同海大学 Tongji University 1.Discrete particle settling The particle maintains its individuality and does not interact with neighboring particles,does not change in size,shape,or density during the settling process.Particles are i usually in low solid concentration,and maintain l a constant settling velocity For example,the removal of grit or sand in preliminary treatmentTongji University 1. Discrete particle settling The particle maintains its individuality and does not interact with neighboring particles, does not change in size, shape, or density during the settling process. Particles are usually in low solid concentration, and maintain a constant settling velocity. For example, the removal of grit or sand in preliminary treatment