Enhanced energy recovery via separate hydrogen and methane production from two-stage anaerobic digestion of food waste with nanobubble water supplementation

Hou, Tingting; Zhao, Jiamin; Lei, Zhongfang; Shimizu, Kazuya; Zhang, Zhenya

doi:10.1016/j.scitotenv.2020.143234

Cited by 35 publications

(7 citation statements)

References 50 publications

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“…The low hydrogen production was attributed to acidification caused by substrate overloading 28 . The highest cumulative hydrogen production obtained in this study was 102.79 mL g −1 VS, within the range of 17.30–217.97 mL g −1 VS recorded in recent studies 29‐32 …”

Section: Resultssupporting

confidence: 71%

Optimization of food‐to‐microorganism ratio and addition of Tween 80 to enhance biohythane production via two‐stage anaerobic digestion of food waste

Chen

Song

et al. 2023

J of Chemical Tech & Biotech

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BACKGROUNDFood waste (FW) is easily acidified to produce acid inhibition, which limits the treatment efficiency of anaerobic digestion (AD). To improve the AD efficiency of FW, two‐stage anaerobic digestion (TSAD) technique was used to test the effect of food‐to‐microorganism (F/M) ratio on hydrogen production and the effect of Tween 80 addition on methane production. Changes in volatile fatty acids during FW TSAD were analyzed. Furthermore, the energy recovery of different TSAD conditions was compared.RESULTSUnder the condition of F/M = 10, hydrogen production of FW was the highest (102.79 mL g−1 volatile solids (VS)). In the methanogenesis stage of FW, the methane production of different conditions was 351.97–407.11 mL g−1 VS. Kinetic analysis showed that the hydrogen production could be increased by appropriately increasing the F/M ratios, and the time required to reach 90% methane production (t90) in the methanogenesis stage could be shortened by adding Tween 80. Analysis of energy recovery showed that the energy yield of TSAD was 13.01–15.68 kJ g−1 VS, and the average daily energy recovery of hydrogen production stage F/M = 10, methane production stage with 0.1% Tween 80 (A‐10 and M‐10 T) were the highest at t90, which was 9.23 and 4.60 kJ d−1.CONCLUSIONF/M ratio affects hydrogen production, and a suitable F/M ratio can improve the hydrogen production of the TSAD of FW. The addition of Tween 80 can shorten the t90 of the methanogenesis stage. Analysis of energy recovery calculation showed that A‐10 + M‐10 T was more economically rational for TSAD. © 2023 Society of Chemical Industry.

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Section: Resultssupporting

confidence: 71%

Optimization of food‐to‐microorganism ratio and addition of Tween 80 to enhance biohythane production via two‐stage anaerobic digestion of food waste

Chen

Song

et al. 2023

J of Chemical Tech & Biotech

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“…The effluent discharged after biohydrogen production from the co-digestion of microalgae with organic wastes, including molasses, Napier grass ( Pennisetum purpureum ), empty fruit bunches (EFB), palm oil mill effluent (POME), and glycerol waste gave the highest MY of 214–577 mL/g-VS [ 5 ]. Hou et al [ 10 ] found that methane production (14.96 kJ/g-VS added ) from hydrogenic effluent of food waste supplemented with air-nanobubble water resulted in a high total energy yield (EY) of 15.31 kJ/g-VS added , which is 43.7 times greater than that of hydrogen production (0.35 kJ/g-VS added ). These results demonstrate that methane production from hydrogenic effluent significantly improved the total EY.…”

Section: Introductionmentioning

confidence: 99%

Co-generation of biohydrogen and biochemicals from co-digestion of Chlorella sp. biomass hydrolysate with sugarcane leaf hydrolysate in an integrated circular biorefinery concept

