Abstract: A process is disclosed which includes separating selected solids from a process stream with a selected solids mechanical processor containing a filter to produce a filtrate substantially free of selected solids and a retentate containing recovered selected solids. In one embodiment, the process stream contains an increased amount of liquid is provided to a downstream mechanical processor as compared to a process stream having no selected solids mechanical processor upstream. The selected solids mechanical processor can be a dynamic filtration device or a static separation device. Bio-oil recovery efficiency, quantity, and quality can be improved as a result.