Simulation and Experimental Study on Iron Impregnated Microbial Immobilization in Zeolite for Production of Biogas

“…PVP can bind toxic compounds in the medium and has a high water-binding capacity. According to recent reports, the addition of specific micronutrients to the microbial support increases the microbial film capacity to attach and grow on the support surface [41]. Experiments proved that when a carrier is prepared in this way, it may effectively reduce inhibitor substances in the anaerobic digestion of wastewater.…”

Section: Enzyme Activity and Counts Of Immobilised Bacteriamentioning

confidence: 99%

Kraft Lignin Grafted with Polyvinylpyrrolidone as a Novel Microbial Carrier in Biogas Production

2018

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The objective of this study was to verify the effect of kraft lignin as a microbial carrier on biogas/methane yield. An anaerobic co-digestion test process was carried out, in which confectionery waste was used with sewage sludge. At the first stage of the study pure lignin and lignin combined with polyvinylpyrrolidone (PVP) were subjected to an extensive physicochemical analysis. Their morphology, dispersion and adsorption properties were determined. The two materials were also subjected to thermal, spectroscopic and elementary analysis. The anaerobic digestion of the two substrates was carried out with and without the addition of the carrier, under mesophilic conditions and in periodic operation. The monitoring and analysis of the two essential parameters, i.e., pH and volatile fatty acids/total alkalinity (VFA/TA) ratio, revealed that the process was stable in both tests. Microbial and biochemical analyses showed intensified proliferation of eubacteria and increased dehydrogenase activity in samples prepared with the lignin + PVP material. The cell count increased by 46% in the stuffed wafers (WAF) + sewage sludge (SS) variant with the carrier, whereas the enzyme activity increased by 43%. Cell immobilisation noticeably improved the process efficiency. The biogas production increased from 722 m3 Mg−1 VS to 850 m3 Mg−1 VS (VS – volatile solids), whereas the methane production increased from 428 m3 Mg−1 VS to 503 m3 Mg−1 VS (by about 18%). The research proved that lignin could be used as a very effective microbial carrier in anaerobic digestion (AD).

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“…The presence of macropores mainly lead to has a larger specific surface area (halloysite 49.4 m 2 /g and zeolite 30.3 m 2 /g), which may enhance the colonization of microorganisms involved in anaerobic digestion. The bacterial biofilm attached on the minerals’ surface is less prone to washout compared with the suspended microorganism in the feedstock solution [ 7 ]. Notwithstanding, the findings of this paper require further investigation, such as analyzing the microbial community on the mineral surface.…”

Section: Resultsmentioning

confidence: 99%

“…COD removal in batch anaerobic digestion with zeolite has also been reported previously. Purnomo et al [ 7 ] showed that during batch anaerobic digestion of maize silage and cutlery manure, COD concentration decreased by up to 34% compared to the control. Meanwhile, Wang et al [ 51 ] reported that the addition of zeolite resulted in COD removal of up to 75% in anaerobic digestion of organic wastes.…”

Section: Resultsmentioning

confidence: 99%

“…The sorbents are porous materials characterized by their ability to: (i) lose and gain water reversibly, (ii) adsorb molecules with an appropriate cross-sectional diameter, and (iii) exchange their constituent cations without a major change in their structure [ 4 ]. Mineral sorbents’ porous structure and their ability to exchange constituent cations allow for the reduction of toxicity in the environment (e.g., the reduction of ammonia and ammonium ion concentrations in the solution) [ 5 ], supplementation (e.g., Ca 2+ and Mg 2+ ions released from zeolite) [ 6 ], and immobilization of microbial cells (e.g., high capacity for colonization of microorganisms on their surface) [ 7 ]. The most commonly described mineral sorbents used to enhance the anaerobic digestion process are zeolites [ 8 ].…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2020

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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.

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Simulation and Experimental Study on Iron Impregnated Microbial Immobilization in Zeolite for Production of Biogas

Cited by 28 publications

References 18 publications

Bioenergy Potential from Agricultural Residues and Industrial Wastes in Indonesia

Bioenergy Potential from Agricultural Residues and Industrial Wastes in Indonesia

Kraft Lignin Grafted with Polyvinylpyrrolidone as a Novel Microbial Carrier in Biogas Production

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

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