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![Page 1: Technische Universitaet Muenchen – Institute for Advanced Study STOA Annual Lecture, Brussels, 29-11-2011 Managing Water Supply and Sanitation in a Crowded.](https://reader036.fdocuments.in/reader036/viewer/2022062417/55152b9e550346a87d8b564e/html5/thumbnails/1.jpg)
Technische Universitaet Muenchen – Institute for Advanced Study
STOA Annual Lecture, Brussels, 29-11-2011
Managing Water Supply and Sanitationin a
Crowded World
Peter A. WildererMunich, Germany
problems & solutions
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7 billion people on Earth
more alarming is compression of people in specific areas
> 60% live in coastal zones
> 50% live in cities
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the consequence:
amplified by:
• globalization of „western“ lifestyle
• progress of complexity
demand:
• water• food• energy• land• etc.
pollution:
• air• water• soil• mindset• etc.
local increase of demand and pollution
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on the other side
locally available resources are limited
pollution and over-abstraction
deteriorate quantity and quality of resources
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sequence of causes and results
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the traditional approach to solution:
increased exploitation of natural resources
lossof
eco-system function
what did James Lovelock say?„eco-system function warrants life on Earth “
- control of surface temperature
- control of precipitation paterns- ability to absorb disturbances (resilience)
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we are faced with global crises: the big 4
ecosystem dysfunction
destabilization(societies & economies)
deficiency of resources
climate change
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all 4 crises are delicately interwoven
balancingclimate
perservingecosystem function
satisfying demands
stabilizingsocieties & economies
to keep our eco-socio-economic system stabel
all 4 crises are to be solved
simultaneously
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concerted action is required to reach solution
ecosystem dysfunction
destabilization(societies & economies)
deficiency of resources
climate change
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„water“ plays an overarching role
preservating ecosystem function
stabilizing - societies - economies
securing supply of food - water - health
mitigating climate impacts
water resources management – build-up of urban water infra-structure
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our current approach: copied from ancient Romans
water is used just once
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our current approach: upgraded during the past 150 years
in-appropriatewhen water is scarce
WWtreatment
pumps waterwork
sewer pipes
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the smart way of using water
applying
innovative technology
for
converting wastewater into water ready for use
notice:
wastewater is a resource
urban water reuse
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urban water reuse
goal: • minimization of water abstraction from natural resources
• minimization of costs for sewer installation
• minimization of time for installation
targets: • peri-urban agriculture - parks - gardens
• housing areas• high-rise buildings• hotel complexes• enterprises
- not yet properly served- in water stressed areas
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roof-top hydroponics using customized recycling water
• yield: 22 t/year of leafy vegetables
• installation costs: ca. 30,000 Euro (olympic swiming pool size)
growth of leafy vegetables for direct human consumptionby spraying treated wastewater to the roots
result: - reduced fresh water abstraction
- reduced demand of land for agriculture
- reduced need for transportation (water, food)
Changi General Hospital – Dr. Chow
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solution for a housing area
water purification underneath a court yard
purified water for• toilet flushing
• cleaning• landscape irrigation
steep gravity sewer:
low demand offlushing water purification
plant
Abwasser
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airplane shower
allow passengers to shower
with 15 liters of water only
applicable also for commercial laundries
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Urban Sustainability Centre - London
Siemens AG
Forum and Exhibition Hall
Themes:• decentralized energy generation• e-mobility infrastructure• decentralized water treatment and reuse• tele-communication
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dezentralization requires central monitoring & control
DeSa/R: Decentralized Sanitation and Reuse
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summary
solution of the big 4 global challengesrequires concerted action
smart use of watermakes the trick
• water reuse is an option to be considered when water is scarce
• helps satisfying the needs of people, industry and ecology alike
water reuse in urban areas (not yet served)requires decentralization of water purification technology
technology of decentralized water managementrequires participation, innovation, demonstration and proper regulation
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participation
end-user
• regulators
• teachers
• city planers
• architects
• engineers
• operators
• scientists
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