SURYANI., AMBARSARI L, ARTIKA IM, SUSANTI HE. 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 AlCl3 as cation was the most effective and had important role in flocculation activity. Based on the morphological properties, LT-5 isolate was identified as Chromobacterium violaceum and LT-6 isolate was identified as Citrobacter koseri.. HAYATI J Biosci [Internet]. 2012Jan.25 [cited 2024May8];18(4):193. Available from: https://journal.ipb.ac.id/index.php/hayati/article/view/%20%3Cstrong%3E%3Cspan%20style%3D%22font-size%3A9pt%3Bline-height%3A115%25%3B%22%3EBioflocculant%20producing-bacteria%20from%20tapioca%20waste%20water%20were%20characterized.%20Two%20bacterial%20isolates%20i.e.%20LT-5%20and%20LT-6%20isolates%20had%20high%20flocculation%20activity%2C%20with%20activity%20of%2068.92%20and%2071.38%25%20respectively.%20The%20flocculation%20activity%20of%20LT-5%20isolate%20increased%20at%20pH%202.0-4.0%20%28acidic%20condition%29%2C%20however%20the%20activity%20of%20LT-6%20increased%20at%20pH%206.0-8.0%20%28neutral%29.%20Addition%20of%200.05%25%20of%20AlCl%3C%2Fspan%3E%3Cspan%20style%3D%22font-size%3A5pt%3Bline-height%3A115%25%3B%22%3E3%20%3C%2Fspan%3E%3Cspan%20style%3D%22font-size%3A9pt%3Bline-height%3A115%25%3B%22%3Eas%20cation%20was%20the%20most%20effective%20and%20had%20important%20role%20in%20flocculation%20activity.%20Based%20on%20the%20morphological%20properties%2C%20LT-5%20isolate%20was%20identified%20as%20%3Cem%3EChromobacterium%20violaceum%3C%2Fem%3E%20and%20LT-6%20isolate%20was%20identified%20as%20%3Cem%3ECitrobacter%20koseri.%3C%2Fem%3E%3C%2Fspan%3E%3C%2Fstrong%3E