Efficiency of pressurized biofilm reactor for treatment of pickled mustard tuber wastewater

A pressurized biofilm reactor was developed by combining pressurization, jet aeration and biofilm technologies, and the influence of organic load, pressure and air supply rate on the treatment efficiency of pickled mustard tuber wastewater was investigated. The results show that under the conditions of water temperature of (30 ± 5) °C, pressure of 0.2 Mpa, organic load of 16 kgCOD/ (m³·d), phosphate load of 160 gPO₄^3--P/(m³·d), DO of 5 mg/L, air supply rate of 300 L/h and no sludge discharge, the removal rates of COD and phosphate are 94.6% and 54.3% respectively. Compared with the normal pressure reactor, the removal efficiency of COD is increased by 25 times with biological reduction of phosphate for phosphorus removal. The optimal pressure and air supply are 0.14 MPa and 300 L/h respectively.