通过在实验室内建立同时硝化反硝化(SND)装置,考察了供氧速率对SND脱氮的影响。结果显示,当供氧速率由50 m L/(min·L)提高至100 m L/(min·L)时,COD与NH3-N去除效率变化不大,分别保持在96%与99%以上,而TN去除率由80%降低至70%...通过在实验室内建立同时硝化反硝化(SND)装置,考察了供氧速率对SND脱氮的影响。结果显示,当供氧速率由50 m L/(min·L)提高至100 m L/(min·L)时,COD与NH3-N去除效率变化不大,分别保持在96%与99%以上,而TN去除率由80%降低至70%左右。为研究造成脱氮性能差异的原因,采用批次试验测试了不同供氧速率下的脱氮过程。研究结果表明,供氧速率的增加不影响反硝化速率,但会提高碳氧化速率,从而加快有机物的消耗,缩短了反硝化的时间,从而造成TN去除率下降。展开更多
Based on heat and mass transfer characteristics of spontaneous combustion of coal,Arrhenius equation and the Ranz-Marshall correlation,a novel approach was proposed in this paper to estimate oxygen consumption rate of...Based on heat and mass transfer characteristics of spontaneous combustion of coal,Arrhenius equation and the Ranz-Marshall correlation,a novel approach was proposed in this paper to estimate oxygen consumption rate of self-ignition of coal at high temperature.Compared with the conventional methods,this approach involves not only kinetic properties of self-ignition of coal and temperature,but also the ambient air flow characteristics and diameter of coal particle.To testify the proposed approach,oxygen consumption rates at high temperature were measured by the programmable isothermal oven experiments.Comparisons between experimental and theoretical results indicate that the rates of oxygen depletion calculated by the proposed approach agree well with those measured from laboratory-scale experiments,which further validates the proposed approach.展开更多
文摘通过在实验室内建立同时硝化反硝化(SND)装置,考察了供氧速率对SND脱氮的影响。结果显示,当供氧速率由50 m L/(min·L)提高至100 m L/(min·L)时,COD与NH3-N去除效率变化不大,分别保持在96%与99%以上,而TN去除率由80%降低至70%左右。为研究造成脱氮性能差异的原因,采用批次试验测试了不同供氧速率下的脱氮过程。研究结果表明,供氧速率的增加不影响反硝化速率,但会提高碳氧化速率,从而加快有机物的消耗,缩短了反硝化的时间,从而造成TN去除率下降。
基金Project(51534008) supported by the National Natural Science Foundation of China
文摘Based on heat and mass transfer characteristics of spontaneous combustion of coal,Arrhenius equation and the Ranz-Marshall correlation,a novel approach was proposed in this paper to estimate oxygen consumption rate of self-ignition of coal at high temperature.Compared with the conventional methods,this approach involves not only kinetic properties of self-ignition of coal and temperature,but also the ambient air flow characteristics and diameter of coal particle.To testify the proposed approach,oxygen consumption rates at high temperature were measured by the programmable isothermal oven experiments.Comparisons between experimental and theoretical results indicate that the rates of oxygen depletion calculated by the proposed approach agree well with those measured from laboratory-scale experiments,which further validates the proposed approach.
