Why we need to Treat Sewage

Centralised and Decentralised Sewage Treatment

Traditional municipal sewage treatment systems carry the entire sewage of the city for long distances through a network of pipes and sewers to a large central sewage treatment plant. In a decentralised system the sewage is treated locally, where it is produced, and clean water is discharged into the storm water drainage channels.

This is much more practical and efficient in many circumstances. The land requirement is small. The plants can be placed underground. In densely populated urban areas, where there is no sewer and building new ones is difficult because of lack of space, decentralised systems can be accommodated more easily. Stand-alone automatic sewage treatment plants are installed.