【作者】 方佩珍；

【导师】 潘永亮；

【作者基本信息】 四川大学 ， 化工过程机械， 2003， 硕士

【摘要】 本文研究了以高分子（聚丙烯酸酯类）载体为固相的三相循环流化床的部分流动特性；并完成了用此反应器处理垃圾渗滤液厌氧段出水的好氧消化及NH₃—N去除试验。 三相循环流化床的流动特性试验结果表明，以高分子载体作为固相的三相循环流化床的流化效果好，其最小流化速度与颗粒起始输送速度较其它载体低得多，流化床的操作能量消耗较低；提升管内固体颗粒含量的多少对气含率的影响很小，在保持一定气含率下，可有效提高固含率，在生化过程中即可增加微生物浓度，从而提高设备的处理能力；在一定固相浓度下，可适当提高气含率，来提高设备处理效率；在生化过程中，循环过程还有利于载体表面生物膜的更新。 用三相循环流化床处理垃圾渗滤液厌氧段出水试验结果表明，该流化床不仅具有较好的好氧消化能力，同时还具有良好的硝化-反硝化（SND）功能。在全部以厌氧段出水为进水并达到稳定时，在总的平均水力停留时为5小左右的情况下，进水COD平均浓度为1377.3mg／L，出水COD平均浓度为248mg／L，平均去除率为82％；进水NH₃—N平均浓度为217.5mg／L，出水NH₃—N平均浓度为50.1mg／L，平均去除率为77％。 处理过程所表现出的良好去除效果、低能耗、较强的抗冲击负荷能力及操作控制方便等优点，表明了采用多孔高分子载体的三相循环流化床处理低浓度垃圾渗滤液是完全可行的。更多还原

【Abstract】 Some flow characteristics of the fluid in the three-phase circulating fluidized bed with polymer porous carriers are studied in this thesis. And a test of aerobic digestion and NH3 - N removal of the landfill leachate, which has been treated by anaerobic digestion, was fulfilled in this fluidized bed reactor.The results, which is from the test of the flow characteristics of the fluid in the three-phase circulating fluidized bed , show that the flow efficiency of the fluid in this circulating fluidized bed with polymer porous carriers is excellent, and its minimum fluidization velocity and transport velocity are more small compared with some other carriers, so the energy-dissipating in the operation of the reactor is very low. Solids content in the riser has little influence on gas holdup, and solids holdup can be raised effectively with a certain gas holdup, so the treatment ability of reactor can be improved by high microorganism concentration in some biochemical process. Gas holdup can be increased suitably with a certain solid concentration to enhance the efficiency of the reactor. Circulating process is beneficial for the renewal of biofilm.The results of the test of landfill leachate treatment demonstrate that, this circulating fluidized bed not has high aerobic digestion but has well ability of simultaneous nitrification and denitrificatim(SND). When the wastewater is all from the landfill leachate, which has been treated by anerobic digestion, and its concentration reaches to stableness , with the total HRT of 5h, average influent COD and NH3-N are respectively 1377.3mg/l and 217.5mg/l, average effluent CODand NH3 - N are 248mg/I and 50.1mg/I, and the average removal rates of COD and NH3 -N are 82% and 77%. This fluidized bed reactor has excellent treatment efficiency, low energy-dissipating, powerful capacity change-resist and convenient operation.All the results indicated that the treatment of low concentration organic wastewater in three-phase circulating biological fluidized bed with polymer porous carriers is feasible.更多还原