title: Treatment of concentrated fruit juice wastewater by the combination of biological and chemical processes.
abstract: Concentrated fruit juice industries use a wide volume of water for washing and fruit processing, generating a large volume of wastewater. This work studied the combination of an aerobic biological process with a chemical coagulation/flocculation step to treat a high concentrated fruit juice wastewater. This wastewater presents a good biodegradability (BOD(5)/COD = 0.66) allowing a chemical oxygen demand (COD) removal above 90% in most reactors. The best results in aerobic biological treatment were obtained in reactors initially loaded with 2 g VSS L(-1) of biomass concentration and 20 g COD L(-1) of organic matter concentration. Three different kinetic models were evaluated (Monod, Haldane and Contois). The Haldane-inhibition model was the one that best fitted the COD biodegradation. AQUASIM software allowed calculate the following kinetic constants ranges for aerobic biodegradation: K (s): 6-20 g COD L(-1); v (max): 2.0-5.1 g COD g(-1) VSS day(-1) and K (i) values: 0.10-0.50 g COD L(-1). These constants corresponds to maximum removal rates (v*) between 0.11 and 0.26 g COD g(-1) VSS day(-1) for substrate concentrations (S*) from 0.77 to 3.16 g COD L(-1). A tertiary coagulation/flocculation process improved the efficiency of the biological pre-treatment. Ferric chloride was selected as best compromise to treat this wastewater. Optimal conditions were 0.44 g L(-1) of coagulant at pH = 5.5, achieving 94.4% and 99.6% on turbidity and COD removal, respectively.
authors: Centro de Química de Vila Real, Universidade de Trás-os-Montes e Alto Douro, Vila Real, Portugal.
authors: Carlos
authors: C
authors: Amor
authors: Marco S
authors: MS
authors: Lucas
authors: António J
authors: AJ
authors: Pirra
authors: José A
authors: JA
authors: Peres
mesh_terms: D001673:Biodegradation, Environmental; D057919:Biological Oxygen Demand Analysis; D019149:Bioreactors; D005427:Flocculation; D005638:Fruit / Q000737:chemistry; D007220:Industrial Waste; D014865:Waste Disposal, Fluid / Q000379:methods*
chemical_list: D007220:Industrial Waste