Isolation of microorganism producing flocculant and its culture conditions = 응집제 생산 미생물의 분리 및 배양조건

Abstract

A fungal strain, designated Aspergillus sp. JS -42, was isolated and shown to produce an extracellular polysaccharide used as a biofiocculant. The optimal medium composition for the production of flocculant with Aspergillus sp. JS- 42 was glucose 3.0%, yeast extract 0.2%, (NH4)jSO; 0.1 %, and CaCI. O.Ofj% in distilled water. The optimum culture temperature and optimuni cult.ure pH for the production of 'lie floccukmt were 25°C and pH 7.(), respectively. The highest production of flocculant was obsei'ved 90 hours of cultivation at the optimal condition. The flocculant could efficiently flocculated the tesied solids suspended in aqueous solution and was stable at high temperature( 100"C) and to pH range of from 2 to 10. The flocculant seems to be a kind of high viscous polysaccharide.