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Evaluation of agronomic properties of digestate from macroalgal residues anaerobic digestion: Impact of pretreatment and co-digestion with waste activated sludge

Abstract : The aim of this paper is to investigate the impact of pretreating macroalgal residue (MAR) from agar-agar extraction and its co-digestion with sewage sludge on methane production and the agronomic quality of the digestates produced. First, different pretreatments were assessed on BMP tests. Among milling technologies used, knife milling with a 4 mm-screen improved methane production by 25%. The MAR was then knife milled before alkaline, acid and thermal pretreatment. KOH pretreatment (5% TS basis, 25 °C for 2 days) led to the highest methane improvement. It was applied to semi-continuous anaerobic digestion and methane production achieved 237 Nml/gVS which was 20% higher than the control (198 Nml/gVS). In comparison to MAR mono-digestion, co-digestion with thickened activated sludge produced less methane (184 Nml/gVS) but reduced H2S emission by 91%. None of the digestates was toxic for the germination or growth of wheat and tomato plants. Particularly, co-digestion had the highest impact on tomato plant dry weight (+94% compared to soil alone) mainly due to the phosphorous brought by sludge. However, the impact of alkaline pretreatment on plant growth was not significant.
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https://hal.inrae.fr/hal-02562269
Contributor : Dominique Fournier Connect in order to contact the contributor
Submitted on : Monday, May 4, 2020 - 3:07:42 PM
Last modification on : Wednesday, May 18, 2022 - 3:06:06 PM

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Doha Elalami, Florian Monlau, Hélène Carrère, Karima Abdelouahdi, Celine Charbonnel, et al.. Evaluation of agronomic properties of digestate from macroalgal residues anaerobic digestion: Impact of pretreatment and co-digestion with waste activated sludge. Waste Management, Elsevier, 2020, 108, pp.127-136. ⟨10.1016/j.wasman.2020.04.019⟩. ⟨hal-02562269⟩

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