Anionic polymer compound bioflocculant as a coagulant aid with aluminum sulfate and titanium tetrachloride

► DOC removal was apparently improved by CBF for both TiCl4 and Al2(SO4)3. ► CBF enhanced the recoverability of flocs formed by both TiCl4 and Al2(SO4)3. ► The flocs formed by TiCl4 showed weaker recovery ability than those by Al2(SO4)3. ► CBF showed different effect on floc structure for TiCl4 and Al2(SO4)3.