A full-scale UASB reactor for treatment of pig and cattle slaughterhouse wastewater with a high oil and grease content

Abstract

-This paper discusses the performance of an 800m 3 full-scale UASB reactor in treating meatpacking plant and slaughterhouse effluents containing high concentrations of oil and grease (O&G) (413-645 mg/L), resulting in a COD/O&G ratio of 26-32%. Those macromolecules were considered responsible for the unbalance of the system resulting in a total washout of the biomass. The removal of O&G from the influent using a physicochemical system (coagulation-flocculation) improved the physical characteristics of the anaerobic sludge, controlling the biomass washout. Reactor performance was significantly improved when the COD/O&G ratio influent was maintained in the 10%. The COD and O&G removal rates obtained after implantation of the physicochemical system were 70-92% and 27-58%, respectively. The specific methanogenic activity (SMA) of the biomass shows towards a tendency stabilisation and adaptation to the substrate influent. Pretreatment of the influent allowed the maximum organic load to be increased (1.46 to 2.43 Kg COD/m 3 .d) and improved the quality of the effluent.

Caractérisation physico-chimique et bactériologique des eaux usées brutes du réseau d’égout de la ville d’Abidjan

“…Au regard des valeurs guides du SIIC, seul, le pH de ces effluents est élevé et pourrait affecter la croissance et la survie des microorganismes (El Guarim et Belghyti, 2006). Par contre, sur les autres sites, il reste légèrement alcalin et comparable à l'étude de Miranda et al (2005). La température dans l'ensemble du réseau respecte la valeur limite de 40 °C pour les rejets en milieu récepteur.…”

Slaughterhouse wastewater characteristics, treatment, and management in the meat processing industry: A review on trends and advances

“…A maximum 95% removal of BOD was obtained with OLRs up to 31,000 mg/L under optimum conditions, with temperature values ranging between 25 and 39 C at HRTs between 3.5 and 4.5 h. Miranda et al (2005) assessed the performance of an 800 m 3 UASB for SWW treatment. Influent concentrations of COD and oil and grease (O&G) were in the range of 1400e3600 and 413e645 mg/L, respectively.…”

Evaluation of Stability Factors in the Anaerobic Treatment of Slaughterhouse Wastewater

“…Several methods have been proposed for evaluating anaerobic processes, with the acidogenic and methanogenic activity study being most commonly used for that purpose [10,11]. The aforementioned stages are utilized to evaluate the behavior of the biomass under the influence of potentially inhibitory compounds such as VFAs and in order to establish the degree of biodegradability of the substrate [12].…”