Dynamic time sweep measurement of sludge for four different concentrations (3%, 4%, 5% & 5.5%) at four different gas flow rates (1 Lpm to 7 LPM).

The sludge samples were measured at various gas flow rates (1 LPM to 7 LPM). The dynamic time sweep measurements were generated from the sludge sample first without gas at 0.09% strain across 25 minutes.

Then the sample was conditioned and the gas was injected for 20 minutes before the measurement at similar conditions. Similar procedure was repeated for different concentrations The measurements were carried out on a DHR-3 rheometer (TA-Instruments), equipped custom made cup. For detail procedure refer: Bobade, V, et al. 2017, 'Impact of gas injection on the apparent viscosity and viscoelastic property of waste activated sewage sludge', Water Research , vol. 114, pp. 296-307.