The Future of Municipal Water Services - Ashbolt

31 Pages·2016·3.59 MB·English

by  Virginia Couse

Future Albertan Community
Water Services
Nicholas ASHBOLT
([email protected])
Yang LIU (Civil & Environ Engineering)
Alberta Innovates – Health Solutions
Translational Health Chair in Water
Future of Municipal Water Services, October 5th, 2016
Points to be addressed
• We all have a water service problem!
• Thinking within the Circular Economy
• One-Health and One-Water need
• Living more within our community limits
and prospering from it
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We all have a
water service
problem
 Upgrading aging
wastewater collection
systems and treatment
plants in Canada is
estimated to cost $82 billion
 Separation of combine
sewer systems problematic
 What to build for new
communities??
2016 Canadian Infrastructure report
3
Potable water assets in Canada in Wastewater assets in fair, Stormwaterassets in fair, poor Roads & sidewalks in fair, poor
fair, poor or very poor condition poor or very poor condition or very poor condition or very poor condition
Replacement Replacement value
Full replacement cost Total replacement
value of assets of stormwater
of wastewater cost of
in fair, poor or very Assets in current Assets in fair, poor or Roads & sidewalks in fair,
poor condition need of attention very poor condition poor or very poor condition
www.canadainfrastructure.ca/Canadian Soc Civil Eng (CSCE), Canadian Pub Works
Assoc (CPWA), Canadian Construction Assoc (CCA), Fed Canadian Municipalities
http://dailycommercialnews.com/Infrastructure/News/2016/1/
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Current urban water service system
Surface/
Water
Ground Household
treatment
water
Pathogens
Nutrients
Septic tank /
Drugs
Challenges leachfield
Toxins
• Water services utilize ~3-7% of a nation’s electricity (yield 3% GHG) but
some 40-60% of a municipality’s energy bill!
+ 14% for hot water (household heating 29% & cooling 17%)*
• Canadian old water service infrastructure $172 billion to maintain**
• Sewer/septic system releases – major cause of eutrophication/disease
• Fire fighting system with potable water biggest infrastructure cost factor
*www.eia.gov/consumption/residential/
**dailycommercialnews.com/Infrastructure/News/2016/1/
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Energy Intensive Wastewater Treatment
• Municipal wastewater treatment
and collection are energy intensive
(1-4% total national electricity load)
• Energy used WWT 0.3–2.1 kW h/m3
• Aeration consumes 55-70%
• Total energy content of municipal
wastewater approx 23 W/capita in
Pumping and mixing
COD; & 6 & 0.8 W/capita (N&P)
Sludge dewatering
• Domestic wastewater contains
energy which represents 3-5 times
COD degradation
the energy required for
Nitrification/denitrification
treatment
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Circular Economy principles
• ‘Waste’ is food
• Diversity is strength
• Energy from renewable sources
• Systems thinking
– "using the resources available in cascading
systems, (...) the waste of one product becomes
the input to create a new cash flow”
– 2012 report for Ellen MacArthur Foundation by McKinsey &
Company, first described business opportunity transition to
a restorative, circular model
en.wikipedia.org/wiki/Circular_economy
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Source Diverted Wastewater (Decentralized) Systems
Reduced
Food
transport cost
Land
Recycle
and reuse
Stormwater
filtration
Reduced
C, P, N, K
global Bathing
recovery
warming quality
Black Grey
water Water
CH
4
Greywater
CO
2 treatment &
reuse
Bioenergy Lower P, N
recovery Higher water
8 quality
Water system issues: access & population
growth, climate change, & eco-service loss
• Need adaptive approaches to
aid decision-making in circular
economy:
– Treating water so fit-for-purpose
~ 20% needed at drinking water
quality
– With full cost accounting for water
services driven by resource
recovery (thermal, electricity,
N&P, water…) for the built
environment system life-time
Blackwater
Indoor per capita gal/d (%) water use*
*DeOreo et al. (2016) REU study, AWWA
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Alternative urban water elements for
the circular economy
Greywater/treatment (70% of
20%
Surface/Grou Water household use)
Water supply
ndwater treatment
Household Fertilizer
>10% Energy/heat
Blackwater recovery
Rain Water
Electricity
Hot water
Different financial model & political will for:
• Say 40% reduction in home energy & water vs 2010 home
 Financially-driven water, energy & nutrient resource recovery
• Climate- & demographic-adaptive infrastructure
 Decentralized, adaptable so antifragile*
*Nassim (2012) Antifragile: Things That Gain
from Disorder, Random House
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