Treatment and reuse of textile wastewaters by mild solar photo-Fenton in the presence of humic-like substances

Abstract

In this paper, the possibility of reusing textile effluents for new dyeing baths has been investigated. For this purpose, different trichromies using Direct Red 80, Direct Blue 106, and Direct Yellow 98 on cotton have been used. Effluents have been treated by means of a photo-Fenton process at pH 5. Addition of humic-like substances isolated form urban wastes is necessary in order to prevent iron deactivation because of the formation of non-active iron hydroxides. Laboratory-scale experiments carried out with synthetic effluents show that comparable results were obtained when using as solvent water treated by photo-Fenton with SBO and fresh deionized water. Experiments were scaled up to pilot plant illuminated under sunlight, using in this case a real textile effluent. Decoloration of the effluent could be achieved after moderate irradiation and cotton dyed with this water presented similar characteristics as when deionized water was used.

Photodegradation of Malachite Green Catalyzed by Aqueous Iron(III)‐Citrate Complex: Roles of Iron(II) and Hydrogen Peroxide

“…This can be attributed to the existence of citrate, which can overcome the problem of narrow working pH range in the photo‐Fenton‐like reaction. These above results are in agreement with the reported work that the addition of humic‐like substances was necessary in order to prevent iron deactivation because ofthe formation of non‐active iron hydroxides …”

New Route for Valorization of Oil Mill Wastes: Isolation of Humic-Like Substances to be Employed in Solar-Driven Processes for Pollutants Removal

“…HLSs are macromolecules that share important characteristics with humic substances (HSs), which are one of the major constituents of natural organic matter, being its origin decomposition of vegetable or animal. 12 Recently, soluble bioorganic substances (SBO) exhibiting humic-like properties were isolated from urban wastes 13 and employed in different fields such as agriculture, 14 textile industry, 15 or pollution remediation. 16 Among the environmental applications of SBO it can be found the wastewater treatment.…”

Sulfonated and gamma-irradiated waste expanded polystyrene with iron oxide nanoparticles, for removal of indigo carmine dye in textile wastewater

“…Similar results for COD reduction were obtained with combined processes. For example: a) textile effluent treated with electro-Fenton, achieving a COD reduction of 86% (Roshini et al., 2017), b) textile wastewater by means of photo-Fenton process, with a COD reduction of 84% (Negueroles et al., 2017), c) Ultrasonic- Fenton processes for degradation of azo dye in textile wastewater, with a COD reduction of 79.25%. Finally, a similar initial COD value (2,360 mg/L) obtained in this work was comparable to that reported by (Jaafarzadeh et al., 2018).…”