scholarly journals Effect of Clinoptilolite and Halloysite Addition on Biogas Production and Microbial Community Structure during Anaerobic Digestion

Materials ◽  
2020 ◽  
Vol 13 (18) ◽  
pp. 4127
Author(s):  
Martyna Ciezkowska ◽  
Tomasz Bajda ◽  
Przemyslaw Decewicz ◽  
Lukasz Dziewit ◽  
Lukasz Drewniak
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Microbial Community Structure ◽  
Biogas Production ◽  
Oxygen Demand ◽  
Maize Silage ◽  
Gas Treatment ◽  
Significant Difference

The study presents a comparison of the influence of a clinoptilolite-rich rock—zeolite (commonly used for improving anaerobic digestion processes)—and a highly porous clay mineral, halloysite (mainly used for gas purification), on the biogas production process. Batch experiments showed that the addition of each mineral increased the efficiency of mesophilic anaerobic digestion of both sewage sludge and maize silage. However, halloysite generated 15% higher biogas production during maize silage transformation. Halloysite also contributed to a much higher reduction of chemical oxygen demand for both substrates (by ~8% for maize silage and ~14% for sewage sludge) and a higher reduction of volatile solids and total ammonia for maize silage (by ~8% and ~4%, respectively). Metagenomic analysis of the microbial community structure showed that the addition of both mineral sorbents influenced the presence of key members of archaea and bacteria occurring in a well-operated biogas reactor. The significant difference between zeolite and halloysite is that the latter promoted the immobilization of key methanogenic archaea Methanolinea (belong to Methanomicrobia class). Based on this result, we postulate that halloysite could be useful not only as a sorbent for (bio)gas treatment methodologies but also as an agent for improving biogas production.

scholarly journals Effects of shearing on biogas production and microbial community structure during anaerobic digestion with recuperative thickening

2017 ◽  
Vol 234 ◽  
pp. 439-447 ◽  
Author(s):  
Shufan Yang ◽  
Hop V. Phan ◽  
Heriberto Bustamante ◽  
Wenshan Guo ◽  
Hao H. Ngo ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Anaerobic Digestion ◽  
Microbial Community Structure ◽  
Biogas Production

Effect of H2 addition on the microbial community structure of a mesophilic anaerobic digestion system

Energy ◽  
2020 ◽  
Vol 198 ◽  
pp. 117368 ◽  
Author(s):  
Xianpu Zhu ◽  
Liumeng Chen ◽  
Yichao Chen ◽  
Qin Cao ◽  
Xiaofeng Liu ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Anaerobic Digestion ◽  
Microbial Community Structure ◽  
H2 Addition

Effect of Ultrasonic Pretreatment for the Anaerobic Digestion of Sewage Sludge

2012 ◽  
Vol 531 ◽  
pp. 528-531 ◽  
Author(s):  
Na Wei
Keyword(s):  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Volatile Fatty Acids ◽  
Biogas Production ◽  
Oxygen Demand ◽  
High Concentration ◽  
Ultrasonic Pretreatment ◽  
Soluble Chemical Oxygen Demand ◽  
Pre Treatment ◽  
Settling Characteristics

Anaerobic digestion is an economic and environmentally friendly technology for treating the biomass material-sewage sludge, but has some limitations, such as the low efficient biogass production. In this paper ultrasound was proposed as pre-treatment for effective sludge anaerobic digestion. Sludge anaerobic digestion experiments with ultrasonic pretreatment was investigated. It can be seen that this treatment effectively leaded to the increase of soluble chemical oxygen demand(SCOD) and volatile fatty acids(VFA)concentration. High concentration of VFA leaded to a increase in biogas production. Besides, the SV of sludge was reduced and the settling characteristics of sludge was improved after ultrasonic pretreatment. It can be concluded that sludge anaerobic digestion with ultrasonic pretreatment is an effective method for biomass material transformation.

scholarly journals Variations in microbial community structure and functional gene expression in bio-treatment processes with odorous pollutants

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Weidong Li ◽  
Jianguo Ni ◽  
Shaoqin Cai ◽  
Ying Liu ◽  
Chenjia Shen ◽  
...  
Keyword(s):  
Community Structure ◽  
Microbial Community ◽  
Microbial Community Structure ◽  
Differential Expression Analysis ◽  
Enrichment Analysis ◽  
Community Structures ◽  
Industrial Emissions ◽  
Gas Treatment ◽  
Kegg Pathways ◽  
Microbial Community Structures

AbstractEngineered microbial ecosystems in biofilters have been widely applied to treat odorous gases from industrial emissions. Variations in microbial community structure and function associated with the removal of odorous gases by biofilters are largely unknown. This study performed a metagenomic analysis to discover shifts in microbial community structures in a commercial scale biofilter after treating odorous gas. Our study identified 175,675 functional genes assigned into 43 functional KEGG pathways. Based on the unigene sequences, there were significant changes in microbial community structures in the biofilter after treating odorous gas. The dominant genera were Thiobacillus and Oceanicaulis before the treatment, and were Acidithiobacillus and Ferroplasma after the treatment. A clustering analysis showed that the number of down-regulated microbes exceeded the number of up-regulated microbes, suggesting that odorous gas treatment reduced in microbial community structures. A differential expression analysis identified 29,975 up- and 452,599 down-regulated genes. An enrichment analysis showed 17 classic types of xenobiotic biodegradation pathways. The results identified 16 and 15 genes involved in ammonia and sulfite metabolism, respectively; an analysis of their relative abundance identified several up-regulated genes, which may be efficient genes involved in removing odorous gases. The data provided in this study demonstrate the changes in microbial communities and help identify the dominant microflora and genes that play key roles in treating odorous gases.

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