• Title/Summary/Keyword: volatile organic hydrocarbons

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Implementation of Infinite Boundary Condition Considering Superposed Theory on SVE Remediation System (토양증기추출복원 시스템에서 중첩이론을 고려한 무한 경계조건 실행)

  • Park, Jeong-Jun
    • Journal of the Korean Geosynthetics Society
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    • v.6 no.3
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    • pp.9-16
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    • 2007
  • Soil vapor extraction (SVE) is an effective and cost efficient method of removing volatile organic compounds (VOCs) and petroleum hydrocarbons from unsaturated soils. Incorporating PVDs in an SVE system can extend the effectiveness of SVE to lower permeability soils by shortening the air flow-paths and ultimately expediting contaminant removal. With this approach, the real bounded system is replaced for the purposes of analysis by an imaginary system of infinite areal extent. The boundary conditions for the contaminant remediation model test include constant head and no flow condition. Due to these parallel boundaries conditions, image wells should be developed in order to maintain the condition of no flow across the impermeable boundary. It is also assumed that the flow is drawdown along the constant head boundary condition. The factors contributing to the difference between the theoretical and measured pressure heads were also analyzed. The flow factor increases as the flow rate is increased. The flow rate is the most important factor that affects the difference between the measured and theoretical pressure heads.

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Numerical Analysis of Soil Vapour Extraction Remediation System using Prefabricated Vertical Drain (토목섬유 연직배수재를 활용한 토양증기추출복원시스템의 수치해석)

  • Shin, Eun-Chul;Park, Jeong-Jun;Lee, Kyu-Woong
    • Journal of the Korean Geosynthetics Society
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    • v.7 no.4
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    • pp.1-8
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    • 2008
  • Soil vapor extraction (SVE) is an effective and cost efficient method of removing volatile organic compounds (VOCs) and petroleum hydrocarbons from unsaturated soils. However, soil vapor extraction becomes ineffective in soils with low gas permeability, for example soils with air permeabilities less than 1 Darcy. The aim of this study is to investigate numerically the performance of a prefabricated vertical drain (PVD) as a SVE well, and the pattern of the induced air flow. A validated numerical model for a single PVD extraction well is developed based on the result of a well-designed laboratory model test. The validity of the simple analytical approach to determine air permeability based on the results of model tests is also discussed.

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Management Changes of Hazardous Air Pollutants Sources and Its Proposed Improvement in Korea (유해대기오염물질 배출원 관리의 변천과 개선방향)

  • Kim, Jong-Ho;Lee, Jeong Joo
    • Journal of Korean Society for Atmospheric Environment
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    • v.29 no.5
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    • pp.536-544
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    • 2013
  • Even a small amount of hazardous air pollutants could have a harmful influence upon human beings, animals and plants. Hazardous air pollutants have the properties of toxicity, canceration and organism accumulation. They include heavy metals, volatile organic compounds, polycyclic aromatic hydrocarbons, dioxin, etc. The Clean Air Conservation Act has defined specific hazardous air pollutants and designated 35 pollutants, distinguishing them from common air pollutants for special control. This study investigates the history of the controls of specific hazardous air pollutants with reference to some relevant laws and regulations in Korea. It investigates the regulations at the permission stage, such as the restrictions on installation of emission facilities, the permission and reporting of installation of emission facilities, and the regulations at the operation stage, such as maintaining permissible emission levels, installation of measuring devices, dues for emission, self-measurement and securing environmental engineers. The current regulatory management is not so satisfactory in regards to the serious effects of specific hazardous air pollutants upon the human body. An advanced new concept, like the maximum available control technology in US, the facilities management standards, which will soon take effect, will be able to lessen the emissions of fugitive hazardous air pollutants. In addition, this study discusses some possible stricter controls on the emission facilities of specific hazardous air pollutants and proposes some measures to maintain and supplement the current systems.

Monitoring of Benzene, Toluene, Ethylbenzene and Xylene (BTEX) Residues in Arable Lands around Oil Reservoir (유류저장시설 인근 농경지 중 Benzene, Toluene, Ethylbenzene 및 Xylene (BTEX) 잔류량 모니터링)

  • Lim, Sung-Jin;Kim, Jin-Hyo;Choi, Geun-Hyoung;Cho, Nam-Jun;Hong, Jin-Hwan;Park, Byung-Jun
    • Korean Journal of Environmental Agriculture
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    • v.33 no.4
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    • pp.414-418
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    • 2014
  • BACKGROUND: Benzene, toluene, ethylbenzene and xylene (BTEX), which are volatile aromatic hydrocarbons and main constituents of gasoline, are neuro-carcinogenic organic pollutants in soil and groundwater. Korea Ministry of Environment has established the maximum permissible level of BTEX in arable soil to 1, 20, 50 and 15 mg/kg, respectively. METHODS AND RESULTS: To understand an arable soil contamination by BTEX, we collected 92 samples from the arable lands around oil reservoir, and analyzed the BTEX residue using a GC-MS with head-space sampler. A linear correlation between BTEX concentration and peak areas was detected with coefficient correlations in the range of 0.9807-0.9995. The method LOQ of BTEX was 0.002, 0.014, 0.084, and 0.038 mg/kg, respectively. Recoveries of 0.5 mg/kg BTEX were found to be 73.7-96.9%. The precision was reliable since RSD percentage (0.7-7.5%) was below 30, which was the normal percent value. Also, BTEX in all samples were detected under the LOQ. CONCLUSION: These results showed that the investigated arable soils around airport and oil reservoir in Korea were not contaminated by oils.

