Enhancing renewable energy production from water hyacinth (Eichhornia crassipes) by a biogas-aerating recirculation system: A case study in the Vietnamese Mekong Delta

Nam, Trần Sỹ; Công, Nguyễn Văn; Thao, Huynh Van

doi:10.1016/j.cscee.2023.100340

Cited by 3 publications

(4 citation statements)

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“…Nutrient removal by WL involves not only eutrophication reduction of surrounding water bodies, but also significant biomass production for renewable energy generation. WL biomass can be used to feed the biogas plant directly or applied as simple bio-pretreatment technologies (soaking in biogas effluent or anoxic mud for a 5-day period) to enhance the biogas yield, as suggested by Nam et al (2021) and Nam, Van Cong & Van Thao (2023) . The co-digestion of WL and PD could solve common issues concerning insufficient animal waste sources for biogas production, because many farms in various localities typically have a smaller standing stock of animals (permanently or temporarily) ( Nam et al, 2017 , 2021 ).…”

Section: Resultsmentioning

confidence: 99%

“…However, the scale of raising livestock of the VMD’s households is modest, leading to a shortage of feedstock substrate for producing biogas ( Nam et al, 2022 ). Accordingly, substitute or additional feedstocks, such as rice straw, water hyacinth, and potential biomass, are encouraged for use as co-substrates for biogas digesters to achieve higher biogas yields ( Nam, Van Cong & Van Thao, 2023 ). The co-digestion of animal waste and biomass provides a more flexible digestion process in small livestock household digesters.…”

Section: Introductionmentioning

confidence: 99%

“…Although water hyacinth is a good candidate for nutrient removal and biomass harvest, its high content of hemicellulose (30.8–48.0%) slows biogas production, resulting in overloading in a long-term operation ( Nam, Van Cong & Van Thao, 2023 ; Lin et al, 2015 ; Bote, Naik & Jagadeeshgouda, 2020 ). The possibility of duckweed biomass production is slight, albeit with high biomethanation potential, resulting in an inadequate substrate for household-scale biogas production.…”

Section: Introductionmentioning

confidence: 99%

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Water lettuce (Pistia stratiotes L.) increases biogas effluent pollutant removal efficacy and proves a positive substrate for renewable energy production

Nguyen Vo Chau,

Huynh Van,

Nguyen Cong

et al. 2023

PeerJ

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Background Aquatic plants play a crucial role in nature-based wastewater treatment and provide a promising substrate for renewable energy production using anaerobic digestion (AD) technology. This study aimed to examine the contaminant removal from AD effluent by water lettuce (WL) and produce biogas from WL biomass co-digested with pig dung (PD) in a farm-scale biogas digester. Methods The first experiment used styrofoam boxes containing husbandry AD effluent. WLs were initially arranged in 50%, 25%, 12.5%, and 0% surface coverage. Each treatment was conducted in five replicates under natural conditions. In the second experiment, WL biomass was co-digested with PD into an existing anaerobic digester to examine biogas production on a farm scale. Results Over 30 days, the treatment efficiency of TSS, BOD5, COD, TKN, and TP in the effluent was 93.75–97.66%, 76.63–82.56%, 76.78–82.89%, 61.75–63.75%, and 89.00–89.57%, respectively. Higher WL coverage increased the pollutant elimination potential. The WL biomass doubled after 12 days for all treatments. In the farm-scale biogas production, the biogas yield varied between 190.6 and 292.9 L kg VSadded−1. The methane content reached over 54%. Conclusions WL removed AD effluent nutrients effectively through a phytoremediation system and generated significant biomass for renewable energy production in a farm-scale model.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Water lettuce (Pistia stratiotes L.) increases biogas effluent pollutant removal efficacy and proves a positive substrate for renewable energy production

Nguyen Vo Chau,

Huynh Van,

Nguyen Cong

et al. 2023

PeerJ

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“…Biogas digestive effluent (BDE) is produced through the anaerobic digestion of livestock wastes or biodegradable materials [5,6]. It is estimated that Vietnam has a total of 500,000 digesters installed to treat approximately 80 Mt year −1 of animal wastes, of which small-scale digesters (<50 m 3 ) account for the largest proportion [7,8].…”

