Methane enhancement through oxidative cleavage and alkali solubilization pre-treatments for corn stover with anaerobic activated sludge

Hassan, Muhammad; Ding, Weimin; Bi, Jun; Mehryar, Esmaeil; Talha, Zahir; Huang, Hongying

doi:10.1016/j.biortech.2015.09.115

Cited by 47 publications

(65 citation statements)

References 30 publications

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“…Various pretreatments (e.g., thermal, chemical, biological, and mechanical methods or various combinations of these methods) have been employed to break down the lignin structure to a certain extent and promote the hydrolysis of organic matter in the substrate [8][9][10][11][12][13][14][15][16]. However, some pretreatment methods generate high costs due to the high consumption of energy and chemicals (biological agents) needed for maintaining the normal fermentation conditions, as well as byproducts that are not biodegradable, making the subsequent treatment of the biogas slurry more difficult and making the method impractical for biogas production [11].…”

Section: Introductionmentioning

confidence: 99%

Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Zhang

et al. 2019

Energies

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To solve the difficulty of lignocellulose hydrolysis and the formation of crusted scum in anaerobic fermentation, various parts of corn stover, i.e., pith, rind and leaf, were subjected to a two-phase processing including aerobic hydrolysis (AH) and anaerobic fermentation. The results showed that AH significantly broke down the lignin structure of the various components of corn stover and increased the rate of lignin degradation. After 16 h of AH, the lignin degradation rates of the pith, rind and leaf were 4.20%, 3.91% and 4.90%, respectively, and the acetic acid produced accounted for more than 60% of the total amount of volatile fatty acids (VFAs) and ethanol. After hydrolyzing the pith and rind for 12 h and the leaf for 8 h, the maximum methane yields of fresh mass volatile solid (VS) were 323 ml g-1, 251 ml g-1 and 264 ml g-1, respectively, which were increased by 35.02%, 30.05% and 8%, respectively, while the fermentation cycle of T90 (90% of the total gas production) was shortened by 4-5 days. After hydrolyzing the rind and leaf for 12 h and the pith for 16 h, the thicknesses of the scum layer were only 7.1%, 13.6% and 18%, respectively, of that of the untreated group, indicating that AH coupled with anaerobic fermentation can effectively degrade lignin, reduce the thickness of the scum layer and increase the methane yield.

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Section: Introductionmentioning

confidence: 99%

Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Zhang

et al. 2019

Energies

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“…Among all chemically pretreated CRs, the CR treated with H 2 O 2 and NaOH for 1 h, followed by a mesophilic batch AD process, produced 66.27% and 57.18% more biomethane, respectively, than untreated CR of 187 L kg −1 VS biomethane. All other chemically treated CRs produced lower biomethane than these two, but 23-43% hemicellulose and 24-45% lignin were removed in these chemical pretreatments [40], which is a significant mass loss of the AD substrate. Steam explosion at 250 • C and 1.2 MPa for 10 min produced 55% more methane than untreated CR of 144 L kg −1 VS as the maximum whereas 1.5% KOH treated CR produced 45% more methane.…”

Section: Introductionmentioning

confidence: 91%

Mechanical and Alkaline Hydrothermal Treated Corn Residue Conversion in to Bioenergy and Biofertilizer: A Resource Recovery Concept

2018

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In this research fall time harvested corn residue (CR) was first mechanically pretreated to produce 5 mm chopped and <500 µm ground particles, which underwent an anaerobic digestion (AD) process to produce biomethane and biofertilizer. Another sample of CR was pretreated by an alkaline hydrothermal (HT) process using 1%, 2% and 3% NaOH to produce solid biocarbon and the resulting alkaline hydrothermal process water (AHTPW), a co-product of biocarbon, underwent fast digestion under AD conditions to produce biomethane and biofertilizer. A predetermined HT process of 240 °C for 30 min was considered and the effect of alkali content on the HT process for biocarbon and biomethane product a rate of 8.21 MJ kg−1 and 9.23 MJ kg−1 of raw CR, respectively. Among the three selected alkaline HT processes, the 1% NaOH HT process produced the highest hybrid bioenergy of 11.39 MJ kg−1 of raw CR with an overall energy recovery of 62.82% of raw CR. The AHTPW of 2% and 3% NaOH HT-treated CR did not produce considerable amount of biomethane and their biocarbons contained 3.44 MJ kg−1 and 3.27 MJ kg−1 of raw CR of bioenergy, respectively. The biomethane produced from 5 mm chopped CR, <500 µm ground CR and 1% alkaline AHTPW for 30 days retention time were of 275.38 L kg−1 volatile solid (VS), 309.59 L kg−1 VS and 278.70 L kg−1 VS, respectively, compared to non-treated CR of 144–187 L kg−1 VS. Nutrient enriched AD digestate is useable as liquid fertilizer. Biocarbon, biomethane and biofertilizer produced from the 1% alkaline HT process at 240 °C for 30 min can reduce the greenhouse gas (GHG) emissions of Ontario.

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“…The application of an alkali pre-treatment leads several advantages and disadvantages. On one hand promotes a high pH on feed mixtures, avoiding the anaerobic digester acidification (Reilly et al, 2015) are more effective on lignin removal (Ravidran and Jaiswal, 2016;Hassan et al, 2016), effective for the removal of hemicelluloses (Sun et al, 2016), causing less sugar degradation (Rabemanolontsoa and Saka, 2016). An important drawback of alkali treatments are the needing of applying high temperature to promote the hydrolysis which increases energy demand and removes part of hemicellulose, causing sugar loss (Rabemanolontsoa and Saka, 2016).…”

Section: Introductionmentioning

confidence: 99%

“…Comparing different pre-treatments, the most effective is thermos-chemical procedures once they are easy and shorter time processing, increasing the biogas yield with lower energy consumption, promoting economic feasibility and higher bioconversion yields (Peces et al, 2015;Harris and McCabe, 2015;Hassan et al, 2016). Sodium hydroxide is the most popular base used in alkaline pre-treatment to remove lignin, hemicellulose, and/or cellulose, rendering lignocellulosic biomass more degradable to microbes and enzymes and has been extensively studied to improve biogas yield by increasing hardwood digestibility from 14 to 55% and reducing lignin content from 24e55% to 20% (Kumar et al, 2009;Minmunin et al, 2015).…”

Section: Introductionmentioning

confidence: 99%

Water-energy nexus: Anaerobic co-digestion with elephant grass hydrolyzate

Carvalho

Fragoso

Gominho

et al. 2016

Journal of Environmental Management

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Methane enhancement through oxidative cleavage and alkali solubilization pre-treatments for corn stover with anaerobic activated sludge

Cited by 47 publications

References 30 publications

Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Effect of Aerobic Hydrolysis on Anaerobic Fermentation Characteristics of Various Parts of Corn Stover and the Scum Layer

Mechanical and Alkaline Hydrothermal Treated Corn Residue Conversion in to Bioenergy and Biofertilizer: A Resource Recovery Concept

Water-energy nexus: Anaerobic co-digestion with elephant grass hydrolyzate

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