Treatment of Cheese Whey Wastewater: Combined Coagulation−Flocculation and Aerobic Biodegradation

Abstract

Cheese wastewater has been treated by means of a coagulation-flocculation process. Three different coagulants have been used, namely, FeSO(4), Al(2)(SO(4))(3), and FeCl(3). When FeSO(4) was used, the optimum conditions were obtained using 250 ppm of the salt at pH 8.5. At these conditions, 50 and 60% of chemical oxygen demand (COD) and biological oxygen demand (BOD) were reduced, respectively. Al(2)(SO(4))(3) achieved slightly lower reductions of COD and BOD; however, the amount needed was significantly higher (1000 ppm). When FeCl(3) was added, similar results to those obtained with FeSO(4) were experienced; again, 250 ppm was enough to eliminate COD and BOD contents in the range of 40-60%, depending upon operating conditions. The sludge formed in the coagulation-flocculation process did show acceptable settling properties, which is crucial in settling tank design. A first approach to sedimentation tank design is also conducted on the basis of experimental results. The aerobic biodegradation of cheese whey wastewater achieves the reduction of the main contaminant indicators (COD and BOD) to values close to 100%; however, effluents coming from the coagulation-flocculation pre-stage necessitate half of the time required by the non-pretreated raw wastewater.

Tratamiento Fisicoquímico de las Aguas Residuales Generadas en el Proceso de Beneficio de Arcillas y Alternativas de Uso de los Lodos Generados en el Proceso

“…Por otra parte, Rivas y colaboradores (Rivas et al, 2010) evaluaron el tratamiento de aguas residuales provenientes de una industria de quesos (SST entre 1628-4780 mg/L, turbiedad entre 1331-2004 UTN), utilizando tres coagulantes diferentes: FeSO4, Al2(SO4)3 y FeCl3. Cuando se utilizó FeSO4, las condiciones óptimas obtenidas fueron 250 ppm de la sal a un pH de 8.5, obteniéndose un 50% y 60% de reducción de la DQO y de la DBO, respectivamente.…”

Impactos ambientais de efluentes de laticínios em curso d’água na Bacia do Rio Pomba

“…Portanto, a importância ambiental do soro está relacionada ao volume, ao baixo aproveitamento e ao potencial poluidor (ROHLFES et al, 2011) (BRIÃO &TAVARES, 2007). O tempo de detenção hidráulica nas ETEs, que pode variar de 8 a 13 dias para estabilizar a matéria orgânica, requer sistemas de maior porte, inviáveis em grandes volumes de efluentes produzidos (RIVAS et al, 2010).…”

Kinetics of Microbial Production of 2, 3-Butanediol from Cheese Whey Using Klebsiella pneumonia

“…Biological systems, either aerobic or anaerobic can be used in the treatment of whey based on the microbes used, availability and product formation [2], [3], [12]. However, anaerobic digestion offers advantages over aerobic process, especially in the production of toxic products from cheese whey [8]- [10]. Though, aerobic biodegradation of cheese whey achieves a higher degree of the reduction of the main contaminant indicators of COD and BOD compared with anaerobic biodegradation [8], [10].…”

“…However, anaerobic digestion offers advantages over aerobic process, especially in the production of toxic products from cheese whey [8]- [10]. Though, aerobic biodegradation of cheese whey achieves a higher degree of the reduction of the main contaminant indicators of COD and BOD compared with anaerobic biodegradation [8], [10]. A number of options have been proposed to convert permeate to value added products and other more profitable alternatives [1]- [3], [10]- [12], [14], one of which is production of potentially value added chemical 2,3-BD having diverse applications in chemical industries.…”

“…This necessity has been heightened, in recent years, by the increased volume of cheese whey being produced. Cheese whey has been treated by means of a coagulation-flocculation process by the application of coagulants FeSO 4 , Al 2 (SO 4 ) 3 , and FeCl 3 depending upon operating conditions on the basis of experimental results of sedimentation tank design for the treatment of COD and BOD respectively [8]. However, effluents coming from the coagulation-flocculation pre-stage necessitate half of the time required by the non-pretreated raw [3], [8]- [10].…”