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作 者:陈明[1] 周俊虎[1] 张立宏[1] 程军[1] 刘建忠[1] 岑可法[1]
机构地区:[1]能源清洁利用国家重点实验室(浙江大学),杭州310027
出 处:《太阳能学报》2008年第6期738-744,共7页Acta Energiae Solaris Sinica
基 金:国家自然科学基金(50406022);国家高技术研究发展计划(863)项目(2006AA05Z122);全国优秀博士学位论文作者专项资金资助项目(200437);霍英东高等院校青年教师优选资助项目(104021);浙江省科技攻关计划项目(2006C33049)
摘 要:通过固定化光合细菌对低分子有机酸进行了光合产氢的批式试验研究。利用修正的Gompertz方程进行产氢动力学分析,并且对产氢过程中pH变化、有机酸的氢转化率以及有机酸初始浓度对产氢的影响等进行了分析。结果表明固定化能提高产氢率,以海藻酸钠为固定化载体的产氢效果最佳。同时发现有机酸产氢存在最佳初始浓度,其中乳酸产氢的最佳初始浓度为0.049mol/L,对于乙酸、丙酸和丁酸这3种小分子羧酸,其最佳初始浓度的大小随着有机酸碳原子数的增加而减小,即乙酸(0.043mol/L)>丙酸(0.029mol/L)>丁酸(0.022mol/L)。乙酸的最大氢转化率最高,达到65.3%。浓度对氢气含量没有影响,而对于乙酸、丙酸和丁酸,氢气含量随着有机酸碳原子数的增加而增大。For utilizing volatile fatty acids (VFAs) produced in the process of wastewater treatment, hydrogen photoproduction from VFAs by immobilized photosynthetic bacteria were studied. A modified Gompertz model was adopted to describe the hydrogen production. The results indicated that hydrogen yield of immobilized cells is higher than that of free cells, and sodium alginate is a suitable immobilized carrier for hydrogen production. Furthermore, pH change, hydrogen conversion efficiency and the effect of initial concentration of VFAs on hydrogen production were analyzed. The results demonstrate that higher concentration of VFAs is detrimental to hydrogen production, and the optimal initial concentration of lactic acid is 0.049mol/L. For acetate, propionate and butyrate, the optimal initial concentration decreases with carbon atom numbers of VFAs increasing, and following the order of acetate 〉 propionate 〉 butyrate. The highest hydrogen conversion yield of 65.3% was achieved from acetate. For acetate, propionate and butyrate, hydrogen percentage increased with carbon atom numbers of VFAs increasing, and initial concentration of VFAs has no effect on hydrogen percentage.
分 类 号:TK511.5[动力工程及工程热物理—热能工程]
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