Coagulation experiments were performed to
find out the optimum coagulant and alkaline chemical for
the removal of humic acid (HA) from environmental water. This research clearly indicates the
effectiveness of coagulation method using polyaluminum chloride (PAC) with calcium carbonate as
neutralizer and coagulant aid to remove HA. The removal of HA was evaluated from absorbance at 260 nm
and concentration of dissolved organic carbon (DOC)