Characterization of organic substances in lignite before and after hydrogen peroxide treatment: Implications for microbially enhanced coalbed methane

Haq, Shofa Rijalul; Tamamura, Shuji; Igarashi, Toshifumi; Kaneko, Katsuhiko

doi:10.1016/j.coal.2017.11.009

Cited by 26 publications

(15 citation statements)

References 46 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The development of this series of sports requires the use of beach natural conditions and sporting goods to meet the leisure, fitness, and entertainment needs of holiday tourists (Hamidi et al 2021). Therefore, in order to meet people's leisure needs and the development of the city's economy, it is very important to study beach leisure sports along the coast (Haq et al 2018).…”

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Coastline geological parameters and beach motion image simulation based on particle swarm optimization

Zou

2021

Arab J Geosci

View full text Add to dashboard Cite

This paper uses the function of neural network-based nonlinear mapping and particle group optimization algorithm to optimize the system, and then uses the particle group optimization algorithm of inertia weight, so as to achieve the goal of optimizing the weight of neural network training. By choosing to encode the geological parameters of the coastline with mpeg-4 and obtain the relevant data, the relevant data of the beach motion image can be obtained, so that the simulation experiment can be carried out. This paper introduces the process of establishing a multi-modal pore size distribution fitting model based on probability density function, and conducts an experimental analysis on the geological parameters and pore structure of two typical shale storage layer samples in China. Finally, the multi-peak opening distribution fitting model and the pore size distribution are obtained through quantitative fitting curves, and the geological parameters of the marine continental shale that affect the pore size distribution are investigated, and the pore size distribution of the shale and the geology of the shale are investigated. In-depth parameter analysis is to explore the thermal maturity of organic matter, and the relationship between its content and mineral composition. In addition, the coastal image simulation is researched focusing on the characteristics of coastal beach recreational sports, the problems existing in the development process, and future development countermeasures. Finally, it is pointed out that the future development trend of coastal beach leisure sports, through the integration of local leisure sports-related characteristics and professional development, so as to achieve the implantation of culture in sports, and the organic combination of the two promotes the economic and ecological environment.

show abstract

Section: Introductionmentioning

confidence: 99%

RETRACTED ARTICLE: Coastline geological parameters and beach motion image simulation based on particle swarm optimization

Zou

2021

Arab J Geosci

View full text Add to dashboard Cite

show abstract

“…The organic solvent can enter the coal body, break the force of the small molecular phase, and dissolve the small molecular organic matter. It has been demonstrated that low‐rank coal contains numerous humic acids, and the basic structure of humic acid is an aromatic ring and an aliphatic ring with free radicals and high physiological activity . Humic acid affects biogas production .…”

Section: Resultsmentioning

confidence: 99%

“…It has been demonstrated that low-rank coal contains numerous humic acids, and the basic structure of humic acid is an aromatic ring and an aliphatic ring with free radicals and high physiological activity. 29,30 Humic acid affects biogas production. 31 However, an alkaline solution will react strongly with it, causing humic acid consumption.…”

Section: Analysis Of the Extraction Ratiomentioning

confidence: 99%

Controlling mechanism of coal chemical structure on biological gas production characteristics

et al. 2020

View full text Add to dashboard Cite

Summary To find the effect of coal chemical structure on biogas production, Lignite B was collected and extracted with nitrogen methylpyrrolidone (NMP), acetone and 0.60 mol/L NaOH. Simultaneously, methanogenic bacteria were enriched, and gas production experiments involving solvent extraction from residual coal and secondary gas production experiments involving coal were performed. The characteristics of biogas production, microcrystalline structure and coal chemical structure were analyzed. The results showed that the biogas production capacity of residual coal extracted by different solvents differed. The biogas production capacity of residual coal extracted by 0.60 mol/L NaOH was severely inhibited. The biogas production capacity of residual coal extracted by NMP and acetone was enhanced compared with that of raw coal. In contrast, primary residual coal still exhibits potential for methane production, but the methane production efficiency was reduced. Changes in the microcrystalline structure and functional groups of residual coal showed that solvent extraction increases the spacing and stacking height of the aromatic lamellae of coal, reduces the hydroxyl, methyl, methylene and aromatic hydrocarbon levels in coal, loosens the macromolecular network structure of coal, and enhances the connectivity of pores and fissures, thus allowing methane‐producing bacteria to enter the coal mass and create favorable conditions for gas production through interactions between the two. X‐ray photoelectron spectroscopy measurements showed that the secondary gas production increased the C content on the coal surface, decreased the O content and the O/C ratio, thus promoting the consumption of oxygen‐containing functional groups on the coal surface to further produce gas.

show abstract

“…The peak heights and peak areas of different coal samples were different, but the approximate peak shapes were the same, indicating that they contained similar functional groups. The structural composition of lignite can be described by alkyl-C, aromatic-C, carbonyl-C, and O-alkyl-C contents (Haq et al, 2018). The characteristic peaks in the IR spectrum were mainly divided into three categories: (1) Aromatic hydrocarbon: The peak at 2,919/cm was related to the stretching vibration of aromatic C-H bond; 1,600/cm was the characteristic absorption peak of the aromatic ring.…”

Section: Resultsmentioning

confidence: 99%

Alteration of Methanogenic Archaeon by Ethanol Contribute to the Enhancement of Biogenic Methane Production of Lignite

et al. 2019

View full text Add to dashboard Cite

Bioconverting coal to methane is a green and environmental friendly method to reuse waste coal. In this study, heterologous bacteria were used for the gas-producing fermentation of lignite under laboratory conditions, simultaneously, different concentrations of ethanol added into the culture to investigate the effect of ethanol on gas production and microbial flora structure. Results show that when the ethanol concentration was 1%, the best methanogenesis was achieved at 44.86 mL/g, which was twice the gas production of 0% ethanol. Before and after gas fermentation, the composition and structure of the coal changed, the volatile matter and fixed carbon increased, and the ash decreased. The absorbance value at characteristic peaks of all functional groups decreased, new peaks were generated at 2,300/cm, and the peak value disappeared at 3,375/cm. Thus, microorganisms interacted with coal, consumed it, and produced new materials. The microbial flora changes during gas production were tracked in real time. 0.5 and 1% ethanol did not obviously change the bacterial communities but strongly influenced the archaeon communities, thereby changed the methane production pathway. In the absence of ethanol, Methanosarcina was continuously increasing with the extension of fermentation time, this pathway was the nutrient type of acetic acid. When ethanol was added, Methanobacterium gradually increased, the pathway was mainly hydrotropic type. In summary, adding ethanol can increase the coalbed methane production, change the structure and composition of coal, and facilitate the interaction of microbe with coal. Therefore, the methanogenic archaeon changes could help improve the methane-producing ability of lignite in the presence of ethanol.

show abstract

Characterization of organic substances in lignite before and after hydrogen peroxide treatment: Implications for microbially enhanced coalbed methane

Cited by 26 publications

References 46 publications

RETRACTED ARTICLE: Coastline geological parameters and beach motion image simulation based on particle swarm optimization

RETRACTED ARTICLE: Coastline geological parameters and beach motion image simulation based on particle swarm optimization

Controlling mechanism of coal chemical structure on biological gas production characteristics

Alteration of Methanogenic Archaeon by Ethanol Contribute to the Enhancement of Biogenic Methane Production of Lignite

Contact Info

Product

Resources

About