Research on a Sequencing Batch Three Phase Fluidized Bed Biofilm Reactor for Treatment of Sugar Factory Wastewater

Abstract

With bagasse as carriers, a sequencing batch three phase fluidized bed biofilm reactor for cane sugar wastewater treatment has been investigated. The experiments showed that, with the initial COD, NH3-N and TP concentrations of 578.9~876.8 mg/L, 39.9~55.7 mg/L, 3.61~5.60 mg/L, respectively, after the aeration time of 2~3.5 h, the effluent COD and NH3–N were lower than 120 and 10mg /L, which achieved the national primary discharge standard, and the highest removal rates of COD, NH3-N and TP reached to 97%, 91.39% and 99.21%, respectively. Considering both the treatment performance and energy consumption, the optimum air flow rate was determined as 40~80 L/h, and the favorable pH range was found to be 5~8.Bagasse, as carriers in the sequencing batch reactor, had better characteristics of the bio-film attachment and performance of wastewater treatment. Using bagasse as carriers could achieve the purposes of reducing cane sugar wastewater treat-cost and contamination of the environment.