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Building of mini digester for mesophilic anaerobic digestion
Bogomir Muršec, Peter Vindiš, 2009, strokovni članek

Opis: Anaerobic digestion is the biological degradation of organic material in the absence of air andmayimply environmental benefits with regard to waste treatment, pollution reduction, energy production, and improvements in agricultural practices. Ananaerobic digester is a system that harnesses this natural process to treat waste, produce biogas that can be converted to heat and electricity and anaerobic digestate, a soil improving material. The paper presents the building of a mini digester for mesophilic anaerobic digestion.With the mini digester the amount of biogas production (methane) from different organic wastes is observed. The basic structure is made of stainless steel, on which other components are fixed. The most important components are the eudiometers, pump and heater with thermostat, fermenters, thermometer and barometer. The experiment is made according to DIN 38 414, part 8. After building of a mini digester some experiments with different organic materials are made.
Ključne besede: mini digester, mesophilic anaerobic digestion, organic wastes
Objavljeno: 11.07.2017; Ogledov: 802; Prenosov: 72
.pdf Celotno besedilo (493,38 KB)
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Biogas as a renewable energy source
Matjaž Ošlaj, Bogomir Muršec, 2010, pregledni znanstveni članek

Opis: Renewable energy technology does not simply produce energy, heat and transport fuel, but also offers the opportunity to live in the footsteps of a reasonable future development. In Europe and other industrialized regions, the main reason for the development of renewable energy is the environment, in particular the concern in relation to global climate change and the need to improve security and diversity of energy supply. In the developing countries, they promise a new hope for renewable primary energy supply in regions without conventional energy and provide an opportunity for sustainable development. Productionof "green energy" from biogas, which is among the renewable energy sources, promises an environmentally less damaging way of obtaining energy by reducing CO emissions into the environment and reduces energy dependence on imported energy sources. Biogas production is of major importance for the sustainable use of agrarian biomass as renewable energy source.
Ključne besede: anaerobic digestion, biogas, manure, renewable energy
Objavljeno: 11.07.2017; Ogledov: 728; Prenosov: 73
.pdf Celotno besedilo (194,11 KB)
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In vitro selection and characterization of new probiotic candidates from table olive microbiota
Cristian Botta, Tomaž Langerholc, Avrelija Cencič, Luca Cocolin, 2014, izvirni znanstveni članek

Opis: To date, only a few studies have investigated the complex microbiota of table olives in order to identify new probiotic microorganisms, even though this food matrix has been shown to be a suitable source of beneficial lactic acid bacteria (LAB). Two hundred and thirty eight LAB, belonging to Lactobacillus plantarum, Lactobacillus pentosus and Leuconostoc mesenteroides species, and isolated from Nocellara Etnea table olives, have been screened in this survey through an in vitro approach. A simulation of transit tolerance in the upper human gastrointestinal tract, together with autoaggregation and hydrophobicity, have been decisive in reducing the number of LAB to 17 promising probiotics. None of the selected strains showed intrinsic resistances towards a broad spectrum of antibiotics and were therefore accurately characterized on an undifferentiated and 3D functional model of the human intestinal tract made up of H4-1 epithelial cells. As far as the potential colonization of the intestinal tract is concerned, a high adhesion ratio was observed for Lb. plantarum O2T60C (over 9%) when tested in the 3D functional model, which closely mimics real intestinal conditions. The stimulation properties towards the epithelial barrier integrity and the in vitro inhibition of L. monocytogenes adhesion and invasion have also been assessed. Lb. plantarum S1T10A and S11T3E enhanced trans-epithelial electrical resistance (TEER) and therefore the integrity of the polarized epithelium in the 3D model. Moreover, S11T3E showed the ability to inhibit L. monocytogenes invasion in the undifferentiated epithelial model. The reduction in L. monocytogenes infection, together with the potential enhancement of barrier integrity and an adhesion ratio that was above the average in the 3D functional model (6.9%) would seem to suggest the Lb. plantarum S11T3E strain as the most interesting candidate for possible in vivo animal and human trials.
Ključne besede: antibiotics, bacteria pathogen, cell metabolism, olives, probiotics, digestion
Objavljeno: 19.06.2017; Ogledov: 586; Prenosov: 274
.pdf Celotno besedilo (1,63 MB)
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Aerobic digester design for the biodegradation of plant tannins in industrial wastewater
Marko Tramšek, Andreja Goršek, 2008, izvirni znanstveni članek

Opis: This paper describes aerobic digester design for the biodegradation of plant tannins in industrial wastewater. For optimal design, using the criterion of minimal total holding time, some experimental investigations into tannins' biodegradation rate in industrial wastewater were performed in the first part of this research. The chemical oxygen demand method (COD) was applied to follow the tannins degradation rate. The kinetic parameters of a supposed Aiba's inhibition kinetic model were determined using experimental data. In the second part of the study, equations for determining the optimal volumes of two in series connected aerobic digesters were established. Furthermore, a comparison is presented of volumes between one and two in series connected aerobic digester systems regarding wastewater volume flow rate, qV = 120 m3 d-1 and wastewater treatment efficiency, COD = 9 8%.
Ključne besede: digester design, plant tannins, Aiba's inhibition kinetic model, aerobic digestion, industrial wastewater
Objavljeno: 31.05.2012; Ogledov: 1387; Prenosov: 43
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The aerobic biodegradation kinetics of plant tannins in industrial wastewater
Marko Tramšek, Andreja Goršek, Peter Glavič, 2006, izvirni znanstveni članek

Opis: This paper describes an experimental determination of the biodegradation rate for tannins present in industrial wastewater, after the extraction of chestnut chips. Experiments were performed in a laboratory aerobic reactor (Armfield) by using biomass from an existing industrial wastewater treatment plant. The outlet tannins concentration was determined under various processing conditions. Simultaneously, an optical microscope was used to monitor the mix of microbiological cultures in the biomass. On the basis of data obtained in experiments, non-linear regression was used to perform parametric analysis of various kinetic models, which took into account inhibition, as quoted in literature (Haldane, Edwards, Aiba, Luong). The statistical analysis, based on the P-criterion, F-criterion, adjusted coefficient of determination, Kolmogorov-Smirnov test and root mean squared error, showed that the biodegradation of plant tannins in industrial wastewater under selected conditions for aerobic digestion, can be most successfully described statistically by the Aiba's kinetic model.
Ključne besede: plant tannins, susbtrate inhibition, kinetic models, statistic analysis, aerobic industrial wastewater digestion
Objavljeno: 31.05.2012; Ogledov: 1287; Prenosov: 26
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