Rheology properties are considered to be essential for designing a bioreactor to understand the flow behavior of materials inside the reactor. In this regard, rheological measurements of sago processing wastewater with different starch concentrations ranged 10, 20, 30, 40, 50, 60, 70, and 80 g L-1 were evaluated. The sago wastewater with a starch concentration of 10 and 20 g L-1 indicated a non- Newtonian behavior, showing yield stress and shear thinning. Based on the results, it is concded that sago wastewater with starch concentrations up to 20 g L-1 could be well suited for airlift bioreactors used for the microbial lipid production process.
Key words : Sago wastewater, Starch, Rheology, Shear stress, Viscosity.