It is the system and infrastructure of collecting, treating and disposal of sewage. There are three types of sewerage systems. Separate System, Partially Separated System & Combined System. Separate Sewerage System.
Manholes are masonry or RCC chambers constructed at suitable intervals along the sewer lines for providing access into them. They are used to carry out inspection, cleaning and removing obstruction in the sewer line.
Sanitary Engineering is the ranch of public health engineering dealing with collection, conveyance, treatment and disposal of wastes, Sewage is the waster or foul water of the community conveyed by sewer
It consists of removal of floating material (like dead animals, tree branches, papers, plastics, wood pieces, vegetables peels etc) and also the heavy settleable inorganic solids (grit etc). Preliminary treatment includes: Screening, Comminutors, Grit Removal, Skimming Tank etc