Bioconversion of paper mill sludge to bioethanol in the presence of accelerants or hydrogen peroxide pretreatment

Gurram, Raghu N.; Al-Shannag, Mohammad; Lecher, Nicholas Joshua; Duncan, Shona M.; Singsaas, Eric L.; Alkasrawi, Malek

doi:10.1016/j.biortech.2015.06.010

Cited by 95 publications

(64 citation statements)

References 30 publications

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“…To make cellulosic ethanol feasible in the market, ethanol production must be at least 76.5 g/L, which requires an initial sugar concentration higher than 150 g/L (Gurram et al 2015). In this experiment, pulp concentrations of 10%, 15%, and 20% were compared; sugar production increased Hu et al (2016).…”

Section: Effects Of Pulp Concentration On Enzymatic Hydrolysismentioning

confidence: 96%

Optimization and Scale-Up of Enzymatic Hydrolysis of Wood Pulp for Cellulosic Sugar Production

Hu¹,

Zhu²,

Fang³

et al. 2016

BioResources

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With the decreased demand for pulp and paper worldwide, the reorganization of pulp and paper mills for cellulosic sugar production is possible. To maximize cellulosic sugar production from the wood pulp with minimum resources, the effects of pH, buffer system, temperature, enzyme loadings, pulp concentrations, and mixing modes on enzymatic hydrolysis were investigated, one factor at a time. Temperature played an important role in enzymatic hydrolysis. When the temperature was lower than 45 °C, the sugar production declined dramatically to almost half of the maximum value. Increasing enzyme dosage, increasing pulp concentration, and adding xylanase increased sugar production. The intermittent manual mixing mode generated higher concentrations of sugars and could be used for large-scale production. At pilot-scale, the diverted pulp for the pulping process was directly hydrolyzed without any treatment, and the residue after hydrolysis was hydrolyzed by adding fresh enzymes. This study provides insight on economically feasible enzymatic hydrolysis of wood pulp at large-scale cellulosic sugar production.

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Section: Effects Of Pulp Concentration On Enzymatic Hydrolysismentioning

confidence: 96%

Optimization and Scale-Up of Enzymatic Hydrolysis of Wood Pulp for Cellulosic Sugar Production

Hu¹,

Zhu²,

Fang³

et al. 2016

BioResources

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“…CaCO 3 increases pH value of primary sludge (8-10), which is higher than the optimum pH for cellulase activity ($5). Acid pretreatments have been used, in SHF and SSF processes, to neutralize CaCO 3 (Fan and Lynd, 2007;Marques et al, 2008;Li et al, 2009;Kang et al, 2010;Wang et al, 2011;Mendes et al, 2014;Gurram et al, 2015). However, the chemical pretreatment with acids releases CO 2 , an environmental inconvenience in the process.…”

Section: Introductionmentioning

confidence: 99%

Integrated bioconversion of pulp and paper primary sludge to second generation bioethanol using Saccharomyces cerevisiae ATCC 26602

Mendes

Cruz

Reis

et al. 2016

Bioresource Technology

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Primary sludge, from different pulp and paper mills, was used as feedstock in simultaneous saccharification and fermentation (SSF) processes to produce ethanol. SSF was carried out with Saccharomyces cerevisiae ATCC 26602 yeast and NS 22192 enzymatic extract using 150gL(-1) of carbohydrates (CH) from primary sludge. The effect of sterilization, reduction of enzyme dosage and fed-batch vs. batch conditions were studied. The removal of sterilization can be considered since no contamination or atypical by-products were observed, although SSF efficiency slightly decreased. The reduction of the enzyme dosage from 35 to 15FPUgCH(-1) was successful. Despite of initial mixing difficulties, batch SSF enabled higher ethanol concentration (41.7gL(-1)), conversion yield (48.9%) and productivity (0.78gL(-1)h(-1)), compared to the fed-batch process at the same conditions of low enzyme dosage of 5FPUgCH(-1) and high solids content of 21.7%, rarely found in literature.

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“…The major challenge of using PPMS for bioethanol production is the high content in ash, namely CaCO 3 , which adsorbs to the enzymes and increases de pH of the sludge, hindering enzymatic hydrolysis. In order to surpass this limitation, acidic treatments are frequently used to neutralize CaCO 3 [161,[167][168][169]. Moreover, the high ash content limits solid loading, leading to bigger reaction vessels, and, consequently, to increased costs.…”

Section: Bioethanol Productionmentioning

confidence: 99%

“…Also, the sludge with higher ash content led to better fermentation results [170]. Gurram et al (2015) tested chemical, with HCl, and mechanical de-ashing of primary sludge, and found that the enzymatic hydrolysis performance improved in de-ashed sludges. The authors also investigated batch SHF of different primary sludges, either chemically de-ashed or without de-ashing, when two different accelerants or H 2 O 2 pretreatment were applied to enzymatic hydrolysis.…”

Section: Type Of Ppms Fermentationmentioning

confidence: 99%

Second Generation Bioethanol Production: On the Use of Pulp and Paper Industry Wastes as Feedstock

2018

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Due to the health and environment impacts of fossil fuels utilization, biofuels have been investigated as a potential alternative renewable source of energy. Bioethanol is currently the most produced biofuel, mainly of first generation, resulting in food-fuel competition. Second generation bioethanol is produced from lignocellulosic biomass, but a costly and difficult pretreatment is required. The pulp and paper industry has the biggest income of biomass for non-food-chain production, and, simultaneously generates a high amount of residues. According to the circular economy model, these residues, rich in monosaccharides, or even in polysaccharides besides lignin, can be utilized as a proper feedstock for second generation bioethanol production. Biorefineries can be integrated in the existing pulp and paper industrial plants by exploiting the high level of technology and also the infrastructures and logistics that are required to fractionate and handle woody biomass. This would contribute to the diversification of products and the increase of profitability of pulp and paper industry with additional environmental benefits. This work reviews the literature supporting the feasibility of producing ethanol from Kraft pulp, spent sulfite liquor, and pulp and paper sludge, presenting and discussing the practical attempt of biorefineries implementation in pulp and paper mills for bioethanol production.

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Bioconversion of paper mill sludge to bioethanol in the presence of accelerants or hydrogen peroxide pretreatment

Cited by 95 publications

References 30 publications

Optimization and Scale-Up of Enzymatic Hydrolysis of Wood Pulp for Cellulosic Sugar Production

Optimization and Scale-Up of Enzymatic Hydrolysis of Wood Pulp for Cellulosic Sugar Production

Integrated bioconversion of pulp and paper primary sludge to second generation bioethanol using Saccharomyces cerevisiae ATCC 26602

Second Generation Bioethanol Production: On the Use of Pulp and Paper Industry Wastes as Feedstock

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