In the area of environmental technology development, multiphase pressure drop data is an important technical base for designing waste slurry and sludge processing systems. For instance, a nuclear waste immobilization technology called nitrate to ammonia and ceramic (NAC) process (Mattus et al. 1994; Ebadian 1995) produces a mixture of water, hydrogen and ammonia gases, and gibbsite (A1203.3H20) solid. To scale-up and design the transportation and treatment system for the process, rheological data must be provided. Many operating parameters can effect the pressure drop in a pipe. These include flow velocity of each phase, the solid concentration, particle size and its chemical nature, pH value, and the temperature of the bulk flow. This study has emphasized the investigation of parameters which have the most effect on the viscosity. The solid content of the slurry, the amount of air, and the temperature have been examined.
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