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Treatment of laundry wastewater using extracellular polymeric substances (EPS).


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Kumar, Sushil; Mostafazadeh, Ali Khosravanipour; Drogui, Patrick ORCID logoORCID: https://orcid.org/0000-0002-3802-2729 et Tyagi, Rajeshwar Dayal (2023). Treatment of laundry wastewater using extracellular polymeric substances (EPS). Environmental Systems Research , vol. 12 , nº 10. pp. 1-15. DOI: 10.1186/s40068-023-00289-5.

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The problem of management and treatment of wastewater from commercial laundries is a matter of concern. The present study provides an effective and eco-friendly solution to the treatment of wastewater from commercial laundries in Quebec (Canada) by using extracellular polymeric substance (EPS) as bio-flocculant. EPS was produced from valorization of crude glycerol and paper mill sludge by a bacterial strain (BS-04). Two different types of EPS: Slime EPS (S-EPS) and Broth EPS (B-EPS) were used for treatment of commercial laundry wastewater (CLWW). This is the first study for treatment of CLWW using bio-flocculant EPS. A comparison between the conventional treatment of laundry wastewater (LWW) by chemical coagulants (FeSO₄ , CaCl₂ , Alum) and enhanced treatment by bio-flocculant EPS has been drawn in the study. Moreover, LWW treatment by combination of EPS and chemical coagulants was also investigated. It was observed that S-EPS (0.6 g/L) gave better flocculation activity (FA) than B-EPS. S-EPS alone can remove 83.20% of turbidity, 77.69% suspended solids (SS) and 76.37% chemical oxygen demand (COD). The best results were obtained by combining S-EPS (0.6 g/L) together with alum (300 mg/L) at pH 7 for treatment time of 30 min. This combination was able to remove 98% of turbidity, 95.42 % of SS and 83.08% of COD from LWW. When treatment time has been increased to 4 h at pH 7, it resulted in more than 88% COD removal from CLWW.

Type de document: Article
Mots-clés libres: commercial laundry wastewater (CLWW); extracellular polymeric substance (EPS); slime EPS (S-EPS); broth EPS (B-EPS); linear alkylbenzene sulfonates (LAS); nonylphenol Ethoxylates (NPE); chemical oxygen demand (COD)
Centre: Centre Eau Terre Environnement
Date de dépôt: 02 nov. 2023 13:27
Dernière modification: 07 nov. 2023 14:40
URI: https://espace.inrs.ca/id/eprint/13698

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