VALORISATION D’UN REJET INDUSTRIEL RICHE EN CHLORURE FERRIQUE : APPLICATION AUX TRAITEMENTS DES EAUX RESIDUAIRES

Abstract

Intense coloring due to the presence of the non biodegradable dyes, often toxic, in industrial wastewater, enormously poses problems of degradation of the receiving medium (i.e. surface waters). This study relates to the control of pollution of the industrial wastewater with physicochemical treatment by using an industrial waste rich in ferric chloride like original coagulant. This was tested for the control of pollution of the liquid effluents from the textile industry strongly polluted with organic matter. Several parameters were selected to control the purification of our effluents: turbidity, chemical oxygen demand (COD), and volume of sludge. The optimal concentration of the coagulant used in this treatment varies from one waste to another, according to the polluting load to treat. The output of this physicochemical treatment shows an important reduction of the polluting load of textile wastewaters: 91 – 87% of the organic matter and 84 – 85% of suspended solids, with less sludge production.

Keywords

• physicochemical treatment
• Coagulant
• textile wastewater
• Turbidity
• COD
• sludge volume