Hello Ian, To answer your ...

Hello Ian,

To answer your question: only 21 % of wastewater gets treated before being discharged into water bodies. One way of controlling the pollution of water bodies due to wastewater discharge is to have a number of decentralised wastewater treatment system instead of having a few centralised wastewater treatment system. It is found from studies that while designing the capacity of wastewater treatment plants, the rural population (residing in suburban areas) are not considered. If centralised treatment system is being considered then it should be designed for urban as well as rural population and also considering the population projection.