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ENVIRONMENTAL MANAGEMENT, ENERGY CONSERVATION & GREEN BUILDING

consortium, Chennai was the success in implementing SUSTAINABILITY: monsoons has thrown up lots of challenges for reused. It also helps in swapping the present source of
these projects. CMWSSB. Chennai with 7.5 million population and supply to industries which is a combination of surface
Water recycling offers resources and financial savings.
home to many big IT companies was reeling under a water from the city reservoirs, desalination plants and
Public awareness in utilizing the use of recycled water in This is a classic case of Waste to Wealth intervention and
severe water crisis. In order to fight against drought and groundwater with TTRO water. All these ensure high
their day-to-day usage, other than drinking purposes has illustration of the circular economy of water. Around 530
provide a permanent and sustainable solution to the water water use efficiency.
been generated by an extensive campaign involving MLD of secondary treated effluent is generated in a day in
crisis, the CMWSSB had to explore the possibility of
stakeholders like industries & IT companies, Resident Chennai city. The industrial demand is around 100 MLD The use of waterways as water storage in urban areas
augmenting the supply from both conventional and non-
Welfare associations, Gated communities, NGOs etc. which is presently met from surface water and leads to additional resource of water. Using the treated
conventional sources.
Advocacy campaign on the safety and quality of reuse desalination. By recycling and reuse of wastewater, wastewater to recharge water bodies will prevent the
water was done on a large scale. which otherwise would have been discharged into the The project is perfect illustration of a closed-loop water encroachment of dry river/lake beds during non-monsoon
waterways, an additional source of water is being supply system, wherein water is effectively recycled and period.
RESULT ACHIEVED:
generated. The production cost is lesser by around Rs.
A total of 130 ML of Secondary Treated Effluent Water 26/KL than desalination, but then it serves to be
(STEW) from the existing STPs at Koyambedu and environment friendly compared to the latter. The total
Kodungaiyur is being used as feed water for the TTRO cost inclusive of capex would be around Rs. 36/ KL. Also,
plants at the above locations which generate 90 MLD of this TTRO water is meant for industrial use for which the
TTRO water which is supplied through long pipelines of tariff is Rs. 80/ KL. This ensures better cost recovery,
60 km and 25 km respectively to around 540 industries rather is a revenue-generating activity. At current rates,
which are located in the western and northern parts of the the breakeven period is estimated to be just five years.
city.
Conservation of the water bodies reduces the stress
CMWSSB has made greywater recycling mandatory for arising due to the vagaries of monsoons. Even the worst
special buildings and multi-storied buildings for effecting drought situation can be managed with the available
new water and sewer connections. water sources.

Results achieved are: TRANSFERABILITY:

Ÿ Improvement in the availability of water for city Most of the urban local bodies in the country have an
supply by 90 MLD due to swapping of present underground Sewerage System and a Sewage Treatment
freshwater sources for industries with recycled plant or a Faecal Sludge Treatment Plant. Wastewater
wastewater. recycling and reuse system through TTRO can be
successfully implemented in any state with the
Ÿ Uninterrupted supply of water to the industries,
coordination of the Government and with the cooperation
thereby facilitating industrial growth and
of the public with proper designing of structures
employment.
according to the soil conditions and creating awareness
Ÿ Reducing the stress arising due to vagaries of sustainably as done by the CMWSSB. The product water
monsoons. can be earmarked for industrial use or agricultural use. In
times of water scarcity, it may even be used as a source of
Ÿ Water recycling offers resource and financial savings.
drinking water as it is completely devoid of any physical,
It is a revenue-generating activity as the entire product
chemical or biological contaminants. The TDS level is
water is sold to industries.
less than 70 mg/L which is much less than that of
Ÿ Reduced contamination of waterways due to reduced conventional tap water which is around 250 mg/L.
discharge of wastewater.
LESSON LEARNED:
Ÿ Conservation of water bodies and prevention of
The expansion of the city coupled with the failure of
groundwater depletion by industries.

SAF Games Village - Koyambedu.
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