Study of anaerobic digestion to produce biogas from de-aggregation organic waste

• Main Authors: Chen, Kuan-Ju, 陳冠儒
• Other Authors: Tseng, Chin-Ping
• Format: Others
• Language: zh-TW
• Published: 2017
• Online Access: http://ndltd.ncl.edu.tw/handle/az48fw

碩士 === 國立交通大學 === 分子醫學與生物工程研究所 === 106 === Petrochemical fuel damage environment and produce green-house gas emission. The researches for alternative energy can meet the environment protection. Biogas is one of good choose for alternative energy because it turns waste into energy and produces a similar heat value as natural gas. According to UN statistical data, the agricultural biomass is generated more and more for every year. The energy efficiency is equivalent to 25 percent of global oil production. The agricultural waste is composed of cellulosic compounds that are aggregated by pentose or hexose. They will be excellent biogas materials after destructed structure pretreatment. The agricultural cellulosic waste is generated about 2.12 million tons every year in Taiwan. The kinds of agricultural waste are rice straw, sugarcane bagasse and wood dust. This study utilizes INRI cellulosic de-aggregation technology which uses steam explosion or acid-catalyzed steam explosion to destruct cellulosic structure. The de-aggregation cellulosic materials would enhance biodegradability and biogas production by anaerobic digestion. In this study, we examined biogas potential of different agricultural wastes and adjust the parameters (e.g pH value or C/N ratio) of anaerobic digestion. Since the pig farms produce lots of wastewater in Taiwan which water are nitrogen-rich and it can adjust high carbon materials to appropriate C/N ratio. Furthermore, we set up a lab-scale continuously anaerobic digestion to simulate the actual fermentation conditions. The results demonstrated that adjust the conditions of de-aggregation cellulosic material and anaerobic digestion enhancement of biogas production. The de-aggregation of rice straw, sugarcane bagasse and wood dust were the best performance for biogas production at pH= 6-7. They produced 313, 213 and 282 ml/gTS, respectively. In C/N ratio treatment group, the best conditions were C/N= 20, which produced 256, 250 and 251 ml/gTS, respectively. The co-digestion was de-aggregation rice straw and pig wastewater. In the continues anaerobic digestion, addition 1% dry weight of wastewater volume could produce 315 ml/gTS.