Industrial Wastewater, Recycle and Reuse, Using Hybrid Process

Industrial wastewater contains a lot of pollutants and therefore needs special treatment processes. The treatment process may contain mechanical, biological, chemical, physical and physiochemical such as Coagulation – Flocculation process. The goal of this experimental work was to investigate the effects of coagulationflocculation and dissolved air flotation as a hybrid process of industrial wastewater. A jar test is used as a first step to determine the type and dose of coagulant for this wastewater. Then the effluent of first step used to further treatment by using Dissolved Air Flotation pilot. Results of coagulation-flocculation process show that ferric chloride is more effective on turbidity and COD removal than alum and quick lime. Also in dissolved air flotation, increasing pressure in pressure tank compared to the kind of mixing air-wastewater causes to further remove of NTU and COD. Also, using both Coagulation-Flocculation and Dissolved Air Flotation (DAF) as a hybrid process can drastically reduce the impurities. For example, using ferric chloride in Coagulation process and 5 bar pressure in pressure tank causes removing turbidity and COD respectively 98% and 92%. So it can be concluded the hybrid process is very effective to recycle and reuse industrial wastewaters.