A Research and Application of Active Ingredients in Bokbunja (Rubus coresnus Miuuel) (복분자 유용 성분의 연구과 그 응용)

  • Kwon, K.H.;Cha, W.S.;Kim, D.C.;Shin, H.J.
    • KSBB Journal
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    • v.21 no.6 s.101
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    • pp.405-409
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    • 2006
  • Bokbunja (Rubus coreanus Miquel) is a wild berry belonging to Rosaceae genus of which application areas have been expanded due to many health effects. Bokbunja berry contains carbohydrates, protein, fats and dietary fibers as major components and various flavonoids such as tannins, volatile components including organic acids, alcohols and hydrocarbons as minor ones. Those active compounds attribute to the following health effects: increase in immune function and antioxidant activity, rise in hormone secretion, suppression of the growth of type B hepatitis virus, and control of weight gain. To utilize the above activities, many products have been developed by using Bokbunja berry extracts in the area of foods, liquors, and cosmetics. Recently, pure compounds have been isolated from the extracts for the development of medicines. In this mini review, the state-of-the-art of Bokbunja researches and applications including papers and patents is summarized.

Characterization of Forest Fire Emissions and Their Possible Toxicological Impacts on Human Health

  • Kibet, Joshua;Bosire, Josephate;Kinyanjui, Thomas;Lang'at, Moses;Rono, Nicholas
    • Journal of Forest and Environmental Science
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    • v.33 no.2
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    • pp.113-121
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    • 2017
  • In flight particulate matter particularly emissions generated by incomplete combustion processes has become a subject of global concern due to the health problems and environmental impacts associated with them. This has compelled most countries to set standards for coarse and fine particles due to their conspicuous impacts on environment and public health. This contribution therefore explores forest fire emissions and how its particulates affects air quality, damage to vegetation, water bodies and biological functions as architects for lung diseases and other degenerative illnesses such as oxidative stress and aging. Soot was collected from simulated forest fire using a clean glass surface and carefully transferred into amber vials for analysis. Volatile components of soot were collected over 10 mL dichloromethane and analyzed using a QTOF Premier-Water Corp Liquid Chromatography hyphenated to a mass selective detector (MSD), and Gas Chromatograph coupled to a mass spectrometer (GC-MS). To characterize the size and surface morphology of soot, a scanning electron microscope (SEM) was used. The characterization of molecular volatiles from simulated forest fire emissions revealed long chain compounds including octadec-9-enoic acid, octadec-6-enoic acid, cyclotetracosane, cyclotetradecane, and a few aromatic hydrocarbons (benzene and naphthalene). Special classes of organics (dibenzo-p-dioxin and 2H-benzopyran) were also detected as minor products. Dibenzo-p-dioxin for instance in chlorinated form is one of the deadliest environmental organic toxins. The average particulate size of emissions using SEM was found to be $11.51{\pm}4.91{\mu}m$. This study has shown that most of the emissions from simulated forest fire fall within $PM_{10}$ particulate size. The molecular by-products of forest fire and particulate emissions may be toxic to both human and natural ecosystems, and are possible precursors for various respiratory ailments and cancers. The burning of a forest by natural disasters or man-made fires results in the destruction of natural habitats and serious air pollution.

Performance Evaluation of Soil Vapor Extraction Using Prefabricated Vertical Drain System (연직배수시스템을 이용한 토양증기추출공법의 성능 평가)

  • Shin, Eun-Chul;Park, Jeong-Jun
    • Journal of Soil and Groundwater Environment
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    • v.12 no.5
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    • pp.9-18
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    • 2007
  • Soil vapor extraction (SVE) is an effective and cost efficient method of removing volatile organic compounds (VOCs) and petroleum hydrocarbons from unsaturated soils. However, soil vapor extraction becomes ineffective in soils with low gas permeability, for example soils with air permeabilities less than 1 Darcy. Incorporating PVDs in an SVE system can extend the effectiveness of SVE to lower permeability soils by shortening the air flow-paths and ultimately expediting contaminant removal. The objective of the research described herein was to effectively incorporate PVDs into a SVE remediation system. The test results show that the gas permeability was evaluated for four different equivalent diameters, increasing the equivalent diameter results in a decrease in the calculated gas permeability. It was found that the porosity for the dry condition was greater than that of the wet condition and will allow flow rate for the same vacuum flow, offering a low resistance to the air flow.

