Evaluation of Water Flow Rate Induced by an Aerator for Wastewater Treatment

Abstract

Liquid circulation flow rate driven by a high-speed air injection type aerator for wastewater treatment was evaluated using an airlift pump model. First, the evaluation for the small airlift pump experiment was conducted. By including the pressure loss at the inlet part in the momentum balance equation, the prediction error of the liquid flow rate was reduced from 22％ to 5％. For the aerator experiment, the prediction error of the liquid flow rate was less than 35％ after considering the pressure loss at the obstacle and outlet. The efficiency of the aerator decreased with increasing airflow rate. The maximum efficiency was 0.83 for the present experiment.