A biopolymer flocculant produced by Pseudomonas sp. A-99 had flocculat
ing activity both in inorganic suspensions containing Ca2+, Mg2+ or Fe
3+ and in organic suspensions containing Fe2+, Fe3+ or Al3+. The flocc
ulant was an acidic protein and contained a small amount of an acidic
polysaccharide consisting of galacturonic acid, glucose and galactose.
Productivity of the flocculant was about 450 mg/l medium.