Study on the flocculating characterization of bioflocculant ZL 5-2;

Study on flocculation capability of bioflocculant γ-PGA;

Study on screening of bioflocculant-generating bacterium G-420 and its flocculating property;

Existent problems in current research and the main focus of bio-flocculant in the future were discussed.

Although bio-flocculants have obtained increasing attention for their security,innocuity and no secondary pollution to the environment,the high costs has restricted their industrial use.

The optimum conditions for biological flocculation are as follows: bio-flocculant dosage 5 mL,reaction temperature 30 ℃,stirring time 5 min with 120 r/min and then 35 min with 60 r/min,and wastewater pH 9.

In this paper, a review on the microbial flocculant's study and its application is presented.

The bioflocculant-producing bacteria and sieving process thereof,types of microbial flocculants,flocculation mechanism and synthesis were summarized,the application status of microbial flocculants in wastewater treatment were presented as well.

At present, microbial flocculants that have flocculating activity are generally biodegraded readily and harmless to the environment and human beings, so bio-flocculants are attracting wide interest and urgently called for.

The compound bio-flocculants-producing bacteria,named F_2-F_6,was adopted to investigate the optimum fermentation conditions using the effluent from bio-hydrogen-producing reactor as culture substrate.