Effect of combined addition amount of nano zero-valent iron and biochar on methane production by anaerobic digestion of corn straw

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.

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Response of sludge fermentation liquid and microbial community to nano zero-valent iron exposure in a mesophilic anaerobic digestion system

RSC Advances ◽

10.1039/c6ra02591a ◽

2016 ◽

Vol 6 (29) ◽

pp. 24236-24244 ◽

Cited By ~ 21

Author(s):

Bao Yu ◽

Xiaoting Huang ◽

Dongling Zhang ◽

Ziyang Lou ◽

Haiping Yuan ◽

...

Keyword(s):

Microbial Community ◽

Anaerobic Digestion ◽

Zero Valent Iron ◽

Hydrogenotrophic Methanogenesis ◽

Fermentation Liquid ◽

System P ◽

Nano Zero Valent Iron ◽

Hydrolysis Acidification

NZVI could promote hydrolysis-acidification, facilitate the release of biodegradable compounds and enrich hydrogenotrophic methanogenesis by Clostridia and Methanosarcina.

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Mechanism of Oxytetracycline Removal by Coconut Shell Biochar Loaded with Nano-Zero-Valent Iron

International Journal of Environmental Research and Public Health ◽

10.3390/ijerph182413107 ◽

2021 ◽

Vol 18 (24) ◽

pp. 13107

Author(s):

Qi Li ◽

Siyu Zhao ◽

Yuhang Wang

Keyword(s):

Single Molecule ◽

Zero Valent Iron ◽

Ion Concentration ◽

Coconut Shell ◽

Batch Adsorption ◽

Isothermal Adsorption ◽

Pseudo Second Order ◽

Nano Zero Valent Iron ◽

Addition Amount ◽

Coconut Shell Biochar

In this paper, coconut shell biochar (BC), pickling biochar (HBC), and nano-zero-valent iron-loaded biochar (nZVI-HBC) were prepared; these were used to remove oxytetracycline (OTC), and the removal mechanism and degradation product were analyzed. These biochars were characterized using SEM, XRD, FTIR, and XPS. The effects of biochar addition amount, pH, ion type, and ion concentration on OTC adsorption were studied by a batch adsorption experiment. Under the optimal conditions, the equilibrium adsorption capacity of nZVI-HBC to OTC was 196.70 mg·g−1. The adsorption process can be described by Langmuir isothermal adsorption equations, conforming to the pseudo-second-order dynamics model, indicating that adsorption is dominated by single-molecule chemical adsorption, and a spontaneous process of increasing heat absorption entropy. Mass spectrometry showed that the OTC removal process of nZVI-HBC included not only adsorption but also degradation. These results provide a practical and potentially valuable material for the removal of OTC.

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

Bioresource Technology ◽

10.1016/j.biortech.2021.126220 ◽

2021 ◽

pp. 126220

Author(s):

Chao He ◽

Hao Song ◽

Liang Liu ◽

Panpan Li ◽

Mukesh Kumar Awasthi ◽

...

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Corn Straw

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

Bioresource Technology ◽

10.1016/j.biortech.2017.11.083 ◽

2018 ◽

Vol 250 ◽

pp. 741-749 ◽

Cited By ~ 12

Author(s):

Yeqing Li ◽

Fang Yan ◽

Tao Li ◽

Ying Zhou ◽

Hao Jiang ◽

...

Keyword(s):

Anaerobic Digestion ◽

Methane Production ◽

Corn Straw ◽

High Solid

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

Bioresource Technology ◽

10.1016/j.biortech.2021.124671 ◽

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

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

Energies ◽

10.3390/en14082223 ◽

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.

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