| UASB系统低 pH运行时对产氢性能的分析 |
| 摘要点击 2566 全文点击 1433 投稿时间：2013-03-18 修订日期：2013-05-29 |
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| 中文关键词 UASB 乙醇型发酵 生物制氢 pH 产氢速率 |
| 英文关键词 UASB ethanol-type fermentation hydrogen production pH hydrogen production rate |
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| 中文摘要 |
| 采用升流式厌氧污泥床(UASB)作为反应装置,以红糖水为发酵底物,污水处理厂剩余污泥为反应的启动污泥,加入活性炭固定污泥成颗粒状,形成稳定的乙醇型发酵后,对生物制氢系统在低pH运行时的产氢性能进行了研究. 结果表明,在进水COD浓度为4000 mg·L-1、温度为(35±1)℃、水力停留时间(HRT)为8 h的条件下,投加NaHCO3将出水pH由稳定期的3.72分别提高至3.80、3.85、3.94、4.04,稳定时的产氢速率由5.5 L·d-1提高到约7.0、8.0、9.5、6.0 L·d-1,较稳定期分别提高了27.27%、45.45%、72.73%、9.09%. pH为3.94时,产气速率也达到最大值15.83 L·d-1,是稳定期产气量的1.75倍,产氢效率为58.05%,产气产氢效果最佳,突破了发酵法制氢pH的下限值4.0. |
| 英文摘要 |
| This experiment used upflow anaerobic sludge blanket (UASB) with brown sugar water as fermentation substrate and sewage sludge as the initiation sludge of the reaction, which was made into granular sludge by adding activated carbon. Emphasis was placed on assessing the hydrogen production performance of the UASB hydrogen bio-production system in the stable ethanol-type fermentation. Under the conditions that the influent COD was 4000 mg·L-1, the temperature was (35±1)℃ and the hydraulic retention time (HRT) was 8 h, a certain amount of NaHCO3 was added to adjust pH from 3.72 to 3.80,3.85,3.94 and 4.04,the hydrogen production rate increased correspondingly from the initial 5.5 L·d-1 to about 7.0, 8.0, 9.5 and 6.0 L·d-1, which was improved by 27.27%,45.45%,72.73% and 9.09%, respectively. The highest hydrogen production rate and gas yield were observed at pH 3.94. The maximal gas yield was 15.83 L·d-1, which was 1.75 times as high as the initial production. Meanwhile, the hydrogen production efficiency was 58.05%. This study broke through the lower limit pH value 4.0 in fermentative hydrogen production. |
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