Abstract
The augmentation of biochar produced at 450 and 600–650 °C and hydrochar produced at 250 °C has been investigated using biochemical methane potential experiments of cellulose. The feedstocks used for the char production included the lignocellulosic (oak wood), macroalgae (Fucus serratus) and aquatic plant (water hyacinth). Biomethane production was improved with the addition of lower-temperature biochars from oak wood (285 mL CH4/g VS) and water hyacinth (294 mL CH4/g VS), corresponding to 7 and 11% more than the control. The addition of these two biochars increased the methane production rate of 2.4 and 2.3 times the control, respectively. Higher temperature biochars showed no difference. Conversely, all hydrochars and macroalgae biochars augmentation reduced methane generation by 57–86 %. The chemical and structural composition of each of the chars differed significantly. Surface oxygen functionality appears to be the most important property of the biochars that improved digestion performance.
Highlights
Anaerobic digestion (AD) is a dual purpose technology designed for the sustainable management of waste and the production of renewable energy in the form of biogas
BC is produced by pyrolysis under anoxic or limited oxygen condi tions, whereas HC is produced by hydrothermal carbonisation (HTC) within hot compressed liquid water at elevated autogenous pressure
The oak wood (OW)-BCs were obtained from a commercial pyrolysis plant at 450 and 650 ◦C operated by Proininso (Spain), designated as OW-BC450 and OW-BC650, respectively
Summary
Anaerobic digestion (AD) is a dual purpose technology designed for the sustainable management of waste and the production of renewable energy in the form of biogas. Several strate gies have been proposed for alleviating AD imbalance while improving. Methane yields and production rates, including the use of additives. The addition of carbonaceous materials during AD, such as activated carbon, graphene, carbon nanotubes, biochar (BC) and hydrochar (HC) has gained attention (Zhang et al, 2018). The advantages of using chars, BC and HC, over other adsorbent carbon materials include: their low cost, the potential to use a wide range of biomass feedstocks for their production, their environmental sustain ability, improvement of the digestate, and them having advantageous physicochemical properties that can be further tailored to fulfil desired characteristics (Lee et al, 2017)
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