Scientific Basis of Environmental Health Contingency Planning for a Coastal Oil Spill (대규모 유류유출사고 대비 환경보건 대응계획 수립을 위한 기반연구)

  • Kim, Young-Min;Cheong, Hae-Kwan;Kim, Jong-Ho;Kim, Jong-Hun;Ko, Kum-Sook;Ha, Mi-Na
    • Journal of Preventive Medicine and Public Health
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    • v.42 no.2
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    • pp.73-81
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    • 2009
  • Objectives : This study presents a scientific basis for the establishment of an environmental health contingency plan for dealing with accidental coastal oil spills and suggests some strategies for use in an environmental health emergency. Methods : We reviewed the existing literature, and analyzed the various fundamental factors involved in response strategies for oil spill. Our analysis included data derived from Hebei Spirit oil spill and used air dispersion modeling. Results : Spill amounts of more than 1,000 kl can affect the health of residents along the coast, especially those who belong to vulnerable groups. Almost 30% of South Korean population lives in the vicinity of the coast. The area that is at the highest risk for a spill and that has the greatest number of people at risk is the stretch of coastline from Busan to Tongyeong. The most prevalent types of oil spilt in Korean waters have been crude oil and bunker-C oil, both of which have relatively high specific gravity and contain volatile organic compounds, polycyclic aromatic hydrocarbons, and metals. In the case of a spill of more than 1,000 kl, it may be necessary to evacuate vulnerable and sensitive groups. Conclusions : The government should establish environmental health planning that considers the spill amount, the types of oil, and the distance between the spot of the accident and the coast, and should assemble a response team that includes environmental health specialists to prepare for the future oil spill.

Hebei Spirit Oil Spill Exposure and Subjective Symptoms in Residents Participating in Clean-Up Activities

  • Cheong, Hae-Kwan;Ha, Mi-Na;Lee, Jong-Seong;Kwon, Ho-Jang;Ha, Eun-Hee;Hong, Yun-Chul;Choi, Ye-Yong;Jeong, Woo-Chul;Hur, Jong-Il;Lee, Seung-Min;Kim, Eun-Jung;Im, Ho-Sub
    • Environmental Analysis Health and Toxicology
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    • v.26
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    • pp.7.1-7.9
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    • 2011
  • Objectives: This study was conducted to examine the relationship between crude oil exposure and physical symptoms among residents participating in clean-up work associated with the Hebei Spirit oil spill, 2007 in Korea. Methods: A total of 288 residents responded to a questionnaire regarding subjective physical symptoms, sociodemographic characteristics and clean-up activities that occurred between two and eight weeks after the accident. Additionally, the urine of 154 of the respondents was analyzed for metabolites of volatile organic compounds (VOCs) and polycyclic aromatic hydrocarbons (PAHs) and heavy metals. To compare the urinary levels of exposure biomarkers, the urine of 39 inland residents who were not directly exposed to the oil spill were analyzed. Results: Residents exposed to oil remnants through clean-up work showed associations between physical symptoms and the exposure levels defined in various ways, including days of work, degree of skin contamination, and levels of some urinary exposure biomarkers of VOCs, metabolites and metals, although no major abnormalities in urinary exposure biomarkers were observed. Conclusions: This study provides evidence of a relationship between crude oil exposure and acute human health effects and suggests the need for follow-up to evaluate the exposure status and long-term health effects of clean-up participants.

Hazard Levels of Cooking Fumes in Republic of Korea Schools

  • Lee, Iu-Jin;Lee, Sang-Gil;Choi, Bo-Hwa;Seo, Hoe-Kyeong;Choi, Ji-Hyung
    • Safety and Health at Work
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    • v.13 no.2
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    • pp.227-234
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    • 2022
  • Background and Purpose: In 2021, lung cancer in school food workers was first recognized as an occupational cancer. The classification of the carcinogenicity of cooking fumes by International Agency for Research on Cancer (IARC) was based on Chinese epidemiological data. This study aimed to determine the hazard levels of school cooking fumes in Korea. Materials and Methods: Based on public school cafeterias in one area, 25 locations were selected for the survey according to the number per school type, ventilation states, and environmental pre-assessments of cafeterias. Two inside cooking areas using a heat source and one outside cooking area were selected as control measurement points. Measurements of CO, CO2, polycyclic aromatic hydrocarbons (PAHs), and total volatile organic compounds (TVOCs), including benzene, formaldehyde, and particulate matter (PM10, PM2.5, PM1, respectively), were taken. The concentrations and patterns of each substance in the kitchens were compared with the outdoor air quality. Result: Known carcinogens, such as the concentrations of PAHs, formaldehyde, TVOC (benzene), and particulate matter in school cooking fumes, were all detected at similar or slightly higher levels than those found outside. Additionally, substances were detected at relatively low concentrations compared to the Chinese cooking fumes reported in the literature. However, the short-term exposure to high concentrations of CO (or composite exposure with CO2) and PM2.5 in this study were shown. Conclusion: The school cooking fumes in South Korea was a relatively less harmful than Chinese cooking fumes, however short-term, high exposure of toxic substances can cause a critical health effect.