Abstract
This study focused on the use of jet aeration to treat printing and dyeing wastewater. The related environmental factors
influencing the dynamical efficiency of a jet aerator were investigated. Results showed that an ideal linear relation existed
between dynamical efficiency and working pressure (R2 > 0.98), with dynamical efficiency decreasing gradually as the working
pressure increased. When the gas–liquid ratio was approximately 0.6:1 to 1.4:1, more bubbles were formed by the gas–liquid
mixture in the jet aerator. Dynamical frequency increased steadily when gas–liquid was mixed uniformly and the injection depth
was deeper than 6 m. The treatment performed with the hydraulic retention time (HRT) lasted 3 h, and the dissolved oxygen was
maintained above 3 mg/L.