Generally, coagulation-flocculation can’t treat the heavy metal wastewater completely (Chang and Wang, 2007). Therefore, coagulation-flocculation must be followed by other treatment techniques. Plattes et al. (2007) employed precipitation, coagulation and flocculation processes using ferric chloride to remove tungsten from industrial wastewater. Tungsten removal was found to be most efficient (98-99%) in acidic conditions (pH < 6). Bojic et al. (2009) explored spontaneous reduction-coagulation process using micro-alloyed aluminium composite in a laboratory semi- flow system to treat model heavy metal wastewater. The residual concentrations of metals were at admissible levels after only 20 min of treatment.