• Title/Summary/Keyword: VOC system

Search Result 234, Processing Time 0.036 seconds

The Detection of VOCs in Effluents from Several Wastewater Treatment Plants and Industry Drains in Nakdong River Basin (낙동강 유역 일부 폐수처리장 방류수 및 공단배수로의 휘발성유기화합물(VOCs)의 분포현황)

  • Bae, Hun-Kyun
    • Journal of Korean Society of Environmental Engineers
    • /
    • v.34 no.4
    • /
    • pp.254-259
    • /
    • 2012
  • The discharge characteristics of Volatile Organic Compounds (VOCs) from seven wastewater treatment plants and two industry drains at Nakdong River basin were investigated. Four Sampling campaigns were conducted between May 2008 and November 2008, and tested for 17 VOCs. As results, eight VOCs were detected at some sampling sites, but their concentration levels were low; 0.19~3.41 ${\mu}g/L$, dependent on each sampling location and substance. However, proper management plans such as supervising and monitoring systems for VOCs are needed to control those pollutants since VOCs might affect human health as well as aquatic ecosystems with extremely low concentration levels.

A Study on the Comparison of Biogenic VOC (BVOC) Emissions Estimates by BEIS and CORINAIR Methodologies (BEIS와 CORINAIR 산출방법에 의한 자연식생 VOC 배출량 산출 비교 연구)

  • Cho Kyu-Tak;Kim Jo-Chun;Hong Ji-Hyung
    • Journal of Korean Society for Atmospheric Environment
    • /
    • v.22 no.2
    • /
    • pp.167-177
    • /
    • 2006
  • In this study, a fundamental work for developing a biogenic Volatile Organic Compounds(BVOC) emission model in Korea has been carried out. Two different approaches, Biogenic Emission Inventory System(BEIS2) and CORINAIR Methodology(CORINAIR) were compared for estimating BVOC emissions. It was found that BEIS and CORINAIR showed very similar results each other BVOC emissions estimated by two different methods were about the same on a national and regional(provincial) scale. In case of monthly emissions the difference between BEIS and CORINAIR were larger than those on a national and regional(provincial) scale, especially in summer season(June, July and August). Although BEIS and CORINAIR are quite different techniques to correct the environmental conditions, they revealed similar results. Therefore, it is proven that both the methods are able to be applied to the estimation of the BVOC emissions in Korea.

Isolation of formaldehyde-responsive proteins in Arabidopsis (Formaldehyde에 반응하는 애기장대 단백질의 분리)

  • Kwon, Mi;Park, Hyun Jin;Seo, Jae Hyun
    • Journal of the Korean Wood Science and Technology
    • /
    • v.35 no.4
    • /
    • pp.52-60
    • /
    • 2007
  • Plant can detoxify the effect of the volatile organic compounds (VOC) such as formaldehyde and toluene, however, mechanisms of VOC detoxification are largely unknown in plant system. This study was performed to investigate phenotypic changes of Arabidopsis seedlings upon treatment of either formalin or toluene. Formalin treatment up to twenty four hours didn't cause any significant phenotypic damages on the leaf surface of 27 DAG Arabidopsis seedlings. However, the protein profile of formalin-treated seedlings was significantly different from that of mock control. Using automated electrophoresis system, the molecular weight of each formaldehyde-responsive protein (FRP) was predicted and its formaldehyde-dependent expression was confirmed at transcription level by quantitative real-time RT-PCR analysis. Four FRPs isolated in this study are the novel proteins with unknown functions but highly homologous to the stress-related proteins.

