两相厌氧反应器相分离实验研究
Experimental study on phase separation of two-phase anaerobic reactor
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摘要: 在两相上流式厌氧生物反应器（UASB）动力学启动成功的条件下,选用钼酸盐作为产甲烷菌抑制剂,进行进一步的分相实验。实验前3 d在产酸相反应器进水中投加2.0 mmol/L的钼酸钠溶液,出水不进入产甲烷反应器。然后停止投加钼酸钠溶液,再运行3 d,出水依然不进入产甲烷反应器。6 d后,产酸反应器出水开始进入产甲烷反应器。结果表明：在停止投加钼酸盐后产酸菌便迅速恢复，而钼酸盐对产甲烷菌的作用是杀灭性的；产酸相出水去除效果降低，但是其酸化率由50%左右上升并最终稳定在60%左右,同时两相厌氧反应器整体去除效率提高。Abstract: Under the conditions of the two-phase up-flow anaerobic sludge bed（UASB）reactor’s successfully dynamic start-up, molybdate was taken as methanogens inhibitor to carry out the further-phase-separation experiment. Sodium molybdate solution was added to the influent of acidogenic reactor at the first three days of the experiment, which concentration was 2.0 mmol/L. Effluent of acidogenic reactor did not flow into methanogenic reactor.Then the acidogenic reactor ran another three days without adding sodium molybdate solution ,while the effluent still did not flow into methanogenic reactor. After six days, effluent of acidogenic reactor started to flow into methanogenic reactor. The final experimental results show that the acid-producing bacteria would quickly recover on the conditions of stopping dosing molybdate (MoO2-4) and the methanogens is killed by MoO2-4.COD removal efficiency in effluent of the acidogenic reactor decreases， but its acidification rate increases by about 50% and eventually stabilizes at about 60%.In addition, the total COD removal efficiency raises.
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Key words:
- two-phase anaerobic digestion /
- phase separation /
- molybdate /
- acidification rate
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