Insights of enhancing methane production under high-solid anaerobic digestion of wheat straw by calcium peroxide pretreatment and zero valent iron addition

2021 ◽  
Author(s):  
Wenjing Tian ◽  
Jianhao Li ◽  
Lirong Zhu ◽  
Wen Li ◽  
Linyan He ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Wheat Straw ◽  
Methane Production ◽  
Zero Valent Iron ◽  
Calcium Peroxide ◽  
High Solid ◽  
Iron Addition

scholarly journals Pretreatment of Lignocellulosic Biomass with 1-Ethyl-3-methylimidazolium Acetate for Its Eventual Valorization by Anaerobic Digestion

Resources ◽  
2021 ◽  
Vol 10 (12) ◽  
pp. 118
Author(s):  
Jose D. Marin-Batista ◽  
Angel F. Mohedano ◽  
Angeles de la Rubia
Keyword(s):  
Ionic Liquid ◽  
Anaerobic Digestion ◽  
Wheat Straw ◽  
Lignocellulosic Biomass ◽  
Methane Production ◽  
Liquid Fraction ◽  
Soluble Sugars ◽  
Crystallinity Index ◽  
Barley Straw ◽  
Cellulose Crystallinity

This study assessed the breakdown of lignocellulosic biomass (LB) with the ionic liquid (IL) 1-ethyl-3-methylimidazolium acetate ([Emim][Ac]) as a pretreatment to increase the methane yield. The pretreatment was conducted for wheat straw (WS), barley straw (BS), and grape stem (GS) at 120 °C for 120 min, using several LB to [Emim][Ac] ratios (1:1, 1:3, and 1:5 w/w). Pretreatment significantly disrupted the lignocellulose matrix of each biomass into soluble sugars. GS showed the highest sugar yield, which was followed by WS, while BS was slightly hydrolyzed (175.3 ± 2.3, 158.2 ± 5.2, and 51.1 ± 3.1 mg glucose g–1 biomass, respectively). Likewise, the pretreatment significantly reduced the cellulose crystallinity index (CrI) of the resulting solid fractions of GS and WS by 15% and 9%, respectively, but slightly affected the CrI of BS (5%). Thus, BMP tests were only carried out for raw and hydrothermally and [Emim][Ac] (1:5) pretreated GS and WS. The untreated GS and WS showed similar methane yields to those achieved for the solid fraction obtained after pretreatment with an LB to [Emim][Ac] ratio of 1:5 (219 ± 10 and 368 ± 1 mL CH4 g–1 VS, respectively). The methane production of the solid plus liquid fraction obtained after IL pretreatment increased by 1.61- and 1.34-fold compared to the raw GS and WS, respectively.

High-solid anaerobic digestion of corn straw for methane production and pretreatment of bio-briquette

2018 ◽  
Vol 250 ◽  
pp. 741-749 ◽  
Author(s):  
Yeqing Li ◽  
Fang Yan ◽  
Tao Li ◽  
Ying Zhou ◽  
Hao Jiang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Corn Straw ◽  
High Solid

Deeper insights into effect of activated carbon and nano-zero-valent iron addition on acidogenesis and whole anaerobic digestion

2021 ◽  
pp. 124671
Author(s):  
Ruming Wang ◽  
Chunxing Li ◽  
Nan Lv ◽  
Xiaofang Pan ◽  
Guanjing Cai ◽  
...  
Keyword(s):  
Activated Carbon ◽  
Anaerobic Digestion ◽  
Zero Valent Iron ◽  
Nano Zero Valent Iron ◽  
Iron Addition

scholarly journals Zero valent iron enhances methane production from primary sludge in anaerobic digestion

2018 ◽  
Vol 351 ◽  
pp. 1159-1165 ◽  
Author(s):  
Wei Wei ◽  
Zhengqing Cai ◽  
Jie Fu ◽  
Guo-Jun Xie ◽  
Ang Li ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Zero Valent Iron ◽  
Primary Sludge

scholarly journals Effects of Freezing-Thawing Pretreatment on Anaerobic Digestion of Wheat Straw and its Kinetics Analysis

2021 ◽  
Author(s):  
QIANRU ZHANG ◽  
Yiqing Yao ◽  
Xinming Xi
Keyword(s):  
Anaerobic Digestion ◽  
Wheat Straw ◽  
Methane Production ◽  
Freezing Temperature ◽  
Logistic Function ◽  
Lag Phase ◽  
Model Parameters ◽  
Freezing Time ◽  
Function Model ◽  
Phase Time

Abstract In this study, freezing-thawing (FT) pretreatment of different freezing time and freezing temperatures was investigated to find 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 fit, followed by modified Gompertz model, yet transfer function model lost efficacy in this experiment. Logistic function model was then used to reveal the influence 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 find 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 fit, followed by modified Gompertz model, yet transfer function model lost efficacy in this experiment. Logistic function model was then used to reveal the influence 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.

scholarly journals Evaluation of moderate temperature thermal pretreatment effects on the high-solid anaerobic digestion of OFMSW

2021 ◽  
Author(s):  
Masoud Kamali ◽  
Reza Abdi ◽  
Abbas Rohani ◽  
Shamsollah Abdollahpor ◽  
Sirous Ebrahimi
Keyword(s):  
Anaerobic Digestion ◽  
Energy Balance ◽  
Methane Production ◽  
Moderate Temperature ◽  
Positive Energy ◽  
Net Energy ◽  
Thermal Pretreatment ◽  
High Solid ◽  
Randomized Design ◽  
Methane Enhancement

Abstract Anaerobic digestion (AD) of Organic Fraction of Municipal Solid Waste (OFMSW), leads to a reduction of methane emission to the atmosphere besides production of bioenergy. In this work, applying moderate temperature thermal pretreatment at 70, 90 and 110°C for the durations of 30,75,120 and 180 minutes on relatively high solid concentration (16%) OFMSW AD using batch biomethane potential assays (BMP) under mesophilic conditions has been studied. To evaluate the effects of each temperature and time of pretreatment and their interactions on methane production, factorial experiments in completely randomized design were implemented. The criteria used for deciding on the effectiveness of the thermal pretreatments were the methane enhancement and net energy production. Though, all the aforementioned thermal pretreatments increased methane yield, the energy balance evaluation revealed that the recovery of bioenergy is feasible for some of these pretreatments and could contribute to a positive energy balance. The best result of methane production (342.66 ± 6.11 ml CH4/g VS), which was approximately 34% higher compared with the specific methane production of untreated OFMSW, was obtained by implementing pretreatment at 90°C for 120 minutes as well as the net energy generation of 57.26 KWh/ton, resulting from applying this thermal pretreatment.

Relieving ammonia inhibition by zero-valent iron (ZVI) dosing to enhance methanogenesis in the high solid anaerobic digestion of swine manure

2020 ◽  
Vol 118 ◽  
pp. 452-462
Author(s):  
Xiaoshan Meng ◽  
Qianwen Sui ◽  
Jibao Liu ◽  
Dawei Yu ◽  
Yawei Wang ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Swine Manure ◽  
Zero Valent Iron ◽  
Ammonia Inhibition ◽  
High Solid
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