Page 91 - Swachhata Chronicles – Transformative Tales from India (eBook)

How the settler and CW work: The settler 45 mg/litre Biochemical Oxygen Demand
and CW systems follow a multi-stage (BOD), which will be reduced to 20 per
treatment process before it enters the main cent. In the second stage the treated water
channel. In the first stage, the greywater passes through a settler with two chambers
undergoes a three-step screening system and finally enters a CW with baffled walls
that features floating traps of large, medium (consisting of aggregates 40mm and
and small sizes to trap particles. The treated 20mm) placed at an interval of every 10
water then passes through a silt trap that metres, and canna indica plants. In the third
was constructed based on the size of the and final stage, the BOD is reduced to 8 mg/
population and the water discharged, and litre, which is within the permissible limit.

utcome

The implementation of the GWM unit
will ensure that greywater is properly

treated and utilized for agricultural
purposes.

Swachhata Chronicles: Transformative Tales from India 71