• Journal of Korean Society of Environmental Engineers
• /
• v.27 no.3
• /
• pp.316-322
• /
• 2005

In this study, the concentration of 17 dioxin congeners in the soil samples near a waste incinerator with respect to distance from incinerator and wind directions were investigated. The effect of PCB source was investigated using the cluster analysis method. The total concentration and I-TEQ concentration of dioxin ranged from 31.065 to 7,257.499 pg/g(dry weight) and from 0.099 to 35.191 pg I-TEQ/g(dry weight.), respectively. There was a weak correlation(not statistically significant) observed between soil concentration and wind direction, and the distance from the incinerator. The reason may be due to the presence of the local combustion sources other than the target incinerator. The fraction of PCDFs and PCDDs was also examined to study the effect of incinerator. The fraction of PCDFs was decreased with the distance from the incinerator. The influence of target incinerator was found within a 500-meter radius. The high concentration in the for site was due to small incinerators and the use of agricultural chemicals such as PCP. To investigate the relationship between soil near the incinerator and the sources, the cluster analysis was conducted using the congener pattern. As a result soil samples were divided into four groups and were qualitatively estimated the influence of sources such as incinerator and PCP by comparing the congener pattern of each roups. It was thought that a cluster analysis was a useful statistical method for the source estimation of dioxin.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2003.05b
• /
• pp.53-54
• /
• 2003

현대 산업사회가 다양해짐에 따라 발생되는 생활폐기물의 형태도 다양화되었고 발생폐기물의 성상은 연소가 어려운 난분해성 폐기물로 발열량이 높아지고 있다. 이러한 폐기물의 처리를 위한 소각설비는 폐기물 처리형태에 따라 대형의 도시 쓰레기 소각장이나 지자체의 중형급 소각장, 발생원 단위의 소형 소각장으로 구분하여 처리하고있다. 기존 중ㆍ대형 소각로의 유해가스 처리시설은 일반적으로 냉각설비와 가스상 처리설비, 입자상 처리설비 등으로 구성되는데 반해, 소형 소각로는 싸이클론 방식만으로 구성되어 입자상 물질만을 처리하였으나, 최근에 들어서 관련법규가 개정되어 소형 소각로에서도 입자상 오염물질뿐만 아니라 HCl 및 SOx 등과 같은 산성가스류와 다이옥신 등의 배출농도를 규제함에 따라 가스상 오염물질도 처리하는 방안을 도입하고 있는 추세이다. (중략)

• Journal of the Korean Institute of Gas
• /
• v.7 no.2 s.19
• /
• pp.7-13
• /
• 2003

Abstract This paper presents new emission mechanism and emission estimation model in volatile organic compounds(VOCs) emission sources. Also classifies applicable emission reduction techniques and presents new economical evaluation method for each techniques. We ultimately developed VEER(VOCs Emission Estimation and Reduction) software, which is backed by above mentioned model, emission source DB, Chemical properties DB, meteorological DB, and emission factor DB. With VEER, users in enterprise, central government and local self-governing body can get reliable emission results easily, and choose suitable emission reduction techniques.

• 한국신재생에너지학회:학술대회논문집
• /
• 2007.06a
• /
• pp.594-597
• /
• 2007

바이오매스를 이용한 분산형 발전 및 에너지화의 경우 기존의 연소법은 단순 열에너지의 이용과 스팀터빈을 이용하는 대규모 시설이 요구된다. 반면 가스화의 경우 가연성 합성가스 생성을 통하여 소규모 분산형 발전이 가능하며, 생성가스를 이용하여 다양한 응용이 가능하다. 기존 상향류식 가스화의 경우의 바이오매스 가스화시 목질계 내 리그닌 성분으로 인하여 다량의 타르가 발생하여 후단 처리 설비에 어려움이 있다. 본 연구에서는 하향류식 가스화 방법을 통하여 목질계 바이오매스의 가스화 특성을 알아보았다. 가스화기 하부로 배출되는 합성가스의 온도는 대략 1000$^{\cdot}C$까지 유지할 수 있었으며, 생성되는 합성가스의 발열량은 약 $1300kcal/Nm^3$의 수준으로 얻을 수 있었다. 또한 발생되는 타르는 $5{\sim}15ppm$ 정도로 기존 상향류식에 비해 매우 적은양의 타르가 발생함을 확인할 수 있었다.

• Journal of Environmental Impact Assessment
• /
• v.28 no.5
• /
• pp.483-491
• /
• 2019

In orderto cope with the post-2020 in accordance with the Paris Agreement, greenhouse gas (GHG)reduction in Environmental Impact Assessment (EIA) and its contributions to post-2020 were discussed. The 26 Environmental Impact Statement (EIS) administered by Geum-River Basin Environmental Office from 2010 to 2019 were analyzed for reviewing GHG mitigation measures. From the case study, it was found that the assessment of GHG emissions reduction and climate change adaptation were not appropriately performed. In this study, the following measures are proposed to improve the inappropriate assessment of 'GHG subject matter' associated with EIA according to post-2020, 1) allotment of enforced charge on GHG emission during the EIA process, 2) addition of the 'GHG subject matter' in 'establishing permissible discharge standards' which is based on "Act on the Integrated Control of Pollutant-discharging Facilities", and 3) the participation of stakeholders in early EIA stage for governance. Also the details on the EIA for the preparedness of post-2020 were discussed here.

