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Advisor(s)
Abstract(s)
The accelerated growth of the population brings with it an increase in the generation
of agro-industrial effluents. The inadequate discharge of these effluents significantly affects the
quality of water resources. In this way, it becomes important to invest in treatment processes
for agro-industrial effluents, particularly low-cost ones. In this context, the present study
includes the design and construction of an UASB reactor and optimization of the anaerobic
digestion treatment of the raw effluent from sweet chestnut production in the agro-industrial
company Sortegel. The efficiency of the system was evaluated through the determination /
monitoring of oxygen chemical oxygen demand (COD), biochemical oxygen demand (BOD5),
total suspended solids (TSS), biogas production rate and quality (% methane). The reactor was
fed for 25 weeks and operated under mesophilic conditions (temperature 30-40 °C). Different
values were tested for the hydraulic retention time (HRT) and volumetric flow rate (VF): 0.66
days (VF=1509 L.m-3.d-1); 1.33 days (VF=755 L.m-3.d-1); 2.41 d days (VF=415 L.m-3.d-1). The
average COD removal efficiency reached values of 69%, 82% and 75%, respectively, and
simultaneously the associated BOD5 removal efficiency was 84%, 91% and 70%. As regards
TSS, removal values were 78%, 94% and 63%. In addition, high methane production rates
were obtained, between 2500 and 4800 L CH4.kg-1 COD removed d-1. For all the hydraulic
retention times tested, high concentrations of methane in the biogas were recorded: 66-75%,
70% and 75% for HRT of 0.66, 1.33 and 2.41 days, respectively.
Description
Keywords
Energy valorization UASB Industrial effluent Anaerobic digestion
Citation
Martins, Ramiro; Boaventura, Rui; Paulista, Larissa (2017). Treatment and energy valorisation of an agro-industrial effluent in upflow anaerobic sludge reactor (UASB). In IOP Conference Series: Earth and Environmental Science. Prague: IOP Publishing Ltd. ISSN 1755-1307
Publisher
IOP Science