厌氧颗粒污泥膨胀床处理酵母废水及微生物相研究

Performance and microbial phase in an expanded granular sludge bed reactor for treating yeast effluent

研究了厌氧颗粒污泥膨胀床(EGSB)反应器处理高浓度酵母废水的启动规律及微生物相.研究表明:在上升流速为6 m/h,温度控制在30℃,进水CODcr和FeCl2分别为20 g/L和500 mg/L的条件下,反应器COD容积负荷可达15.9 kg/(m3.d)左右,容积产气率稳定在5.2～5.5 L/(L.d)以上,COD去除率为65%～69%,容积负荷与产气率呈显著线性关系.当负荷超过15.9 kg/(m3d.)时,反应器中的挥发性脂肪酸(VFA)浓度达到了1.26 g/L,最大产甲烷活性只有0.24 g/(g.d),对产甲烷菌活性产生了明显的抑制作用.颗粒污泥微生态系统的结构和功能较稳定,球菌和短杆菌成片地聚集生长.

Start-up laws and microbe for an anaerobic expanded granular sludge bed （EGSB） reactor were investigated, to treat high strength yeast wastewater. Experiment was done under operational condition： a total superficial upflow velocity（Vup） of 6 m/h; temperature of 30 ℃, COD and FeCl2 concentration of about 20 g/L and 500 mg/L, respectively. The results were as follows： The volumetric organic loading （BV.TCOD） of the EGSB reactor reached 15.9 kg/（m^3 · d）, Methane production rate could reach 5.2 - 5.5 L/（L · d）, and COD removal efficiency of 65% - 69% could be obtained. A marked linear relationship between the volumetric organic loading and methane production rate was obtained. When volumetric organic loading exceeded 15.9 kg/（m^3 · d）, high strength VFA of 1.26 g/L inhibited the activity of methanogenic bacteria. The specific methanogenic activity of the sludge was about 0.24 g/（g · d）. Structure and function of ecosystem to granular sludge was steady, and Methanobacterium and Sarcina-type bacteria congregated developed. These findings indicate that the anaerobic treatment of yeast effluent in an EGSB system appears to be a feasible option.