厌氧颗粒污泥反应器对丙酸和丁酸冲击负荷变化的响应研究
Response of propionate and butyrate loading changes in anaerobic granular sludge reactors
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摘要: 采用升流式厌氧污泥床（UASB）反应器，对增大进水浓度和增大进水流量过程中，颗粒污泥对丙酸和丁酸冲击负荷变化响应进行了研究。实验表明，进水浓度从2 000 mg COD/L提高到5 000 mg COD/L，丙酸去除率骤降，而丁酸降解相对稳定；在保持进水浓度为3 000 mg COD/L的条件下，增大进水流量，负荷从7.5 kg COD/(m3·d)升高到15 kg COD/(m3·d)时，丙酸降解率骤降，丁酸降解率仍然相对稳定。实验结果符合降解热力学理论和传统抑制动力学的未解离挥发性脂肪酸理论，并发现改变反应器运行条件能够加剧未解离酸的抑制作用。同时提出了探讨厌氧过程中丙酸积累导致厌氧反应器运行失败的基础理论原因。Abstract: The responses of anaerobic granular sludge to load changes by increasing influent concentration and inflow were studied in the up-flow anaerobic sludge blanket (UASB) reactor. The results showed that the degradation of propionate was lower than butyrate when the COD concentration was changed from 2 000 mg COD/L to 5 000 mg COD/L and when the water inflow was increased to change the OLR from 7.5 kg COD/（m3?d） to 15 kg COD/（m3?d）. The results were consistent with the thermodynamic theory， and the undissociated VFA theory mentioned in inhibition kinetic， which showed that other factors such as the reactor’s construction and operation could aggravate the inhibition. It can provide some references for further discussing the anaerobic reactors failed with propionate accumulation.
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Key words:
- propionate /
- butyrate /
- acidification /
- undissociated VFAs /
- granular sludge
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