Abstract
Humic acid can be produced by a Bacillus megaterium strain, AS019, using vinasse (sugarcane mill wastewater) at an optimal concentration of 12 °Bx. Using single factor and orthogonal experiments, the optimal culture conditions were determined: optimum inoculum size, 15%; initial pH, 6.0; culture time, 8 days; rotation speed, 180 rpm; and temperature, 28 °C. Under the optimal conditions, the humic acid production rate for the strain was 49.50 g/L. The results of characterization and infrared spectral analysis revealed that the produced humic acid contained a variety of reactive functional groups.
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