NDI Ventilation System for Stinking Toilets - Fusion - WeRIndia

NDI Ventilation System for Stinking Bio-toilets

NDI Ventilation System for Stinking Bio-toilets

Stinking toilet is one of most disgusting things in train journeys. These toilets are clogged and foul-smelling which often change the mind of travelers to reconsider their journey in trains.

There are many reasons for the stinking toilets. Lack of adequate water and awareness among the passengers are some common reasons.

In order to solve water problem, Railways stepped ahead and installed bio-toilets. These bio-toilets convert human waste into water and bio-gas. This is done by the action of anaerobic bacteria though a cross-ventilation system.

However, after some years of their installation, they are completely blocked and gave foul smell. Especially in old trains that have an open commode chute which stopped functioning due to the blockage of ventilation system.


In order to solve this issue, the Natural Draft Induced Ventilation System (NDIVS) had been invented by the South East Central Railway (SECR).

NDI Ventilation System was developed at the coaching depot in Bilaspur for which the SECR won the first prize of ₹3,00,000.

This system removes humidity and brings fresh air through the cross-ventilation system.

It has two funnels; one faces the forward whereas the other one will be in the reverse direction of the train. With the help of plastic pipes, both will be connected to the toilet.

As the train moves, the front-facing funnel pumps fresh air into the toilet and pushes out the foul smell through reverse-facing funnel. Thus, with the help of vacuum, the foul smell will be eliminated.

Moreover, these vacuum toilets consume lesser water than the normal bio-toilets. A normal bio-toilet consumes 10 to 15 litres of water per flush, whereas the vacuum toilet will consume only 500 ml of water.

NDI Ventilation System has been installed in 50 coaches initially. It will be implemented in the remaining coaches also in the long run.

Image Reference: Thebetterindia

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