SURYANI. , AMBARSARIL., ARTIKAI.M. and SUSANTIH.E. 2012. <strong><span style="font-size:9pt;line-height:115%;">Bioflocculant producing-bacteria from tapioca waste water were characterized. Two bacterial isolates i.e. LT-5 and LT-6 isolates had high flocculation activity, with activity of 68.92 and 71.38% respectively. The flocculation activity of LT-5 isolate increased at pH 2.0-4.0 (acidic condition), however the activity of LT-6 increased at pH 6.0-8.0 (neutral). Addition of 0.05% of AlCl</span><span style="font-size:5pt;line-height:115%;">3 </span><span style="font-size:9pt;line-height:115%;">as cation was the most effective and had important role in flocculation activity. Based on the morphological properties, LT-5 isolate was identified as <em>Chromobacterium violaceum</em> and LT-6 isolate was identified as <em>Citrobacter koseri.</em></span></strong&gt;. HAYATI Journal of Biosciences. 18, 4 (Jan. 2012), 193. DOI:https://doi.org/10.4308/hjb.18.4.193.