Bioflocculants from hydrolysates of corn stover using isolated strain Ochrobactium ciceri W2

This study isolated a total of seven pure cultures from activated sludge that could produce bioflocculants from 1.7% v/v H2SO4 treated hydrolysates of corn stover. The most effective strain amongst the seven isolates was identified as Ochrobactrum ciceri W2. The W2 cells produced biopolymers in logarithm growth phase, peaking at 3.8 g l−1in productivity on 16 h. The yielded bioflocculant was primarily consisting of polysaccharides and proteins, and maintained its flocculating activity to 0.5% w/w kaolin suspensions over pH 1–10 (at 30 °C) and 30–100 °C (at pH 7). This study also revealed that the strain W2 could utilize biopolymers from hydrolysate of corn stover without addition of excess phosphate salts, which could largely reduce production costs of bioflocculants.

► We isolated Ochrobactrum ciceri strain that is effective to yield bioflocculants.
► Hydrolysates from acid treated corn stover were used as the substrates.
► The produced flocculants could flocculate kaolin suspension over pH 1–10 and 30–100 °C.
► The strain could produce biopolymer in phosphate salts-free hydrolysates.