Improving the bioenergy production from wheat straw with alkaline pretreatment

Liu, Xiaoying; Zicari, Steven M.; Liu, Guangqing; Li, Yeqing; Zhang, Ruihong

doi:10.1016/j.biosystemseng.2015.09.006

Cited by 28 publications

(22 citation statements)

References 20 publications

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“…reported an increase of soluble COD concentration from the initial concentration of 28 gL −1 to 72 gL −1 after recycling KOH pretreated black liquor 5 times on wheat straw (2% w/v; 20 °C). However, soluble COD concentration reached a plateau of 73–74 gL −1 for the last 5 recycling steps 45 . On comparison, initial soluble COD values in the above study were similar to the values obtained in the present study (20 vs 28 gL −1 ).…”

Section: Resultssupporting

confidence: 90%

“…For instance, methane yields obtained for wheat straw litter materials were reported to be around 218 L CH 4 kg −1 VS added and 255 L CH 4 kg −1 VS added. 45,47 Thermo‐chemical pretreatment improved the methane yields of HM by 39% after one step of pretreatment compared to 225 ± 1 mL CH 4 g −1 VS added obtained for untreated HM. Previously, several studies have shown that NaOH pretreatment was effective and improved the methane yields of lignocellulosic biomass and livestock manures.…”

Section: Resultsmentioning

confidence: 96%

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Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Peyrelasse

Kaparaju

Lallement³

et al. 2021

Biofuels Bioprod Bioref

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In this study, the effect of thermo‐alkaline pretreatment and recycling of the liquid fraction (black liquor) for successive pretreatment steps on chemical composition and methane yields from horse manure was investigated. At first, horse manure was subjected to alkaline pretreatment at 70 °C for 1 h (8.6 g NaOH/100 g total solids). Pretreated biomass was then separated into solid and liquid fractions (black liquor). In the subsequent stages, black liquor was mixed with 20% (v/v) of fresh NaOH and was reused to pretreat subsequent batches of horse manure (cycles 1–4). Chemical analyses showed that thermo‐alkaline pretreatment was effective in the delignification and solubilization of organic matter and thereby increased the holocellulose (cellulose and hemicelluloses) content in the solid fraction of horse manure. On comparison with untreated horse manure methane yields (225 ± 1 L CH4 kg−1 VSadded), thermo‐alkaline pretreatment improved the methane yields of horse manure by 39% (313 ± 16 L CH4 kg−1 VSadded). However, the effectiveness of black liquor recycling on methane production decreased (from 39 to 12%) with an increase in the number of recycling steps (from 1 to 4). Nevertheless, recycling of black liquor reduced the consumption of NaOH (40%) and water use (60%). Thus, thermo‐alkaline pretreatment with liquor recycling was found to be an effective pretreatment with an economic gain of 2.4 to 10.4 compared to pretreatment without recycling. © 2021 Society of Chemical Industry and John Wiley & Sons, Ltd

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Section: Resultssupporting

confidence: 90%

Section: Resultsmentioning

confidence: 96%

Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Peyrelasse

Kaparaju

Lallement³

et al. 2021

Biofuels Bioprod Bioref

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“…The COD and soluble saccharides were the indicators of degradable and solubilized lignin and carbohydrate in pretreatment solution 30 . From Table 3 , the concentration of COD and saccharides followed the same trends.…”

Section: Resultsmentioning

confidence: 99%

“…Moreover, the liquid after NaOH pretreatment could result in serious environment problems such as soil salinization and water pollution 10 . On contrary, the waste liquid containing KOH might have environmental benefits, including the production of fertilizer 10 , 30 . KOH is much more expensive than Ca(OH) 2 and NaOH.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of methane production from Cotton Stalk using different pretreatment techniques

Zhang

Khalid

et al. 2018

Sci Rep

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China produces large amount of cotton stalk (CS) residues as agricultural biomass, which are incinerated on-site, causing air pollution. The high organic content of CS could be utilized for biogas production, but the direct digestion without pretreatment always leads to a low methane yield and biodegradability, due to the complicated structure of lignocellulose. In order to search best fitting pretreatment methods in effective anaerobic digestion (AD) of CS, effects of various pretreatments including KOH, NaOH, Ca(OH)2, alkali hydrogen peroxide (AHP), H2SO4, H3PO4 and steam explosion (SE) were studied. It was seen that all treatments resulted in varying methane yields. Among all the pretreatments, acid pretreatment is not suitable for AD of CS. The results showed that the highest cumulative methane yield (CMY) of 192.4 mL·gVS−1 was obtained after 3% AHP pretreatment of CS, and the methane yield improved by 254.3% than the untreated CS. Therefore, AHP treatment was proven to be an efficient pretreatment technique. XRD and FTIR analyses had shown that pretreated CS had favorable structural changes. This research is beneficial in developing environment friendly and cost-effective pretreatment technologies to utilize CS for methane production in future application.

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“…Although, there is still discrepancy on the choice of alkaline reagent, in terms of the greatest advantages, considering the cost of the reagent, performance, and manipulation [91], sodium hydroxide is preferred because it catalyzes under mild conditions, effectively attacks the linkage between lignin and hemicellulose in lignin-carbohydrate; in particular it cleaves the ether and ester bonds in the lignocellulose structure and also effective in the cleavage of the ester and carbon-to-carbon bonds in lignin molecules [92][93][94]. Jiang et al [22] and Xihui et al [95] optimized the NaOH loading rate to increase the methane yield.…”

Section: Alkalinementioning

confidence: 99%

Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

et al. 2019

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Lignocellulosic biomass is recalcitrant due to its heterogeneous structure, which is one of the major limitations for its use as a feedstock for methane production. Although different pretreatment methods are being used, intermediaries formed are known to show adverse effect on microorganisms involved in methane formation. This review, apart from highlighting the efficiency and limitations of the different pretreatment methods from engineering, chemical, and biochemical point of views, will discuss the strategies to increase the carbon recovery in the form of methane by way of amending pretreatments to lower inhibitory effects on microbial groups and by optimizing process conditions.

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Improving the bioenergy production from wheat straw with alkaline pretreatment

Cited by 28 publications

References 20 publications

Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Reduction of the environmental footprint of thermo‐alkali pretreatment by reusing black liquor during anaerobic digestion of lignocellulosic biomasses

Enhancement of methane production from Cotton Stalk using different pretreatment techniques

Insight into Pretreatment Methods of Lignocellulosic Biomass to Increase Biogas Yield: Current State, Challenges, and Opportunities

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