WASTEWATER REUSE IN A COMPACT TREATMENT SOLUTION

Compakblue™

REUSE

REMOVAL OF SUSPENDED SOLIDS AND ASSOCIATED POLLUTANTS BY IMMERSED DISK FILTRATION

P-P

PT-R

U-0

01-E

N-1

107

REUSE

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CONTENTS

Compakblue™

� Water Reuse Challenges

� A Required Water Quality that meets Uses

� Disk Filtration Range

� Compakblue™ Operating Parameters/Conditions

� Compakblue™ Filter

� Operating Principle

� Cloth Filtration Technology (Mecana)

� µ-strainer Filtration Technology (Nordic Water)

� To summarize, the Compakblue™ Advantages

� A cloth Filtration Case Study: Monchy-Saint-Eloi (60), France

� A µ-strainer Case Study: Auxi-le-Château (62), FRANCE

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WATER REUSE CHALLENGES

• To preserve the natural environment• To manage water resources• To relieve the traditional resources• To propose alternative water resources

Countries that are concerned: the United States, Australia, Spain, Middle-East Countries, North Africa…

• No real consensus in the world

• Many countries with the greatest water stress have developed standards or regulations to develop Reuse.

Regulations:

Compakblue™

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Media Filtration

Membrane Filtration …

.

Treated secondary

UWW

Irrigation ofnon public areas

Unrestricted use in urban

areas

Irrigation of green spaces, golf

Non-food Crop

Reverse O

smosis,

Oxidatio

n/Adsorptio

n…

IndirectPotability

Specific Crop

Industries

Food Crop

Process

A REQUIRED WATER QUALITY THAT MEETS USES, APPROPRIATE TREATMENTS

REUSE

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DISKS FILTRATION RANGE

Compakblue™ Compakblue™ is the name for Degrémont’s disk filtration systems used in wastewater re-use applications.

Two versions are available: a µ-strainer filtration version, developed by Nordic Water, and a cloth filtration version, developed by Mecana.

Compakblue™ Product

ModelsNumber of disks/filter

Type of filtration Technology Output Quality(SS as 95%tile)

Mecana 2 to 12Specific fabric

100% submerged

< 6 ppm

Nordic Water4 to 28

µ-strainer60%

submerged< 10 ppm

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Compakblue™OPERATING PARAMETERS/CONDITIONS

Treatment objectiveReduction of SS

and the particle pollution

After the secondary clarifier SS <35ppm

Treated water qualityBetween <3 mg/l SS on the average (<6 in 95%ile)

and <5 mg/l SS on the average (<10 in 95%ile)

Compakblue™

Biological

Treatment

Clarifier Tertiary Filtration

Compakblue™

Compakblue™

in the treatment lineTreatedwater

Waterinlet

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Compakblue™ FILTER

• It complements the media filtration technologies for the reduction of Suspended Solids in tertiary filtration.

• Its uniqueness lies in the standardization of its production and its compact size.

• Water to be filtered passes through the disk filters that that hold impurities.

• The tank, available in both a steel or a concrete version, contains the disks that are arranged on a central tube.

• Disks only run during the washing phase.

Compakblue™

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OPERATING PRINCIPLE

Compakblue™

• Compakblue™ is a constant-rate variable-head gravity filter without level regulation.

•The washing is automatic, it is triggered when the water level is exceeded.

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CLOTH-FILTRATION TECHNOLOGY

The washing of disks is short

and frequent. – It is carried out disk-by-disk with

a suction system for materials retained by the pile fabric.

The filtration is continuous;

no stopping during the cleaning.

Compakblue™ is a mechanical filter developed by the MecanaUmwelttechnik AG Company, in Switzerland; it is the subjectof patents (EP 0958 028).

Cleaning system by suction

Filtration direction

Water to be filtered

Filtered water

Pile fabric seen under the microscope

� OUT / IN FILTRATION

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µ-STRAINER FILTRATION TECHNOLOGY

The washing of disks is short and frequent.– Water to be filtered is fed into the

central cylinder, penetrates between the disks through openings and travels through the filtering medium on the sides of the disks.

– The dirty water is collected in a trough inside the central cylinder.

The filtration is continuous; no stopping during the cleaning.

� IN / OUT FILTRATION

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TO SUMMARIZE, THE ADVANTAGES OF

Compakblue™

An alternative to sand filtration when the

Civ. Eng. cost is high– Saves 4 times the surface area,– Preserves natural landscapes,

Easy to install and operate– Integrating systems in tanks

A safe filtration process– Immersed or semi-immersed disks,– Helminth eggs content < 0,1/L in accordance

with the WHO (World Health Organization) recommendations.

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CLOTH FILTRATION CASE STUDY: MONCHY-ST-ELOI (60), FRANCE

CONTEXT: • WWTP of 30,000 PE• Objective: Discharge in sensitive area • Start-up Date: October 2009

DESIGN:– 2 filters of 6 disks– Total filtering surface area: 60 m²– Disks diameter: 2,10 m– Concrete tank

–Treatment line: activated sludge tank, secondary clarifier, Compakblue™ Filter.

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µ-STRAINER FILTRATION CASE STUDY: AUXI-LE-CHÂTEAU (62), FRANCE

CONTEXT: • WWTP of 4,000 PE• Objective: discharge into sensitive areas (marina and

then a protected estuary)• Start-up date: beginning of 2011

DESIGN:– 1 filter of 3 disks– Total filtering surface area: 8,4 m²– Flow: 60m3/h– Disks diameter: 1,90 m– Steel Tank

– Treatment line: activated sludge tank, secondary clarifier, Compakblue™ Filter

Disk filters

Water inlet

Treated water