上流式厌氧污泥床处理造纸工业废水的研究

用上流式厌氧污泥床(UASB)处理二次纤维造纸废水,废水COD浓度达到1100mg/L,UASB水力停留时间4.43h,容积负荷COD约6.0kg/(m3·d)。观察了UASB系统启动和运行情况,通过对水温、出水挥发性有机酸(VFA)浓度、出水碱度等指标的监测,及时调整UASB反应器的运行负荷,补充N、P及微量元素,使系统保持了较高的处理效率,UASB稳定运行时可去除90%以上的COD,50%以上的总硬度,以及80%以上的硫酸根离子。经分析温度与UASB产气速率关系密切,并确定了甲烷化速率与温度的关系式。

Study on Processing Paper-making Wastewater by UASB

The wastewater from paper making with recycled fiber was treated with Up-flow Anaerobic Sludge Bed(UASB).Digestion sludge of municipal wastewater plant was used to start the UASB system.The COD of the wastewater was about 1?100?mg/L,which was close to the property of the wastewater of most paper mills using recycled fiber.The HRT of UASB reactor was about (4.43?h),which accorded with most UASB plants.During the research,the starting up and operating process of the UASB reactor were observed.The temperature of the water,the VFA and alkalinity concentration of the UASB effluent was surveyed particularly.The UASB reactor was found to keep high treatment efficiency by adjusting the load of the UASB and supplying N,P elements and some other microelements.The process removed about 90% of COD,50% of total hardness,and 80% of sulfate on average.The main factors affecting the treatment efficiency were temperature,nutriments and the sludge exposure level to substrate.Especially,the temperature had a close relationship with the methane yield rate.The relation could be given with the Arrhenius equation.