• 한국산업보건학회지
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• 제29권4호
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• pp.442-451
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• 2019

Objectives: The aim of this study was to review the reduction methods for ammonia (NH₃) and hydrogen sulfide (H₂S) exposure in livestock. Methods: By reviewing domestic and international research reports from Korea and China, reducing ammonia and hydrogen sulfide in livestock pens was analyzed in terms of ventilation, deodorant, and feed additives. In addition, exposure limits in Korea and China were examined through a comparison between 'TLV-TWA and STEL under the Industrial Safety and Health Act in Korea' and 'Management Standards for Air of Livestock Pens in China'. Results and Discussion: In order to effectively control hazardous gases and odors in livestock pens, the enhancement of natural ventilation or the addition of ventilation fans at the pollution source are being examined. Deodorants are used as adsorbents or masking deodorants. Additives to feed were zeolite powder, FeSO₄·7H₂O, enzymes, and microbial preparations. Use of feed additives was low-cost and had significant effects compared to other methods. Zeolite was the most commonly used in feed additive in Chinese cases and proved to be low-cost and effective for reducing harmful gases. Enzyme preparations were shown to stimulate the growth of livestock, but were expensive. Conclusions: This study reviewed and examined domestic and international research papers in Korea and China for reducing ammonia and hydrogen sulfide concentrations in livestock pens. More diverse research and the development of feed additives are needed.

• 대한환경공학회지
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• 제31권1호
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• pp.64-69
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• 2009

수돗물에서 geosmin과 2-MIB에 의한 곰팡이와 흙냄새는 소비자들에 대한 수돗물불신의 주된 요인이다. 따라서 geosmin과 2-MIB의 조기 검출 및 분석방법은 이취미 문제를 예방하는데 있어서 중요한 부분이다. 본 연구에서는 교반막대 추출법 (SBSE)과 GC/MS를 이용하여 geosmin과 2-MIB의 분석방법에 대하여 살펴보았다. 용매를 사용하지 않고 시료를 추출하는 SBSE 방법을 최적화하여 수중의 geosmin과 2-MIB를 분석하는데 적용하였다. 실험 결과 SBSE 방법은 간단하고 신속한 분석이 가능하여 소량(10~20 mL)의 시료를 사용하여 한 번에 많은 시료를 동시에 분석할 수 있었다. 그리고 SBSE 방법은 높은 회수율과 재현성을 보였다. 검출한계는 1~2 ng/L 이었으며 정량한계는 3~6 ng/L 이었다. 무엇보다도 SBSE는 수중의 geosmin과 2-MIB를 분석하는 데에 매우 신뢰성이 있고 실용적인 방법이라고 판단된다.

• 생명과학회지
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• 제17권12호
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• pp.1616-1621
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• 2007

발효된 오이의 산패는 원하지 않는 미생물의 2차적 생장에 의한 결과이며 장기보관을 원하는 발효오이 식품은 일반적으로 고농도의 염을 사용한다. 염의 농도를 최소한으로 하면서 산패를 방지할 수 있는 pH의 범위를 모색하기 위하여 다양한 조합의 pH와 NaCl 농도를 갖는 발효오이즙(FCS) 배양액에 3가지 종류의 산패액을 각각 접종하여 발효오이의 산패여부를 조사하였다. pH3에서는 NaCl의 첨가가 없더라도 산패는 일어나지 않는데 비하여 pH 5.0에서는 4%의 NaCl에서도 모두 산패가 진행되었다. pH 3.5, pH 4, pH 4.5 에서는 0%와 2% NaCl의 범위 내에서 다양한 결과를 보였다. 이 결과를 바탕으로 발효오이의 산패를 예견할 수 있는 조견표를 작성하였다. 조견표의 사용은 발효오이의 장기보관을 위한 적절한 산도와 염의 농도의 선택을 가능하게 할 것이다.

• 한국초지조사료학회지
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• 제33권4호
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• pp.252-256
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• 2013

본 연구는 양돈 슬러리의 악취물질 감소에 효과가 있는 것으로 확인된 물질의 효능을 비교분석하기 위하여 수행되었다. 페놀류 농도는 고추냉이와 아몬드피 구에서 낮았고, 인돌류 농도는 아몬드피 구에서 가장 낮았다(p<0.05). 따라서 슬러리에 아몬드피를 첨가하면 VOC 농도가 감소되었다. SCFA 농도는 팽이버섯폐배지와 아몬드피 구에서 높았고, BCFA 농도는 대조구에 비해 다른 모든 처리구에서 낮았다(p<0.05). 또한 슬러리의 pH는 팽이버섯폐배지와 아몬드피 구에서 낮았다(p<0.05). 따라서 팽이버섯폐배지 또는 아몬드피를 슬러리에 첨가하면 SCFA 농도는 증가되고 BCFA 농도는 감소되는 것으로 나타났다.

