Removal of Turbidity and Sludge Production from Industrial Process Wastewater Treatment by a Rejection of Steel Rich in FeCl3 (SIWW)

Abstract

The pollution of industrial wastewater in Morocco poses serious problems for the environment. These effluents must be treated before discharge into the receiving environment. In this work, industrial steel wastewater (SIWW), rich in FeCl3 30%, was used as a useful and profitable coagulant and as liquid waste to be recovered in the treatment of wastewater. The coagulation-flocculation process using ferric chloride was studied using the Jar Test technique. The results obtained using FeCl3 30% (SIWW) have shown that the pH has a very significant effect on reducing turbidity for three types of polluting loads: high load, medium load. The reduction of turbidity and sludge production by FeCl3 30% (SIWW) is a function of the pollutant load of the wastewater to be treated and the pH. The higher the pollution load, the higher the optimal concentration of FeCl3 30% (SIWW). The 30% FeCl3 made it possible to remove more than 95% of the turbidity at a high load. In conclusion, industrial rejection rich in FeCl3 could be used to reduce the turbidity of industrial refinery wastewater considerably.