Screening of Flocculants-producing Strains and Study on Flocculating Activity
Luo Ping · 2004
Two flocculants-producing strains of high flocculating activity were screened from the soil by the method of enrichment-isolation-screening.The growth of the strains, flocculating activity and pH at different time during the culture of the strains was studied and four different kinds of media were selected to culture the microorganisms.It is found that zapek medium is one to achieve the highest production rate at a low cost under the optimum conditions: pH values within 7 to 9, culture temperature 30℃ and cultivation for 72 h.It is indicated that the suitable pH value for the microbial flocculants to flocculate Kaolin clay suspension is higher than 7 and the flocculation ratio is up to 94.6% with the synergy of Ca~(2+)、 Mg~(2+) and Al~(3+).