用单位底物降解速率常数评价厌氧生物反应器的启动性能

采用人工配制蔗糖废水对设计的复合UASB反应器运行性能进行了实验研究,经过6个阶段55 d的启动过程,反应器进水容积负荷从2.09 kg COD/(m3.d)提高到28.02 kg COD/(m3.d),COD去除率达到98.45%。为描述反应器启动过程各阶段运行性能变化,提出了单位底物降解速率常数K2’值评价法。结果表明,复合UASB反应器在第5阶段达到了最佳运行工况。用K2’评价法对一些文献报道的厌氧反应器启动过程的实验数据进行了计算,对运行性能进行了对比评价。

Evaluation of start-up performance of anaerobic bioreactors with unit substrate degradation rate constant

Performance of a designed integrated UASB reactor was tested by treating synthetic sucrose wastewater. The start-up of the reactor went through 6 stages in 55 d.The volume-loading rate (VLR) of reactor was increased step by step from 2.09 kg COD/(m~3 · d) to 28.02 kg COD/(m~3 · d),and COD removal rate was up to 98.45% in the end. An evaluation method using K'_2, for instance unit substrate degradation rate constant,was proposed to indicate the variance of performance of the reactor in the different stages during the start-up process.The test data indicated that an optimum performance reached in the integrated UASB reactor at the 5th stage. The K'_2 values of some test data about the start-up of anaerobic reactors reported in other papers were also calculated and then the performances were compared and evaluated.