• Title/Summary/Keyword: Site environmental characteristics

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Operational Characteristics and application of reactor using entrapped microorganism in the sewage treatment (고정화 미생물 반응조의 운전특성 및 생활하수처리 적용)

  • 차수길;이병헌;정승현
    • Proceedings of the Korean Environmental Health Society Conference
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    • 2002.04a
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    • pp.26.1-28
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    • 2002
  • Entrapped media with cellulous triacetate in which actived sludge was applied to induce operation factors and sewage treatment on site. The results are summarized as follows; The treatment efficiency of entrapped media is 92%, 90% and 80% at the size of 5mm, 7mm, and 12mm, respectively. Also, treatment efficient rate was increased by the packed amount of media in less than 30% packed, while in more than 40% packed that was decreased. It takes 10day to reach the steady states and it is less than the existing activated sludge method. The slopes of oxygen consumption rate are almost parallel both in the entrapped media and free sludge. When organic loading rate is less than 1.0 kg/㎥. d on site, it is achieved good removal rate independent of changes of loading rate.

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Concentration of Volatile Organic Compounds at Main Stream and Branch Stream of Kumho River (금호강 본류와 지류에서의 휘발성 유기화합물질 농도)

  • 김용혜;장봉기;홍성철;이종영
    • Journal of environmental and Sanitary engineering
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    • v.13 no.1
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    • pp.135-146
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    • 1998
  • In this study, we investigated to measured concentration, seasonal characteristics and load quantity of volatile organic compounds(VOCs) for 11 sites in the main stream and 8 sites in the branch stream of Kumho river, during from October 1995 to April 1997. As a results, the small amount of volatile compounds, such as dichloromethane, chloroform, toluene, benzene, trichloroethene, tetrachloroethene, p-xylene and 1,3,5-trimethyl-benzene were detected from the main stream of Kumho river. Also detected to dichloromethene, chloroform, toluene, benzene, trichloroethene, tetrachloroethene, ethylbenzene, p-xylene, 1,3,5-trimethylbebzene and 1,2,4-trimethylbenzene in the branch stream, and dichloromerhane, chloroform and toluene were detected to all site of sampling. And seasonal variation of volatile organic compounds showed higher concentration in the July 1996 as a winter season than January 1997 as a summer season in most places. Also the load quantity of volatile organic compound at Gangchang site in the last downstream of Kumho river, was in order of chloroform > dichloromethane > toluene > trichloroethene.

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Analysis and Assessment of Environmental Factors in the Small Scale Marine Ranch around the Gunsan Coastal Areas (소규모 바다목장의 해양 환경 분석 및 평가 - 군산주변해역)

  • Kim, Jong-Hwa
    • Journal of Fisheries and Marine Sciences Education
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    • v.20 no.3
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    • pp.487-499
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    • 2008
  • This study was analyzed and assessed the environmental factors on small marine ranching sites around Gunsan Coast, West Sea of Korea. Standards of assessment are followed in the reports on the choice of marine ranching sites and regulation factors of proper site on marine artificial reefs of MOMAF. Max. current speed around Gunsan were ranged between 25.52 ~ 57.49cm/sec. These values were satisfied by comparing assessment factor such as current speed.. Factors of temperature, salinity, transparency and pH were evaluated as the proper extent. DO was not distributed as the proper extent due to different criterion. between the same assessment factor. COD, SS and nutrients were partly suited to the criteria. Especially, SS was almost higher than that of criterion. So, we are proposed to be reflected in environment characteristics of West Coast such as SS. Moreover, the extent of pollution load factors have to be specified clearly in the regulations of assessment criteria.

Operational characteristics and application of reactor using entrapped microorganism in the sewage treatment (고정화 미생물 반응조의 운전특성 및 생활하수처리 적용)

  • Cha Su Gil;Lee Byung Hun;Jeong Seung Hyun
    • Journal of Environmental Health Sciences
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    • v.28 no.1
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    • pp.79-84
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    • 2002
  • Entrapped media with cellulous triacetate in which activated sludge was applied to induce operating factors and sewage treatment on site. The results are summarized as follows; The treatment efficiency of entrapped media is 92%, 90% and 80% at the size of 5mm, 7mm, and 12mm, respectively. Also, treatment efficient rate was increased by the packed amount of media in less than 30 % packed, while in more than 40 % packed that was decreased. It takes 10 day to reach the steady states and it is less than the existing activated sludge method. The slopes of oxygen consumption rate are almost parallel both in the entrapped media and free sludge. When organic loading rate is less than 1.0 kg/m$^3$ㆍd on site, it is achieved good removal rate independent of changes of loading rate.

