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- 저자 : Parkpian, P. (검색결과 2 건)
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A Comparative Study on the Influence of Effluent Recycles to Duckweed-based Ponds Performance
이승환(S. H. Lee),L. Benjawan,T. Koottatep,C. Polprasert,P. Parkpian 대한환경공학회 2005 대한환경공학회 학술발표논문집 Vol.2005 No.12
Pilot-scale continuous flow duckweed-based ponds (DWBPs) were selected in this study as a dominant natural treatment system in respect to nitrogen removal, recovery and reuse suitable for developing countries. The study aimed to enhance system efficiencies especially on N removal and also to increase system stability, thus effluent recycles was introduced. A pilot-scale DWBPs was fed continuously with domestic wastewater, which had TN loading of approximately 10-60 kg ha(-1)d(-1) and COD loading of 19-120 kg ha(-1)d(-1). Six different treatment conditions were set by varying hydraulic retention time at 8 and 16 days, and each of that had effluent recycle rate (Influent : Effluent) at 1:0, 1:0.5 and 1:1 respectively. After comparing these operations, higher N removal efficiencies were significantly different in the system which had longer retention time and effluent recycles. The optimum operating condition was HRT 16 days with effluent recycles 1:1, in which the mean removals were 54% for TN, 72% for TKN and 73% for NH₄-N. It was found that the removal efficiencies of all N species had no obvious differences with effluent recycles, although they were differences in duckweed growth and system stability.
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Kim Oanh, N.T.,Kongpran, J.,Hang, N.T.,Parkpian, P.,Hung, N.T.Q.,Lee, S.B.,Bae, G.N. Pergamon Press ; Elsevier [distribution] 2013 Atmospheric environment Vol.77 No.-
Traffic is a major source of air pollution in urban areas of developing countries that leads to high exposure risk of urban dwellers. This study comparatively investigated levels of fine particles (PM<SUB>2.5</SUB>), SO<SUB>2</SUB>, NO<SUB>2</SUB>, and BTEX (benzene, toluene, ethylbenzene and xylenes) at fixed roadsides and on traveling routes in congested urban and less congested suburban areas of Bangkok in 2010. The roadside air quality monitoring was done at two opposite sites across the selected roads. The traffic counting was made simultaneously in these roads and hourly flows of 8 different vehicle types were determined. Roadside PM<SUB>2.5</SUB> levels during dry season were high in both the city center and suburban area, significantly above the wet season, with 65-75% measurements exceeded 24 h Thailand ambient air quality standard of 50 μg m<SUP>-3</SUP>. Oppositely, roadside BTEX levels measured in the city center during wet season were higher than dry season and well above those in suburban area. Diurnal variations and the results of SPSS (Statistical Package for the Social Sciences) analysis showed associations between roadside pollutants levels and hourly traffic flows. The differences in pollution levels between 2 monitoring sites across a road were explained by road configurations and prevalent wind directions. On-route pollution levels were measured simultaneously both inside and outside selected vehicles (van, pickup), and on motorcycle. The on-route PM<SUB>2.5</SUB> levels along the urban route were higher during the dry season than wet season. PM<SUB>2.5</SUB> levels inside the vehicles were lower than outside whereas the opposite was observed for BTEX. BTEX were higher on more congested urban sub-routes with lower vehicle speeds. Higher pollution levels suggest a high risk of exposure.
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