A study on Measurement and Improvement of Indoor Air Quality in Dental Clinic

  • Choi, Mi-Suk;Ji, Dong-Ha
    • Journal of the Korea Society of Computer and Information
    • /
    • v.23 no.11
    • /
    • pp.143-149
    • /
    • 2018
  • The purpose of this study is to propose a management method to maintain the pleasant indoor air quality of the dental clinic by measuring and analyzing the indoor air quality of the dental clinic. The measurement was conducted in two rooms, a lobby where many residents stay in the reception room for waiting for medical treatment, and a VIP room where treatment activities are mainly performed. Measurement items are Temperature, Humidity, $CO_2$, CO, $NO_2$, $CH_2O$, VOC, $PM_{10}$ and measurement were taken on April 27, 2018. As a result of analyzing the temperature and humidity of the dental clinic, it was analyzed that the average indoor temperature was maintained at $25^{\circ}C$ and the humidity was kept at around 50%, maintaining proper indoor temperature and humidity environment. $CO_2$ was 855ppm in the VIP Room, which satisfied the maintenance standard. In the case of the lobby, it was analyzed to be 1,160ppm, which exceeded the maintenance standard and it is judged that the carbon dioxide generated by the respiration of the people staying in the lobby is the main reason. The mean concentration of formaldehyde in the VIP room was analyzed as $436{\mu}g/m^3$, exceeding the maintenance standard, and $2,100{\mu}g/m^3$ for the VOC exceeded the recommended standard. It was analyzed that the concentration was relatively higher due to the use of disinfectant and other drugs. The mean concentration of PM-10 in the lobby was analyzed as $65{\mu}g/m^3$ and it was analyzed that it satisfied the maintenance standard. To maintain a pleasant indoor air quality in a dental clinic it is necessary to minimize the effects of formaldehyde, VOC, $CO_2$ in the VIP rooms and lobby. For this purpose, the entire ventilation system and air purification system of the dental clinic should be installed. In case of the VIP room, local exhaust ventilation should be installed and workers should wear personal protective equipment.

Indoor Air Data Meter and Monitoring System (실내 공기 데이터 측정기 및 모니터링 시스템)

  • Jeon, Sungwoo;Lim, Hyunkeun;Park, Soonmo;Jung, Hoekyung
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.26 no.1
    • /
    • pp.140-145
    • /
    • 2022
  • In an advanced modern society, among air pollutants caused by urban industrialization and public transportation, fine dust flows into indoors from the outdoors. The fine dust meter used indoors provides limited information and measures the pollution level differently, so there is a problem that users cannot monitor and monitor the data they want. To solve this problem, in this paper, indoor air quality data fine dust and ultra-fine dust (PM1.0, PM2.5, PM10), VOC (Volatile Organic Compounds) and PIR (Passive Infrared Sensor) are used to measure fine dust. and a monitoring system were designed and implemented. We propose a fine dust meter and monitoring system that is installed in a designated area to measure fine dust in real time, collects, stores, and visualizes data through App Engine of Google Cloud Platform and provides it to users.

A Study on Behavior Characteristics of Volatile Organic Compound Caused by Ventilation in a Room (통풍에 의한 휘발성 유기화합물의 실내 거동 특성에 대한 연구)

  • Kim, Jang-Woo;Chung, Jin-Do
    • Journal of Environmental Science International
    • /
    • v.15 no.11
    • /
    • pp.1011-1016
    • /
    • 2006
  • Recently, volatile organic compound(VOC) has been noted as a main cause of air pollution. VOC, with its toxic and offensive odor, is hazardous to health. Furthermore indoor, underground and hish-rise buildings are preferable living spaces. People spend more than 80% of the day indoor, so indoor air pollution is a matter of importance. In Korea, from 2004, 10 types of indoor pollutants in public facilities have been identified. However, there is no standard for individual VOC, so the regulation has not yet effectively been carried out. In this study, we have studied on the diffusion of Benzene in a room using a numerical analysis for various air-controlled conditions consisted of door, window and ventilation system. This study investigates spatial concentration distribution and time-history of room-averaged benzene concentration for several cases. The results of this study show that when the room is ventilated by a small fan only for 30 minutes, the average concentration of benzene is decreased a very little, thus the impact to human body would be serious compared to the case of natural ventilation by window and door, In the case of natural ventilation by window and door, if the wind speed is higher than 0.5m/s, it takes small than 4 minutes for benzene to spread to the target concentration of $1.2mg/m^3$.

