Microbial Flocculants Flocculation Properties Research

The study aims to research the microbial flocculants flocculation strains S-3′s influence on the flocculation activity under different flocculation conditions and identify the best flocculation conditions of the microbial flocculants.The major method is respectively changing the pH value,temperature condition and volume of addition of the kaoline soliquoid and recording their absorbance values by using spectrometers.The experiment results show that flocculation active substances mainly exist in fermented liquid,microbial flocculants keep the highest activity when the pH value of the kaoline soliquoid is 8.Meanwhile,microbial flocculants are sensitive to the changing of the temperature and present great instability.With the rise of the temperature,flocculation activity of the microbial flocculants reduced to 0 and flocculation activity increase to 92.4% when 6 mL Ca2+ is added into the kaoline soliquoid.Flocculation activity increases with the improvement of the volume of flocculants in a certain range and adding 1~2 mL microbial flocculants contributes to the result that the highest rate of flocculation reaches to 93.1%.We can make the conclusion as follows.Active materials of the microbial flocculants mainly exist in the centrifugal supernatants.The flocculants system environment of the kaoline soliquoid makes a significant role in the flocculation effect of the microbial flocculants and microbial flocculants consists mainly of protein.