Abstract
The anaerobic digestion efficiency varies according to several factors, such as: substrate carbon / nitrogen ratio, temperature, pH, alkalinity, and acidity. The main objective of this study was to describe the behavior of pH, alkalinity and total acidity of the affluent and effluent of a swine wastewater treatment system, in order to better understand the physicochemical process. The pH was measured immediately after collecting, and the methods of Jenkins et al. (1983) and Ripley et al. (1986) were used for quantifying the alkalinity, and the potentiometric method, for the acidity. The treatment system worked without large pH variation concerning the affluent and effluent of each unit, indicating good buffering conditions. The Ripley ratio (IA / PA) is characteristic for each effluent and dependent on the stage at which the reactor is working, and was determined as 1.96 for hydrolysis and acidification tank, 1.56 for reactors working on first stage (ABR), and 1.44 for reactors working on second stage (UASB).
Highlights
Much attention has been given to swine feedlots by environmental control offices, owed the high pollution potential from this human activity
This study examined and described the behavior of pH, alkalinity, and total acidity of a swine wastewater treatment system, in order to better understand the relationship between these parameters and the biological treatment process
The Anaerobic Baffled Reactor (ABR) and Upflow Anaerobic Sludge Blanket reactor (UASB) reactors operated with Hydraulic Retention Time (HRT) of 15.4 and 9.7 hours, respectively, Hydraulic Load (HL) of 1.57 m3 m-3 d-1 for ABR and 2.5 m3 m-3 d-1 for UASB; OLR of 4.46 kg m-3 day-1 for ABR and 1.77 kg m-3 day-1 for UASB
Summary
Much attention has been given to swine feedlots by environmental control offices, owed the high pollution potential from this human activity. The current law requires the treatment of waste prior to discharge in water bodies, in order to prevent pronounced environmental problems (PEREIRA et al, 2009, 2010a, b and c, 2011). In this context, the anaerobic digestion appears as a great option, because significantly reduces the pollution potential, generates energy in the form of biogas, and allows the reuse of the treated effluent in fertigation. The biogas produced is frequently being used as a substitute of natural gas, especially in Europe (CAMPOS et al, 2010; SILVA et al, 2011a and b).
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