Page 71 - March 2020 - WT Site

800 KLD STP at Chennai 60 KLD STP + 300 kg food waste
at Bangalore

• Less skilled maintenance

• Less moving parts in the system
• Use of gravitational forces as part for energy requirements
its modifications. The designer should consider various options The designer should consider above points to make the flow
of combination of the technologies for a given situation and sheet sustainable and profitable. Such facilities get social attention
make the entire process flow sheet sustainable.
and can be replicated itself if proper planning and designs are
Consider decentralized waste management as an industry as shown incorporated considering already mentioned issues.
in the image we realize that raw material is free and reliable, end
products has demand (biogas & treated water) and by products A typical working case studies designed considering above issues.
sludge has a fertilizer value. This is the only industry on the earth
where nothing goes waste. Hence, it is a very sustainable option. The treated water of 800 KLD STP is being used for toilet flushing
and gardening. The biogas utilization for power generation is on
For any flow sheet to be sustainable, many parameters should be the cards
part of the design while selection of the technologies.
60 KLD STP and 300 kg food waste facility is producing biogas
• Wastewater should not be seen during the process of being used for cooking in the club further treated water is used
treatment for gardening.

• Very less power
• No noise and vibrations
About the Authors
• Less sludge production Dr. D. N. Ravi Shankar is specialized in wastewater recycle and
reuse and was former Technical Advisor to GoI for BWSSB.
• Less foot print
He has provided consultancy to many private as well as
• No odour governments offices. He is on the Expert committee formed
by Government of Karnataka to identify alternate sources of
• Biogas should be part of the design both from solid and drinking water to Bangalore city. He can be contacted at dnr@
liquid waste and overall design should be energy positive greenlantern.in

Water Today - The Magazine l March 2020 73