scholarly journals Improvement of Anaerobic Digestion of Lignocellulosic Biomass by Hydrothermal Pretreatment

2019 ◽  
Vol 9 (18) ◽  
pp. 3853 ◽  
Author(s):  
Banafsha Ahmed ◽  
Kaoutar Aboudi ◽  
Vinay Kumar Tyagi ◽  
Carlos José Álvarez-Gallego ◽  
Luis Alberto Fernández-Güelfo ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Lignocellulosic Biomass ◽  
Hydrothermal Process ◽  
Genetically Engineered ◽  
Hydrothermal Pretreatment ◽  
Economic Feasibility ◽  
Process Performance ◽  
Genetically Engineered Microbes ◽  
Pre Treatment ◽  
Detoxification Process

Lignocellulosic biomass, comprising of cellulose, hemicellulose, and lignin, is a difficult-to-degrade substrate when subjected to anaerobic digestion. Hydrothermal pretreatment of lignocellulosic biomass could enhance the process performance by increasing the generation of methane, hydrogen, and bioethanol. The recalcitrants (furfurals, and 5-HMF) could be formed at high temperatures during hydrothermal pretreatment of lignocellulosic biomass, which may hinder the process performance. However, the detoxification process involving the use of genetically engineered microbes may be a promising option to reduce the toxic effects of inhibitors. The key challenge lies in the scaleup of the hydrothermal process, mainly due to necessity of upholding high temperature in sizeable reactors, which may demand high capital and operational costs. Thus, more efforts should be towards the techno-economic feasibility of hydrothermal pre-treatment at full scale.

A novel enrichment approach for anaerobic digestion of lignocellulosic biomass: Process performance enhancement through an inoculum habitat selection

2020 ◽  
Vol 313 ◽  
pp. 123703 ◽  
Author(s):  
Alberto Ferraro ◽  
Giulia Massini ◽  
Valentina Mazzurco Miritana ◽  
Silvia Rosa ◽  
Antonella Signorini ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Habitat Selection ◽  
Lignocellulosic Biomass ◽  
Performance Enhancement ◽  
Process Performance

scholarly journals Temperature, Solid Loading and Time Effects on Recovery of Sugar from OPEFB

2018 ◽  
Vol 156 ◽  
pp. 03022 ◽  
Author(s):  
Diah Meilany ◽  
MTAP Kresnowati ◽  
Tjandra Setiadi
Keyword(s):  
Lignocellulosic Biomass ◽  
Treatment Process ◽  
Hydrothermal Process ◽  
Raw Material ◽  
Effect Of Temperature ◽  
Solid Loading ◽  
Time Effects ◽  
Glucose Recovery ◽  
Pre Treatment ◽  
Main Component

Biorefinery industry used lignocellulosic biomass as the raw material. Oil Palm Empty Fruit Bunch (OPEFB) is one of Indonesian potential lignocellulosic biomass, which consists of hemicellulose with xylan as the main component. Xylitol production via fermentation could use this xylan since it can be converted into xylose. However, the structure of OPEFB is such that hemicellulose is protected in a way that will hinder hydrolysis enzyme to access it. Considering that hemicellulose is more susceptible to heat than cellulose, a hydrothermal process was applied to pre-treat OPEFB before it was hydrolyzed enzymatically. The aim of the research is to map the effect of temperature, solid loading and time of pre-treatment process to obtain and recover as much as possible accessible hemicellulose from OPEFB. The results showed that temperature gave more significant effect than time and solid loading for glucose recovery of OPEFB residues. While xylose recovery varies greatly with temperature, but solid loading and time gave less significant effect.

scholarly journals The effect of A. Fumigatus SK1 and trichoderma sp. on the biogas production from cow manure

2018 ◽  
Vol 14 (3) ◽  
pp. 353-359 ◽  
Author(s):  
Zulfah Zulkifli ◽  
Nazaitulshila Rasit ◽  
Noor Azrimi Umor ◽  
Shahrul Ismail
Keyword(s):  
Anaerobic Digestion ◽  
Lignocellulosic Biomass ◽  
Biogas Production ◽  
Reducing Sugar ◽  
Treatment Result ◽  
Cow Manure ◽  
Lignin Removal ◽  
Trichoderma Sp ◽  
Working Volume ◽  
Pre Treatment

