活性污泥内碳源含量的估测与表征方式研究

Estimation and Characterization of Internal Carbon Content in Activated Sludge

基于内源反硝化动力学,评估不同培养条件下活性污泥的内源反硝化能力,研究间接表征污泥中内碳源含量的方法,以利于实现活性污泥内碳源的充分利用。研究结果表明,当COD由100 mg/L增至400 mg/L时,培养污泥的内源反硝化速率基本从零增至15.68 mgNO3--N/(L·h),内源反硝化能力明显增强;在试验条件下,不同污泥、不同浓度下的内源反硝化动力学均具有良好的线性度(R2>0.94),在此基础上推导得到污泥内碳源含量为2.86Kt(K为污泥的比内源反硝化速率系数,t为反应时间);根据推导公式计算的NO3--N去除率与实测值接近。利用内源反硝化动力学间接表征内碳源含量的方法具有一定的有效性和稳定性,且可操作性强,适用于指导污水处理厂的日常运行。

Based on endogenous denitrification kinetics, the endogenous denitrification capacity of activated sludge under different culture conditions was estimated. An indirect method for characterizing internal carbon content in sludge was studied to achieve full use of the carbon source in activated sludge. The results showed that when increasing COD from 100 mg/L to 400 mg/L, the endogenous denitrification rate of cultivated sludge increased from 0 to 15.68 mg NO3^- - N/（ L · h）, indicating that the endogenous denitrification capacity improved. Under the experimental condition, there was a good linear rela- tionship （ R2 〉 0.94 ） for the endogenous denitrifieation kinetics of different sludge with different concentrations. The internal carbon content in sludge （ Xend = 2.86Kt） was derived, in which K was the specific endogenous denitrification rate, and t was the reaction time. The removal rate of NO3- - N calculated according to the derived formula was close to the measured value. The indirect characterization method of internal carbon content by endogenous denitrification kinetics is effective, stable and suitable for guiding the routine operation of WWTP.