Wastewater Treatment Presenter: Marius Caprariu
Introducing IBI Group
December 2012
Wastewater Treatment
Traditional Wastewater Treatment
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The objective of conventional sewage treatment plant designs has historically been compliance with environmental regulations for the lowest capital cost
High rate solids separation processes
Efficient aeration, N & P removal
Effluent quality and space (membranes)
Biological removal of nitrogen & phosphorus
UV, onsite NaOCl generation
Municipal WWTP Unit Operations• Primary treatment
• Secondary treatment
• Tertiary treatment
• Nutrient removal
• Disinfection
Wastewater Treatment
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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Wastewater Treatment
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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Wastewater Treatment
Future Wastewater Treatment
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Continuous improvements will enable new objectives in future treatment plants necessary to conform with societal megatrends
Megatrends
Sustainability
Energy
Climate change
Less tax revenue
Resource scarcity
Objectives
From net energy user to net energy producer
Industrial and potable reuse of effluent
Small carbon footprint
Recover inorganics
New revenue streams
Public perception of “sewage treatment”
Development Areas
Micro fuel cells
Nutrient recovery
Greenhouse gas mitigation
Energy management
Treated water reuse experience
Wastewater Treatment8
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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.
Wastewater Treatment
Recovery systems at a producer level
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Three Types Black Water - Wastewater from toilets Grey Water - 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
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Self Powered Sewage Treatment – i.e. ESSDE
Energy recovery
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The DEMON® PROCESS
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Origin
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Nitration – Nitritation – Deammonificiation
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Nitratation – Nitritation –Deammonification
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ARA Strass / Austria / 300 kg N/d
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Start-Up
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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
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Heidelberg
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Heidelberg / Seed Sludge
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Thun
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Thun
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Glarnerland, Switzerland, 220 kg N/d Single-Sludge SBR
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Glarnerland, Switzerland, 220 kg N/dSingle-Sludge SBR
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Single Sludge System
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DEMON - Cyclone
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Single Sludge System
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Planctomycetes
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Saving of Consumables
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Award DEMON® Heidelberg
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EssDe®
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Energy balance
Jan 0
9
Feb 09
Mar 09
Apr 09
May 09
Jun 0
9Ju
l 09
Aug 09
Sep 09
Oct 09
Nov 09
Dec 09
Jan 1
0
Feb 10
Mar 10
Apr 10
May 10
Jun 1
0Ju
l 10
Aug 10
Sep 10
Oct 10
Nov 10
Dec 10
Jan 1
1
Feb 11
Mar 11
0
20000
40000
60000
80000
100000
120000
140000
Energy consumption WWTP Glarnerland - both trainsaeration system, mixers, secondary clarifiers
start DEMON®main stream
terminationDEMON® main stream
normal operation
problems secondary clarifier NO 3-N =
3 -
7 m
g/l
NO 3-N =
5 - 10
mg/
l
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Ontario and Canada
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Recovery systems at a treatment level
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Self Powered Sewage Treatment – i.e. ESSDE
Energy recoveryAdvantages:
• 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
Wastewater Treatment
Recovery systems at a treatment level
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Energy Efficient Treatment – i.e. STM
Energy recovery
Wastewater Treatment
Recovery systems at a treatment level
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Energy Efficient Treatment – i.e. STM
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
Wastewater Treatment
Recovery systems at a treatment level
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Energy Efficient Treatment – i.e. Diffusaire
Energy recovery
Wastewater Treatment
Recovery systems at a treatment level
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Energy Efficient Treatment – i.e. Diffusaire
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
Wastewater Treatment
Recovery systems at a treatment level
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Energy Efficient Treatment – i.e. SABRE
Energy recovery
Wastewater Treatment
Recovery systems at a treatment level
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Energy Efficient Treatment – i.e. SABRE
Energy recoveryAdvantages:
• 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
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Lessons to take home
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• 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?
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Thank you for your time and attention