进水COD浓度变化对连续流搅拌槽式发酵制氢系统的影响  

EFFECT OF INFLUENT COD CONCENTRATION ON PERFORMANCE OF BIOHYDROGEN PRODUCTION IN CONTINOUS STIRRED TANK REACTOR

作　　者：韩伟[1] 陈红[1] 王占青[1] 李永峰[1,2] 杨传平[1] 

机构地区：[1]东北林业大学林学院,哈尔滨150040 [2]上海工程技术大学化学化工学院,上海201620

出　　处：《太阳能学报》2012年第12期2038-2043,共6页Acta Energiae Solaris Sinica

基　　金：国家高技术研究发展(863)计划(2006AA05Z109);上海市重点科技攻关项目(071605122);东北林业大学优秀博士学位论文培育计划(GRAP09)

摘　　要：利用糖蜜废水作为发酵底物,以连续流搅拌槽式反应器(CSTR)作为反应装置,探讨进水COD浓度变化对厌氧发酵产氢效能的影响。结果表明:在水力停留时间(HRT)为6h,温度为36℃时,CSTR反应器进水COD浓度在2～8g/L范围内变化,即有机负荷(OLR)=8～32kg/(m3.d),系统产氢效率和生物量(以挥发性悬浮固体VSS计)随进水浓度的提高而增加,并在进水COD浓度为6g/L时,得到最大产气量和产氢量分别为23.49L/d和8.19L/d。在液相末端产物中,乙醇和乙酸为主要代谢产物,占液相产物总量的82%,为乙醇型发酵。然而,当进水COD浓度升高到8g/L后,生物量和产氢量呈下降趋势,这表明产氢污泥的形成在高浓度底物下可能受到抑制。系统中的产酸发酵类型由乙醇型发酵变为混合酸发酵。发酵气体中H2含量并未随进水浓度的变化而出现明显差异,这反映出CSTR反应器是一个相对稳定的制氢系统。The continuous stirred tank reactor （CSTR） loading rates （OLR） of 8-32kg COD/（ m3.d） （ COD ： Increasing substrate concentration （2.0-6.0g/L） gave for bio-hydrogen production was operated under the organic Chemical Oxygen Demand） with molasses as the substrate. better biomass content and hydrogen production, signifying that the average cellular activity for H2 production may be enhanced as the substrate concentration increased. The overall maximal biogas and hydrogen production yield were 23.49L/d and 8.19L/d, respectively, both of them occurred at 6g/L. The major soluble products from hydrogen fermentation were ethanol and acetic acid, accounting for 59% and 23% of total liquid fermentation products, respectively. Thus, the dominant H2 producers in the mixed culture belonged to acidogenic bacteria that underwent ethanol-type fermentation. However, the biomass con- tent and hydrogen production yield tended to decrease as the substrate concentration increased to 8g/L, suggesting that granular sludge formation and cellular activity for H2 production may be inhibited at high substrate concentra- tion. Ethanol, acetic, butyric 31%, 24%, 20% and 18%, and propionic were the main which formed the mixed-type considerably regardless of changes in substrate concentration. liquid fermentation products with the percentages of fermentation. The gas phase H2 content did not vary This reflects that the CSTR was a relatively stable n2- producing system.

关 键 词：生物制氢 厌氧发酵 进水COD浓度 生物量 乙醇型发酵 

分 类 号：TK6[动力工程及工程热物理—生物能]