Treatment of Confectionery and Gum Factory Wastewater Effluent

Abstract

A pilot plant for the treatment of wastewater was designed, constructed and installed for the continuous treatment of 250 l/d wastewater originating from a gum and confectionery factory. The pilot plant consisted of an equalizer, chemical mixing tank, aerator, clarifier, disinfectant tank and sand filter as the main components. In addition, a set of centrifugal and dosing pumps, an air blower and a pH controller were added. The industrial-scale treatment unit could handle a 50 m3/d effluent flow rate composed of combined industrial and municipal wastewater effluents heavily loaded with organic and biologically resistant pollutants (sugars, gums, pesticides and detergents) with a chemical oxygen demand (COD) value extending to 25 000 ppm. House-keeping arrangements and the isolation of some streams were necessary in order to attain an end-pipe effluent capable of treatment by conventional procedures at reasonable cost values. Different operating conditions were tested in order to treat effluent loaded with a COD value reaching 5000 ppm to obtain acceptable limits capable of containment in underground wells or re-use in irrigation.

Photocatalytic Treatment of An Actual Confectionery Wastewater Using Ag/TiO2/Fe2O3: Optimization of Photocatalytic Reactions Using Surface Response Methodology

“…Confectionery wastewater effluents contain high amounts of sugar (sucrose), sugar alcohol, artificial sweeteners (aspartame, acesulfame, and sucralose), food additives, colorants (TiO 2 ), natural flavors, and artificial flavors that account for their high strength in chemical oxygen demand (COD) and biological oxygen demand (BOD) [1,2]. These organic compounds can cause sudden shocks and rapid dissolved oxygen depletion in the biological treatment systems when discharged to surrounding municipal wastewater treatment facilities, further causing deviation in characteristics of treated effluents [1][2][3]. Among all, artificial sweeteners, such as aspartame, acesulfame, and sucralose, are extremely stable throughout the conventional wastewater treatment processes; however, toxicity will increase after photodegradation [4][5][6].…”

“…The study conducted by Sang et al showed promising efficiency of TiO 2 in degrading the artificial sweeteners found in confectionery wastewater and in mineralizing the intermediate products generated during the degradation process [4]. Photomineralization is a process in which the photogenerated hydroxyl radical participates in the redox reactions with the organic materials in aqueous solutions which produce intermediate products (aldehydes and carboxylic acids) and, finally, achieve complete oxidation of carbon atoms [1,4,9,10,13]. However, the application of TiO 2 is limited by the ultraviolet (UV) activation and the fast recombination rate of the generated electron-hole pairs [10,12,14].…”

Anaerobic Treatment of Industrial Effluents: An Overview of Applications

“…Confectionery industry generates high amounts of wastewater which contains high concentrations of readily biodegradable organic materials characterized with high COD and BOD (Beal & Raman, 2000;Diwani et al, 2000). Orhon et al (1995) determined the initial soluble inert COD percentage of confectionary industry wastewaters between 1,5-7,1% under aerobic conditions.…”

Determinação Da Produção De Biogás Em Uma Fábrica De Chocolates Para Fins De Aproveitamento Energético

“…Em geral, os efluentes das fábricas de chocolates e derivados contêm altas concentrações de matéria orgânica facilmente biodegradável, com o teor de Demanda Química de Oxigênio (DQO) variando entre 2500 e 5400 mg/L e Demanda Bioquímica de Oxigênio (DBO) entre 1840 e 4910 mg/L (BEAL; RAMAN, 2000;DIWANI et al, 2000;ERSAHIN et al, 2011). Estes efluentes não contêm ingredientes tóxicos, mas possuem alto teor de sólidos totais (ST), além dos valores elevados de DQO e DBO (COPETTI et al, 2013), já mencionados anteriormente, que podem ser tratados por sistemas de lodos ativados convencionais (MASSARA et al, 2017).…”