Sewage is waste matter such as fecal matter or dirty water from homes and work forces or human population from factories, which flows away through sewers.
It is characterized by volume or rate of flow, physical condition, chemical and toxic constituents, and its bacteriologic status (which organisms it contains and in what quantities)
Pollutants in Sewage generally analysed by measuring parameters such as
BOD 5, mg/lit, (Biological Oxygen Demand)
COD, mg/lit (Chemical Oxygen Demand)
TSS, mg/lit,(Total suspended solids)
To satisfy our day to day water need, (considering 135 liter/person/day usage (Indian Norms), our usage of water broadly distributed as mentioned in figure 1
After using water for these domestic application, polluted waste water formed as Sewage drains down. This sewage water generally comprises of 1 % impurity an 99 % water. If this 1 % impurity is removed certainly this treated water can be reused for various non-potable applications.