Coupling hydrothermal liquefaction and anaerobic digestion for energy valorization from model biomass feedstocks

Posmanik, Roy; Labatut, Rodrigo A.; Kim, Andrew; Usack, Joseph G.; Tester, Jefferson W.; Angenent, Largus T.

doi:10.1016/j.biortech.2017.02.095

Cited by 164 publications

(72 citation statements)

References 47 publications

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“…9), and they were lower than that reported in a previous study where the energy recovery as high as 50% was obtained [36]. It could be due to the fact that relatively lower percentages of organic components were transferred to aqueous phase for HTL of rice straw in the present study (between 12.11 and 29.42% in COD value as shown in Table 1).…”

Section: Discussioncontrasting

confidence: 70%

“…1. It was also demonstrated that the anaerobic biodegradability of HTLWW was lower when the temperature of hydrothermal processing increased although the biomass for HTL was quite different [36]. Insufficient conversion indicating recalcitrant organics was present in all HTLWW samples, especially the samples obtained at high HTL temperature (e.g., 320 °C).…”

Section: Discussionmentioning

confidence: 99%

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Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Chen

Zhang

Rao

et al. 2017

Biotechnol Biofuels

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BackgroundHydrothermal liquefaction (HTL) has been well studied for the bio-oil production from biomass. However, a large amount of wastewater with high organic content is also produced during the HTL process. Therefore, the present study investigated the methane potentials of hydrothermal liquefaction wastewater (HTLWW) obtained from HTL of rice straw at different temperatures (170–320 °C) and residence times (0.5–4 h). The characteristics (e.g., total organic content, organic species, molecular size distribution, etc.) of the HTLWW were studied, and at the same time, microbial community compositions involved in AD of HTLWW were analyzed.ResultsThe highest methane yield of 314 mL CH4/g COD was obtained from the sample 200 °C–0.5 h (HTL temperature at 200 °C for 0.5 h), while the lowest methane yield 217 mL CH4/g COD was obtained from the sample 320 °C–0.5 h. These results were consistent with the higher amounts of hard biodegradable organics (furans, phenols, etc.) and lower amounts of easily biodegradable organics (sugars and volatile fatty acids) present in sample 320 °C–0.5 h compared to sample 200 °C–0.5 h. Size distribution analysis showed that sample 320 °C–0.5 h contained more organics with molecular size less than 1 kDa (79.5%) compared to sample 200 °C–0.5 h (66.2%). Further studies showed that hard biodegradable organics were present in the organics with molecular size higher than 1 kDa for sample 200 °C–0.5 h. In contrast, those organics were present in both the organics with molecular size higher and less than 1 kDa for sample 320 °C–0.5 h. Microbial community analysis showed that different microbial community compositions were established during the AD with different HTLWW samples due to the different organic compositions. For instance, Petrimonas, which could degrade sugars, had higher abundance in the AD of sample 200 °C–0.5 h (20%) compared to sample 320 °C–0.5 h (7%). The higher abundance of Petrimonas was consistent with the higher content of sugars in sample 200 °C–0.5 h. The higher Petrimonas abundance was consistent with the higher content of sugars in sample 200 °C–0.5 h. The genus Syntrophorhabdus could degrade phenols and its enrichment in the AD of sample 320 °C–0.5 h might be related with the highest content of phenols in the HTLWW.ConclusionsHTL parameters like temperature and residence time affected the biodegradability of HTLWW obtained from HTL of rice straw. More hard biodegradable organics were produced with the increase of HTL temperature. The microbial community compositions during the AD were also affected by the different organic compositions in HTLWW samples.Electronic supplementary materialThe online version of this article (doi:10.1186/s13068-017-0830-0) contains supplementary material, which is available to authorized users.

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Section: Discussioncontrasting

confidence: 70%

Section: Discussionmentioning

confidence: 99%

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Chen

Zhang

Rao

et al. 2017

Biotechnol Biofuels

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“…Here, combining hydrothermal liquefaction and anaerobic digestion may yield a higher energetic return by converting the food waste (or other feed stocks) into oil and biogas and further recovery of resources (digestate). Hydrothermal liquefaction converts waste into oil and a carbon-rich aqueous phase that can be converted to biogas via AD (Gerber Van Doren et al, 2017;Posmanik et al, 2017). A mixture of polysaccharides, proteins and lipids, representing food waste, underwent hydrothermal processing at temperatures ranging from 200 to 350°C.…”

Section: Discussionmentioning

confidence: 99%

“…It was shown that the anaerobic biodegradability of the hydrothermal aqueous phase was lower when the temperature of hydrothermal processing increased and the chemical composition of the hydrothermal aqueous phase affected the anaerobic biodegradability. However, no inhibition of biodegradation was observed for most samples (Gerber Van Doren et al, 2017;Posmanik et al, 2017). A proper analysis of all carbon flows is essential as a design tool for process integration as it may provide a good estimation for resource recovery based on the final product that is targeted (oil or biomethane), the system thermal capabilities and feedstock composition.…”

Section: Discussionmentioning

confidence: 99%

Biogas

Plugge

2017

Microbial Biotechnology

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“…The tight structure created by the hydrogen bonds results in cellulose being highly insoluble in most solvents, but it becomes partially soluble in water at 302 °C and is completely soluble at 330 °C under subcritical conditions [12].…”

Section: ) Cellulosementioning

confidence: 99%

Effect of Operating Parameters on Hydrothermal Liquefaction of Sugarcane Bagasse

Rensburg¹,

Kruger²,

Marx³

2018

ASETH-18,ACABES-18 &Amp; EBHSSS-18 Nov. 19-20 2018 Cape Town (South Africa)

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Hydrothermal liquefaction (HTL) is a thermochemical process that produces various products from lignocellulosic feedstocks. In this study sugar cane bagasse was used as feedstock for HTL. Experiments were carried out in a batch reactor, at varying operating conditions to investigate the effect on the product yields and product composition. The reactor temperature, heating rate, and retention time were varied, while the volume loading of the reactor and feedstock to water ratio were kept constant. Nitrogen was used to pressurize the reactor for all experiments. It was found that none of the operating conditions have a significant effect on the parameters studied.

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Coupling hydrothermal liquefaction and anaerobic digestion for energy valorization from model biomass feedstocks

Cited by 164 publications

References 47 publications

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Methane potentials of wastewater generated from hydrothermal liquefaction of rice straw: focusing on the wastewater characteristics and microbial community compositions

Biogas

Effect of Operating Parameters on Hydrothermal Liquefaction of Sugarcane Bagasse

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