|Thiamine (Vitamin B1)|
|Ascorbic Acid (Vitamin C)|
|Pyridoxine (Vitamin B6)|
|Niacin (Vitamin B3)|
|Pantothenic Acid (Vitamin B5)|
|Cobalamin (Vitamin B12)|
|Folate (Vitamin B9)|
|Riboflavin (Vitamin B2)|
|Retinol (Vitamin A)|
|Retinol Acetate (Vitamin A Acetate)|
|Cholecalciferol (Vitamin D3)|
|Ergocalciferol (Vitamin D2)|
|Tocopheryl Acetate (Vitamin E Acetate)|
|Phylloquinone (Vitamin K1)|
|Ash (Acid Insoluble)|
|Gross Calorific Value|
|Net Calorific Value|
|Ash Shrinkage Starting Temperature (Oxidising)|
|Ash Deformation Temperature (Oxidising)|
|Ash Hemisphere Temperature (Oxidising)|
|Ash Flow Temperature (Oxidising)|
|Ash Shrinkage Starting Temperature (Reducing)|
|Ash Deformation Temperature (Reducing)|
|Ash Hemisphere Temperature (Reducing)|
|Ash Flow Temperature (Reducing)|
Ash Shrinkage Starting Temperature (SST) - This occurs when the area of the test piece of Switchgrass ash falls below 95% of the original test piece area.
Ash Deformation Temperature (DT) - The temperature at which the first signs of rounding of the edges of the test piece occurs due to melting.
Ash Hemisphere Temperature (HT) - When the test piece of Switchgrass ash forms a hemisphere (i.e. the height becomes equal to half the base diameter).
Ash Flow Temperature (FT) - The temperature at which the Switchgrass ash is spread out over the supporting tile in a layer, the height of which is half of the test piece at the hemisphere temperature.
At Celignis we can provide you with crucial data on feedstock suitability for AD as well as on the composition of process residues. For example, we can determine the biomethane potential (BMP) of Switchgrass. The BMP can be considered to be the experimental theoretical maximum amount of methane produced from a feedstock. We moniotor the volume of biogas produced allowing for a cumulative plot over time, accessed via the Celignis Database. Our BMP packages also involve routine analysis of biogas composition (biomethane, carbon dioxide, hydrogen sulphide, ammonia, oxygen). We also provide detailed analysis of the digestate, the residue that remains after a sample has been digested. Our expertise in lignocellulosic analysis can allow for detailed insight regarding the fate of the different biogenic polymers during digestion.
At Celignis we can determine the bulk density of biomass samples, including Switchgrass, according to ISO standard 17828 (2015). This method requires the biomass to be in an appropriate form (chips or powder) for density determination.
Our lab is equipped with a Retsch AS 400 sieve shaker. It can accommodate sieves of up to 40 cm diameter, corresponding to a surface area of 1256 square centimetres. This allows us to determine the particle size distribution of a range of samples, including Switchgrass, by following European Standard methods EN 15149- 1:2010 and EN 15149-2:2010.
The processing of lignocellulosic materials in modern biorefineries will allow for the
production of transport fuels and platform chemicals that could replace petroleum-derived
products. However, there is a critical lack of relevant detailed compositional information
regarding feedstocks relevant to Ireland and Irish conditions. This research has involved the
collection, preparation, and the analysis, with a high level of precision and accuracy, of a
large number of biomass samples from the waste and agricultural sectors. Not all of the
waste materials analysed are considered suitable for biorefining; for example the total sugar
contents of spent mushroom composts are too low. However, the waste paper/cardboard
that is currently exported from Ireland has a chemical composition that could result in high
biorefinery yields and so could make a significant contribution to Irelandís biofuel demands.
Switchgrass (Panicum virgatum), a perennial grass native to North America, is a promising energy crop for bioethanol production. The aim of this study was to optimize the enzymatic saccharification of thermo-mechanically pretreated switchgrass using a thermostable cellulase from Geobacillus sp. in a three-level, four-variable central composite design of response surface methodology. Different combinations of solids loadings (5 to 20%), enzyme loadings (5 to 20 FPU g-1 DM), temperature (50 to 70 oC), and time (36 to 96 h) were investigated in a total of 30 experiments to model glucose release from switchgrass. All four factors had a significant impact on the cellulose conversion yields with a high coefficient of determination of 0.96. The use of higher solids loadings (20%) and temperatures (70 oC) during enzymatic hydrolysis proved beneficial for the significant reduction of hydrolysis times (2.67-times) and enzyme loadings (4-times), with important implications for reduced capital and operating costs of ethanol production. At 20% solids, the increase of temperature of enzymatic hydrolysis from 50 oC to 70 oC increased glucose concentrations by 34%. The attained maximum glucose concentration of 23.52 g L-1 translates into a glucose recovery efficiency of 46% from the theoretical yield. Following red yeast fermentation, a maximum ethanol concentration of 11 g L-1 was obtained, accounting for a high glucose to ethanol fermentation efficiency of 92%. The overall conversion efficiency of switchgrass to ethanol was 42%.