同©大学 Tongji University 3.Hindered settling Also called zone settling,it refers to s suspensions of intermediate concentration,in which inter-particle forces are sufficient to hinder the settling of neighboring particles.The particles tend to remain in fixed position with respect to each other,and the mass of particles settles as a unit.A distinct solid-liquid interface formed at the top of the settling mass. For example,the removal of biomass and sludge in secondary settling facilities used in conjunction with biological treatment process.Tongji University 3. Hindered settling Also called zone settling, it refers to suspensions of intermediate concentration, in which inter-particle forces are sufficient to hinder the settling of neighboring particles. The particles tend to remain in fixed position with respect to each other, and the mass of particles settles as a unit. A distinct solid-liquid interface formed at the top of the settling mass. For example, the removal of biomass and sludge in secondary settling facilities used in conjunction with biological treatment process