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- Title
A novel textile wastewater treatment using ligninolytic co-culture and photocatalysis with TiO<sub>2</sub>.
- Authors
Blanco-Vargas, Andrea; Ramírez-Sierra, Christian Fernando; Duarte-Castañeda, Marcela; Beltrán-Villarraga, Milena; Medina-Córdoba, Luz Karime; Florido-Cuellar, Alex-Enrique; Cardona-Bedoya, Jairo Armando; Campos-Pinilla, Claudia; Pedroza-Rodríguez, Aura Marina
- Abstract
Textile industries produce effluentwastewater that, if discharged, exerts a negative impact on the environment. Thus, it is necessary to design and implement novel wastewater treatment solutions. A sequential treatment consisting of ligninolytic co-culture with the fungi Pleurotus ostreatus and Phanerochaete crhysosporium (secondary treatment) coupled to TiO2/UV photocatalysis (tertiary treatment) was evaluated in the laboratory in order to discolor, detoxify, and reuse textile effluent wastewater in subsequent textile dyeing cycles. After 48 h of secondary treatment, up to 80% of the color in the wastewater was removed and its chemical and biochemical oxygen demands (COD, and BOD5) were abated in 92% and 76 %, respectively. Laccase and MnP activities were central to color removal and COD and BOD5 abatement, exhibiting activity values of 410 U L-1 and 1 428 U L-1, respectively. Subjecting wastewater samples to 12 h of tertiary treatment led to an 86% color removal and 73% and 86% COD and BOD5 abatement, respectively. The application of a sequential treatment for 18 h improved the effectiveness of the wastewater treatment, resulting in 89% of color removal, along with 81% and 89% COD and BOD5 abatement, respectively. With this sequential treatment a bacterial inactivation of 55% was observed. TiO2 filmswere reused continuously during two consecutive treatment cycles without thermic reactivation. Removal percentages greater than 50% were attained. Acute toxicity tests performed with untreated wastewater led to a lethality level of 100% at 50% in Hydra attenuata and to a growth inhibition of 54% at 50% in Lactuca sativa. Whereas sequentially treated wastewater excreted a 13% lethality at 6.25% and an inhibition of 12% at 75% for H. attenuata and L. sativa, respectively. Finally, sequentially treated wastewater was reused on dyeing experiments in which 0.86 mg g-1 adsorbed dye per g of fabric, that is equivalent to 80% of dye adsorption.
- Subjects
WASTEWATER treatment; PHOTOCATALYSIS; TITANIUM dioxide
- Publication
Universitas Scientiarum, 2018, Vol 23, Issue 3, p437
- ISSN
0122-7483
- Publication type
Article
- DOI
10.11144/Javeriana.SC23-3.antw