• Research article

    A case study on piggery farm scale liquid manure pit recharge system

    양돈 농가형 액비순환시스템 설치 사례 연구

    Gab One Han, Hak Jun Kim, Gap Un Han

    한갑원, 김학준, 한갑운

    Recently, several swine farmers are trying to install a “Liquid Manure Pit Recharge System (LMPRS)” to reduce odors, but many farmers are … + READ MORE
    Recently, several swine farmers are trying to install a “Liquid Manure Pit Recharge System (LMPRS)” to reduce odors, but many farmers are suffering from a lack of related information. This research was carried out to provide information to pig farmers who want to install a LMPRS through field surveys of the LMPRS applied to several swine farmers, investigating characteristics of installation and operation, and classifying types by process. The field survey of five farms found common operation methods such as initial stabilization period (180 days), retention period in the aeration tank (30 days), temperature in the aeration tank (30°C), and mixed liquer suspended solid (MLSS) (3,000 ppm), and based on the analysis of the process flow of each farm, it was possible to classify as type 1 (periodic addition of microorganisms, no solid-liquid separation), type 2 (periodic addition of microorganisms, conduct solid-liquid separation), type 3 (no microorganisms addition, conduct solid-liquid separation), and type 3-1 (no microorganisms addition, conduct the 1st, 2nd solid-liquid separation) based on whether microorganism was continuously added or not and whether using solid-liquid separator. It is believed that this research can be used as a basic data to help farmers who wish to install LMPRS by presenting common operation and management methods and types by process. - COLLAPSE
    30 June 2021
  • Research article

    Effects of rice hull bio-char supplementation on the odor strength in the pig manure composting facilities

    왕겨탄화물 투입이 양돈농가 퇴비사 냄새강도에 미치는 영향

    Deug-Woo Han, Dong-Hyun Lee, Changhan Kim, Dongjo Yu, Dae Kwon Park, Si Young Seo, Saem-Ee Woo, Yu Na Jang, Okhwa Hwang, Min Woong Jung

    한덕우, 이동현, 김창한, 유동조, 박대권, 서시영, 우샘이, 장유나, 황옥화, 정민웅

    In this study, odor mitigating effect of rice hull bio-char was evaluated using pig manure compost as a source of odor. Two … + READ MORE
    In this study, odor mitigating effect of rice hull bio-char was evaluated using pig manure compost as a source of odor. Two odor strength indicators, complex odor and odor activity value were analysed in pig manure composting facilities at two time points, before and after rice hull bio-char (5% v/v) supplementation. When mitigating effects were evaluated, it was found that odor strength indicators, both complex odor and odor activity value (OAV) were decreased by 50% at least, within 2~3 weeks after treatment in all tested composting facilities. The mechanism of odor mitigation is still unclear, but, based on published articles, it can be assumed that carbonic adsorption and activation of microbial metabolism are the major contributors for the effect. Recent investigation on the hypothetic mechanism called Direct Interspecies Electron Transfer (DIET) suggest a weak electric conductivity on carbonic molecules might play a key role for the microbial activation. - COLLAPSE
    30 June 2021
  • Research article

    A study on the in vitro fermentation of piggery manure and the type trend of odor reducing agents used in livestock farms

    축산농가에서 사용 중인 악취 저감제의 유형 분석 및 환경개선제의 돈분뇨 in vitro 발효 평가

    Soo-Ryang Kim, Myung-Gyu Lee, Ha Guyn Sung

    김수량, 이명규, 성하균

    This study was investigated the characteristics of the types and main components of odor reducing agents used in livestock farms, and evaluate … + READ MORE
    This study was investigated the characteristics of the types and main components of odor reducing agents used in livestock farms, and evaluate the efficacy of reducing odors in pig manure through in vitro fermentation. As a result of classification according to major components, Microbial & Probiotics agents (71.3%), Amino acid supplements (11.7%), Composite type (6.1%), Silicate supplements (4.9%), Extract (2.8%), Vitamin supplements (2.0%), and Enzyme (1.0%) were investigated in that order. The Microbial & Probiotics agents (n = 176) showed that Bacillus subtilis accounted for the highest percentage, and had 106 and 1011 CFU/g. When the three biological agents (plant extracts, Bacillus subtilis-based complexes, yeast and lactic acid bacteria complexes) were evaluated an odor reduction efficacy, these agents were not shown effects on decreasing hydrogen sulfide and odor. However, ammonia was reduced by 6.06, 29.38 and 15.49% of the control group in Treatment I (plant extracts), Treatment II (Bacillus subtilis-based complexes) and Treatment III (yeast and lactic acid bacteria complexes), respectively. When bacterial changes were observed during in vitro fermentation, total bacteria was increased 1.22~4.02 × 109 CFU/g at the beginning of culture to 2.51 × 109 ~ 1.03 × 1010 CFU/g at the end of culture, and showed higher all additive-treated groups than non-additives. Bacillus subtilis increased as the incubation time, and showed higher levels in Treatment I and Treatment II than the additive-free group and Treatment III. Lactobacillus sp. decreased in all groups except for treatment I for incubation, but maintained higher levels in the additive-treated group than the non-additive group. Yeast was a level of 3.13~7.93 × 109 CFU/g at the beginning of the culture, but was not detected at the end of the culture. Livestock farms are using various odor reducing agents, and their effects vary depending on the characteristics of the products. Therefore, it is considered that understanding of odor generation in farms and characteristics of odor reducing agents should be prioritized for effective odor control. - COLLAPSE
    30 June 2021
  • Research article