• Proceedings of the Korea Air Pollution Research Association Conference
• /
• 2000.11a
• /
• pp.352-353
• /
• 2000

악취물질은 산업의 발전과 경제성장에 따른 생활수준의 향상으로 인하여 급격히 늘어나는 대기오염 물질 중의 하나로, 악취문제는 인간의 오감을 통해서 느끼는 감각공해의 대표적인 물질이다. 악취물질의 대표적인 성분인 암모니아는 무색의 자극성이 매우 크고 부식성이 있는 알칼리 기체로 1 ppm 정도에서 감지되어 다른 악취물질보다 감지되는 농도가 높다. 또한 그 배출원이 화학공장 등의 산업시설 뿐만 아니라 양돈, 양계장 등에서도 배출되어 우리 주위에서 쉽게 감지할 수 있는 물질이다. (중략)

• Journal of the Korea Organic Resources Recycling Association
• /
• v.32 no.2
• /
• pp.37-48
• /
• 2024

Wastewater treatment plants (WWTPs) are obligated to reduce carbon emissions as a part of public sector greenhouse gas (GHG) emission reduction targets. However, Sewage Statistics(2022) shows that CO₂ emissions per wastewater treatment volumes have decreased by only 3.03 % compared to 2020, which is far from enough to meet the Nationally Determined Contribution (NDC) targets. This study aimed to find operational conditions of biological reactors that minimize total carbon footprint (CFP). Total CFP considers both direct emissions from biological processes and indirect emissions from energy consumption. A study was conducted using a computer simulation program which is called as EQPS for a 4-stage BNR WWTP. The results showed that total CFP was reduced by 10.97% compared to the design condition when the mixed liquor recirculation (MLR) was set to 100 % of the influent flow. The N₂O emission factor (EF) of the target WWTP was calculated to be 0.138-0.199 %, which is significantly lower than the IPCC default value of 1.6 %. This study proposes a method to minimize total CFP in WWTPs by optimizing biological reactor operation and emphasizes the need for further research on N₂O emission reduction.

• Journal of Korean Society of Environmental Engineers
• /
• v.37 no.2
• /
• pp.107-112
• /
• 2015

Carbon emissions in construction stage is very high because lots of construction machines and materials are required to be used at a road construction stage. Many researcher carried out application of carbon emissions estimation methodology during the life cycle of road infrastructure in order to reduce greenhouse gas emissions in the road sector. But the calculation of carbon emissions is difficult because data collection is difficult and calculation procedure is complex. In this study, a basic unit of carbon emissions in construction stage of the road infrastructure was developed in order to get the quantitative determination of carbon that occurs. Carbon emissions of the expressway and common state road was calculated by using the basic unit of carbon emissions and application plan of basic unit of carbon emissions are presented.

• Clean Technology
• /
• v.25 no.1
• /
• pp.40-45
• /
• 2019

In this study, nitrous oxide ($N_2O$) emission concentration was measured 3 times continuously for 24 hours from August 27, 2018 to October 22, 2018 and non-dispersive infrared (NDIR) spectrometer was used to calculate $N_2O$ concentration of exhaust gas from municipal solid waste (MSW) incinerator. As a result of $N_2O$ emission characteristics, it is estimated that $N_2O$ emission concentration is due to the difference of furnace temperature, oxygen concentration rather than the chemical component of waste. The measured $N_2O$ emission concentration of MSW incinerator was obtained in the range of 53.6 ~ 59.5 ppm and the total average concentration was measured 55.6 ppm. Therefore, the amount of $N_2O$ emissions calculated from the $N_2O$ concentration was $98.05kg\;day^{-1}$ on average and the amount of $N_2O$ distribution in the range of $90.41{\sim}108.44kg\;day^{-1}$ was obtained. As a result, the $N_2O$ emission factor of the MSW incinerator was estimated to be $1,066.13g_{N_2O}\;ton_{waste^{-1}}$. The estimated $N_2O$ emission factor of the MSW incinerator was 20 times higher than calculated emission factor used in the Tier 2 method. Consequently, it is considered that the method of calculating the amount of $N_2O$ emission in the MSW incineration facilities using waste type and incineration amount needs to be supplemented to ensure accuracy.

• Analytical Science and Technology
• /
• v.12 no.1
• /
• pp.61-67
• /
• 1999

Two of municipal waste incinerators were selected as surveying facilities to research on the emission of dioxin and precusors. The sampling of flue gas and analysis was performed in the selected facilities. From the result, the emission patterns of dioxin and precusors, their relatership were examined. The toxic equivalency quantity(TEQ) of dioxin concentration was evaluated in two municipal waste incinerators. The 76.24% and 60.84% of total dioxin concentration in A and B incinerator were made up of the penta-, hexa- and hepta-chlorinated dibenzo-p-dioxin, respectively. Therefore, to reduce the dioxins in flue gas have to control the formation of furans. The chlorobenzenes and chlorophenols were analyzed in two incinerators. The 1,2,4,5-tetrachlorobenzene, penta-, and hexachlorobenzene are discharged and 2,4,6-trichlorophenol, 2,3,4,6-tetrachlorophenol and pentachlorophenol are discharged mainly in A and B municipal waste incinerators.