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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472 EISSN: 1735-1472
Vol. 12, No. 5, 2015, pp. 1727-1736
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Bioline Code: st15161
Full paper language: English
Document type: Research Article
Document available free of charge
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International Journal of Environment Science and Technology, Vol. 12, No. 5, 2015, pp. 1727-1736
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Two-phase anaerobic co-digestion of used vegetable oils’ wastes and pig manure
Hidalgo, D.; Gó;mez, M.; Martín-Marroquín, J.M.; Aguado, A. & Sastre, E.
Abstract
The purpose of this work was to study the
anaerobic co-digestion of all the by-products generated
during the processing of used vegetable oils (UVO) with the
objective of proposing a solution for the treatment of these
wastes. More specifically, this study investigates the
advantages of two-phase anaerobic digestion for treating a
mixture (1/5 v/v) of UVO processing wastes (OW) and pig
manure (PM) using two semi-continuous digesters operated
at mesophilic temperature (37 ± 1 °C). The experiments
were conducted at hydraulic retention time (HRT) of 0.5, 1,
2 and 4 days in the first stage (acidifier) and at HRT of 11.5,
15, 18 and 20 days in the second stage (methaniser). The
results revealed that the HRT had a high influence on the
soluble chemical oxygen demand (sCOD) and total dissolved
solids (TDS) removal. The maximum total sCOD
removal efficiency of 86.4 % and TDS removal efficiency
of 81.9 % was achieved at 20 days of global HRT. The
maximum biogas production of 0.65 m3 per kilogramme of
volatile dissolved solids (VDS) was removed, corresponding
to a methane production of 0.42 m3 CH4 kg-1. VDS
removed (65 % CH4) was also achieved at 20 days of HRT.
The two-phase digestion system showed good stability,
which was mainly attributed to the strong buffering capacity
with the two-phase system and the high alkalinity from PM
when co-digested with OW. The results obtained from this
study provide fundamental information for scaling up a
high-performance two-phase anaerobic system in the future.
Keywords
Co-digestion; Hydraulic retention time; Oily waste; Pig manure; Two-phase anaerobic reactor; Used vegetable oil
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