The treatability study of high strength pet food wastewater: a continuous flow aerobic system performance evaluation

Environmental Technology
Lei Victor LiuAmerjeet Bassi

Abstract

This paper presents continuous flow two stage activated sludge treatability studies for the treatment of pet food wastewaters characterized by oil & grease concentration of 50,000-66,000 mg l(-1), total COD & BOD concentrations of 100,000 mg l(-1) and 80,000 mg l(-1), respectively. A pre-treatment system, dissolved air flotation (DAF) achieved 97-99% reduction in oil and grease down to about 400-800 mg l(-1). The pilot experimental results showed that for the DAF pretreated effluent, 97% soluble COD removal efficiency can be achieved by using two stage conventional activated sludge system at a 6-7 days HRT and applied initial soluble COD to biomass ratio of 1.17 mg COD mg VSS. Meanwhile, the system achieved 99.9% soluble BOD removal. Analysis of system kinetics indicated that this particular wastewater is very difficult to biodegrade, with an extremely high half velocity constant "Ks" of 5800 mg l(-1). The research showed the potential applications of activated sludge systems for the treatment of high oil and grease wastewater.

Citations

Aug 26, 2006·Water Environment Research : a Research Publication of the Water Environment Federation·C AcharyaR Kurian

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