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www.alfalaval.com
You are unique …
Every wastewater-treatment design faces
numerous challenges and needs a unique
solution to meet requirements for:
• CO2 footprint and environmental legislation
• Labour, disposal and polymer costs
• Maintenance needs
• Process conditions and capacity
requirements
• Projected future demands
• And many more . . .
© Alfa Laval Slide 3
Every wastewater treatment plant is unique
www.alfalaval.com
… and so are we
Alfa Laval offers a complete spectrum of equip-
ment and knowhow for water treatment. With
Alfa Laval as your partner you get access to:
• Industry-leading wastewater expertise
based on the experience from thousands of
installations
• One of the widest product ranges for
wastewater treatment, covering a variety of
different technologies
• Assistance in analysing your unique
situation and selecting the optimal
equipment for your needs and budget
© Alfa Laval Slide 4
We help you find the right fit …
www.alfalaval.com
Products and knowledge
Working with Alfa Laval helps you:
• Lower total operating costs thanks to greater
overall plant efficiency
• Reduce polymer consumption, energy use and
disposal costs
• Optimise operations according to your situation
• Get higher capacity with fewer process
disturbances
• Ensure on-time and on-budget project completion
• Upgrade traditional WWTP plants to meet more
restrictive demands on effluent quality and heat
recovery
© Alfa Laval Slide 5
A focused solution
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For the long run
• Global network of service centres, spare part hubs
and field service engineers
• Local support
• Advice to improve operations and supply
equipment upgrades when conditions change
• Training programs
• Custom-made service agreements that allow you
to accurately budget service costs, maximize
uptime, improve cost-efficiency and performance
• Peace of mind
© Alfa Laval Slide 6
Continuous service for high plant efficiency and low lifecycle costs.
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Process overview
© Alfa Laval
Alfa Laval equipment
Diffused aeration
Filtration
Sequencing batch reactor
Thickening
Dewatering
Heat exchangers
Fluid control
www.alfalaval.com © Alfa Laval Slide 9
Diffused aeration
Filtration
Sequencing batch reactor
Thickening Dewatering Heat exchangers
Fluid control
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Processes
• Biological treatment (water line)
• Thermal sludge treatment (sludge line)
• Sludge dewatering
• Sludge thickening
© Alfa Laval Slide 10
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Biological treatment
• Conventional activated sludge
– Diffusers
• Sequencing Batch Reactor (SBR)
– Diffusers, surface layer decanters,
automation equipment, etc.
• Membrane Bio Reactor (MBR)
– Diffusers and MBR modules.
• Tertiary treatment
– ISO-DISC ®
© Alfa Laval Slide 12
www.alfalaval.com
Benefits Aeration +
clarifier
Aeration +
SBR
Aeration +
clarifier +
ISO-DISC
Aeration +
SBR + ISO-
DISC
MBR +
aeration
Effluent
quality
Investment
cost
Control
complexity
Operation
cost
Foot print
Biological treatment
© Alfa Laval Slide 13
www.alfalaval.com
Diffuser technology
• Fine and coarse bubble
• Disc, tube or stainless steel types
• Optional complete solution with pipes and
supports
• Fixed or retrievable systems available
• Durable diffuser designs with integrated air
check valves and higher air flow
Slide 14
Complete systems or just components
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Sequencing Batch Reactors (SBR)
• Allows flexible and efficient treatment of
low and variable wastewater flows
• Small footprint – all treatment steps in
the same tank
• Cost-efficient way to achieve lower
effluent limits
• Our patented surface-layer decanter is
the best on the market
• Complete process design delivered
including supply of diffuser, mixer, WAS
pump, surface layer decanter and
process control system
© Alfa Laval Slide 15
Eliminate the clarifier
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ISO-DISC Cloth Media Filter
• High-purity, reuse-quality filtrate
• Solids capture down to 10 microns, without
filter mat run-in time
• High solids and hydraulic loading with small
footprint-to-flow ratio
• Robust yet simple filter
• Outside-in filtration
• Most flexible design on the market due to
availability of both square and rectangular
discs
© Alfa Laval Slide 16
Tertiary treatment for low effluent limits and water reuse
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Hollow Sheet Membrane for MBR
• Ultralow TMP allows gravity operated process,
without vacuum pumps and less auxiliary
equipment
• Ultralow TMP reduces fouling with lower
maintenance/manpower requirements and
chemical consumption as a result
• Fully stackable design ensures energy efficient
air scouring and high packing density
• Energy efficient air scouring means smaller
blower and lower energy consumption
• Robust design minimizes pretreatment
requirements and maintenance
Future proof waste water treatment
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Thermal sludge treatment
• Mesophilic digestion
– Tube in Tube, sludge-to-water spiral,
sludge-to-sludge spiral, PHE
• Thermophilic digestion
– Tube in Tube, sludge-to-water spiral,
sludge-to-sludge spiral, PHE
• Sludge hydrolysis / pasteurisation
– Tube in Tube, sludge-to-water, sludge-
to-sludge spiral, PHE
• Evaporation – anaerobic effluent
– AlfaVap, WideGap, AlfaVap system
val Slide 19
www.alfalaval.com
Thermal – industrial wastewater treatment
• Evaporation – crystalization of salty
effluents, e.g. petrochemicals, chemicals,
pharmaceuticals
– AlfaVap, WideGap, AlfaVap Systems
• Pasteurization of waste water, e.g.
