Enhanced hydrolysis of lignocellulose in corn cob by using food waste pretreatment to improve anaerobic digestion performance

Zou, Huijing; Jiang, Qin; Zhu, Ruilin; Chen, Yongdong; Sun, Tong; Li, Mingxing; Zhai, Jun; Shi, Dezhi; Ai, Hainan; Gu, Li; He, Qiang

doi:10.1016/j.jenvman.2019.109830

Cited by 69 publications

(20 citation statements)

References 47 publications

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“…There have been studies seeking to improve the efficiency of corncob utilization for bioenergy through thermochemical processes such as combustion [11,12], gasification [13,14], and carbonization [15]. There has been some work to investigate biochemical processes such as anaerobic digestion [16] and ethanol fermentation [17]. For physical and mechanical processes, studies have been carried out on comminution [18] and densification [19,20].…”

Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Torrefaction Temperature and Residence Time on the Fuel Quality of Corncobs in a Fixed-Bed Reactor

et al. 2022

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Biomass from agriculture is a promising alternative fuel due to its carbon-neutral feature. However, raw biomass does not have properties required for its direct utilization for energy generation. Torrefaction is considered as a pretreatment method to improve the properties of biomass for energy applications. This study was aimed at investigating the effects of torrefaction temperature and residence time on some physical and chemical properties of torrefied corncobs. Therefore, a fixed-bed torrefaction reactor was developed and used in the torrefaction of corncobs. The torrefaction process parameters investigated were the torrefaction temperature (200, 240, and 280 °C) and the residence time (30, 60, and 90 min). The effects of these parameters on the mass loss, grindability, chemical composition, and calorific value of biomass were investigated. It was shown that the mass loss increased with increasing torrefaction temperature and residence time. The grinding throughput of the biomass was improved by increasing both the torrefaction temperature and the residence time. Torrefaction at higher temperatures and longer residence times had greater effects on the reduction in particle size of the milled corncobs. The calorific value was highest at a torrefaction temperature of 280 °C and a residence time of 90 min. The energy yield for all treatments ranged between 92.8 and 99.2%. The results obtained in this study could be useful in the operation and design of torrefaction reactors. They also provided insight into parameters to be investigated for optimization of the torrefaction reactor.

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Section: Introductionmentioning

confidence: 99%

Investigation of the Effects of Torrefaction Temperature and Residence Time on the Fuel Quality of Corncobs in a Fixed-Bed Reactor

et al. 2022

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“…The lower pH was negative to the activity of methanogenesis and thus reduced methane production. 4 In the AD system, conductive materials, such as graphene, 5 biochar, 6 magnetite, 7 carbon nanotubes, 8,9 nanoiron tetroxide, 10 and granular activated carbon, 11 were added. It can stimulate direct interspecies electron transfer (DIET) and improve the methanogenesis pathway, thereby promoting methane production and shortening the lag period and enhancing the buffering capacity of the system to ammonia nitrogen and pH.…”

Section: Introductionmentioning

confidence: 99%

“…Acidification of the AD system means that it has a low pH value around 3.5 in food waste (FW) monodigestion, especially when the digesters are overloaded. The lower pH was negative to the activity of methanogenesis and thus reduced methane production …”

Section: Introductionmentioning

confidence: 99%

Enhancement from Anaerobic Digestion of Food Waste by Conductive Materials: Performance and Mechanism

et al. 2022

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Conductive materials (CM) have recently attracted research interest in the anaerobic digestion of food waste to achieve reduction and resource utilization. Fe-metal organic frameworks (Fe-MOF) and Ketjen Black (KB), the conductive materials (CMs), were added for the enhancement of food waste digestion. This study therefore, is intended to fill in this knowledge gap and clarify the underlying mechanism of CM-promoted performance. Batch experiments revealed that the optimal additions of Fe-MOF and KB were 0.5 g·L–1 and 0.2 g·L–1, respectively. The biogas production increased by 27.50% and 29.45% compared with the blank group, and the removal efficiency of volatile solids (VS), total solids (TS), and chemical oxygen demand (COD) increased by 18.28%, 40.52%, and 15.31%. The lag period was shortened from 3.042 to 2.006 and 1.544 days, respectively. Mechanism studies revealed that Fe-MOF and KB were beneficial to food waste digestion, and the functional groups of Fe-MOF and KB increased the buffer capacity of the system to pH and ammonia nitrogen. The physicochemical properties of Fe-MOF and KB promote the activity of the electron transfer system (ETS); the ETS activity was about 2 times the 11.32 mg·(g·h)−1 of the blank group. Zeta potential and electrical conductivity were beneficial to the establishment of intermicrobial direct interspecies electron transfer (DIET).