• 한국컴퓨터정보학회논문지
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• 제24권11호
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• pp.171-178
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• 2019

본 연구에서는 노인요양병원의 실내공기질 관리계획을 제안하고자 노인요양병원의 실내공기질 수준을 측정하고 근무자의 실내공기질에 대한 인식에 대하여 조사하였다. 측정 항목은 온도, 습도, CO2, CO, PM10, VOC이며 2019년 4월 26일에 실시하였다. 설문 조사에 따르면 실내 공기질에 대한 만족도가 낮을수록 실외 공기질이 더 좋다고 응답하였으며 실내환경 요소 중 악취가 가장 낮은 것으로 응답하였으며 실내 공기질의 만족도가 높을 경우 실내환경 요소의 만족도도 높은 것으로 분석되었다. 다중응답 분석결과 "환기 부족"이었고 회귀 분석 결과 "공기질 관련성" 항목이 가장 낮은 것으로 분석되었다. 노인 요양 병원의 실내 공기질 환경을 최고 수준으로 유지하려면 냄새를 제거하기 위한 환기 장지를 추가로 설치하고 자연 환기 횟수를 늘리고 정기적인 환기담당자를 지정해야 할 것으로 판단된다. 이러한 계획을 수립함으로써 노인요양병원 근무자에게 최상의 서비스를 제공하기 위한 실내 공기질 환경을 제공 할 수 있다.

• 한국농공학회논문집
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• 제61권6호
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• pp.21-30
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• 2019

Livestock odor is comprised of mixed type of odorous compounds. Among these, ammonia ($NH_3$) and hydrogen sulfide ($H_2S$) are the two known major odor causing substances. Because high odor concentration reduces productivity of livestock and causes damage to the surrounding communities, quantitative analysis is needed to manage the odor inside and outside the livestock facilities. It is also necessary to evaluate odor dispersion according to the distance between the receptors taking into account the influence of odor source and weather condition. Therefore, in this study, we tried to evaluate the internal environment and odor dispersion from experimental pig house considering weather conditions. An experimental farm was specifically selected to eliminate the interference of odors generated by adjacent farms. $NH_3$ and complex odor were quantitatively analyzed using a gas detector and air dilution sensory method. The concentration of $NH_3$ and complex odor in pig house showed a distinct concentration difference according to the cleaning and ventilation conditions. $NH_3$ concentration and complex odor was lower than emission standard in the pig house and at the site boundary. The average $NH_3$ concentration (P1~P3) and the $NH_3$ concentration at the site boundary (S1) were strongly correlated with R=0.77. While the correlation for complex odor inside and at the site boundary had R=0.52. The correlation coefficient between $NH_3$ and the complex odor was 0.80.

• 한국물환경학회지
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• 제37권4호
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• pp.306-314
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• 2021

The application of organic fertilizer could be accompanied by potential hazards to soil and humans due to trace metals. Livestock manure compost·liquefied fertilizer is a well-established approach for the stabilization of nutrients and the reduction of pathogens and odors in manures, which can be evaluated as compost·liquefied. In this study, the livestock manure compost·liquefied fertilizers produced at 333 liquid manure public resource centers and liquid fertilizer distribution centers were collected from May to December 2019. The nutrient content (nitrogen, phosphorus, and potassium), physicochemical properties, and heavy metal content were investigated. The livestock manure compost·liquefied fertilizer was measured using a mechanical maturity measurement device. The organic matter, arsenic, cadmium, mercury, lead, chromium, copper, nickel, zinc, E. coli (O157:H7), Salmonella, etc. of the livestock manure compost·liquefied fertilizers were analyzed. The average heavy metal content in the livestock manure compost·liquefied fertilizer was as follows: Cr 2.9 mg/kg (0.2~8.7 mg/kg), Cu 20.4 mg/kg (1.6~74.1 mg/kg), Ni 1.3 mg/kg (0.4~4.2 mg/kg), and Zn 79.8 mg/kg (3.0~340.7 mg/kg). Although large-scale organic fertilizer plants and resources recycling centers produce good organic (liquid) fertilizers with proper components, it is necessary to standardize livestock manure compost·liquefied fertilizer in order to facilitate efforts to turn livestock manure into useful resources.