A Study on the Development of Battery Energy Storage System (전지이용 전력저장장치 기술개발)

  • Hwang, Yong-Ha;Lee, Keun-Seob
    • Proceedings of the KIEE Conference
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    • 1993.07b
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    • pp.905-907
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    • 1993
  • Demand for electricity is increasing annually. Especially, the daytime demand grawth shows higher than any other time period. So the big difference between maximum and minimum electrical demand becomes another important problem to be solved. The Battery Energy Storage System is chosen as one of the solutions among the sevral methods. The purpose of utilization of Battery Energy Storage System is to improve the daily load factor. Also, Battery Energy Storage System may be used for the load levelling or the load shifting as well as the spinning reserve. Up to now, only the pumped hydro power plant system has been operated on the commercial basis, but this system has so many constraints such as site, environmental effects, construction period, ect. Being considered current electrical power situation the development of electric storage system is in need latly. Among the various electric storage systems, Battery Energy System is chosen with the top priority because it has sevral merits to cover such as the short construction period, the demand site installation, and the food environmental characteristics.

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A Study on the Changes of Plant Species and Soil Environmental Characteristics on Green Roofs at Seoul Women's University (서울여자대학교 옥상녹화 지역의 식물 종 증감 및 토양환경 특성 변화)

  • Lee, Sang-Jin;Park, Gwan-Soo;Lee, Dong-Kun;Lee, Eun-Heui;Jang, Seong-Wan;Kim, Myeoung-Hee;Kil, Sung-Ho;Lee, Hang-Goo;Jang, Kwan-Woo;Park, Beom-Hwan;Yoon, Jun-Young;Kwon, Oh-Jung
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.16 no.6
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    • pp.109-117
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    • 2013
  • This study was carried out to investigate the changes of plant species and soil physicochemical properties on green roofs established at Seoul Women's University in 2005, 2006 and 2007. The plant species and soil properties were investigated in 2013. The areas of green roof sites ranged $90{\sim}100m^2$. There were floras of vascular plants of 12 families, 20 genera and 22 species in the 2005 site, 24 families, 37 genera and 38 species in the 2006 site, 14 families, 27 genera and 31 species in the 2007 site. The total number of plant species decreased in the 2005 and 2006 sites and increased in the 2007 site since established. High proportion of dispersal type was barochory in the 2005 and 2006 site, and autochory in the 2007 site. And the proportion of the compositae family was high in the introduced plants over the sites for the all study sites. Average pH and organic matter concentration of green roof soil were ranged from 5.25 to 5.96 and 7.17 to 8.96% in study sites. The organic matter concentration and pH of green roof soil were lower in 2013 than in the three establishment years. Carbon concentration of green roof soil in the three study sites were ranged from 4.16 to 5.30% and total soil carbon in 10cm depth were ranged form 1.57 to $1.98kg/m^2$.

Analysis of the Characteristics and High Concentrations of Carbon Dioxide Measured at the Gosan Site in Jeju, Korea in 2007 (2007년 제주 고산의 이산화탄소 농도 현황 및 고농도 사례 분석)

  • Kim, Seung-Yeon;Lee, Jae-Bum;Yu, Jeong-Ah;Hong, Yu-Deog;Song, Chang-Geun
    • Journal of Climate Change Research
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    • v.2 no.1
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    • pp.1-14
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    • 2011
  • In order to identify the current state of the $CO_2$ concentrations at the Gosan site in Jeju, the data from the Gosan station was compared with the ones from domestic and foreign sites registered in the World Data Centre for Greenhouse Gases(WDCGG). As a result, the $CO_2$ concentrations in the Asian region including Gosan site were higher than in the other continents, which can be explained that the $CO_2$ emissions in the Asian region have been rapidly increasing due to the recent economic growth. In comparison with ther Asian-Pacific sites (i.e., Ryori, Waliguan, and Mauna Loa), Gosan site showed the highest $CO_2$ concentrations because this site can be easily affected by China emissions. With the trajectory analysis and the ratios of air pollutants, we found that the high concentrations of Gosan site in January were mainly caused by the long-range transport from China, while in August the high concentration in the night time by the stagnation and the active plant respiration. Also, in May and November it occurred as the polluted air from China was transported with migratory cyclone.

