The document discusses MEXEL, a sustainable solution for fouling, scale, and corrosion in hydraulic systems. It describes MEXEL as a non-oxidizing emulsion made from alkyl amines that is injected intermittently in small doses to form a protective film on surfaces. MEXEL provides five benefits: fouling control, scaling control, corrosion control, a mussel repelling effect, and fluidization of mud. It complies with environmental regulations and is non-toxic. MEXEL is presented as a technically and financially superior alternative to chlorination for cooling water systems.

1. 1
A room is not painted by filling the room with paint
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

2. 2
MEXEL process is based on simple idea that it is:
 more efficient,
 less expensive,
 has less impact on environment,
to treat at surface level,
instead to sterilize the whole mass of water
MEXEL Process is a "Green" process which offers
an alternative to usual techniques using oxidants
(Cl2 or Br) + ferrous sulfate + anti-scaling agents
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

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MEXEL 432/0:
None oxidant stable emulsion, made from alkyl amines
Application principle:
1/2 hour intermittent daily injection (optimized in operation), of
a micro dose (5 mg/l) of a tensioactive emulsion, having
dispersant properties
How MEXEL 432/0 works:
MEXEL 432/0 migrates to internal surfaces within the hydraulic
system & Intake Structure forming a protective film at the
molecular level, which provides treatment and protection of the
system;
Cumulates five (5) effects:
1. Fouling control,
2. Scaling control,
3. Corrosion control,
4. Mussels “repealing” effect,
5. Fluidization and dispersion of mud
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

4. 4
MEXEL 432/0 complies with regulations
governing environmental sustainability
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.
1. No chlorine discharge at cooling water circuit discharge,
2. No impact on environment, (impact studies),
3. Non toxic versus mammals, as demonstrated by numerous
specific laboratory tests performed on specific organisms:
mammals, Bacteria, algae, Crustacean, Mollusk, Fishes…
4. Biodegradable product,
5. Does not contain heavy metal nor organ halogen substances,
6. Substances used don't present any recognized carcinogenic
effect,
7. No mutagen or clastogen,
8. No endocrine perturbation, as proven by tests,
9. No action on human DNA.

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List of major registrations and homologations:
MEXEL 432 is conform to New EC 98/8 Directive (biocides)
OSPAR (HONCF): North Sea and North Atlantic Ocean,
U.S. Environmental Protection Agency (EPA); Reg No: 69100-1
EC (IPPC): BAT’s (Best Available Technique)
Netherlands: Staatstoezicht op de Mijnen – Reg: 94074874,
Hong Kong Govt Environmental Protection Dept - Reg: (41) in EP 70/A4/1,
Tunisia – C S E. Reg: 17/03/2003
Australia, Chile
France - EDF: process qualification at issue of a 10 years trial test, based
on sanitary, technical an economical criteria
In progress: Japan, India, Algeria, Morocco, Philippines, Malaysia…
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

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Description CHLORINE MEXEL
Action
Biocide: sterilisation of water flow Treatment of Cooling
Water surfaces
Objective
To kill micro and macro organisms Control proliferation of
micro and macro
organisms
Toxicity Very toxic on mammals Non toxic on mammals
Impact on
environment
Non conform to sustainable
development
No impact - Based on EDF
Le Havre data)
Colateral
aspects
1. Hazardous efficiency (hot
water),
2. Develop micro & macro
organism resistance,
3. Corrosion effect,
4. Safety
No risk
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

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MEXEL eco-toxicological benefits
DESCRIPTION CHLORINE MEXEL
Stability Not stable 24 months
Contaminants and by products Tri halomethane
bromamines,
chloramines, …
(subject to Cl2 source)
Biodegradable
Thermal sensibility Yes No
Chemical composition Oxidant None oxidant
Carcinogenity:
- IARC (International Agency for Research on Cancer)
- NTPC (National TocicologyProgram Carninogen)
- OSHA (Occupational Safety and Health Administration)
Products of
degradation most
probably
carcinogenic
none
Mutagen (according to Ames test) Yes (oxidant) none
Oestrogeno-mimetic ? none
Chromosome aberrations on human ? none
CAPEX HIGH VERY LOW
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

8. 8MEXEL 432/0 - 5 mg/l - ½ hour per day
3 mg/l
~ 1 mg/l (traces)
1 h per day
Including 80%
water
CRF
Condenser Unit 1
Water intake
Discharge point
2 mg/l –
½ hour per day
Immediate adsorption in substances in suspension
Integration in biological surface membrane
Adsorption on circuit surfaces
Adsorption in mud and scale
Biodegradationoffree&adorbedMEXEL432/0
3,5 mg/l
MEXEL process typical action
Condenser Unit 2

