Investigating the Steady-State Rheological Properties of Activated Sewage Sludge for Effective Post-Treatment

Pipeline transportation has become an effective way to transport sludge from wastewater treatment plants due its high efficiency, low operating cost, and environmental pollution. Before designing optimizing the sludge-conveying pipeline, it is first necessary analyze rheological properties of sludge. In this paper, activated with varying volume concentrations (Cw) 2.38%, 3.94%, 5.39% was used as research object. Under three temperature (T) conditions 293 K, 298 303 concentration were investigated, based on results, a model established. The experimental results indicated that upward downward paths shear stress change curve generally similar but did not overlap, hysteresis loop formed between two characteristics thinning. limiting viscosity different increased increase in concentration. This phenomenon caused by differences internal flocculent network structure fluid flow effects. At rates, experiment decreased temperature. stability test weakened Additionally, rate then stabilized, exhibiting thinning characteristics. above described using Bingham Herschel–Bulkley models.