同©大学 Tongji University Lesson v Sedimentation Tang Yulin March 2017
Tongji University Lesson V Sedimentation Tang Yulin March 2017
同©大号 Tongji University Second pump station Raw water 个 Coagulation- Settler Tank High-speed flocculation Tank (Multifo) Filter Tank Backwash Pre-thickener Sludge Buffer wastewater tank Tank Sludge Dewatering Sludge balance Thickener process Tank Tank
Tongji University Coagulationflocculation Tank Settler Tank （Multifo） High-speed Filter Tank Raw water Second pump station Backwash wastewater Pre-thickener tank Thickener Tank Sludge Buffer Tank Sludge balance Tank Sludge Dewatering process
同©大学 Tongji University Description Sedimentation or Settling is employed for the removal of suspended solids that are heavier than water by gravity separation, such as the removal of grit,Total Suspended Solid (TSS)in primary settling basins,biological floc in activated sludge basin,and chemical floc when chemical flocculation is used. Sedimentation is the most widely used physical process in water treatment,with low cost,simple maintenance,and high efficiency.It may appear more than once in a treatment flow chart. Another kind of sedimentation is Accelerated Gravity Settling which removes particle in an accelerated flow field.but,it is not widely used
Tongji University Description • Sedimentation or Settling is employed for the removal of suspended solids that are heavier than water by gravity separation, such as the removal of grit, Total Suspended Solid (TSS) in primary settling basins, biological floc in activated sludge basin, and chemical floc when chemical flocculation is used. • Sedimentation is the most widely used physical process in water treatment, with low cost, simple maintenance, and high efficiency. It may appear more than once in a treatment flow chart. • Another kind of sedimentation is Accelerated Gravity Settling which removes particle in an accelerated flow field. but, it is not widely used
同©大学 Tongji University I. Types of Sedimentation Based on the concentration and the nature of particle, especially the tendency of particle to interact with neighboring ones. 4 types of gravitational settling can occur,including 1.Discrete particle settling, 2.Flocculent settling, 3.Hindered or Zone settling, 4.Compression settling
Tongji University I. Types of Sedimentation Based on the concentration and the nature of particle, especially the tendency of particle to interact with neighboring ones. 4 types of gravitational settling can occur, including: 1.Discrete particle settling, 2.Flocculent settling, 3.Hindered or Zone settling, 4.Compression settling
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 treatment
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 usually in low solid concentration, and maintain a constant settling velocity. For example, the removal of grit or sand in preliminary treatment