低温UASB反应器内挥发酸升高的原因与控制措施

Cause and Controlling Measure of the Density-Rising of VFA in UASB Reactor at Low Temperature

目的分析低温条件下UASB厌氧反应器内挥发酸居高不下的原因和掌握降低挥发酸的有效措施.方法采用动态小试试验,处理高质量浓度的COD(约4000mg/L)有机废水,分析挥发酸累积的原因.结果在低温下控制适当的进水碱度、微量金属元素、回流比、有机负荷,即能使出水挥发性脂肪酸(VFA)质量浓度低于400mg/L,不致产生挥发酸的积累.结论低温下UASB反应器内挥发酸质量浓度可以得到有效地控制,反应器能稳定高效地运行.

This paper analyzes the cause of the density-rising of VFA in Up-flow Anaerobic Sludge Bed reactor at room temperature condition（7～25℃）and workes out the effective measure to decrease the density of VFA.Dynamic small-scale experiment was applied to process high concentration organic wastewater（the mass concentration of COD is about 4000mg/L）.The results of this test show that,under low temperature condition,so long as the experiment controls the appropriate influent alkalinity,micro metal element,rate of backflow and organic loading rate,the effluent water mass concentration of VFA could be lower than 400 mg/L,without any VFA accumulation.