Valorization of Waste Obtained from Oil Extraction in Moringa Oleifera Seeds: Coagulation of Reactive Dyes in Textile Effluents

• Published in: Materials Vol. 7; no. 9; pp. 6569 - 6584
• Main Authors: Vilaseca, Mercè, López-Grimau, Víctor, Gutiérrez-Bouzán, Carmen
• Format: Journal Article Publication
• Language: English
• Published: Switzerland MDPI AG 12-09-2014; MDPI
• Subjects: ADSORBENTS; Aigües residuals; Biodiesel fuels; Carcinogens; Coagulation; COAGULATION/FLOCCULATION; COLOR; Color removal; Colorants; Contaminació; Cosmetics; Cotton; cotton dyeing; Cotton fabrics; Cotó; DECOLORIZATION; DEGRADATION; Drinking water; DYEBATH EFFLUENTS; Dyes; Dyes and dyeing; Effluents; Electrolytes; Enginyeria química; Enginyeria tèxtil; Environmental aspects; Environmental impact; Impacte ambiental; Indústria tèxtil; Indústries; Indústries químiques; Moringa oleifera; NANOFILTRATION; natural coagulant; Purification; Química; Química tèxtil; Reactive dyes; REMOVAL; Reutilització; Seeds; Sewage; Textile industry; Textile research; textile wastewater; Tints i tenyit; WASTEWATERS; Water; Water reuse; WATER TREATMENT; Àrees temàtiques de la UPC; Spain; India; Moringa oleifera; color removal; water reuse; cotton dyeing; reactive dyes; natural coagulant; textile wastewater
• ISSN: 1996-1944; 1996-1944
• DOI: 10.3390/ma7096569

Moringa oleifera seeds contain about 40% of highly valued oil due to its wide range of applications, from nutritional issues to cosmetics or biodiesel production. The extraction of Moringa oil generates a waste (65%-75% of seeds weight) which contains a water soluble protein able to be used either in drinking water clarification or wastewater treatment. In this paper, the waste of Moringa oleifera extraction was used as coagulant to remove five reactive dyes from synthetic textile effluents. This waste constitutes a natural coagulant which was demonstrated to be effective for the treatment of industrial reactive dyestuff effluents, characterized by alkaline pH, high NaCl content and hydrolyzed dyes. The coagulation yield increased at high NaCl concentration, whereas the pH did not show any significant effect on dye removal. Moringa oleifera showed better results for dye removal than the conventional treatment of coagulation-flocculation with FeCl₃ and polyelectrolyte. Treated water can be reused in new dyeing processes of cotton fabrics with high quality results.