• 한국조리학회지
• /
• 제22권8호
• /
• pp.149-156
• /
• 2016

본 연구의 목적은 조리과정에서 발생한 총휘발성 유기화합물질, 미세먼지, 악취, 총부유세균 등의 오염물질들이 조리실내로 분산되어 실내공간이나 조리업 종사자에게는 나쁜 냄새나 작업환경 및 건강피해를 감소하고자 하는 것이다. 이를 위해 기존 공기청정기의 단점을 보완하고, 반영구적이며, 각종 오염물질을 효율적으로 제거하기 위하여 활성탄과 황토를 결합한 바이오세라믹 필터를 bar type으로 제작한 실내용 소형 공기청정기 개발에 중점을 두었다. 측정항목은 총휘발성 유기화합물, 미세먼지, 복합악취, 총부유세균 등 모두 4가지 항목으로 개발된 공기청정기 가동 전과 일정시간 가동 후를 비교하여 측정하였다. 측정결과, 총휘발성 유기화합물의 농도는 평균 $2,500{\mu}g/m^3$에서 $223{\mu}g/m^3$으로 약 91.02%의 높은 제거효율을 보였으며, 미세먼지의 제거율은 평균 농도가 $26.68{\mu}g/m^3$로서 97.51%의 우수한 제거효과가 나타났으며, 복합악취의 희석배수를 측정한 결과 평균 144로 평균 95.20% 감소하였다. 또 총부유세균은 초기 농도가 $787{\sim}814CFU/m^3$에서 $47{\sim}40CFU/m^3$로 약 94% 이상 제거되는 것을 확인하였다. 결론적으로 개발되어진 공기청정기의 바이오세라믹 필터는 오염물질을 제거하는데 우수한 제거효과를 나타냈다. 따라서 공기청정기를 조리실내에서 환기장치와 렌지후드를 병행하여 사용하면 기존의 열악한 조리실 내의 환경이 크게 개선되어질 것으로 사료된다.

• 한국환경보건학회지
• /
• 제46권1호
• /
• pp.35-44
• /
• 2020

Objectives: The purpose of this study was to compare the health status of residents who were exposed to the Iksan industrial area in the living environment and those who were not exposed to such a source of industrial activity through a questionnaire survey designed to appraise the residents' health levels. Method: The authors conducted a health questionnaire survey of 1,012 residents around Iksan regarding their personal information, physician-diagnosed disease history, odors experienced, and more. Logistic regression was performed to identify the associations between hazardous chemical exposure and physician-diagnosed diseases. Result: Logistic regression shows significant differences in allergic rhinitis, cardiovascular disease, hypertension, dyslipidemia, liver disease, and osteoporosis. Odors were experienced by 88.0% of the survey group. The seasons were summer (71%) and spring (24.9%). Conclusion: For allergic rhinitis, cerebral cardiovascular disease, and hypertension, which were significantly higher in the case group than in the control group in the disease diagnosis and disease treatment history of physicians, it was difficult to completely eliminate the association with odor exposure in the Iksan Industrial Complex. It is considered that it has affected nearby residents. This study means that a correlation between chronic diseases has been found through regression analysis, and furthermore, this result can be used as a basis for sampling for secondary epidemiological surveys.

• 한국화재소방학회논문지
• /
• 제31권6호
• /
• pp.107-111
• /
• 2017

본 연구는 흡연시 발생되는 각종 유해오염물질을 효과적으로 저감할 수 있는 친환경 흡연부스를 제작하고, 유해물질의 제거효율 및 효과를 평가하는 것이다. 유입구-HEPA필터-전기집진기(EP)-첨착활성탄-배출구 등의 탈취설비를 갖춘 친환경 자동 흡연부스를 설계 및 제작하여, 흡연연기에 의한 유해오염물질의 제거효율을 측정 및 평가하였다. 측정방법으로는 내부의 배경농도, 설비 가동 시 배출구 농도, 10분 후 흡연부스의 농도를 측정하고, 평가항목으로는 복합악취, 일산화탄소, 미세먼지($PM_1$, $PM_{2.5}$, $PM_{10}$), 총휘발성유기화합물(TVOCs)을 대상으로 하였다. 복합악취 제거효율은 흡연부스 내부에서는 95.37%, 방지설비통과 배출구에서는 97.38%로 우수하였다. 일산화탄소 제거효율은 내부에서는 94.25%, 배출구에서는 98.32%로 나타났다. 또 흡연부스 내부에서의 미세먼지 제거효율은 98.59%이며, 배출구에서는 98.85%로 나타나 미세먼지 제거효율은 매우 우수한 것으로 나타났다. TVOCs는 흡연부스 내부에서는 $26,000{\mu}g/m^3$에서 $5,203{\mu}g/m^3$로 감소하여 79.99%의 제거효율로 나타났고, 환풍기 가동 후 방지설비 배출구에서는 $5,019{\mu}g/m^3$로 측정되어 제거효율은 80.70%로 나타났다. 따라서 본 연구를 통하여 제작, 설계된 흡연부스는 향후 소규모 작업환경 내에서도 각종 유해오염물질들을 제거하는 용도로 적용할 수 있을 것으로 생각된다.

