Decentralised STPs_ Ramprasad_2013
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Transcript of Decentralised STPs_ Ramprasad_2013
An Appropriate Technological Solution for Sewage Treatment -
Decentralized STPs
Workshop cum Training program on Promoting water use efficiency across urban water sector
Bangalore13th Dec 2013
WATER : What is the issue?• Economic growth : without
corresponding infrastructure
• Urbanization – Increasing density of population in
cities/towns – apartments/commercial buildings
– Expanding peripheral areas : Bangalore – new areas developing!
• Huge increase in water consumption Where is the water coming from ?– Rivers, Lakes, Ponds …..and now,
mainly Ground water!
WATER : Next issue!• Sources of water drying up
• A larger issue coming up –– Contamination of Water Sources
• The way we dispose off waste water is the biggest issue in water management!
Report Summary• Citizens’ Seventh Report on the State of India’s Environment,
“Excreta Matters: How urban India is soaking up water, polluting rivers and drowning in its own excreta” – by Centre for Science and Environment, New Delhi
• Report released in May 2012 – covering 71 cities of India, research over 3 ½ years
• The report spells out a six-fold strategy for managing water and waste in its last chapter “The agenda for water to water”.
Source : http://www.indiawaterportal.org/post/26422
and http://cseindia.org/userfiles/excreta-matter.pdf
How big is the waste water problem?
• Total sewage water in Class I and II Cities India – 38254 MLD
– Only 11787 MLD (35%) Capacity to treat
– Actual treated – only around 8250 MLD (22 %)
• Current Scenario– Increase in demand and cost of water
– Stringent waste water disposal norms
– Increased contaminants from industries
– Urbanization leading to large Sewage generation
– Untreated sewage leading to severe water pollution - severely impacting ground water availability & quality.
What is “Decentralized” sewage treatment?
• Current system : sewage is the responsibility of the Government / public authorities
• But – how can public authorities manage :– Cost : widely spread out
“development”, apart from untenable economics
– Pipe connections – Land availability – for “centralized”
treatment plants
• On-site, Local Treatment –“Decentralized” STP Gives water back for reuse. (40% of all water requirement)
Recognize and manage Sewage
• Recognize and manage Sewage : 78 % officially not treated and let out into rivers, lakes, ground– Sewage generated = 38,255 mld– Capacity to treat = 11,788 mld (30%)– Sewage actually treated = 8,251 mld
(22%)
• Improper Sewage disposal - the dangers : Spread of disease, contamination of soil and pollution of ground water
• Quote from Report : “Sewage must be our obsession”
• Quote : “Mantra is Decentralization”
Why Decentralized ? Local benefits!
• On-site treatment and discharge – Reduces load on existing
sewage system
– Local treatment and discharge –protects contamination of water sources (rivers, water bodies, ground water)
• Domestic Water consumption : Over 30 % for flushing, washing facilities etc – NON CONTACT applications– Suitable for RECYCLED water
Urban reuse of water• Current cycle :
– Ground water -> Usage -> Sewer system -> Water bodies/environment disposal
UNSUSTAINABLE !
• Required cycle :– Less ground water -> Less usage -> TREATMENT-> Recycle for
non-potable applications -> Recharge of ground water / safe disposal in water bodies or environment
• Rain water harvesting – good start.However -> Sustainable water management : only thru Recycling of waste water
Average water consumption Per person
Drinking 5
Cooking 5
Total 10 7%
Bathing 55
Washing Clothes 20
Utensils washing 10
Total 85 63%
General washing 10
Toilet Flushing 30
Total 40 30%
Grand Total 135
Recyclable – about 40 % (including Gardening etc)
ONE IMMEDIATE SOLUTION
RECYCLE WATERAt least 40 % of Water usage in urban areas – flushing /
landscape maintenance / facilities washing
This 40 %+ water can be reclaimed and reused!
Leave behind good water for the generations to come
Enzotech Solutions : Credentials
• Started in 2006
• ISO 9001:2008 certified company
• Strong client roster – testimony to efficacy of Patented
technology.
• Over 150 Installations all over India. (A few in Africa)
• Starting Aug ’11, taken over by a team of seasoned
management professionals
• Full fledged operations : Design and R & D – Manufacturing
– After sales support
An illustrative Case Study –Office complex, Chennai
Office complex – reuse for flushing• Office on Velachery Road
• Around 300 people – daily consumption of around 12,000 Litres
• Used primarily for flushing toilets, washing hands etc.
• Entire water is now treated and reused for flushing
Office complex : progress
Final position – STP with recycling system
The Enzotech treatment process
Bar Screen
• To trap large objects
Sewage treatment
• Biological process
• Underground installation
Tertiary treatment
• Sand & Activated Carbon filter
• Ultra Filtration
• Ultra violet treatment – Online
Treated water
• Flushing of toilets
Water treatment and recycling in a hospital
Issues faced by hospital
• Sewage generated was clogging up sewage lines
• Water consumption of 4.5 Lac Litres per day
• Space available for the STP was right next to the car park
• Post STP installation :– Treated water used partly for flushing
– No issue of clogging sewage llines
Hospital installation
Right next to the car park…
EnzoMBBR system
A typical EnzoMBBR plant – with Fibre Reinforced Plastic (FRP) tanks
Thank you