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TitleA design of experiments to assess methane production from anaerobic co-digestion of sewage sludge with lipid rich waste
Author(s)Oliveira, João Vítor
Duarte, T.
Costa, J. C.
Cavaleiro, Ana Júlia
Pereira, M. A.
Alves, M. M.
KeywordsAnaerobic co-digestion
Sewage sludge
Lipid rich waste
Wastewater treatment plant
Design of Experiments
Issue date2017
CitationOliveira, João V.; Duarte, T.; Costa, J. C.; Cavaleiro, Ana Júlia; Pereira, M. Alcina; Alves, M. Madalena, A design of experiments to assess methane production from anaerobic co-digestion of sewage sludge with lipid rich waste. AD15 - The 15th IWA World Conference on Anaerobic Digestion. Beijing, China, 17-20 October, 451-454, 2017.
Abstract(s)Redirection of sewage sludge in wastewater treatment plants (WWTP) from landfilling or incineration to biological treatment, for instance anaerobic digestion, has become a part of the current global environmental, economic and regulatory issues. A statistical approach, based on a design of experiments, was adopted in order to assess methane production from the anaerobic co-digestion of mixed sewage sludge (MS) with crude glycerol (cGly) and waste frying oil (WFO). The effect of three factors MS concentration, co-substrate concentration, and fraction of cGly (xcGly) in a mixture (w/w) of cGly and WFO on biochemical methane potential (BMP) and the maximum initial methane production rate (kCH4) was assessed by a Central Composite Design Circumscribed. In the absence of a co-substrate, MS digestion reached a BMP of (294 ± 6) L kg-1 (L of methane at standard temperate and pressure (STP) conditions per kg of VS of waste added) and a kCH4 of (64 ± 1) L kg-1 d-1 (L of methane at STP conditions per kg of VS of waste added and per day), with a biodegradability of (56 ± 1) %. After optimization, MS and co-substrate concentrations of 4.64 g L-1 and 8.77 g L-1, respectively, with xcGly of 0.8 were defined as the condition to simultaneously boost BMP (91 %) and kCH4 (250 %). An WWTP would be able to save 36.2 k in electricity per 1 000 m3 of sewage sludge produced, if the selected co-digestion conditions were applied, rather than digesting only the sludge.
TypeConference paper
Publisher version
AccessRestricted access (Author)
Appears in Collections:CEB - Artigos em Livros de Atas / Papers in Proceedings

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