• 한국포장학회지
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• 제27권2호
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• pp.55-62
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• 2021

This study aims to reduce the rancid odor generated during the fermentation process of kimchi by inserting zinc oxide (ZnO) into an inorganic porous material with a high surface area to decompose or adsorb the fermentation odor. ZnO activated by the presence of moisture exhibits decomposition of rancid odors. Mixed with Titanium dioxide (TiO₂), a photocatalyst. To manufacture the packaging liner used in this study, NaOH, ZnCl₂, and TiO₂ powder were placed in a tank with diatomite and water. The sludge obtained via a hydrothermal ultrasonication synthesis was sintered in an oven. After being pin-milled and melt-blended, the powders were mixed with linear low-density polyethylene (L-LDPE) to make a masterbatch (M/B), which was further used to manufacture liners. A gas detector (GasTiger 2000) was used to investigate the total amount of sulfur compounds during fermentation and determine the reduction rate of the odor-causing compounds. The packaging liner cross-section and surface were investigated using a scanning electron microscope-energy dispersive X-ray spectrometer (SEM-EDS) to observe the adsorption of sulfur compounds. A variety of sulfur compounds associated with the perceived unpleasant odor of kimchi were analyzed using gas chromatography-mass spectrometry (GC-MS). For the analyses, kimchi was homogenized at room temperature and divided into several sample dishes. The performance of the liner was evaluated by comparing the total area of the GC-MS signals of major off-flavor sulfur compounds during the five days of fermentation at 20℃. As a result, Nano-grade inorganic compound liners reduced the sulfur content by 67 % on average, compared to ordinary polyethylene (PE) foam liners. Afterwards SEM-EDS was used to analyze the sulfur content adsorbed by the liners. The findings of this study strongly suggest that decomposition and adsorption of the odor-generating compounds occur more effectively in the newly-developed inorganic nanocomposite liners.

• 한국농공학회논문집
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• 제64권6호
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• pp.55-63
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• 2022

Odors emitted from pig houses have been a constant root of legal issues in pig farming. These gases are among the main causes of health and mental stresses to nearby communities, so policymakers and researchers continuously study to reduce the concentration of odorous gases from pig facilities. A continuous field experiment proved that the concentration of odor emissions inside the pig houses is highly dependent on ventilation rate, breeding details, and animal activities. However, the standard odor emission rate worldwide widely varies due to differences in pig house designs and ventilation requirements. Thus, this study aimed to measure the odor emission rates, considering the actual condition of selected Korean pig houses, through field measurement. The odor measurements were performed at three different pig production facilities without odor abatement technologies. The target experimental pig houses were buildings for weaning, growing, and fattening pigs. Results showed that the actual ventilation rate in target pig houses falls below the standard ventilation requirement of pigs, resulting in high odor concentrations inside the pig houses.

• 웰빙융합연구
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• 제5권4호
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• pp.51-56
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• 2022

Purpose: By applying an ultrasonic mechanical device to the liquid fertilizer storage in the pig dropping treatment plant, the initial odor of the odor source is reduced, and the air dilution drainage of the complex odor is fundamentally recognized to facilitate odor treatment on the mechanical and chemical biological treatment devices at the rear. Research design, data and methodology: The odor concentration on the site boundary was measured to confirm the state of reduction. In order to prevent the spread of odor from the collection of the pig dropping treatment plant, it was measured by installing an ultrasonic generator inside the installation wall after installing the sealing wall. Results: The average value of the March and April measurement data remained close to neutral at 8.2 after 8.6 treatment before pH treatment, decreased 97.3% from 462 mg/L before SS treatment to 10.5 mg/L after treatment, and the composite odor was reduced by 85% from 20 to 3 before treatment. It was confirmed that ammonia (NH3) was reduced by 99% from 5.8 ppm to 0.09 ppm, and general bacteria were also reduced by 99% from 3,200 CFU/mL to 57 CFU/mL Conclusion: Applying the ultrasonic air ejector hybrid system and zigzag air complex module development product to resource circulation centers or sewage treatment facilities is thought to reduce inconvenience to residents due to odors caused.