ABSTRACT
Due to the recent ban of direct disposal of food waste into a landfill site, food waste reduction and recycling has been an issue in Korea. Among the alternatives to the direct land filing in the food waste management, mesophilic anaerobic digestion has been one of the most favourable optio...
ABSTRACT
Due to the recent ban of direct disposal of food waste into a landfill site, food waste reduction and recycling has been an issue in Korea. Among the alternatives to the direct land filing in the food waste management, mesophilic anaerobic digestion has been one of the most favourable options among researchers and engineers, since it can produce CH4 gas which can be used as alternative energy source, while it decomposes the waste. In addition, it does not require heat supply. However, only few anaerobic digestion systems were installed and operated in Korea mainly due to its difficulty in controlling the fluctuated influent condition i.e. wastes with fluctuating amounts, seasonal wastes and chemical characteristics of waste. Thus, operators and engineer have studied BMP test to determine optimal influent condition. BMP test provides simple means to monitor relative biodegradability of substrates and to determine methane yield of an organic material. This study was aimed to evaluate the usability of BMP tests for the design of an anaerobic digestion. In order to achieve this objective, BMP test and Bench-scale reactor were carried out to assess the methane gas production and chemical characteristics. At first, BMP test was performed to evaluate their usability for the design of an anaerobic digestion process under various VS concentrations (7%, 3%) and mixing ratios (100:0-0:100, as VS basis). As a result, the maximum biogas production under the VS concentration of 7% and VS concentration of 3% was found at the 50:50 and 25:75(Swine slurry: Food waste), respectively. In addition, the more the mixing ratio of food waste was increased, the more the pH profiles was decreased. Those results revealed that the optimum mixing ratios of food waste and swine slurry varied depending on VS concentration and the mixing ratios of food waste and swine slurry had effect on the pH profiles. However, in practice bench-scale reactors, the mixing ratio of food waste and swine slurry (70:30~30:70) and VS concentration (2%~8%) of the feed sampled from Paju local food waste and swine slurry treatment facility varied, in addition operators did not have any control on the composition of the feed. Based on the above materials, the results in bench-scale reactor showed that the methane gas production was obtained irregularly from 80 CH4_ml/VSin_g to 393 CH4_ml/VSin_g. In other words, it is impossible that the optimum mixing ratio and VS concentration of co-substrates resulted from BMP test apply to the actual anaerobic digester.
ABSTRACT
Due to the recent ban of direct disposal of food waste into a landfill site, food waste reduction and recycling has been an issue in Korea. Among the alternatives to the direct land filing in the food waste management, mesophilic anaerobic digestion has been one of the most favourable options among researchers and engineers, since it can produce CH4 gas which can be used as alternative energy source, while it decomposes the waste. In addition, it does not require heat supply. However, only few anaerobic digestion systems were installed and operated in Korea mainly due to its difficulty in controlling the fluctuated influent condition i.e. wastes with fluctuating amounts, seasonal wastes and chemical characteristics of waste. Thus, operators and engineer have studied BMP test to determine optimal influent condition. BMP test provides simple means to monitor relative biodegradability of substrates and to determine methane yield of an organic material. This study was aimed to evaluate the usability of BMP tests for the design of an anaerobic digestion. In order to achieve this objective, BMP test and Bench-scale reactor were carried out to assess the methane gas production and chemical characteristics. At first, BMP test was performed to evaluate their usability for the design of an anaerobic digestion process under various VS concentrations (7%, 3%) and mixing ratios (100:0-0:100, as VS basis). As a result, the maximum biogas production under the VS concentration of 7% and VS concentration of 3% was found at the 50:50 and 25:75(Swine slurry: Food waste), respectively. In addition, the more the mixing ratio of food waste was increased, the more the pH profiles was decreased. Those results revealed that the optimum mixing ratios of food waste and swine slurry varied depending on VS concentration and the mixing ratios of food waste and swine slurry had effect on the pH profiles. However, in practice bench-scale reactors, the mixing ratio of food waste and swine slurry (70:30~30:70) and VS concentration (2%~8%) of the feed sampled from Paju local food waste and swine slurry treatment facility varied, in addition operators did not have any control on the composition of the feed. Based on the above materials, the results in bench-scale reactor showed that the methane gas production was obtained irregularly from 80 CH4_ml/VSin_g to 393 CH4_ml/VSin_g. In other words, it is impossible that the optimum mixing ratio and VS concentration of co-substrates resulted from BMP test apply to the actual anaerobic digester.
주제어
#BMP
#swine slurry
#food waste
#co-digestion
#two-phase anaerobic digestion
※ AI-Helper는 부적절한 답변을 할 수 있습니다.