a complete spectrum -...

A complete spectrum of wastewater treatment equipment

PE

E00332E

N 1

606

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

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… 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


We help you find the right fit …

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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


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


Continuous service for high plant efficiency and low lifecycle costs.

© Alfa Laval

PROCESSES AND PRODUCTS

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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

BIOLOGICAL TREATMENT

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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 ®


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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


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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


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


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

© Alfa Laval

THERMAL 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

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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


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Thermal sludge treatment


Benefits Mesophilic

digestion

Thermophilic

digestion

Pasteurisation &

digestion

Sludge

hydrolysis

Sludge quality

Investment cost

HEX

requirements

Operation cost

Ease of

dewatering

Biogas/

Production

/

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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


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

© Alfa Laval

SLUDGE THICKENING

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Sludge thickening

• Decanters:

– ALDEC, ALDEC G2, ALDEC G3

• Gravity belt thickener:

– AquaBelt

• Drum thickeners:

– ALDRUM, ALDRUM G3

– Wedge Wire


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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


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


Benefits Centrifuge G3 centrifuge Gravity belt

thickener Drum thickener

Wash water

Noise

Polymer use

Foot print

Power

Cake dryness


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


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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

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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


Low power, supervision and maintenance requirements with high performance

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Sludge dewatering


Benefits Centrifuge Belt press Chamber press Screw press

Wash water

Noise

Polymer use

Foot print

Power

Cake dryness


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


Thank you

www.alfalaval.com

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