Fermentation Conditions Optimization of P. phragmitetus and Joint Treatment of Activated Dyes Wastewater with Microbial Flocculants and Dicyandiamide-formaldehyde Resin

The comparative study of growth characteristics of P. phragmitetus cultured in LB medium has found that the flocculating activity accumulation is parallel with cell concentrations and P. phragmitetus prefers to grow and produce flocculants in alkaline culture of pH 7.5. Based on Czapek medium,it finds that the optimum carbon source,nitrogen source are glucose,peptone,with C∶N as 4∶1. The crude microbial flocculants and dicyandiamide-formaldehyde resin are used to the joint treatment for the simulating wastewater of activated dyes. Result shows that when the dosages of microbial flocculants and dicyandiamide-formaldehyde resin are 40 μg/mL and 100 μg/mL respectively,the decolorization rate is beyond 90%. Compared with traditional treatment with chemical reagents,the joint treating technique needs less decolorant and flocculants in practice.