Fenton-like application to pretreated cheese whey wastewater.
Cheese whey wastewater has been treated by the Fenton-like oxidation system after being pre-processed through a coagulation - flocculation stage with FeCl3 or alternatively, through a sedimentation step with Ca(OH)2 plus aerobic digestion. In the first case, Fenton-like oxidation is capable of reducing the initial COD (chemical oxygen demand) to 80% of the initial value, 20% of COD shows recalcitrance to chemical oxidation regardless of the operating conditions used. In the second case, the oxidation system is capable of removing almost the total COD present in the pretreated effluent. Given the lower values of initial COD, complete COD conversion is achieved at short reaction times within minutes depending on the initial reagent concentration. Removal of Fe(III) from the oxidation treatment can be achieved by Ca(OH)2 addition. Sedimentation pH significantly affects the observed settling rate. Hence, neutral conditions lead to better results than slightly acidic pHs.
Departamento de Tecnologias e Ciências Aplicadas, Escola Superior Agrária de Beja, IPBeja, Rua de Pedro Soares, Apartado 158-7801-902, Beja, Portugal; Departamento de Ingeniería Química y Química Física, Facultad de Ciencias, UNEX, Avenida de Elvas S/N, 06071 Badajoz, Spain. Electronic address: ana.prazeres@ipbeja.pt.
Ana R
AR
Prazeres
Fátima
F
Carvalho
Javier
J
Rivas
D000332:Aerobiosis; D000818:Animals; D001673:Biodegradation, Environmental; D017610:Calcium Compounds / Q000737:chemistry*; D002611:Cheese; D002712:Chlorides / Q000737:chemistry*; D003612:Dairying; D005290:Ferric Compounds / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D007501:Iron / Q000737:chemistry; D008892:Milk / Q000737:chemistry; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D014865:Waste Disposal, Fluid / Q000379:methods*; D062065:Wastewater / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry* / Q000378:metabolism
D017610:Calcium Compounds; D002712:Chlorides; D005290:Ferric Compounds; D006861:Hydrogen Peroxide; D007501:Iron; D010087:Oxides; D062065:Wastewater; D014874:Water Pollutants, Chemical; C045076:Fenton's reagent; C016538:lime; C024555:ferric chloride
Biodegradation; COD removal; Coagulation–flocculation; Dairy effluents; Fenton-like; Sedimentation