Wastewater Treatment
ระบบบำบัดน้ำเสีย ระบบกำจัดไขมัน และน้ำมัน ระบบบำบัดน้ำเสียด้วยวิธีทางเคมี (Chemical Treatment System) ระบบบำบัดน้ำเสียด้วยวิธีทางชีวภาพ (Biological Treatment System)
Secondary Sedimentation Tank
a. General. Sedimentation or settling following biochemical processes is anessential part of secondary treatment of wastewater although it is primarily a physicalprocess. The settling tanks and operating mechanisms are of the same or similardesign as those used in primary sedimentation (see para 2-5c). The retention period isshorter than for primary sedimentation and the quantity of solids or sludge removed isusually much less. The sludge is usually transferred to digestion tanks along withsludge from primary sedimentation units (see para 2-6, see Figure 2-16).
b. Sludge Removal. Secondary sedimentation units do not require as much attention as primary units, but a regular cleaning and frequent removal of sludge is essential.
