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Treatment of concentrated fruit juice wastewater by the combination of biological and chemical processes



Treatment of concentrated fruit juice wastewater by the combination of biological and chemical processes



Journal of Environmental Science and Health. Part A, Toxic/Hazardous Substances and Environmental Engineering 47(12): 1809-1817



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.

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Accession: 036479809

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PMID: 22755528

DOI: 10.1080/10934529.2012.689244


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