Step 1: Briquetting is a biomass densification process.
Step 2: In this process, loose biomass residues are compressed into compact solid fuel blocks called briquettes.
Step 3: Briquettes have higher bulk density, better handling properties, and improved fuel quality.
Step 4: Briquetting can produce high quality fuel with low ash content.
Step 5: Therefore, the correct process is:
\[
\boxed{\text{Briquetting}}
\]