used wild medicinal plants of the Nagas in the North-East India viz Cynoglossum furcatum Wallich, Elsholtzia blanda Bentham, Lycopodium cernuum Linnaeus, Potentilla fulgens Wallich ex Hooker, Swertia macrosperma C.B. Clarke, Thalictrum foliolosum DC and Valeriana jatamansi Jones. Plant samples were dried, weighed, digested and analyzed for their mineral distribution level ranging from trace to major elements by graphite furnace-atomic absorption spectroscopy. All the medicinal herbs studied were found to contain the ten elements analyzed. The elemental concentration is given in mg/kg. Mg and Ca are present in high concentrations in both the roots and leaves of the plant samples. Among trace transition metals Fe had the highest concentration, followed by Mn, Cr, Cu, V, Zn, and Mo. Analysis showed that the toxic Cd element was at a lower concentration and is within the permissible limit of FAO/WHO, California standards and United States Pharmacopeia Limit for Nutritional Supplements.

KCI등재 SCOPUS

6Isolation of bacteria capable of removing 2-methylisoborneol and effect of cometabolism carbon on biodegradation

저자 : Kang Du , Jian Liu , Beihai Zhou , Rongfang Yuan

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 256-264 (9 pages)

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2-Methylisoborneol (2-MIB) is one of typical odorants in potable water sources, which is hardly removed by conventional water treatment process. In this study, three strains capable of removing 2-MIB singly from drinking water were isolated from activated carbon of sand filter. They were identified to be Shinella zoogloeoides, Bacillus idriensis and Chitinophagaceae bacterium based on 16S rRNA gene sequence analysis. In mineral salts medium without external carbon source, removal efficiencies of 20 μg/L 2-MIB in three days were 23.3%, 32.9% and 17.0% for Shinella zoogloeoides, Bacillus idriensis and Chitinophagaceae bacterium, respectively. The biodegradation of 2-MIB was significantly improved with the presence of cometabolism carbon(glycerol, glucose, etc.). In the period of 20 days, Bacillus idriensis can remove 2 mg/L MIB to 368.2 μg/L and 315.4 μg/L in mineral salts medium without and with glycerol respectively. The removal of 2-MIB by Bacillus idriensis was from 2 mg/L to 958.4 μg/L in Xiba river samples on 15 days.

KCI등재 SCOPUS

7Anaerobic digestate as a nutrient medium for the growth of the green microalga Neochloris oleoabundans

저자 : Husam A. Abu Hajar , R. Guy Riefler , Ben J. Stuart

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 265-275 (11 pages)

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In this study, the microalga Neochloris oleoabundans was cultivated in a sustainable manner using diluted anaerobic digestate to produce biomass as a potential biofuel feedstock. Prior to microalgae cultivation, the anaerobic digestate was characterized and several pretreatment methods including hydrogen peroxide treatment, filtration, and supernatant extraction were investigated and their impact on the removal of suspended solids as well as other organic and inorganic matter was evaluated. It was found that the supernatant extraction was the most convenient pretreatment method and was used afterwards to prepare the nutrient media for microalgae cultivation. A bench-scale experiment was conducted using multiple dilutions of the supernatant and filtered anaerobic digestate in 16 mm round glass vials. The results indicated that the highest growth of the microalga N. oleoabundans was achieved with a total nitrogen concentration of 100 mg N/L in the 2.29% diluted supernatant in comparison to the filtered digestate and other dilutions.

KCI등재 SCOPUS

8Comparative assessment on the influences of effluents from conventional activated sludge and biological nutrient removal processes on algal bloom in receiving waters

저자 : Chul Park , Diane Sheppard , Dongke Yu , Sona Dolan , Heonseop Eom , Jane Brooks , Douglas Borgatti

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 276-283 (8 pages)

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The goal of this study was to evaluate the effect of effluents from conventional activated sludge (CAS) and biological nutrient removal (BNR) processes on algal bloom in receiving waters. We made multiple effluent sampling from one CAS and two BNR facilities, characterized their effluents, and conducted bioassay using river and ocean water. The bioassay results showed that CAS effluents brought similar productivity in both river and ocean water, while BNR effluents were more reactive and productive in ocean water. Unexpectedly, nitrogen-based biomass yields in ocean water were up to six times larger for BNR effluents than CAS effluent. These results indicated that nitrogen in BNR effluents, although its total concentration is lower than that of CAS effluent, is more reactive and productive in ocean water. The ocean water bioassay further revealed that effluents of BNR and CAS led to considerably different phytoplankton community, indicating that different characteristics of effluents could also result in different types of algal bloom in receiving waters. The present study suggests that effects of upgrading CAS to BNR processes on algal bloom in receiving waters, especially in estuary and ocean, should be further examined.

KCI등재 SCOPUS

9Evaluation of monthly environmental loads from municipal wastewater treatment plants operation using life cycle assessment

저자 : Wenhua Piao , Ye-jin Kim

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 284-290 (7 pages)

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Life cycle assessment (LCA) methodology can be used to assess impacts on the environment that might be generated during treatment of wastewater and sludge treatment. In this work, LCA methodology was suggested to evaluate monthly environmental impact of wastewater treatment plants (WWTPs). Two field scale WWTPs, A2/O process and conventional activated sludge process (CAS), were selected as target plants and the operational data were collected from those plants. As the function units, the unit volume of treated wastewater of 1 ㎥ and 1 kg T-N eq. removed were selected. The environmental effect of target WWTPs operation were assessed as impact categories such as global warming potential, eutrophication potential, and so on. From monthly profiles of each index, it was shown that the environmental impact of WWTPs has seasonal patterns influenced by the influent flow rate variation causing higher impacts in winter than summer. This is due to the fact that there were no significant increase in the electricity consumption and chemical usage during the summer while the treated volume of wastewater was increased.

KCI등재 SCOPUS

10Photocatalytic removal of NOx using TiO2-coated zeolite

저자 : Joseph Albert Mendoza , Dong Hoon Lee , Joo-hyon Kang

발행기관 : 대한환경공학회 간행물 : Environmental Engineering Research (EER) 21권 3호 발행 연도 : 2016 페이지 : pp. 291-296 (6 pages)

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Application of photocatalytic nanoparticles has been recently gaining an increased attention as air purifying material for sustainable urban development. The present work reports the photocatalytic removal of gaseous phase nitrogen oxides (NOx) using TiO2-coated zeolite to be applied as a filter media for the urban green infrastructure such as raingardens. The TiO2-coated zeolite was synthesized by simple wet chemistry method and tested in a continuous-flow photo-reactor for its removal efficiency of NOx under different conditions of the weight percentage of TiO2 coated on the zeolite, and gas retention time. The removal efficiency of NOx in general increased as the weight percentage of TiO2 coated on the zeolite increased up to 15-20%. Greater than 90% of NOx was removed at a retention time of one minute using the TiO2-coated zeolite (TiO2 weight percentage = 20%). Overall, TiO2-coated zeolite showed greater efficiency of NOx removal compared to TiO2 powder probably by providing additional reaction sites from the porous structure of zeolite. It was presumed that the degradation of NOx is attributed to both the physical adsorption and photocatalytic oxidation that could simultaneously occur at the catalyst surface.

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