Ecological Risk Assessment based on Watershed System Assimilative Capacity in take Texoma, Texas-Oklahoma, USA (유역시스템 정화력을 고려한 생태위해성평가 사례연구: Lake Texoma Watershed (TX&OK, USA)를 대상으로)

  • An, Youn-Joo;Donald H. Kampbell;Guy W. Sewell
    • Proceedings of the Korea Society of Environmental Toocicology Conference
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    • 2003.10a
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    • pp.27-27
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    • 2003
  • Lake Texoma is located on the border of southern Oklahoma and northern Texas. It has 93,000 surface acres, and is a focus of the recreation, and farming industries in the region. There are potential stressors around the Lake Texoma watershed that may cause adverse ecological effects in the lake. System assimilative capacity (SAC) is the ability of abiotic and biotic processes to atteuniate the stressors. SAC Exceeded indicates potential of occuring adverse eco-effects. A number of representative chemical release sites and stressor sources in the surrounding watershed were characterized, and several impact sites having stressors sources, such as being near agriculture, landfills, housing areas, oil production fields and heavy use recreational activity, were selected for surface water, sediment, and groundwater monitoring. A paired reference site, having similar physical characteristics as its impact site, was also chosen based on its proximity to the impact site. Lake water samples were collected at locations identified as marina entrance, gasoline filling station, and boat dock at five marinas selected on Lake Texoma from September 1999 to December 2001. Paired water and sediment samples were also collected. Groundwater samples were collected at about 70 producing monitoring wells. Water quality parameters measured were inorganics (nitrate, nitrite, orthophosphate, ammonia, sulfate, and chloride), dissolved methane, total organic carbon (TOC) (or DOC), volatile organic compounds (VOCs) such as methyl tert-butyl ether (MTBE) and BTEX, and a suite of metals. Biotic communities were evaluated at impact and reference sites. Five basic components were measured; two terrestirial components (plants and bird comminitires) and three aquatic components (benthic inverbrates, litteral-zone fishes, ecosystem attribures). Potential impacts to these comminites were evaluated.

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A study of Habitat Use Pattern of River Otters (Lutra lutra) with Land-cover Map (토지피복도를 활용한 수달의 서식지 이용에 관한 연구)

  • Lee, Sang-Don;Cho, Heesun
    • Journal of Environmental Impact Assessment
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    • v.14 no.6
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    • pp.377-385
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    • 2005
  • The Eurasian otter(Lutra lutra) is listed as No. 330 in natural monument. To manage and conserve habitat for otters, it is critical to understand which habitat components are important for otters. The objectives of this study were to analyze otter habitat characteristics in accordance with land-cover map. We investigated otter spraints and sprainting site in Geoje Island from January to December, 2004. with GPS coordinates. The analysis of otter habitat use pattern was used by Arcview ver. 3.2 with 1: 25,000 Topology Map and field data. Otter habitat use was strongly related to sites in riparian vegetation riparian(dam or river) structures. In this study, Gucheon was a site with high coverage of riparian vegetation and unconfined channels, thus recording higher number of spraint densities than those of Yeonchocheon. Yeonchocheon was under construction at lower stream areas so that otter habitat use was limited. This study suggests that securing suitable forests and riparian vegetation zone is essential for conservation of otters.

Characteristics of Vertical Variation of Wind Resources in Planetary Boundary Layer in Coastal Area using Tall Tower Observation (타워 관측 자료를 이용한 연안 대기 경계층 내 바람 자원의 연직 변동 특성)

  • Yoo, Jung-Woo;Lee, Hwa-Woon;Lee, Soon-Hwan;Kim, Dong-Hyeok
    • Journal of Korean Society for Atmospheric Environment
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    • v.28 no.6
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    • pp.632-643
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    • 2012
  • Analysis of wind resources in Planetary Boundary Layer (PBL) using long term observation of tall tower located near coast line of the Korean Peninsula were carried out. The data observed at Pohang, Gunsan and Jinhae are wind, temperature and relative humidity with 10 minute interval for one year from 1 October 2010. Vertical turbulence intensity and its deviation at Pohang site is smaller than those of other sites, and momentum flux estimated at 6 vertical layers tend to show small difference in Pohang site in comparison with other sites. The change of friction velocity with atmospheric stability in Pohang is also not so great. These analysis indicate the mechanical forcing due to geographical element of upwind side is more predominant than thermal forcing. On the other hand, wind resources at Gunsan and Jinhae are mainly controlled by thermal forcing.