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Enhanced biomethane production by co-digestion of mixed sewage sludge and dephenolised two-phase olive pomace
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Orientador(es)
Resumo(s)
In this study, co-digestion of mixed sewage sludge from a wastewater treatment plant (WWTP) and partially dephenolised twophase
olive pomace (DOP) as a co-substrate was addressed with the aim of improving the biodigestibility of both substrates. The
introduction of DOP into WWTP anaerobic digester facilities could significantly increase biomethane production and enhance the
sustainability of both activities. An improvement in the system’s performance was supported by stability parameters: total alkalinity
increased and stabilised with the addition of 5% v/v DOP, and the specific energy loading rate was maintained at 0.177 ± 0.03 d−1,
which indicated better buffer capacity and stability in the bioreactor, and the possibility of enhancing the organic loading rate. In terms
of average daily biogas production rate, an increase of 39% was achieved, up to 0.39 ± 0.11 L L−1d−1. Moreover, there was a 40%
and 37% improvement in specific methane production and methane production rate, respectively, up to 0.28 ± 0.02 L CH4 g TVS
−1 and
0.26 ± 0.08 L L−1d−1. In addition, the proposed strategy leads to an energy saving of 20,328.6 kWh year−1 at the WWTP as a result of
the electric energy production surplus, corresponding to an annual saving of €3293.23
Descrição
Original article
Palavras-chave
anaerobic co-digestion biowaste management dephenolised olive pomace sewage sludge phenols
Contexto Educativo
Citação
Waste Management & Research 1– 10
Editora
SAGE