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Regarding the price of meat product filling in comparison with the negligible cost of the collagen casings, whole roll of the casings is discharged only on suspicion of a small cut during handling. Once the casings are designed to be biologically resistant, they represent relatively problematic waste that is nowadays rather transported to landfills. This represents a significant cost; once the role is opened, it becomes extremely voluminous. The long-term study that was carried out on a commercial scale assessed two methods of utilization: composting of highly disintegrated casings and composting of charred casings. Robust qualitative and financial analysis revealed that the composting of charred casings was more meaningful both from agrochemical and financial point of view.

The abandonment of coal energy plants in the near future will result in a substantially reduced availability of the coal fly ash broadly used as an efficient supplementary material. In line with the growth of alternative and renewable energy resources, the amount of biomass-based ash rises substantially. Nevertheless, a diverse chemical composition prevents a broader utilization of biomass-based fly ash compared to coal ash on an industrial scale. On this account, the present work is aimed at investigating the basic physical and mechanical properties of concrete mortars modified by a high volume of biomass fly ash (BFA) from wood combustion. Delivered results confirm a significant potential of BFA in the building industry. Experimental analysis of concrete mortars with BFA reveals preservation or even improvement of compressive and bending strength up to 30 wt.% cement replacement. On the contrary, higher dosages induce a gradual decrease in mechanical performance. The performed Life Cycle Assessment analysis reveals the perspective of BFA incorporation taking into account environmental issues considering the ratio between preservation of mechanical performance per normalized endpoint environmental score that allows a direct comparison with other alternatives.

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