固定载体卧式厌氧反应器处理糖蜜废水的快速启动

Start-up of fixed carrier anaerobic reactor treatment to molasses wastewater

摘要:

为高效处理高浓度有机废水而设计了固定载体卧式厌氧反应器R1和R2, 它是厌氧折流板反应器(ABR)的改进, 以活性炭纤维作为生物膜载体固定并充当反应器的折流板, 在实验室规模上对R1和R2处理糖蜜废水进行快速启动运行。HRT和ORL是影响R1和R2稳定高效运行及启动的2个重要工艺参数。实验证明: HRT为2 d时, 反应器运行最佳。在第30天时, R1的COD去除率达到84.88%, R2达到81.72%。随着进水ORL由1.25 kg/(m3·d)提升到10 kg/(m3·d), 沼气容积产气率由0.35 L/(L·d)逐渐增加到4.98 L/(L·d)。进水pH值为3.9?4.5之间, 整个启动运行过程中, 未调节pH值, R1和R2的出水pH值均在6.7?7.6之间, 2个反应器均有较强的抗酸能力, R1的pH波动更为平缓。在整个实验过程中, 污泥流失量小, 没有发生堵塞现象, 在处理酸性高浓度有机废水时, 2个反应器均表现出较强的抗负荷冲击能力。

Abstract:

To efficiently treat high concentration organic wastewater, we designed fixed carrier anaerobic reactor R1 and R2. They are improvement of anaerobic baffle reactor (ABR). Its baffles were made from active carbon fiber, quick start-up of R1 and R2 is proceeded to treat molasses wastewater in a laboratory-scale. The hydraulic retention times (HRT) and organic loading rate (OLR) are important technical parameters which affect stable efficient operation and start-up of reactor. The results indicated when HRT is 2 d, reactors show the optimum operation. In the operation of 30 d, COD removal efficiency of R1 could reach the 84.88%, R2 could reach 81.72%. Biogas production rate increased from 0.35 L/(L·d) to 4.98 L/(L·d), with influent organic loading rate (OLR) raised from 1.25 kg/(m3·d) to 10 kg/(m3·d). In the two reactors, the pH value of effluent wastewater was between 6.7 to 7.6 and the pH value of influent wastewater was between 3.9 to 4.5. During the whole experimental period, the pH value of influent wastewater was not adjusted, which proved two reactors have strong ability to resist acid. The pH value of R1 fluctuated more gently. The reactors with less sludge losing and no clogging phenomenon showed the strong ability to treat acidic high concentration organic wastewater and to resist high shock loading during the whole running processes.