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Abstract Compound bioflocculant was produced from rice straws as carbon sources through two-step fermentation: rice straws were degraded by cellulose degradation bacterium HIT-3; flocculating bacterium F2-F6 produced bioflocculant from straws saccharifying liquid.The output was quantitatively analyzed. After NaOH-pretreated,the reduced suger yield of rice straws achieved to 10.6%, cellulase activity reached to maximum 0.13U/mL, TOC in fermentation liquid gradually increased while TN gradually decreased, rice straws were well degraded. Flocculation rate of bioflocculants by using rice straws as carbon sources was 90%. Feeding nitrogen source could improve efficiency of flocculation and reduce the fermentation time. Flocculation rate of bioflocculants reached to 95%. The production of compound bioflocculant was 44kg.
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Received: 01 July 2008
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