快速培养好氧颗粒污泥处理页岩气压裂返排液

FAST CULTURING OF AEROBIC GRANULAR SLUDGE TO TREAT SHALE GAS RESERVOIR FRACTURING FLOWBACK LIQUID

为高效环保的处理页岩气开发过程中产生的大量压裂返排液,在序批式反应器(SBR)中以实际页岩气压裂返排液为进水废液,CH3COONa为碳源,NH4 C1为氮源,接种上流式厌氧污泥床反应器(UASB)中厌氧颗粒污泥,在好氧曝气条件下运行.厌氧颗粒污泥通过厌氧颗粒污泥驯化、好氧颗粒污泥转化、好氧颗粒污泥成熟3个阶段完成了好氧颗粒污泥的转变,转变过程可大幅缩短至24 d.最终形成的好氧颗粒污泥形态、大小稳定,平均粒径3.6 mm,MLVSS/MLSS为0.82,SVI为30 mL/g.成熟后的好氧颗粒污泥处理页岩气压裂返排液,化学需氧量(COD)去除率稳定在70% ~80%;悬浮固体(SS)去除率稳定在85%以上;总铁去除率稳定在90%以上,表现出优良的处理效果.

In order to treat the large amount of fracturing flowback fluid produced by the development of shale gas efficiently and environment friendly,anaerobic granular sludge from Upstream Anaerobic Sludge Bed Reactor(UASB)was inoculated to an aerobic SBR,where actual flowback fluid was used as the inlet wastewater,CH3COONa was used as the carbon source and NH4 Cl was used as the nitrogen source.Anaerobic granular sludge was turned into aerobic granular sludge in 3 stages,domestication stage,transformation stage and mature stage in 24 d.Eventually the formed aerobic granular sludge had stable shape and size,particle size 3.6 mm,MLVSS/MLSSvalue 0.82,SVI30 ml/g.Using mature aerobic granular sludge to treat shale gas reservoir fracturing flowback liquid,the removal rate of COD reached 70~80%,the removal rate of SS reached above 85%and the removal rate of total iron reached above 90%.