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

Effect of a Cellulose-Degrading Strain on Anaerobic Fermentation of Corn Straw

2011 ◽  
Vol 356-360 ◽  
pp. 2510-2514 ◽  
Author(s):  
Ming Fen Niu ◽  
Sai Yue Wang ◽  
Wen Di Xu ◽  
An Dong Ge ◽  
Hao Wang
Keyword(s):  
Fatty Acids ◽  
Anaerobic Digestion ◽  
Methane Production ◽  
Volatile Fatty Acids ◽  
Anaerobic Fermentation ◽  
Biogas Production ◽  
Corn Straw ◽  
High Efficient ◽  
Important Significance ◽  
Strong Capacity

In order to improve the rate of degradation of cellulose in corn straw, the study has an important significance that compost corn straw with inoculating high-efficient microbe agents. The experiment inoculated a cellulose-degrading strain F2 which was screened from compost into compost pretreatment, the VS of corn straw reduced from 93.14% to 71.69% after 15 days, the content of cellulose reduced from 34.12g·kg-1 to 25.66g·kg-1, the rate of degradation was 24.79% which was 10.60% higher than those without the strain. An anaerobic fermentation experiment was carried out with the two groups of composted corn straw and mixed pig feces with a certain ratio, and investigations of biogas production, pH, content of volatile fatty acids(VFA) and rate of methane production were conducted. The results were that the corn straw composted with the cellulose-degrading strain peaked 4 days earlier, the maximal daily biogas production was 1470mL, the cumulative biogas production reached 23641mL which was 16.87% higher and operated stably earlier. The study showed that the cellulose-degrading strain had a strong capacity to degrade cellulose in corn straw, and then improved the performance of anaerobic digestion.

Enhancement of methane production by anaerobic digestion of corn straw with hydrogen-nanobubble water

2021 ◽  
pp. 126220
Author(s):  
Chao He ◽  
Hao Song ◽  
Liang Liu ◽  
Panpan Li ◽  
Mukesh Kumar Awasthi ◽  
...  
Keyword(s):  
Anaerobic Digestion ◽  
Methane Production ◽  
Corn Straw

scholarly journals Effect of Biochar Addition on the Microbial Community and Methane Production in the Rapid Degradation Process of Corn Straw

Energies ◽  
2021 ◽  
Vol 14 (8) ◽  
pp. 2223
Author(s):  
Zhi Wang ◽  
Ying Guo ◽  
Weiwei Wang ◽  
Liumeng Chen ◽  
Yongming Sun ◽  
...  
Keyword(s):  
Microbial Community ◽  
Anaerobic Digestion ◽  
Methane Production ◽  
Biogas Production ◽  
Degradation Process ◽  
Hydrolysis Rate ◽  
Control Group ◽  
Corn Straw ◽  
High Concentration ◽  
Fermentation Time

Anaerobic digestion with corn straw faces the problems of difficult degradation, long fermentation time and acid accumulation in the high concentration of feedstocks. In order to speed up the process of methane production, corn straw treated with sodium hydroxide was used in thermophilic (50 °C) anaerobic digestion, and the effects of biochar addition on the performance of methane production and the microbial community were analyzed. The results showed that the cumulative methane production of all treatment groups reached over 75% of the theoretical methane yield in 7 days and the addition of 4% biochar increased the cumulative methane production by 6.75% compared to the control group. The addition of biochar also decreased the number of biogas and methane production peaks from 2 to 1, and had a positive effect on shortening the digestion start-up period and reducing the fluctuation of biogas production during the digestion process. The addition of 4% biochar increased the abundance of the bacterial family Peptococcaceae throughout the digestion period, promoting the hydrolysis rate of corn straw. The dominant archaeal genus Methanosarcina was significantly more abundant at the peak stage and the end of methane production with 4% biochar added compared to the control group.

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.

Effect of Different Ensiling Conditions on the Anaerobic Digestion of Corn Stalks Pretreated with NaOH

2021 ◽  
Vol 15 (3) ◽  
pp. 342-346
Author(s):  
Xiaofei Zhen ◽  
Miao Luo ◽  
Zhenggui Li
Keyword(s):  
Anaerobic Digestion ◽  
Sodium Hydroxide ◽  
Methane Production ◽  
Low Ph ◽  
Utilization Rate ◽  
Corn Straw ◽  
Slow Start ◽  
Start Up ◽  
Overall Performance ◽  
Experimental Group

