活性污泥反应器流态研究中示踪剂的选择

针对活性污泥反应器中的流态研究需要，通过备选示踪剂氯化锂、亚甲蓝和氯化钠的污泥吸附试验以及曝气静沉试验，研究了活性污泥对这3种示踪剂的吸附作用，以及示踪剂浓度对污泥处理效果的影响情况。结果表明，亚甲蓝易被污泥吸附，对试验数据干扰较大，且吸附亚甲蓝后，水样中污泥对COD_Cr的处理效率下降幅度达50%以上；氯化锂和氯化钠是离子型示踪剂，本身不易被吸附，投加后的活性污泥对COD_Cr的处理效率基本不变，保持在70%以上。从示踪剂投加量以及出水水质控制方面考虑，确定氯化锂为3种示踪剂中的最佳示踪剂。

Tracer Selection of Activated Sludge Reactor Flow Studies

To find the suitable tracers for activated sludge reactor flow pattern studies, the sludge adsorption experiment and aeration static settling experiment were performed with three alternative tracers, i.e. methylene blue, lithium chloride and sodium chloride. The adsorption effect of activated sludge on the 3 tracers and the impacts of tracer concentration on the activated sludge treatment efficiency were studied. The results showed that methylene blue was easily adsorbed by the sludge, leaving great influence on the experimental data, and the CODCr treatment efficiency by the sludge was reduced by up to 50% after adsorption of methylene blue. Lithium chloride and sodium chloride are ion-tracers which are difficult to be adsorbed; they will not affect the effect of activated sludge treatment. The treatment efficiency of CODCr remained at more than 70%. Finally, considering the tracer dosage and the effluent quality control, lithium chloride was identified as the most suitable tracer among the 3 alternatives.