Optimisation of entrapped activated carbon conditions to remove coloured compounds from winery wastewaters

• Published in: Bioresource technology 2011-06, Vol.102 (11), p.6437-6442
• Main Authors: Devesa-Rey, R., Bustos, G., Cruz, J.M., Moldes, A.B.
• Format: Article
• Language: English
• Subjects: Absorption; Activated carbon; Adsorption; Applied sciences; Biological and medical sciences; Calcium chloride; Charcoal - chemistry; Color; Colour; Exact sciences and technology; Food industries; Fundamental and applied biological sciences. Psychology; Immobilization; Models, Chemical; Pollution; Reduction; Regression Analysis; Sodium alginate; Time Factors; Use and upgrading of agricultural and food by-products. Biotechnology; Vinasse; Waste Disposal, Fluid; Waste water; Wastewaters; Water Pollutants, Chemical - isolation & purification; Water Purification - methods; Water treatment and pollution; Wine; Wineries
• ISSN: 0960-8524; 1873-2976
• DOI: 10.1016/j.biortech.2011.03.072

Evaluation of the influence of activated carbon and calcium chloride, at intermediates sodium alginate concentrations, on the absorbance reduction of winery wastewaters at: (a) 280nm; (b) 465nm; (c) 530nm; (d) 665nm after 24h. [Display omitted] ▸ Immobilized activated carbon efficiently remove coloured compounds. ▸ Solutions contain 2 % of activated carbon, 5 % of Na-alginate and 0.475 M of CaCl2. ▸ Beads are easy-to-handle, a long-lived material and decrease the sealing of membranes. The objective of this work was to study the entrapped conditions of activated carbon in calcium-alginate beads for the clarification of winery wastewaters. An incomplete 33 factorial design was carried out to study the efficiency of activated carbon (0.5–2%); sodium alginate (1–5%); and calcium chloride (0.050–0.900M), on the following dependent variables: colour reduction at 280, 465, 530 and 665nm. The activated carbon and calcium chloride were the most influential variables in the colour reduction. Nearly 100% colour reductions were found for the wavelengths assayed when employing 2% of activated carbon, 5% of sodium alginate and intermediate concentrations of calcium chloride (0.475M). Instead, other conditions like, 2% of activated carbon, 4% of sodium alginate and 0.580M of calcium chloride can also give absorbance reductions close to 100%.