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A generalized sewage treatment system consists of a sequence of physical, biological, and chemical processes that remove contaminants from wastewater before it is safely discharged or reused. The objective is to protect public health, conserve water resources, and promote environmental sustainability, which are essential components of smart cities. Generalized Flow Diagram of Sewage Treatment System: ``` Domestic / Industrial Sewage │ ▼ Screening Chamber (Removal of large solids and debris) │ ▼ Grit Removal Chamber (Removal of sand, gravel and grit) │ ▼ Primary Sedimentation Tank (Settling of suspended solids) │ ▼ Biological Treatment (Aeration Tank / Activated Sludge Process) │ ▼ Secondary Clarifier (Separation of treated water and biomass) │ ├──────────────► Return Activated Sludge │ │ │ └── Back to ______ ________ ____ ________ ____ _________ _____ _____ _______ ___ ________ _________.
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