• 한국습지학회지
• /
• 제10권2호
• /
• pp.129-141
• /
• 2008

본 연구는 도심지 유역인 경기도 부천 여월동 단지 내 도시하천의 수질 특성을 분석하고 평가하고자 한다. 해당 유역의 하천은 차집관로에 의한 생활하수와 평시 흐름의 차단으로 인하여 매우 적은 유량만이 흐르고 있고, 각종 하수와 오염원의 유입으로 수질 오염 및 악취 발생 등의 문제를 안고 있다. 따라서 본 연구에서는 수질 현황을 파악하고 수질 개선책을 제시하기 위하여 수질 모니터링을 시행하였으며, 해당 유역의 특성과 조사 결과를 이용하여 QUAL2E 모형을 통한 수질 모델링을 구축하고, 이를 이용해 수질특성과 향후 미래 수질을 검토하였다. 검토 결과 주거지역내 소하천의 경우 오염원의 유입에 따라서 수질이 크게 변화하며 비점오염원에 대해서도 불안요소를 포함하고 있는 것으로 나타났다. 본 연구 대상지역의 경우 유지유량 공급과 오염원의 차단이 중요할 것으로 판단된다.

• 한국수산과학회지
• /
• 제50권6호
• /
• pp.650-655
• /
• 2017

Extraction methods for cultured sea mussels Mytilus edulis and the quality characteristics of resulting extracts were investigated. The crude protein, carbohydrate and volatile basic nitrogen content of raw sea mussels was 15.2%, 1.9%, and 11.2 mg/100 g, respectively. Extracts were prepared using three different methods: hot-water extract (WE), scrap enzymatic hydrolysate extraction (SE), and complex extraction (CE). The respective extracts contained 5.5%, 8.6%, and 6.6% crude protein; 281.7, 366.0, and 343.0 mg/100 g amino nitrogen,: and 2.0%, 1.1% and 1.8% salinity. Their extraction yields were 689, 323, and 1,012 mL/kg. The CE method was superior to the traditional WE method in terms of extraction yield, amino-nitrogen content, and organoleptic qualities, but not odor. Active taste components were evaluated and the total free amino acid content of the WE and CE methods was 5,667.0 and 7,006.3 mg/100 g, respectively. The concentrations of major components (for WE and CE methods, respectively) were as follows: glutamic acid (1,244.0 and 955.4 mg/100 g), taurine (987.9 and 746.8 mg/100 g), glycine (721.2 and 847.0 mg/100 g), alanine (341.9 and 423.8 mg/100 g), arginine (265.5 and 376.5 mg/100 g), lysine (199.8 and 270.4 mg/100 g), and proline (253.9 and 220.3 mg/100 g). In conclusion, these results demonstrate that there is potential for using the CE method to expand the commercial utilization of sea mussels as a flavoring substance resource.

• Journal of Microbiology and Biotechnology
• /
• 제27권12호
• /
• pp.2199-2210
• /
• 2017

Soil burial is the most widely used disposal method for infected pig carcasses, but composting has gained attention as an alternative disposal method because pig carcasses can be decomposed rapidly and safely by composting. To understand the pig carcass decomposition process in soil burial and by composting, pilot-scale test systems that simulated soil burial and composting were designed and constructed in the field. The envelope material samples were collected using special sampling devices without disturbance, and bacterial community dynamics were analyzed by high-throughput pyrosequencing for 340 days. Based on the odor gas intensity profiles, it was estimated that the active and advanced decay stages were reached earlier by composting than by soil burial. The dominant bacterial communities in the soil were aerobic and/or facultatively anaerobic gram-negative bacteria such as Pseudomonas, Gelidibacter, Mucilaginibacter, and Brevundimonas. However, the dominant bacteria in the composting system were anaerobic, thermophilic, endospore-forming, and/or halophilic gram-positive bacteria such as Pelotomaculum, Lentibacillus, Clostridium, and Caldicoprobacter. Different dominant bacteria played important roles in the decomposition of pig carcasses in the soil and compost. This study provides useful comparative date for the degradation of pig carcasses in the soil burial and composting systems.

