Możliwość minimalizacji niepożądanych skutków procesu koagulacji siarczanem glinu

The objective of the study was to investigate the potentiality of minimizing the undiserable effects concomitant with the coagulation process, such as residual aluminium and water corrosivity. The experiments involved two types of riverine water samples (from the Odra and from its tributary, the Oława) which differed in pollution level. The samples were treated with aluminium-based salts varying in basicity. The experimental results showed that residual aluminium concentration and water corrosivity depended on the kind and dose of the coagulant, as well as on the pH and temperature of the water, but primarily on the basicity of the coagulant used. The substitution of polyaluminium chlorides for alum not only decreased residual aluminium concentration and water corrosivity but also improved the efficiency of water treatment.