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First Green Train Corridor in India
Jul 27, 2016

In order to contribute to mission ‘Swachh Bharat Abhiyan’ Indian Railways have taken up a big task of providing human discharge free bio-toilets in all its coaches and the same would be completed by September 2019.

  • With provision of bio-toilets in all its coaches discharge of human waste from trains on to the ground would be completely stopped which in turn would help in improving cleanliness and hygiene.
  • Indian Railways have already provided 40,750 bio-toilets in its coaches till 30th June, 2016 and in the current financial year, it is planned to fit additional 30,000 bio-toilets.
  • Indian Railways inaugurated ‘First Green Train Corridor-Rameswaram-Manamadurai’ free from human waste discharge from trains on 24 July.
  • The Rameswarm-Manamadurai (114 kms) track was identified to make it Green Train Corridor—free from human waste discharge from trains.
  • Accordingly, 10 passenger trains consisting of 286 coaches moving over this section have been provided with bio-toilets.
  • After Rameswarm-Manamadurai, Okha-Kanalas Junction (141 kms), Porbandar-Wansjaliya (34 kms) and Jammu-Katra (78 kms) would also be taken up for making them free from human waste discharge from trains.

For this around 35 trains consisting of nearly 1110 coaches would be further provided with bio-toilets and the work is underway. These sections and stations were chosen, because the number of trains originating and terminating at these stations and sections are few, thus making it operationally easier and faster to make them human-discharge free.

  • Indian Railways in its commitment to provide hygienic environment to passengers and to keep station premises/tracks clean, have developed environment-friendly Bio-toilets for its passenger coaches.
  • The technology has been developed jointly by Indian Railways and Defence Research & Development Organization (DRDO) for railway passenger coaches through an MoU.
  • This environment friendly, low cost and robust technology, is the first of its kind in Railway Systems in the world.
  • In the bio-toilet fitted coaches, human waste is collected in tanks below the toilets and the same is decomposed by a consortium of bacteria.

How do the Bio-Toilet works ?

Bio-Digester or bio-toilet is a decomposition mechanized toilet system which decomposes Human Excretory Waste in the digester tank using specific high graded bacteria further converting it into methane and water, discharged further to the desired surface.

  • Bio-digester technology treats human waste at the source.
  • A collection of anaerobic bacteria that has been adapted to work at temperatures as low as -5°C and as high as 50°C act as inocula (seed material) to the bio-digesters and convert the organic human waste into water, methane, and carbon-dioxide.
  • The anaerobic process inactivates the pathogens responsible for water-borne diseases and treats the fecal matter without the use of an external energy source.
  • The only by-products of the waste treatment process are pathogen-free water, which is good for gardening, and bio-gas, which can be used for cooking.
  • Bio-toilets do not require sewage connectivity and because the process is self-contained, bio-toilets are also maintenance-free.
  • The bacteria used in the bio-toilet have been collected and analysed by DRDO from Antarctica and the efficiency of this system has been tested in extreme climates and conditions.


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