• 한국환경과학회지
• /
• 제18권7호
• /
• pp.709-714
• /
• 2009

Catalytic activities of $V_2O_5/TiO_2$ catalyst were investigated under reaction conditions such as reaction temperature, catalyst size, inlet concentration and space velocity. A 1,2-dichlorobenzene(1,2-DCB) concentrations were measured in front and after of the heated $V_2O_5/TiO_2$ catalyst bed, and conversion efficiency of 1,2-DCB was determined from it's concentration difference. The conversion of 1,2-DCB using a pellet type catalyst in the bench-scale reactor was lower than that with the powder type used in the micro flow-scale reactor. However, when the pellet size was halved, the conversion was similar to that with the powder type catalyst. The highest conversion was shown with an inlet concentration of 100 ppmv, but when the concentration was higher or lower than 100 ppmv, the conversion was found to decrease. Complete conversion was obtained when the GHSV was maintained at below 10,000 $h^{-1}$, even at the relatively low temperature of $250^{\circ}C$. Water vapor inhibited the conversion of 1,2-DCB, which was suspected to be due to the competitive adsorption between the reactant and water for active sites.

• 한국물환경학회지
• /
• 제25권4호
• /
• pp.597-605
• /
• 2009

Algae bloom occurred in reservoir in summer can cause taste and odor in water and disturb the flocculation and sedimentation processes in water treatment plant and cause sand filter plugging. It was also reported that microcystins, anatoxin and saxitoxin released from cyanobacteria had acute toxic effects on liver and nervous system. For these reasons, many advanced countries inclusive of WHO set the guideline for these toxins and cyanotoxins have been managed with regular monitoring in Korea as well. However, complex sample preparation steps such as a solid phase extraction (SPE) and derivatization are required with an existing analysis method with HPLC. We needed to improve an analysis method for low extraction efficiency and long sample preparation time. In this study, we have established a new LC/MS/MS method which can simultaneously determine 6 cyanotoxins (Microcystins-LR, Microcystins-RR, Microcystins-YR, Anatoxin-a, Saxitoxin, Neosaxitoxin) with only simple filtration step. When $75{\mu}L$ filterated sample was injected onto the LC-MS/MS, the recovery ranged from 86% to 112% and the MDL was $0.025{\sim}0.581{\mu}g/L$. We can make the MDL be lower than the guideline ($1{\sim}3{\mu}g/L$) of advanced countries with simple preparation.

• 한국치위생학회지
• /
• 제22권2호
• /
• pp.125-132
• /
• 2022

Objectives: The purpose of this study was to examine the relationship between stress and halitosis in a representative sample of Korean adolescents. Methods: This study was based on the 15th Korea Youth Risk Behavior Survey (2019). The final participation rate in the survey was 95.3%; 57,303 out of 60,100 (95.3%) adolescents aged 13-18 years were selected. Multiple logistic regression with complex samples was performed to identify the correlation between stress and halitosis. Stress level was classified as 'very much', 'a little', and 'not much' and halitosis was defined as the presence of an unpleasant odor in the oral cavity. Results: The prevalence of halitosis among students was 21.3%. As a result of multiple regression analysis, the 'a little' [odds ratio (OR); 1.39, 95% confidence interval (CI); 1.29-1.49] and 'very much' stress group (OR; 1.78, 95% CI; 1.66-1.90) exhibited significantly higher risk of halitosis than the 'not much' stress group. Conclusions: A significant correlation between stress and halitosis exists among Korean adolescents. Therefore, psychological factors such as stress should be considered in managing halitosis in adolescents.

• 한국환경농학회지
• /
• 제19권1호
• /
• pp.44-50
• /
• 2000

MS균을 이용한 음식폐기물의 효율적인 처리 방법의 모색과 양돈사료 자원화를 위한 기초자료를 확보하고자 처리방법에 따른 사료성상, 조성분, 광물질 및 유해 중금속을 분석한 결과 다음과 같은 결론을 얻었다. MS균을 처리하기전 수거된 음식폐기물은 그 배출원과 수집일에 따라 성상 및 조성분 성분이 다양하였으며, 음식폐기물 집하장에서 건조처리전 수거된 시료의 수분 함량은 계절적 요인에 크게 영향을 받았다. MS균에 의한 발효 공정을 거친 후 음식폐기물의 악취가 거의 소멸되었고, 사료로서의 좋은 성상을 보여주었다. 특히, 조지방 및 조단백질 함량이 높은 사료자원으로 평가되었다. MS균 처리 후 음식폐기물의 광물질 함량 분석결과 다량원소 (특히 칼슘)의 함량이 곡류나 농산부산물보다 높았다. 전반적으로 다른 식물성 및 동물성 단미사료원에 비해 균형있는 광물질 구성 및 함량을 가지는 것으로 분석되었다. MS균 처리 전과 후 처리과정 중 음식폐기물내의 중금속 분석결과 수은, 비소, 불소 및 크롬은 미검출되었고 납과 카드뮴은 미량존재하나 배합사료내 허용범위에 훨씬 낮은 수준을 함유하고 있어 사료자원으로의 재활용함에 있어 안전한 것으로 나타났다. 이상의 결과로부터 음식폐기물의 성상 및 사료성분을 고려할 때, 적절한 처리 및 발효공정을 통해 양돈사료자원으로서 재활용될 수 있는 충분한 가치가 있음을 제시한다.