When ensiled corn straw is used for anaerobic digestion to produce biogas, it usually has problems such as slow start and long fermentation cycle due to low pH. To solve these problems, improving the utilization rate of silage straw, this study analyzed the methanogenic properties of different ensiled corn straw pretreated with sodium hydroxide. The experimental results showed that the methane-producing ability of the experimental group (CB) with cellulase was the best and reached 10.91 L in total methane production. It can be seen from the parameter performance of pH, VFAs, FAN and COD that NaOH can significantly shorten the experiment start-up period and make the system run stably. The overall trend of each group was basically the same, however, there are slight differences due to different ensiling additives. In general, the overall performance of the experiment was better after adding NaOH.

scholarly journals Impacts of Cellulase and Amylase on Enzymatic Hydrolysis and Methane Production in the Anaerobic Digestion of Corn Straw

2020 ◽  
Vol 12 (13) ◽  
pp. 5453 ◽  
Author(s):  
Xuemei Wang ◽  
Shikun Cheng ◽  
Zifu Li ◽  
Yu Men ◽  
Jiajun Wu
Keyword(s):  
Comparative Analysis ◽  
Anaerobic Digestion ◽  
Enzymatic Hydrolysis ◽  
Methane Production ◽  
Methane Yield ◽  
Corn Straw ◽  
Enzymatic Hydrolysis Of Cellulose ◽  
Hydrolysis Of Cellulose ◽  
Pre Treatment ◽  
Hydrolysis Of

The impacts of enzyme pre-treatments on anaerobic digestion of lignocellulosic biomass were explored by using corn straw as a substrate for enzyme pre-treatment and anaerobic digestion and by utilizing starch and microcrystalline cellulose as substrates for comparative analysis. The cellulase pre-treatment effectively improved the enzymatic hydrolysis of cellulose, decreased the crystallinity, and consequently showed 33.2% increase in methane yield. The methane yield of starch increased by 16.0% through amylase pre-treatment. However, when the substrate was corn straw, both the efficiencies of enzymes and methane production were markedly reduced by the lignocellulosic structure. The corn straw’s methane yields were 277.6 and 242.4 mL·CH4/g·VS with cellulase and amylase pre-treatment, respectively, which was 11.7% and 27.9% higher than that of the untreated corn straw. It may imply that the lignocellulose should be broken up firstly, enzyme pre-treatments could have great potentials when combined with other methods.

scholarly journals Enhancing methane production from the invasive macroalga Rugulopteryx okamurae through anaerobic co-digestion with olive mill solid waste: process performance and kinetic analysis

2021 ◽  
Author(s):  
D. de la Lama-Calvente ◽  
M. J. Fernández-Rodríguez ◽  
J. Llanos ◽  
J. M. Mancilla-Leytón ◽  
R. Borja
Keyword(s):  
Anaerobic Digestion ◽  
Solid Waste ◽  
Methane Production ◽  
Methane Yield ◽  
Specific Rate ◽  
Order Kinetic ◽  
Two Phase ◽  
First Order ◽  
Olive Mill Solid Waste ◽  
Olive Mill

AbstractThe biomass valorisation of the invasive brown alga Rugulopteryx okamurae (Dictyotales, Phaeophyceae) is key to curbing the expansion of this invasive macroalga which is generating tonnes of biomass on southern Spain beaches. As a feasible alternative for the biomass management, anaerobic co-digestion is proposed in this study. Although the anaerobic digestion of macroalgae barely produced 177 mL of CH4 g−1 VS, the co-digestion with a C-rich substrate, such as the olive mill solid waste (OMSW, the main waste derived from the two-phase olive oil manufacturing process), improved the anaerobic digestion process. The mixture improved not only the methane yield, but also its biodegradability. The highest biodegradability was found in the mixture 1 R. okamurae—1 OMSW, which improved the biodegradability of the macroalgae by 12.9% and 38.1% for the OMSW. The highest methane yield was observed for the mixture 1 R. okamurae—3 OMSW, improving the methane production of macroalgae alone by 157% and the OMSW methane production by 8.6%. Two mathematical models were used to fit the experimental data of methane production time with the aim of assessing the processes and obtaining the kinetic constants of the anaerobic co-digestion of different combination of R. okamurae and OMSW and both substrates independently. First-order kinetic and the transference function models allowed for appropriately fitting the experimental results of methane production with digestion time. The specific rate constant, k (first-order model) for the mixture 1 R. okamurae- 1.5 OMSW, was 5.1 and 1.3 times higher than that obtained for the mono-digestion of single OMSW and the macroalga, respectively. In the same way, the transference function model revealed that the maximum methane production rate (Rmax) was also found for the mixture 1 R. okamurae—1.5 OMSW (30.4 mL CH4 g−1 VS day−1), which was 1.6 and 2.2 times higher than the corresponding to the mono-digestions of the single OMSW and sole R. okamurae (18.9 and 13.6 mL CH4 g−1 VS day−1), respectively.

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