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장동화,권경석,양병준,김종복 (사)한국축산환경학회 2022 한국축산시설환경학회지 Vol.24 No.2
The broiler farms have been emphasizing the importance of moisture management in broiler litter. However, in farms, it is hard to manage the moisture of broiler litter during the breeding period due to lack of labor. In order to automate the moisture management of broiler litter, a method of monitoring the moisture of the litter is needed. This study analyzed the spectral characteristics of broiler litter according to moisture content using hyperspectral imaging to check the possibility of identifying the moisture content by camera image. Hyperspectral images of litter with moisture content of 0%, 19.3%, 31.1%, and 39.8% were acquired using a hyperspectral imaging system and spectral characteristics of them were comparatively analyzed according to preprocessing. The effective wavelengths were selected base on the pearson correlation coefficient between the images and the moisture content. Then, the best preprocessing and wavelength was selected by the standard deviation of reflectance from images. The result of the analysis showed that 556~580, 1176~1237, 1327~1647 nm bands with SG+2nd derivatives were best for identifying the moisture content of broiler litter.
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박소연,황옥화,양병준,박준수 (사)한국축산환경학회 2022 한국축산시설환경학회지 Vol.24 No.2
Ammonia is an odorous substance, and it also forms secondary particle matter by causing chemical reactions with sulfur oxides and nitrogen oxides in the atmosphere. In this study, to evaluate the ammonia emission from weaned pigs, the ammonia concentration and ventilation rate were measured in mechanicaly-ventilated pig house. The measurement was conducted for about 45 days using INNOVA, a real-time measuring device based on photoacoustic spectroscopy. As a result, the average ammonia concentration in the pig house was about 3 ppm and the ventilation rate was 55 m3/h/pig. Finally, the ammonia emission from the weaned pigs in mechanically-ventilated pig house was about 1.6 g/day/pig. However, since ammonia emissions can vary by seasonal characteristics, it is considered that a long-term study of ammonia emission characteristics by season is needed to evaluate.
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젖소분뇨 고액분리여액의 중온 액비화에 따른 암모니아 발생량 평가
박소연,이상락,김성우,양병준,최용준 (사)한국축산환경학회 2024 한국축산시설환경학회지 Vol.26 No.1
This study was conducted to investigate the digestion characteristics and to evaluate ammonia emission on the dairy manure leachate after solid-liquid separation during mesophilic aerobic digestion. Aerobic digestion was carried out following the recommended criteria for livestock manure resource management. Dairy manure leachate after solid-liquid separation was uniformly mixed and diluted to approximately 10,000 ppm based on the biological oxygen demand (BOD) criterion, and no mixing was performed at 39°C. Aeration was set at 0.03 m3 air/m3 /min, and the daily water loss due to evaporation was replenished at a similar temperature to the liquid. Temperature, pH, ammonia gas production, COD, suspended solids (SS), total nitrogen (TN), total phosphorus (TP), and total potassium (TK) contents were measured and analyzed during the experimental periods. The statistical analysis of the research results was conducted using in SAS MIXED PROC, and significance was tested at p < 0.05. During the 30-day aerobic digestion of dairy manure leachate, the pH increased from 7.6 to 8.2, ammonia levels increased until the 7th day and then gradually decreased until the 30th day, and COD decreased by approximately 88%, SS by approximately 79%, TN by approximately 71%, TP by approximately 22%, and TK by approximately 25%. In this study, it is predicted that aerobic digestion of dairy manure leachate, following the recommended BOD criteria (10,000 ppm) for livestock manure resource management, would excrete approximately 136.44 mg/m2 of ammonia and produce liquid compost with an organic matter content of around 20%.
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황옥화,조슈아나이젤할더,박소연,박준수,양병준 한국냄새환경학회 2023 실내환경 및 냄새 학회지 Vol.22 No.1
This study evaluates the ammonia (NH3) reduction effect of Bio-curtains (hereinafter referred to as curtains) utilized for odor control in pig farms based on the distance outside the curtain and the spraying condition. The curtain (total area: 37.9 m3 ) was constructed with two layers of light-shielding screens stretched over a rectangular parallelepiped structure installed around a ventilation fan (630 mm) on the side wall of a pig barn where 48 finishing pigs were reared. The real-time NH3 concentration was measured by using a photoacoustic spectrometer. In the first part of this study, the NH3 measurement position for each side of the curtain was selected based on the lowest standard deviation among 4 to 8 initial sampling points on the surface of the curtain and utilized for both experiments of distance and spraying. In the experiment concerning the distance outside the curtain, ammonia concentration decreased by 17.45% at 2 m compared to the distance at 5 cm and by 6.94% at 4 m compared to 2 m on average. In contrast, the NH3 reduction rate for each distance compared to the ventilation fan was the lowest at the 100% operating rate in which the exhausted NH3 concentration from the ventilation fan was low. At this time, the spraying mist on the inside of the curtain increased the NH3 reduction rate by 4.98 to 10.36% compared to the non-spraying condition. Consequently, the NH3 be reduced as distance outside the curtain increases due to the diffusion effect caused by the surrounding wind and the spraying mist on the inside curtain on the dissolution of NH3.
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