    Evaluation of ammonia emission characteristics according to outside temperature variation from swine finishing barn installed with ground channel ventilation system

    지하채널 환기시스템이 적용된 비육돈사의 외기온에 따른 암모니아 발생 특성 평가

    Jinho Shin, Hee-Cheol Roh, Daehun Kim, Jisoo Wi, Woohee Chung, Seunghun Lee, Heekwon Ahn

    신진호, 노희철, 김대훈, 위지수, 정우희, 이승훈, 안희권

    This study was conducted to evaluate the ammonia emission characteristics depend on outside temperature variation, from swine finishing barn installed with ground … + READ MORE
    This study was conducted to evaluate the ammonia emission characteristics depend on outside temperature variation, from swine finishing barn installed with ground channel ventilation system. Because the temperatures of outside air were tempered in the ground channel before flowed into the swine barn, the seasonal differences in ventilation rate were not greater than the general levels. Therefore, cold weather ammonia emissions (62.4 ± 9.4 g day-1 AU-1) were higher than those (54.8 ± 6.3 g day-1 AU-1) of hot weather (p < 0.05), which result was different from the general trend. In the case of swine barn installed with temperature control system caused less ventilation rate differences during cold and hot weather, it is possible to improve the room air condition during cold weather and reduce the hot weather ammonia emissions. - COLLAPSE
    30 June 2021
  • Research article

    Correlation analysis between odorous compounds and dust emitted from swine house

    돈사에서 발생되는 악취물질과 분진과의 상관 분석

    Won Choi, Doo-Young Kim, Ki-Youn Kim

    최원, 김두영, 김기연

    The purpose of this study is to conduct field empirical evaluation of odor substances and dust concentration, which is one of particulate … + READ MORE
    The purpose of this study is to conduct field empirical evaluation of odor substances and dust concentration, which is one of particulate substances, generated inside swine house to analyze their occurrence patterns and correlations. As a result of analyzing the correlation between major odorous substances and particulate matter in the swine house, total suspended dust and ammonia, fine dust and hydrogen sulfide, fine dust and complex odor concentration, ultrafine dust and complex odor concentration, fine dust and hydrogen sulfide showed statistically significant correlation relationship (p < 0.05). Since conditions such as ventilation status, number of breeding heads, operation method, and temperature and humidity were not considered in this study, additional research considering these factors is required in the future. - COLLAPSE
    30 June 2021
  • Research article

    Comparison of the regional nutrient balance index by land and soil budget

    토지수지와 토양수지에 의한 지역 양분수지 지표 비교 연구

    Jun Hyeong Lee, Young Man Yoon

    이준형, 윤영만

    The regional nutrient management system that manages excess nutrients (nitrogen and phosphorus) of agricultural land is in the process of introducing in … + READ MORE
    The regional nutrient management system that manages excess nutrients (nitrogen and phosphorus) of agricultural land is in the process of introducing in Korea. In this study, agricultural nutrient balance indicators (GNB; Gross nutrient balance, and NNB; Net nutrient balance) were compared and analyzed by the nutrient balance analytical methodologies of land and soil budget in order to assess regional nutrient balance for nitrogen and phosphorus. The average GNB-N and NNB-N of the provincial level (si and do), which were analyzed by land budget, were 358 and 180 kg-N ha-1, and the GNB-P and NNB-P that were analyzed by land budget showed a same value of 55 kg-P ha-1. The average GNB-N and NNB-N that were analyzed by soil budget were 220 and 180 kg-N ha-1, and the GNB-P and NNB-P showed a same value of 35 kg-P ha-1. Therefore, the higher GNB-N value was gained in the methodology of land budget, and NNB-N did not show the significant difference between the methodology of land and soil budget. However, GNB-P and NNB-P showed the higher values in the both of methodologies of land and soil budget. - COLLAPSE
    30 June 2021
  • Research article

    Analysis of livestock carcass management in Japan: A case study of the rendering plant in Gunma Prefecture

    일본의 가축 폐사체 관리 현황 분석: 군마현의 화제장 (化製場) 운영사례를 중심으로

    Soo-Ryang Kim, Myung-Gyu Lee

    김수량, 이명규

    The key to managing livestock carcasses in Japan can be summarized in (1) a ban on self-treatment (disposal) by farmers, (2) a … + READ MORE
    The key to managing livestock carcasses in Japan can be summarized in (1) a ban on self-treatment (disposal) by farmers, (2) a regional management system by specialized organizations (subcontracting), and (3) a value-added strategy for by-products. And traditional methods of disposing of livestock carcasses are evolving towards advanced technologies, and the legal aspects (administrative factors) are also gradually tightened up. Due to the environmental conditions in South Korea, the management of livestock carcasses is challenging. Consequently, managing livestock carcasses on farms should be as simplified as possible. Furthermore, integrated management is required at the national level to prevent animal health problems and diseases on farms. In particular, the whole process of livestock carcass management (generation, storage, transportation, specialized organizations, resource recycling) should be monitored in a transparent system. - COLLAPSE
    30 June 2021