The use of Al mineral salts in wastewater treatment is a well known process and most
common [1]. For a long time we have been studying the feasibility of the aluminium anodizing
waste as coagulant. In previous works, we have tested anodizing sludges in the treatment of
municipal wastewaters and of paint industry wastewater in batch processes [2]. In this study we
have tested the use of the aluminium anodizing waste as coagulant for the treatment of municipal
wastewaters in continuous processes. Different muds from nine different anodizing facilities were
collected and prepared for use as coagulant. In addition, two mud mixtures were prepared to study
the influence of the combination of different muds in the efficiency of the treatment. The tests were
made, being controlled important parameters such as pH, turbidity and chemical oxygen demand
(COD). We have verified that the coagulation process was effective for all the muds and mixtures
tested. The formation of flocs that settle rapidly was visible and the Turbidity and COD reduction
obtained has demonstrated the efficiency of the anodizing mud as coagulant. Aluminium anodizing
plants generate a large quantity of wastes that are a burden to the industry. This works regards the
reuse of anodizing sludges in wastewater treatment.
Investigation of Environmental-friendly Technology for a Paint Industry Wastewater Plant in Turkey
