Evaluation of the Use of Ferric Chloride and Tannin as Coagulants in the Removal of Solids from Industrial Effluents
Efficiency in the Quality of Treated Industrial Effluents
DOI:
https://doi.org/10.5132/eec.2023.01.10Keywords:
Coagulation, Efficiency, Wastewater treatmentAbstract
The circular economy has generated a lot of interest in the industrial sector, and one of the proposed principles is the reuse of waste generated by the industry. In this sense, it is important to apply adequate treatments for their reuse, thus avoiding inappropriate disposal, in addition to bringing economic advantages to the sector. The present proposal applied the alternative coagulants ferric chloride and tannin aiming at the removal of solids from the effluent generated in the painting booth for gas containers (GLP) of the company Supergasbras, headquartered in Londrina-PR, since it uses iron sulfate . The experimental planning for the tests followed by varying two factors, sedimentation time and coagulant dosage, subdivided into 3 coded levels (+1, 0 -1), thus totaling 9 experiments in duplicate. After the experiment, analyzes of the pH, apparent color, turbidity and COD indicators were carried out. Ferric chloride proved to be extremely efficient for removing turbidity and chemical oxygen demand, with values exceeding 90% removal, in addition, the apparent color indicator also obtained a good result. However, in relation to the pH, all the tests with ferric chloride acquired an acid character, consequently it is necessary to use lime to correct the acidity. The application of the tannin organic coagulant, in turn, provided excellent efficiency in removing apparent color and turbidity, in addition to obtaining adequate pH values that comply with current legislation. Regarding the removal of the chemical demand for oxygen, it is approximately 90% for all tests using tannin as a coagulant.
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