Population dynamics of microbial native consortia efficient for textile wastewater degradation

CERETTA, M.B.; IRAZOQUI, JM; PERSICO, MM; NERCESSIAN, D.; WOLSKI, E. A.

Environmental Science: Water Research & Technology

Royal Society of Chemistry

Año: 2022

2053-1419

Wastewater produced by textiles industries are one of the effluents most difficult to treat due to their great volume, toxicity and variable composition. In this work, a comprehensive study on the degradation of a pure textile effluent by two native bacterial consortia was carried out. The study ranges from consortia composition, structure and dynamic to effluent biodegradation and toxicity analysis. Both bacterial communities degrade the pure textile wastewater without pretreatment and without the addition of nutritional sources, reducing TOC, COD and pH. One consortium was more efficient to achieve effluent decolorization and reduction of COD, while the other one showed a better performance to reduce toxicity. Diversity analysis of both communities showed that there wasn?t a marked loss of diversity during degradation kinetics. Relative abundance of Gammaproteobacteria was increased and within this group, orders like Aeromonadal, Enterobacterial and Pseudomonadal were the main represented. Biodegradation ability of isolated strains showed that none of them was able to degrade textile effluent independently. The results as a whole demonstrated that microbial consortia have the ability to achieve complex functions that are not possible for pure cultures. Furthermore, toxicity assays showed the importance to carry out this kind of tests to select appropriately the final destination of the treated wastewater.