Section: Introductionmentioning

confidence: 99%

Methanotrophic Inoculation Reduces Methane Emissions from Rice Cultivation Supplied with Pig-Livestock Biogas Digestive Effluent

Thao,

Tarao,

Takada

et al. 2024

Agronomy

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Biogas digestive effluent (BDE) is a nutrient-enriched source that can be utilized as an organic fertilizer for rice cultivation without synthetic fertilizer (SF) application. However, a primary concern is the stimulation of methane (CH4) emissions due to the enrichment of the labile organic carbon, a favorite substrate of methanogenic archaea. Methanotrophs potentially reduce greenhouse gas (GHG) emissions from rice fields owing to metabolizing CH4 as a carbon source and energy. We therefore examined the effect of the application of methanotroph-inoculated BDE to the rice cultivated paddy soil on GHG emissions and rice productivity under a pot experiment. Methanotrophs (Methylosinus sp. and Methylocystis sp.), isolated from the Vietnamese Mekong Delta’s rice fields, were separately inoculated to the heated BDE, followed by a 5-day preincubation. Methanotroph-inoculated BDE was supplied to rice cultivation to substitute SF at 50% or 100% in terms of nitrogen amount. The results showed that the total CH4 emissions increased ~34% with the application of BDE. CH4 emissions were significantly reduced by ~17–21% and ~28–44% under the application of methanotroph-inoculated BDE at 100% and 50%, respectively. The reduction in CH4 was commensurate with the augmentation of pmoA transcript copy number under methanotroph-inoculated BDE. In addition, methanotroph-inoculated BDE application did not increase nitrous oxide (N2O) emissions and adversely affect rice growth and grain productivity. This study highlighted the BDE-recirculated feasibility for a lower CH4 emission rice production based on methanotrophs where high CH4-emitting fields were confirmed.

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Experimental analysis of an agricultural diesel engine powered with biogas as green fuel from waste canteen food

Tudu,

Barik,

Chandran

et al. 2024

Energy Science & Engineering

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This proposed study aims to characterize and utilize the biogas (BG) derived from the anaerobic co‐digestion of university hostel food waste and Vinasse (waste from the sugarcane industry) in a digester and to run an agricultural diesel engine with BG and Jatropha Curcas methyl ester (JCMS) on a dual fuel (DF) mode. In DF mode, BG from food waste was the main fuel, and JCMS100 was the pilot (secondary) fuel. The engine was run at different BG flow rates as 4, 8, and 12 liters per minute (LPM) with JCMS100 as injected fuel. As per the author's earlier experimental findings, the fuel injection pressure for the JCMS100 was elevated to 240 bar from the base range of 200 bar to enhance the engine performance. The experimental findings for the JCMS, and BG operation were compared with diesel in all aspects. It was revealed that the NOx emission of JCMS100 + 12 LPM of BG was about 7.5% lower than the D100 fuel at full load. Increasing BG intake up to 8 LPM, the BTE increased, however, afterward it started to decline. In a similar consequence, the brake specific fuel consumption (BSFC) declined up to 8 LPM of BG, however, when the engine was fed with 12 LPM of BG the BSFC started to elevate. The carbon monoxide and hydrocarbon also elevated with higher induction of BG. However, interestingly a NOx‐smoke compromised tradeoff was observed for JCME‐BG operation.

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Enhancing renewable energy production from water hyacinth (Eichhornia crassipes) by a biogas-aerating recirculation system: A case study in the Vietnamese Mekong Delta

Cited by 3 publications

References 45 publications

Water lettuce (Pistia stratiotes L.) increases biogas effluent pollutant removal efficacy and proves a positive substrate for renewable energy production

Water lettuce (Pistia stratiotes L.) increases biogas effluent pollutant removal efficacy and proves a positive substrate for renewable energy production

Methanotrophic Inoculation Reduces Methane Emissions from Rice Cultivation Supplied with Pig-Livestock Biogas Digestive Effluent

Experimental analysis of an agricultural diesel engine powered with biogas as green fuel from waste canteen food

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