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Use of Natural Coagulants in the Removal of Color and Turbidity from Laundry Wastewater

Authors
  • de Oliveira Cardoso Nascimento, Camila1
  • Veit, Márcia Teresinha1
  • Palácio, Soraya Moreno1
  • da Cunha Gonçalves, Gilberto2
  • 1 Western Paraná State University-UNIOESTE, Campus of Toledo, Rua da Faculdade 645, Jd. Santa Maria, Toledo, PR, 85903-000, Brazil , Toledo (Brazil)
  • 2 Federal Technological University of Paraná-UTFPR, Rua Cristo Rei 19, Vila Becker, Toledo, PR, 87020-900, Brazil , Toledo (Brazil)
Type
Published Article
Journal
Water Air & Soil Pollution
Publisher
Springer-Verlag
Publication Date
Jul 09, 2021
Volume
232
Issue
7
Identifiers
DOI: 10.1007/s11270-021-05253-6
Source
Springer Nature
Keywords
Disciplines
  • Article
License
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Abstract

Laundry wastewater has a high amount of dirt from the washed items and chemical additives used in washing process. Aiming the primary treatment of this type of wastewater, three different natural coagulants (Tanfloc POP, Tanfloc SL, and Tanfloc SG) were evaluated in the removal of color and turbidity by the coagulation/flocculation/sedimentation process (C/F/S). The results showed that the time between 5 and 10 min was sufficient for the sedimentation of the flakes, with a time of 10 min being adopted for further studies. The statistical analysis and the cost of acquiring the coagulant were decisive in the selection of the best natural coagulant. The maximum values of color (88.7%) and turbidity (92.8%) removal efficiency occurred at a concentration of 120 mg L−1 (concentration determined by the Fischer LSD test) and the lowest cost (0.75$) obtained for the Tanfloc POP coagulant. The volume of sludge generated was higher in the treated effluent sample compared to the control sample, which proves the removal of total solids present in the effluent. The Tanfloc POP coagulant showed a high performance in removing color and turbidity from industrial laundry wastewater; it has been as a promising coagulant in the primary treatment of wastewater in this service sector.

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