Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion

Jaffar, M.; Pang, Yunzhi; Yuan, Hairong; Zou, Dexun; Liu, Yan-Ping; Zhu, Baoning; Korai, Rashid Mustafa; Li, Xiujin

doi:10.1016/j.cjche.2015.11.005

Cited by 96 publications

(52 citation statements)

References 26 publications

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“…Though under different conditions of alkaline pretreatment, the yield of methane in the current work of eucalyptus was also remarkably elevated from 175.81 to 243.53 mL CH 4 /g VS after NaOH pretreatment (Figure 2b). The complex structures of cellulose, hemicellulose, and lignin are difficult for microorganisms to degrade [19]. The daily and cumulative methane production of the single-digestions of WW and RS was evidently increased by NaOH pretreatment (Figure 2).…”

Section: Discussionmentioning

confidence: 99%

Evaluation on the Methane Production Potential of Wood Waste Pretreated with NaOH and Co-Digested with Pig Manure

Tan

Zhao

et al. 2019

Catalysts

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Wood waste generated during the tree felling and processing is a rich, green, and renewable lignocellulosic biomass. However, an effective method to apply wood waste in anaerobic digestion is lacking. The high carbon to nitrogen (C/N) ratio and rich lignin content of wood waste are the major limiting factors for high biogas production. NaOH pre-treatment for lignocellulosic biomass is a promising approach to weaken the adverse effect of complex crystalline cellulosic structure on biogas production in anaerobic digestion, and the synergistic integration of lignocellulosic biomass with low C/N ratio biomass in anaerobic digestion is a logical option to balance the excessive C/N ratio. Here, we assessed the improvement of methane production of wood waste in anaerobic digestion by NaOH pretreatment, co-digestion technique, and their combination. The results showed that the methane yield of the single digestion of wood waste was increased by 38.5% after NaOH pretreatment compared with the untreated wood waste. The methane production of the co-digestion of wood waste and pig manure was higher than that of the single digestion of wood waste and had nonsignificant difference with the single-digestion of pig manure. The methane yield of the co-digestion of wood waste pretreated with NaOH and pig manure was increased by 75.8% than that of the untreated wood waste. The findings indicated that wood waste as a sustainable biomass source has considerable potential to achieve high biogas production in anaerobic digestion.

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Section: Discussionmentioning

confidence: 99%

Evaluation on the Methane Production Potential of Wood Waste Pretreated with NaOH and Co-Digested with Pig Manure

Tan

Zhao

et al. 2019

Catalysts

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“…Though KOH could be a solution to this problem. Considering that KOH is a strong base, KOH-pretreated anaerobic digestate is gaining more importance as a fertilizer in the agriculture sector (Jaffar et al 2016). It has been also reported that 2.5% KOH-treated CS generates maximum methane yield of 295 mL/g VS, and significantly improved 95.6% with regard to untreated CS (Li et al 2015b).…”

Section: Pretreatment Methodsmentioning

confidence: 99%

Pretreatment methods of lignocellulosic biomass for anaerobic digestion

et al. 2017

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Agricultural residues, such as lignocellulosic materials (LM), are the most attractive renewable bioenergy sources and are abundantly found in nature. Anaerobic digestion has been extensively studied for the effective utilization of LM for biogas production. Experimental investigation of physiochemical changes that occur during pretreatment is needed for developing mechanistic and effective models that can be employed for the rational design of pretreatment processes. Various-cutting edge pretreatment technologies (physical, chemical and biological) are being tested on the pilot scale. These different pretreatment methods are widely described in this paper, among them, microaerobic pretreatment (MP) has gained attention as a potential pretreatment method for the degradation of LM, which just requires a limited amount of oxygen (or air) supplied directly during the pretreatment step. MP involves microbial communities under mild conditions (temperature and pressure), uses fewer enzymes and less energy for methane production, and is probably the most promising and environmentally friendly technique in the long run. Moreover, it is technically and economically feasible to use microorganisms instead of expensive chemicals, biological enzymes or mechanical equipment. The information provided in this paper, will endow readers with the background knowledge necessary for finding a promising solution to methane production.

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“…The second reason might be that the methanogen activity was inhibited by acidophilic conditions attributed to the ethanol-recovery process. Optimum pH range for methanogenus activity was reported in a range of 6.0-7.5 [25][26][27][28][29][30][31][32][33] , while the MeCSTR pH range was below 5.7. However, effluent pH revealed a gradual rise in pH values.…”

Section: Hydrogen and Ethanol Productionmentioning

confidence: 99%

“…Fermentation types of the acidogenic phase mainly include the following: acetate-type, propionate-type, butyrate-type, and ethanol-type. For a long period, acetate-type fermentation has been depicted as the most common pathway in past surveys [13,14] . In the 1990s, the studies conducted by Ren et al and H. Wang et al revealed that ethanol-type fermentation is the optimal pathway for fermentative hydrogen production by organic waste water.…”

Section: Introductionmentioning

confidence: 99%

Comparative analysis and improvement of the 2-CSTRs anaerobic digestion system on biofuel production

2017

International Journal of Hydrogen Energy

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A 2-CSTRs anaerobic digestion system using molasses wastewater as a biochemical substrate for fermentative bioenergy production and substrate degradation under various ethanol recovery rates was developed. The effects of ethanol recovery rates (0%-80%) and organic loading rates (OLRs; 8, 16 and 24 kgCODm-3 d-1) on bioenergy production rate (ε T) and bioenergy production yield were examined, respectively. Since the system produced a significant amount of biofuels (i.e. hydrogen, methane and ethanol), the process performance in terms of energy conversion derived from the combination of three biofuels was calculated according to production rates and combustion heat values. Recycle and reflux are the two reuse approaches for effluents in the system. A maximum HPR of 1.34 (±0.7) mol d-1 and a maximum EPR of 0.45 (±0.4) mol d-1 were observed at the OLR of 24 kgCOD m-3 d-1. Linear regression of the collection between HPR and EPR can be expressed as y=0.3182x+0.0114 (r 2 =0.9853). The highest MPR of 0.45 (±0.07) mol d-1 was obtained at the original OLR of 24 kgCOD m-3 d-1 , with an ethanol recover rate of 0%. Recycle resulted to a higher ε T and energy yield than reflux with the ethanol recover rate of 0% and 20%, respectively. This was equal to the ethanol recover rate of 50%, but lower than the ethanol recover rate of 80%; indicating that recycle would be more feasible for lower ethanol recover rates, and reflux may be more suitable with other kinds of ethanol recover rates.

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Wheat straw pretreatment with KOH for enhancing biomethane production and fertilizer value in anaerobic digestion

Cited by 96 publications

References 26 publications

Evaluation on the Methane Production Potential of Wood Waste Pretreated with NaOH and Co-Digested with Pig Manure

Evaluation on the Methane Production Potential of Wood Waste Pretreated with NaOH and Co-Digested with Pig Manure

Pretreatment methods of lignocellulosic biomass for anaerobic digestion

Comparative analysis and improvement of the 2-CSTRs anaerobic digestion system on biofuel production

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