Sitthikitpanya

Sittijunda

Khamtib³

et al. 2021

Biotechnol Biofuels

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Background A platform for the utilization of the Chlorella sp. biomass and sugarcane leaves to produce multiple products (biorefinery concept) including hydrogen, methane, polyhydroxyalkanoates (PHAs), lipid, and soil supplement with the goal to achieve the zero waste generation (circular economy) is demonstrated in this study. Microalgal biomass were hydrolyzed by mixed enzymes while sugarcane leaves were pretreated with alkali followed by enzyme. Hydrolysates were used to produce hydrogen and the hydrogenic effluent was used to produce multi-products. Solid residues at the end of hydrogen fermentation and the remaining acidified slurries from methane production were evaluated for the compost properties. Results The maximum hydrogen yield of 207.65 mL-H2/g-volatile solid (VS)added was obtained from 0.92, 15.27, and 3.82 g-VS/L of Chlorella sp. biomass hydrolysate, sugarcane leaf hydrolysate, and anaerobic sludge, respectively. Hydrogenic effluent produced 321.1 mL/g-VS of methane yield, 2.01 g/L PHAs concentration, and 0.20 g/L of lipid concentration. Solid residues and the acidified slurries at the end of the hydrogen and methane production process were proved to have compost properties. Conclusion Hydrogen production followed by methane, PHA and lipid productions is a successful integrated circular biorefinery platform to efficiently utilize the hydrolysates of Chlorella sp. biomass and sugarcane leaf. The potential use of the solid residues at the end of hydrogen fermentation and the remaining acidified slurries from methane production as soil supplements demonstrates the zero waste concept. The approach revealed in this study provides a foundation for the optimal use of feedstock, resulting in zero waste. Graphic Abstract

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“…Interestingly, both air- and O 2 -NBs decreased the cellulose crystallinity, thereby ameliorating the hydrolysis and the acidogenesis of cellulose in AD, which is likely due to the establishment of a microaerobic environment in the digestor. , The microaerobic environment further favors efficient electron transport and reduces the VFAs through enhanced facultative bacterial activity . A recent study also demonstrated that air-NBs potentiated the enzymatic activity involved in both the hydrolysis/acidification and methanogenesis stages (including alkaline phosphatase, acid phosphatase, α-glucosidase, protease, coenzyme F420, and cellulase) as compared to the control group (without any NBs in deionized water) during AD of food waste …”

Section: Applications Of Mbs and Nbs In Wastewater Treatmentmentioning

confidence: 93%

“…111 A recent study also demonstrated that air-NBs potentiated the enzymatic activity involved in both the hydrolysis/acidification and methanogenesis stages (including alkaline phosphatase, acid phosphatase, α-glucosidase, protease, coenzyme F420, and cellulase) as compared to the control group (without any NBs in deionized water) during AD of food waste. 121 Furthermore, besides enhancing the activity of functional enzymes, air-and CO 2 -NBs also shaped the microbial communities (both bacteria and archaea) in the digestor. 115 O 2 -NBs enriched the facultative hydrolytic and acidogenic bacteria (e.g., phyla Bacteroidetes and Firmicutes) and hydrogenotrophic and acetoclastic methanogens (e.g., genera Methanosaeta and Methanobacterium) during AD, thereby improving CH 4 production and shortening the lag-phase in the AD process.…”

Section: Anaerobic Digestionmentioning

confidence: 99%

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

et al. 2022

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Microbubbles (MBs) and nanobubbles (NBs) refer to bubbles of micrometer to nanometer sizes. Due to several unique attributes, including long-term stability, negative surface charge, and the ability to generate reactive oxygen species, MB and NB technology has garnered significant attention in water and wastewater treatment and ecological restoration. Recently, several studies have shown the beneficial effects of MBs and NBs in membrane defouling, pathogen deactivation, environmental remediation, etc. However, there is limited knowledge of the physical and biochemical interactions between MBs and NBs and microbial communities; the mechanistic roles of MBs and NBs on micropollutants removal during aerobic wastewater treatment and anaerobic digestion; and the engineering limitations on versatility and scalability of MB and NB technology, among others. This review fills this gap by providing a systematic discussion on the fundamentals of MBs and NBs, including their size and concentration, physicochemical properties, and generation methods. The latest advances on MB and NB applications to water and wastewater treatment and ecological restoration are then critically discussed. The review thus identifies the challenges of implementing MB and NB technology and concludes with future research directions for a broader understanding of MB and NB technology.

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Enhanced energy recovery via separate hydrogen and methane production from two-stage anaerobic digestion of food waste with nanobubble water supplementation

Cited by 35 publications

References 50 publications

Optimization of food‐to‐microorganism ratio and addition of Tween 80 to enhance biohythane production via two‐stage anaerobic digestion of food waste

Optimization of food‐to‐microorganism ratio and addition of Tween 80 to enhance biohythane production via two‐stage anaerobic digestion of food waste

Co-generation of biohydrogen and biochemicals from co-digestion of Chlorella sp. biomass hydrolysate with sugarcane leaf hydrolysate in an integrated circular biorefinery concept

Untapped Potential: Applying Microbubble and Nanobubble Technology in Water and Wastewater Treatment and Ecological Restoration

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