低pH值下上流式厌氧污泥床反应器(UASB)以糖蜜为底物制取高纯度氢气
Production of high purity hydrogen at low pH on up-flow anaerobic sludge blanket (UASB) with molasses as substrate
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摘要: 采用由有机玻璃制成的上流式厌氧污泥床反应器(UASB),以糖蜜废水为发酵底物,投加适量氯化铵和磷酸二氢钾,研究在低pH值下系统的产氢性能.在系统启动初期,投加碳酸氢钠控制进水pH=6.75—7.15,使系统处于中性厌氧发酵,固定进水COD为4000 mg·L-1,HRT=8 h.系统运行20 d后,系统处于混合型发酵类型,随后停止投加碳酸氢钠.系统经过45 d的运行,乙醇和乙酸浓度占总浓度的79.39%,而丙酸的浓度只占总浓度的10.89%,形成了稳定的典型乙醇型发酵.第65天,乙醇和乙酸的浓度分别为840.56 mg·L-1、403.12 mg·L-1,乙醇与乙酸浓度占总浓度的93.2%,氢气含量为86.97%.在出水pH=2.81时,系统产氢性能最佳.氢气产率为2.079 mmol·L-1·h-1,氢气产量1.12 m3·m-3·d-1,氢气含量91.46%,是稳定期氢气含量的1.65倍.
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关键词:
- 上流式厌氧污泥床反应器(UASB) /
- pH /
- 乙醇型发酵 /
- 生物制氢 /
- 糖蜜
Abstract: This research studied the hydrogen production performance at low pH by adopting the up-flow anaerobic sludge blanket (UASB) made of organic glass, using molasses wastewater as fermentation substrate and adding appropriate amount of ammonium chloride and potassium dihydrogen phosphate. In the initial startup of this system, sodium bicarbonate was added to control the water pH in the range of 6.75—7.15 which enabled the system to be in a neutral anaerobic fermentation with the fixed influent COD of 4000 mg·L-1 and HRT=8 h. Twenty days after the operation, the reaction was in a mixed-type fermentation, and sodium bicarbonate addition was stopped. Forty-five days after operation, the concentration of ethanol and acetic acid accounted for 79.39% of the total, while the propionic acid concentration only accounted for 10.89%. The system formed the stable typical ethanol-type fermentation. On the sixty-fifth day, the concentration of ethanol and acetic acid was 840.56 mg·L-1 and 403.12 mg·L-1 respectively, which accounted for 93.2% of the total concentration with hydrogen content of 86.97%. When the enfluent pH reached 2.81, the hydrogen production was the highest with a hydrogen production rate of 2.079 mmol·L-1·h-1, hydrogen production volume of 1.12 m3·m-3·d-1, and biogas hydrogen content of 91.46%, which was 1.65 times of the content in the stable phase. -
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