上流式厌氧污泥床处理味精生产尾母液废水影响因素的研究

Study on the influence factors of monosodium glutamate wastewater treatment by UASB

采用连续流上流式厌氧污泥床(UASB)工艺处理高浓度味精生产尾母液废水。分析了COD容积负荷、pH、挥发性脂肪酸(VFAs)、氨氮、碱度与COD去除率之间的关系。结果表明:(1)UASB反应器处理高浓度味精生产尾母液废水成功实现了污泥颗粒化;(2)当UASB反应器具有足够的pH缓冲能力时,即使在酸性进水条件下,UASB反应器依然能稳定运行,无需配置pH调节单元;(3)在UASB反应器运行初始阶段,应逐步提高COD容积负荷,起始阶段COD容积负荷太高易引起VFAs积累;(4)当出水氨氮浓度提高时,出水pH也随之上升;(5)高浓度氨氮虽然对微生物有一定的毒害作用,但产甲烷菌能够对氨氮的轻微毒性逐渐驯化而适应,系统能在高氨氮环境下稳定运行;(6)提高系统pH缓冲能力,对避免由于VFAs积累而导致的系统pH下降、进而导致COD去除率下降是非常重要的。

Upflow anaerobic sludge bed （UASB） process was employed to treat high concentrate monosodium glutamate production wastewater.The operating results of UASB reactors during each experimental run were displayed and the effects of COD volumetric loading,pH,NH3-N,volatile fatty acids （VFAs） and alkalinity on UASB performance were investigated.Results showed that UASB presented high efficiency of COD removal.The effluent NH3-N concentration could reach the highest of 2 852.0 mg/L,and it was positive correlated with effluent pH.High organic loading in start-up process would cause the accumulation of VFAs,and effluent pH was negative correlated with effluent VFAs.UASB with high acid-base buffering capacity could fit the directly injection of acidic organic wastewater without adjusting pH.