pharmaceutical waste
– PHE, Tube in Tube, spirals
• Effluent cooling
– PHE, Tube in Tube, spirals
© Alfa Laval Slide 20
www.alfalaval.com
Thermal sludge treatment
© Alfa Laval Slide 21
Benefits Mesophilic
digestion
Thermophilic
digestion
Pasteurisation &
digestion
Sludge
hydrolysis
Sludge quality
Investment cost
HEX
requirements
Operation cost
Ease of
dewatering
Biogas/
Production
/
www.alfalaval.com
Tube in Tube Heat Exchanger
• Designed for sludge with fibres and particles
• Ideal for heating/cooling wastewater sludge
• Single tube mounted inside outer shell tube,
product medium flows counter-current
• Maintenance free, no need for spare parts
• Flexible design
© Alfa Laval Slide 22
Designed specifically for heat transfer in sludge with fibres and particles
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Sludge-to-water spiral heat exchanger
• Low maintenance due to self cleaning design
efficiently handling fibrous and particle loaded
sludge
• Maximum uptime due to easy and full access
• Robust and long life time welded heat
exchanger
• Less installation and service space needed due
to compact design
• Smaller pumps required due to low pressure
drop
• Higher thermal efficiency than Tube in Tube
Slide 23
Sludge-to-water or sludge-to-sludge configurations
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Sludge-to-sludge spiral heat exchanger
• True sludge-to-sludge HE with higher thermal
efficiency than Tube in Tube
• Full counter current flow
• Maximum heat recovery despite variable flow
• Flexible operation
• Low maintenance due to self-cleaning design
efficiently handling fibrous and particle loaded
sludge
• Maximum uptime due to easy and full access
• Less installation and service space needed
thanks to compact design
Slide 24
True sludge-to-sludge gives optimal thermal efficiency
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Heat exchangers
© Alfa Laval
Sludge-to-water Sludge-to-sludge
Benefits Tube in Tube Spiral Spiral Tube in Tube
Investment
cost
(Low capacity)
(High capacity)
(Low capacity)
(High capacity)
Heat recovery
Capacity
Foot print
Ease of
cleaning
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Sludge thickening
• Decanters:
– ALDEC, ALDEC G2, ALDEC G3
• Gravity belt thickener:
– AquaBelt
• Drum thickeners:
– ALDRUM, ALDRUM G3
– Wedge Wire
© Alfa Laval Slide 27
www.alfalaval.com
Decanters
• Perfect for high capacity thickening
duties
• Possible to thicken without polymer
• Wide range from basic to “state of
the art”
• Clean, enclosed, odour-free
operation
• Lower power consumption with G3
• User-friendly and flexible controls,
BCC and 2Touch
© Alfa Laval Slide 28
ALDEC, ALDEC G2, ALDEC G3
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Gravity belt thickener
• Trouble-free operation with low cost and
hassle
• Minimal operator attention and
maintenance
• Long lifetime bearings and rollers
• Reduced energy use
• Patented ramp ensures optimal thickening
performance, even on difficult WAS
• Integrated mixing valve lowers polymer
consumption
Cost-effective thickening of municipal and other flocculating sludge
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Drum thickeners
• Clean, enclosed, odour-free design
• Straightforward, robust design
• Long life time filter cloth
• Flushing at intervals saves water
• Very gentle on flocculated feed
saves polymer and gives high
recovery
• Safe design with slam proof cover
and cover switch availability
Slide 30
ALDRUM, ALDRUM G3
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Sludge thickening
© Alfa Laval Slide 31
Benefits Centrifuge G3 centrifuge Gravity belt
thickener Drum thickener
Wash water
Noise
Polymer use
Foot print
Power
Cake dryness
www.alfalaval.com © Alfa Laval Slide 32
Decanter centrifuge Gravity belt thickner Drum thickner
Cake solids Very good,
can thicken 6 to 15% Good
Good
(can struggle with difficult WAS)
Polymer use Typically 0 to 4 kg per T Typically 2 to 4 kg per T Typically 2 to 5 kg per T
Solids recovery Good if polymer used.
