s:The bactrium producing bio-flocculant with hihg flocculatiing activity was sereened from soil. The bacterium was identified as Bacillus mucilgnons n. var. The flocculant MBRA9 produced by the bacteria had characteristics of lower dosage, better flocculating effect, etc. When the Kaolin suspersion of 5 000 mg/L was treated with MBRA9, the flocculation efficency was up to 99.6% and the dosage was 0.1 mL/L,which is only about 1/10～1/200 of that of common microbial flocculants. The animal toxicity test showed...
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