• 关键词：厌氧接触式反应器  水力停留时间(HRT)  发酵制氢  乙醇型发酵  丁酸型发酵

• 基金项目：国家自然科学基金(No.51508539);国家水体污染控制与治理重大专项(No.2014ZX07405-001)

• 昌盛
• 中国环境科学研究院 环境基准与风险评估国家重点实验室, 北京 100012

• 刘枫
• 哈尔滨工业大学 市政环境工程学院, 哈尔滨 150090

• 李建政
• 哈尔滨工业大学 市政环境工程学院, 哈尔滨 150090

• 摘要：以糖蜜废水为基质,采用两套厌氧接触式发酵制氢反应器(ACR)分别在pH为4.5~5.0、5.5~6.0下的启动和运行,以分别考察乙醇型和丁酸型发酵系统在不同水力停留时间(HRT)下的运行特性.结果显示,当进水COD=5000mg·L^-1,HRT从12h缩短至4h时,乙醇型发酵制氢系统中的产氢微生物菌属得到不断富集,在HRT=4h时,系统的产氢速率和污泥比产氢速率分别达到30.1L·d^-1和13.5mmol·g^-1·d^-1;而HRT的缩短使得丁酸型发酵系统内生物量减小,导致底物的转化率下降,反应器在HRT为8h时,系统获得最大产氢速率,为9.3L·d^-1.研究结果也表明,在HRT为4~12h的运行中,ACR乙醇型发酵系统的产氢效能始终优于丁酸型发酵制氢系统,其单位基质的氢气转化率约为丁酸型发酵的1.5~2.2倍.

• Abstract：The influence of HRT on the performance of hydrogen production with ethanol-type fermentation and butyric-type fermentation in anaerobic contact reactor (ACR) was compared in this present study. The ethanol-type fermentation and butyric-type fermentation was established by controlled the pH at 4.5~5.0、5.5~6.0, respectively. The results showed that hydrogen producing microflor was enriched in ethanol-type fermentation as the HRT was shorted from 12 h to 4 h under constant influent chemical oxygen demand (COD) 5000 mg·L^-1, and the hydrogen production rate and the specific hydrogen production rate of sludge was peaked at 30.1 L·d^-1, 13.5 mmol·g^-1·d^-1 under HRT of 4 h, respectively. Whereas in the butyric-type fermentation system, the biomass concentration was decreased as the HRT was shorted, which induced the substrate degrading efficiency declined, and the hydrogen production rate was climaxed at only 9.3 L·d^-1 under HRT of 8 h. This study showed that the hydrogen production capability of ethanol-type fermentation was advantaged over butyric-type fermentation as the HRT of ACR ranged from 4 h to 12 h, and the hydrogen yield of ethanol-type fermentation was 1.5~2.2 times as that of butyric-type fermentation.

• Key words：anaerobic contact reactor (ACR)  hydraulic retention time(HRT)  fermentative hydrogen production  ethanol-type fermentation  butyric-type fermentation

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