Flocculating Properties of the Novel Bioﬂocculant Poly(γ-Glutamic Acid) and its Use in Jean Dyeing Wastewater Treatment
We studied a novel bioﬂocculant poly(γ-glutamic acid) (PGA). With the addition of 4mg/L PGA (Mw=9×105Da) 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 % and 86 %, respectively. Bioﬂocculant PGA may ﬁnd possible application as an alternative for textile dyeing industry and environmental bioremediation.
Yanguo Shi and Jinlong Zuo
G. Yang et al., "Flocculating Properties of the Novel Bioﬂocculant Poly(γ-Glutamic Acid) and its Use in Jean Dyeing Wastewater Treatment", Advanced Materials Research, Vols. 183-185, pp. 125-129, 2011