Fermentative Biohydrogen Production from Textile Wastewater

• Main Authors: Szu-Yu Kuo, 郭思妤
• Other Authors: Chiu-Yue Lin
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/75738161108606240637

碩士 === 逢甲大學 === 綠色能源科技碩士學位學程 === 99 === The global utilization of energy source is transiting from fossil fuels to renewable ones. Hydrogen would be an ideal and environmental friendly energy resource, because it has high heating value, and the only combustion product is water. Biological hydrogen production technology is considered as a feasible process with low pollution. Moreover, biological hydrogen production process is known to be less energy intensive, which is carried out at ambient temperature and pressure, and generate hydrogen from various kinds of organic substrates especially of waste materials containing high concentration of carbohydrate, such as agricultural waste, municipal solid waste and industrial wastewater. They would be the ideal sources for biohydrogen production and also could solve wastes/wastewaters treatment problem. This study used starch-containing wastewater collected from a textile manufactory in Miao-Li, Taiwan as the feedstock for biohydrogen production. The effects of various seed inoculums (waste activated sewage sludge from municipal and industry, cow dung and pig dung), temperature (35oC and 55 oC), cultivating pH (5.5-7.0), and acid-pretreatment pH (3.0, 4.0, 5.0) on feedstock for hydrogen production from this wastewater are presented. The results show that highest hydrogen production of 3.65 L H2/L with hydrogen content in biogas of 52.0% were observed when the experiment was carried out with activated sewage sludge from textile industrial waste seed, temperature 35 oC, non-acid-pretreatment and cultivating pH 5.5 The seed was pre-cultivated by sucrose substrate and textile wastewater feeding pH (5.5/8.0). The results show that the pre-cultivated seed cannot enhance hydrogen production, but maintaining the textile wastewater at pH 5.5 can significant increase the hydrogen production performance. An anaerobic continuous sequencing batch reactor (AC-SBR) was designed to produce hydrogen continuously. It was operated at various feeding frequencies (12 times/d, 8 times/d, 6 times/d) and subtract concentrations of 33 and 17 g soluble carbohydrate/L at HRT 24 h. The results show that, a maximum HPR of 6.18 L/L/d with H2 content of 52.2% was obtained at feeding frequency 12 times/d and substrate concentration 33 g soluble carbohydrate/L. The major liquid metabolite was butyric acid which indicates that dark anaerobic fermentation of textile wastewater was a butyric acid type fermentation. However, HPR decreased when operation time increased and corresponded to a situation that lactic acid replaced butyric acid as the major liquid metabolite.