Tertiary Treatment of Sanitary Sewage from Polishing Pond Using System of Coagulation/Precipitation Followed by Ultraviolet Radiation

Victória Regina Celso Monteiro, Carlos Magno de Sousa Vidal, Jeanette Beber de Sousa, Grasiele Soares Cavallini

Abstract


In this research the process of coagulation/precipitation followed by ultraviolet disinfection was investigated for tertiary treatment of sewage from polish pond. Were done laboratory tests using jart-test to simulate coagulation and in reactor UV to simulate disinfection, varying operational conditions. The process demonstrated a good performance, had been verified moderate removal of turbidity (27%-66%), COD (22%-53%), apparent color (22%-64%), real color (22%-64%), phosphorus (31%-52%), total solids (31%-52%) and suspended solids (10%-30%). To improve the process of coagulation were realized tests with anionic and cationic polymers, and the cationic showed the best results. The dose of coagulant considered optimal was 60 mg.L-1 of ferric chloride combined with 20 mg.L-1 of polymer cationic. In the best operational configuration was obtained inactivation of 4,65 log to CT, and 4,60 log to E. coli, obtaining 62,7%  of removal for turbidity, 65,3% and 69,7% of apparent color and real color respectively, 50,3% of COD and 47,3% of suspended solids. In conclusion this process can be considered suitable for the removal of pollutants from a polish pond, but should be observed the quality of the effluent for the presence excessive of algae that can harm the treatment, making the process difficult.


Keywords


Sewage; Coagulation; Ultraviolet Disinfection.



DOI: http://dx.doi.org/10.5433/1679-0375.2013v34n1p67

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Semin., Ciênc. Exatas Tecnol.
Londrina - PR - Brazil
E-ISSN: 16790375
DOI: 10.5433/1679-0375
Email: seminaexatas@uel.br
 
This journal is licensed with a license Creative Commons Attribution-NonCommercial 4.0 International.