TCS Corporate Sustainability Report 2010-11 - Tata Consultancy ...

Sewage Treatment and Reuse
Many TCS facilities have sewage treatment plants (STP). The treated effluent from the STP is tested
regularly against various national and state effluent standards and recycled for use in HVAC System
cooling tower, washroom flushing and gardening. The recycled treated sewage quantity has
increased from 268,901 kL to 306,652 kL, an increase of 8.36% (Figure 51).
The percentage of the total sewage recycled to the total water consumption has increased from 17.3%
in FY 2010 to 18.80% in FY 2011. All new TCS facilities have Sewage Treatment Plants and do 100%
22
recycling of the treated effluent .
Rainwater Harvesting
1400
1200
1000
800
600
400
200
0
350,000
300,000
250,000
200,000
150,000
100,000
50,000
0
1,234 1,242 1,253
2007-2008 2008-2009 2009-2010 2010-2011
Many TCS owned campuses have rainwater harvesting systems which collect the rain water during the
monsoons, stored in storage tanks and used for groundwater recharging (through recharging pits),
borewell recharging or for creating artificial lakes within campus. There has been 10.43% increase in
the rainwater harvesting potential at TCS sites in FY 2011 over the prior year (Figure 52).
120,000
100,000
80,000
60,000
40,000 0
20,000
22 No significant impact on biodiversity of water bodies or related habitats by discharged water and runoff.
69
1,103
Figure 50 Water Consumption (litres/FTE/mth)
140,612
Reused Water (KL)
234,701
268,901
306,652
2007-2008 2008-2009 2009-2010 2010-2011
54,745
Figure 51 Recycled water after treatment (kL)
59,358
87,602
96,741
0
2007-2008 2008-2009 2009-2010 2010-2011
Figure 52 Rainwater Harvesting Potential in cubic meter (cum)