Lignocellulosic material consists of lignin, cellulose and hemicellulose. Converting lignocellulosic biomass such as cow manure (CM) into value-added products provides a potential alternative. Hydrolysis of cellulose and hemicellulose is a limiting step during Anaerobic Digestion (AD) of lignocellulosic biomass. Lignin in lignocellulosic biomass is the barrier for hydrolysis, thus limits the biogas production. In this study, the effect of A.Fumigatus SK1 and Trichoderma sp. on enzymatic pre-treatment of CM was investigated with respect to the biogas production. Three set of anaerobic digestion assays were carried out, with a working volume of 500 mL at 35 ± 2°C and 120 rpm. The first set of fermentation contained untreated CM. The second set of fermentation involved addition of A.Fumigatus SK1, and the last set contained Trichoderma sp. Several analysis were conducted to determine the biomethane potential (BMP), anaerobic biodegradability, reducing sugars concentration and lignin removal of CM before and after pre-treatment. Result showed that, among both evaluated pre-treatment methods, CM treated with Trichoderma sp. gave the highest methane potential with 0.023 LCH4-STP g VS-1 compared to CM treated with A.Fumigatus SK1(0.011 LCH4-STP g VS-1). A good correlation have been found in this study between lignin removal and reducing sugar produced where, the total lignin removal after treated with Trichoderma sp. was 60% followed by 43% after treated with A.Fumigatus SK1.The reducing sugar produced after pre-treated with Trichoderma sp. and A.Fumigatus SK1 was about 9.59 and 4.91 μmol glucose, respectively. These results collectively suggested that CM treated with Trichoderma sp. could be a better pre-treatment method for the higher methane production in anaerobic mono-digestion process.

scholarly journals Potential benefits of near critical and supercritical pre-treatment of lignocellulosic biomass towards anaerobic digestion

2018 ◽  
Vol 37 (1) ◽  
pp. 74-82 ◽  
Author(s):  
Jenny Carolina Rosero-Henao ◽  
Beatriz Egerland Bueno ◽  
Raquel de Souza ◽  
Rogers Ribeiro ◽  
Alessandra Lopes de Oliveira ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Lignocellulosic Biomass ◽  
Potential Benefits ◽  
Pre Treatment

Process performance and change in sludge characteristics during anaerobic digestion of sewage sludge with ozonation

2004 ◽  
Vol 49 (10) ◽  
pp. 105-113 ◽  
Author(s):  
R. Goel ◽  
K. Komatsu ◽  
H. Yasui ◽  
H. Harada
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Unit Cost ◽  
Economic Feasibility ◽  
Municipal Sewage Sludge ◽  
Process Performance ◽  
Solid Concentration ◽  
Digested Sludge ◽  
New Process ◽  
Inorganic Content

A new process configuration combining anaerobic digestion with ozonation, and operated at long SRT, was studied with the objective of on-site reduction in sludge quantity and improving biogas recovery. The process performance with respect to solid reduction efficiency and other important process parameters like accumulation of inorganic solids, changes in sludge viscosity and dewatering characteristics were evaluated from the data of long term pilot scale continuous experiments conducted using a mixture of primary and secondary municipal sewage sludge. Due to sludge ozonation and long SRT, high VSS degradation efficiency of approximately 80% was achieved at a reactor solid concentration of 6.5%. A high fraction of inorganic solid (>50%) consisting mainly of acid insoluble and iron compounds was found to accumulate in the reactor. The high inorganic content accumulated in the digested sludge did not, however, contribute to the observed increase in sludge viscosity at high solid concentration. The sludge viscosity was largely found to depend on the organic solid concentration rather than the total solid content. Moreover, higher inorganic content in the digested sludge resulted in better sludge dewaterability. For a quick assessment of the economic feasibility of the new process, an economic index based on the unit cost of digested sludge disposal to unit electric cost is proposed.

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