• 关键词：ABR  有机废水  发酵  产氢效能

• 基金项目：国家高技术研究发展计划(863)项目(No.2006AA05Z109)

• 李建政
• 1. 城市水资源与水环境国家重点实验室, 哈尔滨 150090; 2. 哈尔滨工业大学市政与环境工程学院, 哈尔滨 150090

• 蒋凡
• 1. 城市水资源与水环境国家重点实验室, 哈尔滨 150090; 2. 哈尔滨工业大学市政与环境工程学院, 哈尔滨 150090

• 郑国臣
• 1. 城市水资源与水环境国家重点实验室, 哈尔滨 150090; 2. 哈尔滨工业大学市政与环境工程学院, 哈尔滨 150090

• 摘要：以稀释糖蜜为原料,通过分阶段提高进水COD的方法,考察了四格式、总有效容积为28.75L厌氧折流板反应器(ABR)的发酵产氢效能和运行特性.结果表明,以好氧和厌氧活性污泥的混合物接种,在水力停留时间(HRT)24h、进水pH为5.3～6.8和35℃等条件下,进水COD从500mg·L^-1逐渐提高到6000mg·L^-1左右,ABR可在63d内培育出具有产甲烷功能的微生物群落体系,并达到稳定运行状态.此时,4个格室中的液相末端产物以乙酸和丁酸为主,均呈现丁酸型发酵特征,系统的COD平均去除率为37.6%,平均产氢量为3.2L·d^-1,去除单位COD的比产氢率平均为45.29L·kg^-1(以COD计).随着进水COD的提高,ABR及各格室的运行特征也随之发生变化,在进水COD提高到8000mg·L^-1并达到运行稳定状态时,后3个格室中仍有产甲烷活性的残留;前3个格室表现为乙醇型发酵,而最后1个格室的丁酸型发酵特征则得到加强;系统对COD的平均去除率降低为15.4%,平均产氢量和去除单位COD的产氢能力分别提高到12.85L·d^-1和360.22L·kg^-1(以COD计);由于诸如产甲烷菌和同型产乙酸菌的耗氢活性未被有效抑制,ABR的产氢效能受到了严重影响,虽然总产气速率和活性污泥的比产气率分别达到了61.54L·d^-1和232L·kg^-1·d^-1(以MLVSS计),但总产氢速率和活性污泥的比产氢率分别仅为12.85L·d^-1和48L·kg^-1.d^-1(以MLVSS计).

• Abstract：A 4-compartment anaerobic baffled reactor (ABR),with a total effective volume of 28.75 L,was adapted for fermentative hydrogen production from diluted molasses. After inoculation with a mixture of aerobic and anaerobic activated sludge,the ABRstarted up with a hydraulic retention time (HRT) of 24 h,influent pHranged from 5.3 to 6.8 at 35℃,while the influent CODconcentration increased gradually from 500 to 6000 mg·L^-1. After 63 days of operation,a microbial community capable of methane fermentation was obtained in the ABRand a steady state was achieved. During the steady stage,acetic acid and butyric acid dominated in the liquid fermentation products of the four compartments,indicating that butyric acid-type fermentation was established in the ABR. The ABRhad an average CODremoval of 37.6%,a hydrogen yield of 3.2 L·d^-1,and a specific hydrogen production rate of 45.29 L·kg^-1. With the increase of influent CODconcentration,the performance characteristics of the ABRchanged accordingly. When the ABRreached steady state again under an influent COD 8000 mg·L^-1,though some methane was still produced in the last three compartments,typical ethanol-type fermentation formed in the first three compartments while butyric acid-type fermentation was strengthened in the last compartment. In the steady stage,the average CODremoval decreased to 15.4%,while the hydrogen yield and specific hydrogen production rate by CODremoval increased to 12.85 L·d^-1 and 360.22 L·kg^-1,respectively. Though the biogas yield and the specific biogas production rate of the activated sludge in the ABR reached 61.54 L·d^-1 and 232 L·kg^-1·d^-1 respectively,in terms of mixed liquor volatile suspended solids (MLVSS),the hydrogen yield and the specific hydrogen production rate were only 12.85 L·d^-1 and 48 L·kg^-1·d^-1 accordingly,resulting in hydrogen consumption by methanogenesis and homoacetogenesis.

• Key words：anaerobic baffled reactor (ABR)  organic wastewater  fermentation  hydrogen yield

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