The use of a natural coagulant (Opuntia ficus-indica) in the removal for organic materials of textile effluents.
The goal of this study was to investigate the activity of the coagulant extracted from the cactus Opuntia ficus-indica (OFI) in the process of coagulation/flocculation of textile effluents. Preliminary tests of a kaolinite suspension achieved maximum turbidity removal of 95 % using an NaCl extraction solution. Optimization assays were conducted with actual effluents using the response surface methodology (RSM) based on the Box-Behnken experimental design. The responses of the variables FeCl3, dosage, cactus dosage, and pH in the removal of COD and turbidity from both effluents were investigated. The optimum conditions determined for jeans washing laundry effluent were the following: FeCl3 160 mg L(-1), cactus dosage 2.60 mg L(-1), and pH 5.0. For the fabric dyeing effluent, the optimum conditions were the following: FeCl3 640 mg L(-1), cactus dosage 160 mg L(-1), and pH 6.0. Investigation of the effects of the storage time and temperature of the cactus O. ficus-indica showed that coagulation efficiency was not significantly affected for storage at room temperature for up to 4 days.
Departamento de Pós-graduação em Química, Universidade Estadual de Maringá, Av. Colombo 5790, 87020-900, Maringá, Brazil.
Maísa Tatiane Ferreira
MT
de Souza
Elizangela
E
Ambrosio
Cibele Andrade
CA
de Almeida
Thábata Karoliny Formicoli
TK
de Souza Freitas
Lídia Brizola
LB
Santos
Vitor
V
de Cinque Almeida
Juliana Carla
JC
Garcia
D003029:Coagulants / Q000737:chemistry; D004784:Environmental Monitoring; D005427:Flocculation; D007220:Industrial Waste / Q000032:analysis*; D029747:Opuntia / Q000737:chemistry*; D013784:Textiles; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*; D018508:Water Purification / Q000379:methods
D003029:Coagulants; D007220:Industrial Waste; D014874:Water Pollutants, Chemical