摘要
采用连续流搅拌槽式反应器 (CSTR) ,利用厌氧活性污泥 ,在制糖废水产酸发酵过程的同时制取氢气 .探讨了生物制氢反应器连续流稳定运行的工程控制参数 .研究表明 ,在污泥接种量为 15 g/L、温度为 35℃± 1℃、COD容积负荷为 4 0kg/ (m3 ·d)、HRT为 4h、系统pH、氧化还原电位 (ORP)分别在 4 6～ 4 9、- 4 5 0～ - 4 70mV等条件下 ,可以实现连续流生物制氢反应系统乙醇型发酵的高效稳定运行 .此时 ,液相末端发酵产物中乙醇和乙酸的含量占挥发酸总含量的 80 %以上 ,COD去除率 2 2 %～2 6 % ,气相中的氢气含量约为 4 0 %～ 5 8% ,最大产氢能力为 7 6 3m3 / (m3 ·d) .
The natural response of a continuous stirred tank reactor (CSTR) for hydrogen bio-production using molasses wastewater as substrate was investigated. Emphasis was placed on assessing the operational controlling strategy on the stable operation of CSTR with high efficiency. It was found that at an initial biomass of 15g/L, an equilibrial microbial community in the ethanol-type fermentation and efficient stable operation of CSTR could be established with following conditions: temperature of 35℃±1℃, COD organic loading rate (OLR) of 40kg/(m 3·d), hydraulic retention time (HRT) of 4h, pH value of 4.6～4.9 and oxidation reduction potential (ORP) of -450～-470mV. Following that, hydrogen production in the reactor was relatively stable. The observed maximal hydrogen bio-production rate was 7.63m 3/(m 3·d). The content of hydrogen in the biogas was about 40%～58%. COD removal rate was between 22%～26%. The total content of ethanol and acetic acid in the fermentative end products was above 80%.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2004年第6期113-116,共4页
Environmental Science
基金
国家高技术研究发展计划 ( 863 )项目 ( 2 0 0 3AA5 15 0 3 0 )
关键词
生物制氢
乙醇型发酵
产氢能力
菌群
hydrogen bio-production
ethanol-type fermentation
hydrogen production rate
microbial community
