RTD对内循环三相生物流化床脱氨氮效率的影响

采用脉冲法刺激响应技术测定了不同流态条件下三相生物流化床的水力停留时间分布(RTD),得到反应器好氧流化区的串联级数近似为1,从而可用全混流反应器(CSTR)模型来研究其动力学特点,通过对比研究,得到在理论停留时间为1.5 h时,反应器的体积利用率达到最优。同时也对比了反应器在各种理论停留时间(HRT)下的脱氨氮效率,发现在水力停留时间为1.5 h时,反应器也具有最佳处理效率,氨氮的脱除率达到90%以上,从而验证了示踪试验的可靠性,并为生化反应器的设计放大与稳定运行提供了宝贵的资料。

Effects of RTD on NH4-N Removal of Inner Loop Three-Phase Biological Fluidized Bed Reactor

Hydraulic Residence Time Distributions(RTDs) in an inner loop three-phase biological fluidized bed reactor were measured under different flow regimes using pulse stimulus-response technique method.The number of tank-in-series measured was approximately 1 in aerobic area of the reactor,therefore the reactor can be seen as a Continued Stirred Tank Reactor(CSTR).By comparing different Hydraulic Retention Time(HRT),the authors found that at HRT of 1.5 h,the capacity usage reached the optimum level.Meanwhile the maximum NH_4-N removal efficiency,more than 90%,was also obtained when HRT was 1.5 h The results validates the reliability of RTD test and provides the basis of sizing and scaling up of the reactor.