Flocculating properties of the novel bioflocculant Poly(y-glutamic acid) and its use in jean dyeing wastewater treatment

摘要

We studied a novel bioflocculant poly(γ-glutamic acid)(PGA). With the addition of 4mg/L PGA (Mw=9xl05Da)and 12 Mm CaCl2, the optimal temperature for flocculation performance of PGA in the kaolin suspension was about 30°C, giving the highest flocculating activity of 98%, respectively. Studies of the flocculating properties revealed that it was stable at 30-90°C and pH 7-11. With treatment of jean dyeing wastewater flocculation, PGA showed that the color, COD, NH3-N, alkalinity and hardness removal ratios were 90%, 91.7%, 73.3%, 65 % and86 %, respectively. Bioflocculant PGA may find possible application as an alternative for textile dyeing industry and environmental bioremediation.