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RISS 인기검색어
- 검색키워드
- 저자 : Kenichi Furuhashi (검색결과 2 건)
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Kuroda Kazutaka,Tanaka Akihiro,Furuhashi Kenichi,Fukuju Naoki 아세아·태평양축산학회 2022 Animal Bioscience Vol.35 No.7
Objective: The objective of this study was to evaluate the effect of waste cooking oil (WCO) addition on ammonia (NH3) emissions during the composting of dairy cattle manure under two aeration conditions. Methods: The composting tests were conducted using the laboratory-scale composting apparatuses (14 L of inner volume). Three composting treatments (Control, WCO1.5, and WCO3, with WCO added at 0 wt%, 1.5 wt%, and 3 wt% of manure, respectively) were performed in two composting tests: aeration rate during composting was changed from 0.55 to 0.45 L/min in Test 1, and fixed at 0.3 L/min in Test 2, respectively. The NH3 emitted and nitrogen losses during the composting were analyzed, and the effect of the addition of WCO on NH3 emissions were evaluated. Results: Both tests indicated that the composting mixture temperature increased while the weight and water content decreased with increasing WCO content of the composting mixtures. On the other hand, the NH3 emissions and nitrogen loss trends observed during composting in Tests 1 and 2 were different from each other. In Test 1, NH3 emissions and nitrogen losses during composting increased with increasing WCO contents of the composting samples. Conversely, in Test 2, they decreased as the WCO contents of the samples increased. Conclusion: The WCO addition showed different effect on NH3 emissions during composting under two aeration conditions: the increase in WCO addition ratio increased the emissions under the higher aeration rate in Test 1, and it decreased the emissions under the lower aeration rate in Test 2. To obtain reduction of NH3 emissions by adding WCO with the addition ratio ≤3 wt% of the manure, aeration should be considered. Objective: The objective of this study was to evaluate the effect of waste cooking oil (WCO) addition on ammonia (NH<sub>3</sub>) emissions during the composting of dairy cattle manure under two aeration conditions.Methods: The composting tests were conducted using the laboratory-scale composting apparatuses (14 L of inner volume). Three composting treatments (Control, WCO1.5, and WCO3, with WCO added at 0 wt%, 1.5 wt%, and 3 wt% of manure, respectively) were performed in two composting tests: aeration rate during composting was changed from 0.55 to 0.45 L/min in Test 1, and fixed at 0.3 L/min in Test 2, respectively. The NH<sub>3</sub> emitted and nitrogen losses during the composting were analyzed, and the effect of the addition of WCO on NH<sub>3</sub> emissions were evaluated.Results: Both tests indicated that the composting mixture temperature increased while the weight and water content decreased with increasing WCO content of the composting mixtures. On the other hand, the NH<sub>3</sub> emissions and nitrogen loss trends observed during composting in Tests 1 and 2 were different from each other. In Test 1, NH<sub>3</sub> emissions and nitrogen losses during composting increased with increasing WCO contents of the composting samples. Conversely, in Test 2, they decreased as the WCO contents of the samples increased.Conclusion: The WCO addition showed different effect on NH<sub>3</sub> emissions during composting under two aeration conditions: the increase in WCO addition ratio increased the emissions under the higher aeration rate in Test 1, and it decreased the emissions under the lower aeration rate in Test 2. To obtain reduction of NH<sub>3</sub> emissions by adding WCO with the addition ratio ≤3 wt% of the manure, aeration should be considered.
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Kazutaka Kuroda,Akihiro Tanaka,Kenichi Furuhashi,Naoki Fukuju Asian Australasian Association of Animal Productio 2023 Animal Bioscience Vol.36 No.10
Objective: In our previous study, we observed that the addition of waste cooking oil (WCO) reduced ammonia (NH<sub>3</sub>) emissions during laboratory-scale composting of dairy cattle manure under low-aeration condition. Therefore, this study aimed to evaluate the effect of addition of WCO on NH<sub>3</sub> emissions reduction during pilot-scale composting of dairy cattle manure, which is close to the conditions of practical composting treatment. Methods: Composting tests were conducted using pilot-scale composting facilities (1.8 m<sup>3</sup> of capacity). The composting mixtures were prepared from manure, sawdust, and WCO. Two treatments were set: without WCO (Control) and with WCO added to 3 wt% of manure (WCO3). Composting was conducted under continuous aeration at 40 L/min, corresponding to 22.2 L/(min·m<sup>3</sup>) of the mixture at the start of composting. The changes in temperatures, NH<sub>3</sub> concentrations in the exhaust gases, and contents of the composted mixtures were analyzed. Based on these analysis results, the effect of WCO addition on NH<sub>3</sub> emissions and nitrogen loss during composting was evaluated. Results: During composting, the temperature increase of the composting mixture became higher, and the decreases of weight and water content of the mixture became larger in WCO3 than in Control. In the decrease of weight, and the residual weight and water content of the mixture, significant differences (p<0.05) were detected between the two treatments at the end of composting. The NH<sub>3</sub> concentrations in the exhaust gases tended to be lower in WCO3 than in Control. Nitrogen loss was 21.5% lower in WCO3 than in Control. Conclusion: Reduction of NH<sub>3</sub> emissions by the addition of WCO under low aeration condition was observed in pilot-scale composting, as well as in laboratory-scale composting. This result suggests that this method is effective in reducing NH<sub>3</sub> emissions in practical-scale composting.
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