Work Package 1

Characterization of recycled waste Wood materials and selection criteria for pretreatment steps 

An assessment of the mobilization potential of recycled waste wood within the participating European countries Germany, Slovenia, Finland and UK will be carried out by determining the chemical and physical composition of recycled waste wood mixtures and the technical specification for processing it as feedstock in a biorefinery process.

 Workpackage Leader

Dr. Miha Humar; Dr. Boštjan Lesar

University of Ljubljana

Work Package 1.1

Collection and selection matrix

In order to perform this task, samples from all partner countries will be collected and a selection matrix based on the findings of WP 1.2 to WP 1.4 will be drafted.

Work Package 1.2

Anatomical Characterization of waste wood mix

Project partners will provide waste wood mixtures of different origin, and of different time frames, as it is well known that the quality of the waste wood mixture varies with time. In the first step the moisture content will be determined with oven dry methods. Secondly, density of the respective particles of the mixture will be determined. In the last step the presence of the predominant wood species will be determined. Special emphasis will be given into the differentiation of the hardwoods and softwood as they differ in lignin structure and quantity, and thus require different pre-treatment conditions. Macroscopic and microscopic techniques will be utilised.

 

Work Package 1.3

Chemical composition of waste wood mix

Another parameter that defines further processing is chemical composition of recovered wood. In order to elucidate it, samples will be analysed with standard methods. Samples will be milled (Retch SM2000, Retch MM200) into sawdust and afterwards homogenised. For determination of lignin and cellulose content classical wet chemical analysis will be performed. Namely, insoluble solids will be determined according to the recommendation of NREL/TP-510-42621. Lignin content and carbohydrate composition will be determined according to the NREL standard NREL/TP-510-42618 or similar procedures based on the acid hydrolysis. In parallel FTIR analysis will be performed to obtain a high quality spectrum, which allows a determination of potential past fungal degradation. Determination of the necessary additional grading expenses, purification measures and the associated procedures will be provided.

 

Work Package 1.4

Contamination of waste wood mix

Inorganic contaminates decrease the value of the waste wood mixes as they have negative influence on several pre-treatment processes. Thus, in the last step of the characterization of the recycled waste wood mix the presence of inorganic pollutants will be determined. Special emphasis will be given to the characterization of contaminants, namely surface coatings, biocides, inorganic debits and others and the statistical analysis of recycled wood composition as it varies greatly throughout the year. For chemical analysis X-ray fluorescence spectroscopy will be utilised (Oxford instruments, TwinX).