Anaerobic co-digestion of industrial waste landfill leachate and glycerin in a continuous anaerobic bioreactor with a fixed-structured bed (ABFSB): Effects of volumetric organic loading rate and alkaline supplementation

Thiago Morais de Castro, Eudes José Arantes, Mônica Sarolli Silva de Mendonça Costa, Jackeline Tatiane Gotardo, Fernando Hermes Passig, Karina Querne de Carvalho and Simone Damasceno Gomes

Renewable Energy, 2021, vol. 164, issue C, 1436-1446

Abstract: Anaerobic co-digestion from industrial waste landfill (IWL) leachate and glycerin was evaluated in a continuous anaerobic bioreactor with fixed-structured bed (ABFSB) under mesophilic conditions (30 ± 1 °C). The ABFSB reactor had a useful volume of 4.77 L. The support medium consisted of polyurethane (PU) foam arranged in an orderly manner. The substrate used corresponded to a mixture of 95% IWL leachate and 5% glycerin (v/v) and the inoculum consisted of flocculent anaerobic sludge. The ABFSB reactor was operated in two phases – the 1st phase (between the 49th and the 439th days of operation): started after the inoculum adaptation and the effect of the increase in the organic loading rate (OLR) was evaluated (2; 3.5; 7.1 and 11.6 gCOD L−1 d−1); the 2nd phase (between the 440th and 471st days of operation): the effect of the reduction in alkalinity supplementation via sodium bicarbonate (NaHCO3) was evaluated (0.56; 0.42; 0.28; 0.14 gNaHCO3 gCODinfluent−1 and non-supplementation). The OLR of 7.1 gCOD L−1 d−1 was the condition that presented the best results in the 1st phase for the parameters: maximum methane flow rate (MFR) (7.61 LNCH4 d−1), methane yield (MY) (0.30 LNCH4 gCODremoved−1), volumetric methane production rate (VMPR) (2.79 LNCH4 L−1 d−1), COD removal efficiencies (ERTCOD) and soluble COD (ERSCOD) higher than 90%. In the 2nd phase, the reactor was operated with an OLR of 7.1 gCOD L−1 d−1 and a hydraulic retention time (HRT) of 35.22 h and CODinfluent of 10.68 g L−1. The minimum alkalinity supplementation required was 0.28 gNaHCO3gCODinfluent−1, a condition in which the reactor showed stability and satisfactory performance for the parameters: MFR (9.48 LNCH4 d−1), MY (0.33 LNCH4 gCODremoved−1) and VMPR (3.18 LNCH4 L−1 d−1). It was concluded that the ABFSB reactor proved to be stable in the IWL leachate co-digestion and glycerin, when the alkalinity supplementation, effectively necessary, was met.

Keywords: Biodiesel waste; Energy recovery; Industrial landfill; Methane yield (search for similar items in EconPapers)
Date: 2021
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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:164:y:2021:i:c:p:1436-1446

DOI: 10.1016/j.renene.2020.10.100

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