Abstract
ABSTRACT The progression of the organic loading rate (OLR) up to a certain limit increases biogas production. The limit and operation range vary according to the configuration of the reactor and are associated with other variables that generate different results with respect to biogas yield (BY) and biogas productiveness (BP). The aim of this study was to investigate the effect of the OLR on the BY and BP from swine manure in continuous stirred tank reactors (CSTRs) and upflow anaerobic sludge blanket reactors (UASBs). In the assay with the CSTR, the best operational condition was at an OLR of 0.7 gVS add L−1 reactor d−1 and a hydraulic retention time (HRT) of 18 days. At this operational condition, 0.8 LN biogas gVS add−1 of BY and 0.6 LN biogas L−1 reactor d−1 of BP were obtained. In the assay with the UASB, the best operational condition was at an OLR of 2.2 gVS add L−1 reactor d−1 and an HRT of two days, and 0.7 LN biogas gvs add−1 of BY and 1.6 LN biogas L−1 reactor d−1 of BP were obtained. The results demonstrate the effects of OLR changes on the biogas production in the CSTR and UASB, avoiding the underutilization or overloading of such equipment and enabling collaboration in projects for power generation from biogas in swine farms.
Highlights
Swine production is one of the main livestock activities in the world, in China, Europe, the USA, and Brazil (Tápparo et al, 2019)
The results demonstrate the effects of organic loading rate (OLR) changes on the biogas production in the continuous stirred tank reactors (CSTRs) and upflow anaerobic sludge blanket reactors (UASBs), avoiding the underutilization or overloading of such equipment and enabling collaboration in projects for power generation from biogas in swine farms
The results demonstrate the effect of different OLRs on biogas production, the behavior of other variables (HRT, Volatile fatty acids (VFAs)/total alkalinity (TA) ratio, and Free ammonium (FA)) in the CSTR and UASB, and important operational information to be applied at full scale to ensure stable biogas production from swine manure (SM)
Summary
Swine production is one of the main livestock activities in the world, in China, Europe, the USA, and Brazil (Tápparo et al, 2019). If poorly planned, it can have serious environmental impacts because of the high volume of waste, which is characterized by a high concentration of organic matter, nutrients (phosphorus, nitrogen, and potassium), heavy metals (copper and zinc), pathogens, and antibiotics (Steinmetz et al, 2009; Viancelli et al, 2013). It is estimated that pork production is responsible for 9% of the total greenhouse gas emissions attributed to the livestock sector. In this amount, 19% comes from the methane produced by inadequate manure management (FAO, 2013; Bilotta et al, 2019). Anaerobic digestion (AD) is widely used for the treatment of animal waste and to mitigate the environmental impacts of swine production. The utilization of methane gas as a renewable energy
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