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Q
Q/1000
MEXEL
432/0
Static
mixer
Dosing pump
Circulating pump
Condenser
Discharge
Aux CW pumps
Diffuser
Auxiliary
exchangers
Q/1000
p > 3 bar

10. 10
Waterintakeopening
Water intake opening
Dia 10 mm
1 meter
Lifting
1 meter
1 meter

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Very Large
circuit
Dosing and storage
Package, delivered in
20’ ISO Container

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1. The water cooling circuit is source of unavailability, performance
degradation and huge maintenance costs.
2. MEXEL process, which is conform to spirit of sustaining
development, has no impact on environment and offers an
alternative to usual techniques, which is technically and
financially superior.
3. MEXEL process is limited to 1/2 hour intermittent daily injection
(to be optimized in service), of a micro dose of a biodegradable
emulsion, in the range of 3 mg/l MEXEL 432 residual
concentration measured at exchangers inlet MEXEL
4. Process offers 5 benefic effects:
1. Controls micro and macro-organisms at circuit surface,
2. Mussels “repealing” effect,
3. Reduces corrosion impact,
4. Reduces scaling impact,
5. Provides mud fluidization and mud dispersion,
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

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DK6/GDF Power Station
Canal outlet
Treated with MEXEL process from 2004
Alive mussels

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Centrale électrique du HavreCentrale électrique du Havre
Tranche 1 – Charbon - 9 m3/s -Tranche 1 – Charbon - 9 m3/s - 250 MW250 MW
1997 1998

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Le Havre EDF Power StationLe Havre EDF Power Station
(250 + 2 x 600 MW - Coal)(250 + 2 x 600 MW - Coal)
FlowFlow 22 m22 m33
/s – Sea water open circuit/s – Sea water open circuit
Treated with MEXEL process from 1996Treated with MEXEL process from 1996

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1. Thermal Conventional Plants:
1. France:
 EDF - Le Havre – 2 x 600 + 1 x 250 MW coal fired – sea water (>12 years)
 3 years renewable LT Agreement applicable to EDF Thermal and Nuclear fleet,
 GDF: DK6 – 2 x 400 MW CCPP – sea water (> 4 years)
2. Tunisia: Radès (STEAG): 4 x 170 MW – HFO – seawater open circuit;
3. Malta: Enemalta – Delimara PS (120 MW); Marsa PS (235 MW – HFO), sea water,
4. Greece – Aluminium de Grèce (CCPP)
2. Nuclear Plants: Le Bugey - 2 x 910 MW nuclear – cooling towers
3. Diesel Plants
1. Guadeloupe: Jarry Nord (Total 445 MW) diesel PS – open sea water circuit
2. Spain: Melilla and Ceuta (Total 360 MW) diesel PS – open sea water circuit
4. Geothermal Plants: West Indies: Bouillante – CFG, Socomine – open sea water circuit
5. Hydro Plants:
1. French Guyana: Petit Saut (100 MW) hydro,
2. Spain: Castellana de Energia Renovables
6. Ships
1. Ships manufacturer: ALSTOM
2. Cargos: CGM, SNCM, Gasocean, CMN, Les Abeilles, Delom, Genavir, Blue Star,
3. France: Nuclear Aircraft Carrier Charles de Gaulle and other French Navy fleet.
4. U.K: 3 nuclear submarines,
5. Spain marine: Patrouillère Centinelle
7. Petroleum industry: Naphta-chimie petrochemical plant, Shell, Socimine, Elf Petroland,
Maersk Oil & Gaz, Samir,
8. Water networks: Hong Kong: Urban sea water grid serving commercial and residential
Buildings, hospitals, and fire fighting hydrant networks.
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.

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List of data required for detailed engineering:
1. Nominal Cooling Water flow to treat,
2. Plant regime of operation,
3. Tide and Typical Cooling water quality analysis + mud content +
risk of jelly fish, algaes and hydrocarbure pollution,
4. CW circuit P&ID, including secondary lines,
5. Detailed drawing of Water intake,
6. Details of CW ducts (type, diameter, length, material…)
7. Condenser and exchangers description: tubes material,
diameters, thickness, Nber of plugged tubes,
8. Main components description (trash rack, filter, CW pumps,
valves, debris-filter, continuous cleaning system…), materials,
9. Space for installation of MEXEL dosing package,
10. Corrective curve: Back up pressure vs sea water temperature and
% output
11. Condenser operating parameters (Back up pressure deviation)
MexelMexel®®
The all-purpose and sustainable solution to fouling, scale and corrosion in hydraulic systems.