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“…However, these components of WS are closely combined with each other to form a complex three-dimensional structure on the cellular scale, making WS free from microbial attack (Kumari et al 2018). This obstacle makes WS di cult to be degraded, hence a long lag phase due to hydrolysis (You et al 2019;Zou et al 2020). In most cases, hydrolysis is a rate limiting step in the AD with straw as substrate (Cornejo et al 2019).…”

Section: Introductionmentioning

confidence: 99%

“…In the whole process, the length of lag phase time will directly affect or even determine the degree of organic matter degradation and methane production performance (Chen et al 2020). Various pretreatment methods aim to shorten the lag phase and improve the AD e ciency of lignocellulosic biomass (Paul et al 2018;Phuttaro et al 2019;Zou et al 2020). Physical pretreatment usually leads to larger surface area and more porosity of substrate, thus enhances the accessibly of cellulose (Yu et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Effects of freezing–thawing pretreatment on anaerobic digestion of wheat straw and its kinetics analysis

Zhang

Yao

2021

Clean Techn Environ Policy

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In this study, freezing-thawing (FT) pretreatment of different freezing time and freezing temperatures was investigated to nd the effect on anaerobic digestion of wheat straw (WS). The freezing temperature gradient is -10, -20, -40 and -80℃, and the freezing time gradient is 12 h, 24 h, 48 h and 96 h. Total methane production exhibited a mere distance among all samples. Morphology change sculptured by SEM showed this method broken the structure of WS leaving fragments and pores in varying degrees. Three kinetic models were performed on WS to represent the behavior of experimental data. Kinetic model parameters of total methane production and lag phase time showed that logistic function model had the best t, followed by modi ed Gompertz model, yet transfer function model lost e cacy in this experiment. Logistic function model was then used to reveal the in uence on lag phase caused by freezing time and freezing temperature, the results implied that FT pretreatment can shorten the lag phase time of anaerobic digestion (AD), providing a 21.39% improvement under the optimal conditions of -20℃ 96 h. The analysis of response surface regression shows that the freezing temperature has more effect on the lag phase time of anaerobic digestion than freezing time. Warmer freezing temperature of -20℃ do better than -80℃ on lag time, which can be achieved in most cold regions, so this treatment can occur naturally in such area without additional energy input.In this study, freezing-thawing (FT) pretreatment of different freezing time and freezing temperatures was investigated to nd the effect on anaerobic digestion of wheat straw (WS). The freezing temperature gradient is -10, -20, -40 and -80℃, and the freezing time gradient is 12 h, 24 h, 48 h and 96 h. Total methane production exhibited a mere distance among all samples. Morphology change sculptured by SEM showed this method broken the structure of WS leaving fragments and pores in varying degrees. Three kinetic models were performed on WS to represent the behavior of experimental data. Kinetic model parameters of total methane production and lag phase time showed that logistic function model had the best t, followed by modi ed Gompertz model, yet transfer function model lost e cacy in this experiment. Logistic function model was then used to reveal the in uence on lag phase caused by freezing time and freezing temperature, the results implied that FT pretreatment can shorten the lag phase time of anaerobic digestion (AD), providing a 21.39% improvement under the optimal conditions of -20℃ 96 h. The analysis of response surface regression shows that the freezing temperature has more effect on the lag phase time of anaerobic digestion than freezing time. Warmer freezing temperature of -20℃ do better than -80℃ on lag time, which can be achieved in most cold regions, so this treatment can occur naturally in such area without additional energy input.This study investigated the effect of FT pretreatment on AD of WS. This pretreatment method is novel and has been less investigate...

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Enhanced hydrolysis of lignocellulose in corn cob by using food waste pretreatment to improve anaerobic digestion performance

Cited by 69 publications

References 47 publications

Investigation of the Effects of Torrefaction Temperature and Residence Time on the Fuel Quality of Corncobs in a Fixed-Bed Reactor

Investigation of the Effects of Torrefaction Temperature and Residence Time on the Fuel Quality of Corncobs in a Fixed-Bed Reactor

Enhancement from Anaerobic Digestion of Food Waste by Conductive Materials: Performance and Mechanism

Effects of freezing–thawing pretreatment on anaerobic digestion of wheat straw and its kinetics analysis

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