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Title 

Production and rheological properties of bioflocculant produced by Bacillus sp. DP-152

Authors 

Hyun Hyo SuhSeong Hoon MoonHee Sik KimHyoung Kab KimGee Ill JunHyun Geoun ParkDae Ook KangHee Moak OhByung Dae Yoon

Publisher 

The Korean Society for Applied Microbiology

Issue Date 

1998

Citation 

Journal of Microbiology and Biotechnology, vol. 8, no. 6, pp. 618-624

Keywords 

Bacillus speciesbioflocculant productionrheology

Abstract 

The culture conditions for Bacillus sp. DP-152 in the flask were investigated for the production of polysaccharide flocculant, DP-152. The optimum pH and temperature for the flocculant production were 8.0 and 30°(Degree Sign)C, respectively. The favorable substrates for flocculant production were soluble starch and ammonium nitrate. The medium composition was optimized as follows: 30 g soluble starch, 0.75 g NH4NO3, 2.0 g K2HPO4, 0.1 g KH2PO4, 0.2 g MgSO4·7H2O, and 0.2 g MnSO4·4~5H2O in 11 of distilled water. Under this optimized condition, flocculating activity has been improved 4-fold compared with that of the basal medium. In the culture flask, the highest flocculating activity was obtained after 70 h of cultivation and the amount of bioflocculant DP-152 yielded was 12.4 g/1. The solution of bioflocculant DP-152 showed non-Newtonian characteristics. Bioflocculant DP-152 exhibited apparently higher viscosity at all concentrations compared to that of zooglan (from Zoogloea ramigera), and it was stable over a wide range of temperatures and pHs.

ISSN 

1017-7825

Appears in Collections

1. Journal Articles > Journal Articles

Registered Date

2017-04-19


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