Aerobic granulation for methylene blue biodegradation in a sequencing batch reactor

摘要

Aerobic granules to treat wastewater containing methylene blue (MB) were successfully developed in a sequencing batch reactor (SBR) using activated sludge as inoculum. After cultivation for 87 days, stable aerobic granules were obtained with a clearly defined shape and a diameters ranging from 2 to 4 mm. After granulation, the removal efficiencies of MB and chemical oxygen demand (COD) reached 56% and 93%, respectively. Specific MB biodegradation rates followed the Haldane model and the associated kinetic parameters were as follows: V_(max)= 184.15 mg L~(-1) h~(-1), K_5 =209.96 mg L~(-1), and K_i =21.23 mgL~(-1). The aerobic granules proved to be a feasible and effective way to degrade MB-containing wastewater.