Open access publications in the SLU publication database

Abstract

The process line developed in the project is shown in Figure 1, which illustrates the different steps
from harvest of Baltic Sea blue mussels to fish feed through fly larvae composting. This report
describes the process line from Pre-process treatment (No 3.) to Post-process treatment (No 7.).
The most crucial part of the process line is the fly larvae compost, as this involves living organisms
that must be treated in certain ways to survive. SLU has long experiences of this and has operated fly
larvae composting with municipal source separated organic waste since 2011. Several tests with blue
mussels have been done in this project, where the experiences from the use of organic waste is used
as a reference. Other parts of the process line - ensilage (optional); crushing of mussels before
feeding them to the fly larvae; separation of fly larvae, shells and droppings and finally drying of fly
larvae – are more straight forward and dependent on the technical equipment that are selected.
Thus, other techniques, than those selected in this project, could be used depending on e.g.
experiences, availability, local circumstances and economy.