Down to 80% with WAS and no
polymer
Good
Good, but lower use of wash
water typically results in more
solids in filtrate compared to GBT
Unit capacity < 400 m3/h < 150 m3/h on 3 m belt < 180 m3/h on Mega Duo
Civil requirements
Smallest size but has some
structural loading considerations
and may require an acoustic
enclosure
Min. requirements Min. requirements
Operator requirements Minimal complete automation Minimal complete automation Minimal complete automation
Odour control Minimal, enclosed Minimal, enclosed Minimal, enclosed
Power consumption High, 0.8 kwh/m3 Low, 0.25 kW/m3 Very low, 0.15 kW/m3
Maintenance Low except for major service
every 2 years
Very low but belt cloth
replacement every 2 to 3 years
Very low minor service every 2
years.
Water use Very low High, continuous wash water Intermittant wash water
Thickening benchmark
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Sludge dewatering
• Decanters
– ALDEC, ALDEC G2, ALDEC G3
• Belt filter presses
– Euro Press, 3-Belt KlamPress
• Chamber presses
– Manual, side bar, overhead
– Recessed cavity, membrane cavity
• Screw press
– Slow speed polymer, high speed fibre
© Alfa Laval Slide 34
www.alfalaval.com
Decanters
• Wide range from basic to “state of
the art”
• Sizes from 200 to 1000 mm
• Optimized design according to
sludge characteristics
• Focus on low energy consumption
• Higher capacity on same footprint
• User-friendly and flexible controls,
BCC and 2Touch
ALDEC, ALDEC G2, ALDEC G3
www.alfalaval.com
Belt press
• Higher throughput than competitive units
• Higher dry-cake solids and better filtrate
due to unique roller configuration
• Long lifetime heavy duty bearings and
rollers
• Low polymer consumption due to unique
sludge/polymer mixing technology
• No additional flocculation tank or mixer
Slide 36
Dewatering at high volume and solids loading, with low polymer and power use
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3-Belt KlamPress
• Up to 5x capacity on same footprint as
conventional belt press
• Thin feed below 1% dry solids handled at high
hydraulic rates due to independent gravity deck
• Low polymer consumption due to unique
sludge/polymer mixing technology
• Eliminates need for separate thickening unit
• Low maintenance and easy operation with
smart belt alignment and tensioning system
• Long lifetime heavy duty bearings and rollers
Slide 37
Dewatering and thickening in the same unit
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Filter press
• Ideal for very high dry cake solids,
up to 40%
• Solids capture over 99%
• Easily customized for all dewatering
needs
• Operating costs low due to low
polymer and energy consumption
• Greatest process and application
knowledge in the market
Slide 38
Best technology for cake solids to 40% and solids capture over 99%
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Screw Press
• Robust, user-friendly design
• Advanced controls for minimal supervision
• Simple concept – high uptime
• Moderate rotational speed means
– low power demand, reducing operational
costs
– low noise level, improving work
environment
© Alfa Laval Slide 39
Low power, supervision and maintenance requirements with high performance
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Sludge dewatering
© Alfa Laval Slide 40
Benefits Centrifuge Belt press Chamber press Screw press
Wash water
Noise
Polymer use
Foot print
Power
Cake dryness
www.alfalaval.com © Alfa Laval Slide 41
Decanter centrifuge Belt press Screw press Chamber press
Cake solids Very good Good Adequate Best
Polymer use Medium to High Low High Lowest
Solids recovery Good Good Low Very good
Unit capacity Max 250 m3/h Max 30 m3/h Max 25 m3/h Batch production, small
capacity
Civil requirements Smallest size
has some structural loading
considerations
Medium requirements Medium requirements Large room with 2 floors
Operator requirements Minimal complete
automation
Requires ocasional walk
past
Minimal complete
automation
Manual intervention when
discharging
Odour control Minimal, enclosed Optional enclosure,
requires extraction
Optional enclosure takes a
lot of room
Not enclosed, extraction
may be required during
discharge
Power consumption Very high, 0.7 kwh/m3 Low, 0.3 kwh/m3 Very low, 0.2 kW/m3 Medium, appr. 0.1 kwh/m3
Maintenance Very low except for major
service every 2 years
Low but belt cloth
replacement typically
annually
Very low except for major
service every 2 years
Medium cloth replacement
typically annually
Water use Very low High, continuous wash
water Low None
Dewatering benchmark
The equation for
success is universal
Your unique situation
+
Our complete spectrum
=
An optimized solution tailored
to your needs
… not limited to any
particular technology
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