Energy recovery

Report
Wastewater Treatment
Presenter: Marius Caprariu
Introducing IBI Group
December 2012
Traditional Wastewater Treatment
The objective of conventional sewage treatment plant designs has
historically been compliance with environmental regulations for the
lowest capital cost
Municipal WWTP
Unit Operations
• Primary treatment
High rate solids separation processes
• Secondary treatment
Efficient aeration, N & P removal
• Tertiary treatment
Effluent quality and space (membranes)
• Nutrient removal
Biological removal of nitrogen & phosphorus
• Disinfection
UV, onsite NaOCl generation
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Traditional Wastewater Treatment

All the municipalities have developed, operated and maintained their wastewater
treatment plants through collection of taxes from its customers.

As the costs for raw materials, labour, energy and chemicals have all increased
dramatically, the wastewater utilities are faced with higher costs that can only
translate in higher taxes for the people.
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Consumer prices increase
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Water rates increase 2001-2012
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Future Wastewater Treatment

The primary revenue source to offset treatment plant capital recovery and
operating expenses will be to recover some or all resources from the wastewater
treatment plant and sell them to interested entities.
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Future Wastewater Treatment
Continuous improvements will enable new objectives in future
treatment plants necessary to conform with societal megatrends
Megatrends
Objectives
Development Areas
Sustainability
From net energy user
to net energy producer
Micro fuel cells
Energy
Climate
change
Less tax
revenue
Resource
scarcity
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Industrial and potable
reuse of effluent
Small carbon footprint
Nutrient recovery
Greenhouse gas
mitigation
Recover inorganics
New revenue streams
Public perception of
“sewage treatment”
Energy management
Treated water reuse
experience
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What do we understand at IBI?
Design Criteria
Today
Tomorrow
Water Use
Once
Many Times
Water Quality
Potable
Fit for Use
Wastewater
Once through
Recycle and Reuse
Storm Water
Fast Disposal
Harvest
System Capacity
Meet Demand
Manage Demand
Infrastructure
Hard-piped, Treatment
Add Natural Methods
System Type
Large, Centralized
Smaller, Decentralized
System Design
Standard
New Technologies
Infrastructure Integration
Separate Water, Wastewater
One Water
…design the facilities for the challenges of today and tomorrow.
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Recovery systems at a producer level
Three Types
 Black Water
 Grey Water

- Wastewater from toilets
- Untreated wastewater that has not come into contact with
sewage (showers, laundry, dishwashers, bathing)
Yellow Water - Undiluted urine
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Recovery systems at a treatment level
Energy recovery
Self Powered Sewage Treatment – i.e. ESSDE
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The DEMON® PROCESS
Wastewater Treatment
Origin
Wastewater Treatment
Nitration – Nitritation –
Deammonificiation
Wastewater Treatment
Nitratation – Nitritation –
Deammonification
Wastewater Treatment
Wastewater Treatment
ARA Strass / Austria / 300 kg N/d
Wastewater Treatment
Start-Up
Wastewater Treatment
World Energy Globe Award
+++++++the DEMON®-system is nominated
for the World Energy Globe award+++++++
Awards presentation on 26 May 2008 in the
Plenary Hall in Brussels. Awards for the
best environmental projects are presented
by Kofi Anan and the President of the EU
Parliament Pöttering
Wastewater Treatment
Heidelberg
Wastewater Treatment
Heidelberg / Seed Sludge
Wastewater Treatment
Thun
Wastewater Treatment
Thun
Wastewater Treatment
Glarnerland, Switzerland, 220 kg N/d
Single-Sludge SBR
Wastewater Treatment
Glarnerland, Switzerland, 220 kg N/d
Single-Sludge SBR
Wastewater Treatment
Single Sludge System
Wastewater Treatment
DEMON - Cyclone
Wastewater Treatment
Single Sludge System
Wastewater Treatment
Planctomycetes
Wastewater Treatment
Saving of Consumables
Wastewater Treatment
Award DEMON® Heidelberg
Wastewater Treatment
EssDe®
Wastewater Treatment
Energy balance
140000
Energy consumption WWTP Glarnerland - both trains
aeration system, mixers, secondary clarifiers
normal operation
120000
100000
80000
60000
start
DEMON®
termination
DEMON® main
stream
40000
problems secondary clarifier
20000
0
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Wastewater Treatment
Ontario and Canada
Wastewater Treatment
Recovery systems at a treatment level
Energy recovery
Advantages:
•Maximum energy surplus, thanks to minimal oxygen consumption and maximized
biogas production
•The process generates electricity – wastewater treatment becomes a power generator
•Pollutants in the wastewater will no longer be seen as a problem but as an energy
source
•Case studies – Montego Bay, Jamaica – can produce approximately 6 MW for
approximately 200,000 people
•Comparable costs with a traditional activated sludge plant
•Instead of consuming more than 2 million in energy, the plant will produce more
than $900,000 annually, which in 10 years means more than $30,000,000 form
NWC
Self Powered Sewage Treatment – i.e. ESSDE
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Recovery systems at a treatment level
Energy recovery
Energy Efficient Treatment – i.e. STM
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Recovery systems at a treatment level
Energy recovery
Advantages:
•No blowers, aeration piping, or diffusers means very little
energy consumption
•No odors, no noise, & small footprint are additional benefits
•In terms of energy requirements & range of treatment
capability, the STM ranks highly compared with all other
secondary treatment technologies
Energy Efficient Treatment – i.e. STM
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Recovery systems at a treatment level
Energy recovery
Energy Efficient Treatment – i.e. Diffusaire
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Recovery systems at a treatment level
Energy recovery
Advantages:
•Reduces traditional aeration costs by over 50%
•Easy installation: There is no need to empty the reactor basin
or stop the treatment process for both installation and ongoing
maintenance
•Modularity: Each unit can be serviced independently without
affecting the operations of the rest of the system
Energy Efficient Treatment – i.e. Diffusaire
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Recovery systems at a treatment level
Energy recovery
Energy Efficient Treatment – i.e. SABRE
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Recovery systems at a treatment level
Energy recovery
Advantages:
•95% less aeration energy, 85% less total energy
•30%-50% reduction in the amount of excess sludge compared to conventional
processes
•Modular design, odorless with a reduced footprint
•Case study, 580 units housing development, Pointe Hanover, Jamaica:
conventional activated sludge plant consumes 8.5 kW/h for the aeration and
SABRE consumes only 1 kW/h
•Capital cost is marginally higher, however the life cycle cost is lower than a
traditional activated sludge plant
Energy Efficient Treatment – i.e. SABRE
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Lessons to take home
•Embrace new technologies as they will add revenue streams to your utility.
•Your operations and maintenance costs will be reduced
•When you implement a new facility or upgrade an existing one, evaluate the
technologies based on the life cycle costs and not capital costs
•Start with a small plant and test the technology and train the operators
•Always ask the consultants or contractors for reduced energy consumption
technologies, otherwise you will be stuck with high energy bill every year
•We are here to help, so just ….. Call or e-mail
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Need more information?
[email protected]
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Need more information?
Thank you for your time and attention
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