Prediction of Gas Phase Sorption Isotherms on The Basis of QSAR Method (QSAR 방법을 이용한 가스 상태의 등온흡착선 예측)

  • Kim, Jong O
    • KSCE Journal of Civil and Environmental Engineering Research
    • /
    • v.11 no.3
    • /
    • pp.11-18
    • /
    • 1991
  • Volatile organic compounds(VOC) present in or generated by many sources, can be toxic, mutagenic or even carcinogenic, so that control of such emissions is significant. The 6 chlorinated organic chemicals as VOC were examined in this study. Prediction of the behavior of VOC on activated carbon beds is an important part of control system design. The objective of this study was to predict gas phase sorption isotherms from physical properties and liquid phase isotherms obtained with the same adsorbent and adsorbate. One of the techniques that was investigated was quantitative structure-activity relationships(QSAR) for the predicition procedures. It was possible to estimate sorption isotherms in the gas phase($a_g$) using either connectivity index, $^2{\chi}$, and the Henry's law coefficient ($H_a$) or the solubility and the equilibrium concentration in the gas phase. As a result of study, the predictive equation based on Freundlich model for $a_g$ was ${\log}\;a_g=0.238\;^2{\chi}+0.573\;{\log}\;H_a+4.330(r^2=0.94)$. Finally, this would provide a potentially useful tool to describe and predict sorption capacity without time-consuming tests.

  • PDF

Characteristics of Ozone Precursor Emissions and POCP in the Biggest Port City in Korea

  • Song, Sang-Keun;Shon, Zang-Ho;Son, Hyun Keun
    • Asian Journal of Atmospheric Environment
    • /
    • v.9 no.2
    • /
    • pp.146-157
    • /
    • 2015
  • Emissions of ozone precursors ($NO_x$ and VOCs) and photochemical ozone creation potentials (POCPs) of VOC emission sources were investigated in the largest port city (i.e., Busan), Korea during the year 2011. This analysis was performed using the Clean Air Policy Support System (CAPSS) national emission inventory provided by the National Institute of Environmental Research (NIER), Korea. For $NO_x$, the emissions from off-road mobile sources in Busan were the most dominant (e.g., $31,202ton\;yr^{-1}$), accounting for about 60% of the total $NO_x$ emissions. The emission from shipping of off-road mobile sources (e.g., $24,922ton\;yr^{-1}$) was a major contributor to their total emissions, amounting to 47% of the total $NO_x$ emissions due to the port-related activities in Busan. For VOCs, the emission source category of solvent usage was predominant (e.g., $36,062ton\;yr^{-1}$), accounting for approximately 82% of the total VOC emissions. Out of solvent usages, the emission from painting was the most dominant ($22,733ton\;yr^{-1}$), comprising 52% of the total emissions from solvent usages. The most dominant VOC species emitted from their sources in Busan was toluene, followed by xylene, butane, ethylbenzene, n-butanol, isopropyl alcohol, and propane. The major emission sources of toluene and xylene were found to be painting of coil coating and ship building, respectively. The value of POCP for the off-road mobile source (61) was the highest in ten major activity sectors of VOC emissions. Since the POCP value of ship transport of off-road mobile source (72) was also high enough to affect ozone concentration, the ship emission can play a significant role in ozone production of the port city like Busan.

The Development of VOC Measurement System Uging PCA & ANN (PCA와 ANN을 이용한 VOC 측정기기 개발)

  • Lee Jang-Hoon;Kwon Hyuk-Ku;Park Seung Ho;Kim Dong-Jin;Hong Chol-Ho
    • Environmental Analysis Health and Toxicology
    • /
    • v.19 no.2
    • /
    • pp.161-167
    • /
    • 2004
  • Air quality monitoring is a primary activity for industrial and social environment. The government identifies the pollutants that each industry must monitor. Especially, the VOCs (Volatile Organic Compounds), which are very harmful to human body and environment atmosphere, should be controlled under the government policy. However, the VOCs, which have not been confirmed in emission sources are very difficult to monitor. It is needed to develop the monitoring system that allow the continuous and in situ measurement of VOCs mixture in different environmental matrices. Gas chromatography and mass spectrometry are the most prevalent current techniques among those available for the analysis of VOCs. But, they need a large size analytical instrument, which costs a great deal for purchase and operation. In addition, it has some limitations for realtime environmental monitoring such as location problems and slow processing time. Recently, several companies have commercialized a portable VOCs measurement systems, which cannot classify various kinds of VOCs but total quantities. We have developed a VOCs measurement system, which recognizes various kinds and quantities of VOCs, such as benzene, toluene, and xylene (BTX). Also, it can be used as a stand- alone type and/or fixed type in the vehicle with rack for real -time environmental monitoring.