Abstract: The authors deal with the optimization for culture condition on compound bioflocculant producing bacterium by experimentations through the study of decreasing for composition of culture medium, influence of source to C and N, content of culture medium’s composition and exoteric condition at culture time. The results indicated that the optimal components of the culture were glucose 2.0 g, K₂HPO₄·3H₂O 5.0 g,KH₂PO₄ 1.0 g,MgSO₄·7H₂O 0.20 g,（NH₄）₂SO₄·7H₂O 0.20 g,distilled water 1 L and the initial pH of the culture is 7. The external conditions of the culture medium were as follows: the sterilization pressure is 0.06 MPa, the temperature was 20-30 ℃ and the rotation speed of surge was 100-140 r/min. It reduced transform cost of compound bioflocculant and enhanced of the flocculating capability.

Key words: compound, bioflocculant producing bacterium, optimized on culture condition