DWP Botlek - Evides

DWP Botlek
Demineralised water for the port-industrial
complex of Rotterdam

Introduction
Evides Industriewater has been supplying high quality demineralised
water from DWP Botlek to a large number of chemical and
petrochemical companies in the Botlek-Europoort area since
1 January 2010 and this has secured the supply of demineralised
water to the port-industrial complex of Rotterdam for the coming
years. With a capacity of 1,400 m 3 per hour, DWP Botlek is the biggest
customised plant that Evides Industriewater has realised up
to now. After extensive consultation with the industry, and working
in close cooperation with Port of Rotterdam, Evides realised this
multi-client, demineralised water plant on the Huntsman Holland
BV site. Evides has a double ring pipe system available which supplies
the water to the Botlek-Europoort area.
Evides Industriewater has supplied distilled water to the industry in
the port-industrial complex of Rotterdam area since the seventies.
This distilled water has now been replaced with high quality
demineralised water which is produced using the most up to date
technology.
The production of gases, energy and water with multi-client plants
and supplying them as commodities to a large number of customers
is a common strategy in industrial areas. Having a shared
infrastructure and a strongly cross-linked base of raw material
suppliers - based on the concept of co-siting where industries are
closely linked to each other through the production and intake of
each others products and commodities - ensures that costs are
lowered, the production area required is reduced and that operational
stability is increased.
Technology and Sources
DWP Botlek uses surface water from the Brielse Meer as a source
and drinking water from the Berenplaat (Spijkenisse) production
location as a back-up. The plant was designed to take in and process
both types of water. DWP Botlek’s process design takes into
account the consequences of incidental salination of the Brielse
Meer due to climate change and possible structural salination resulting
from government measures (Kierbesluit Haringvliet: Decision
to leave the Haringvliet sluices ajar).
DWP Botlek consists of a combination of ion exchange and membrane
technology. The use of membrane technology as the main
desalination stage makes the system less subject to the salt concentration
in the supply water than with ion exchange technology.
Process stages
Pre-purification: DAFF (a combination of coagulation, dissolved
air flotation and sand filtration) is used to remove seasonal algae
bloom before the water goes through the main process.
Demineralisation: The pre-treated water first passes through a
softening stage where the water hardness is lowered in order to
reduce scale build-up on the membranes. The main desalination
stage is then carried out in the reverse osmosis (RO) plant.
The raw demineralised water is then further purified in the mixing
bed ion exchange stage (IX) to the required quality of the demineralised
water.

Lake
Process diagram
of DWP Botlek
Supply reliability
Feed water
DWP Botlek’s customers are mainly companies in the chemical and
petrochemical industries. Their production processes rely on steam,
and consequently demineralised water, to an important extent and
this makes having a guaranteed supply of demineralised water
essential.
With DWP Botlek Evides can guarantee a high level of reliability of
supply:
• The plant has two independent water sources that meet the
required levels of availability. This means that the supply of
feed water is secured at all times;
• The plant’s design is based on redundantly implemented
processing units. Combined with more than 15 years’ practical
experience in the operational management of top quality, water
treatment plants, this redundancy results in an operation that
guarantees continuity;
• The plant has a substantial storage capacity of demineralised
water in order to secure its contractual supply obligations for a
substantial time in the event of electrical or mechanical failures;
• DWP Botlek’s distribution pipeline to its customers – which is
called the ‘demi-net Rijnmond’ – was double executed. This
means that Evides can continue to supply demineralised water
during maintenance or if there is a failure.
The design of the DWP Botlek has been based on the proven
efficiency and reliability of numerous other plants of Evides
Industriewater. Over the last fifteen years Evides Industriewater
has grown to become the partner that provides customised water
solutions to the chemical and petrochemical industries. In all the
big industrial areas in the Benelux such as Rotterdam, Terneuzen,
Vlissingen, Antwerp and Eemshaven, Evides provides technologists
and operators for the operational management of water treatment
plants. This is how Evides produces process water, purifies
wastewater and processes effluent to make it possible to reuse
it as industry water. The operational excellence of its operational
management enables Evides to be an exclusive, reliable partner in
providing customised water solutions. Its customers can 100% rely
on dedicated, 24/7 provision of services from Evides.
DAFF
Flotation
Anthracite
Sand
Vertical RO Reverse
Osmosis (RO)
Brine
Back-up system
Softener
(NaCl)
Mixed bed
polisher
Softened
Water Reservoir
Demi
Water Reservoir
Construction in record time
The construction was completed in an exceptionally short period
of time: the start of the piling was at the beginning of 2009 and
the plant delivered its first demineralised water in early December
of the same year. In addition to good cooperation with the
municipal services and Port of Rotterdam, the plant was designed
and constructed in a design-construct contract using three strategic
partner-contractors. Evides worked together with Dura Vermeer on
all the civil works, a construction team was formed with Visser &
Smit Hanab and BAM for the infrastructural works such as pipelines
and Evides cooperated with Logisticon Water Treatment on
the construction of the processing plants.
This approach to the project made it possible for Evides to be able
to guarantee a stable and reliable supply of high quality demineralised
water to its customers before the planned contract date of
1 January 2010.
The first phase of the construction of the DWP involved the erection
of the demineralisation plant. The second phase, the construction
of the pre-treatment plant, was started in June 2010. The
pre-treatment plant came into operation after the summer of 2011,
thus enabling to switch the water source from drinking water to
the water of the nearby Brielse Meer. Drinking water is still available
as a back-up. The choice of a sustainable source in combination
with the reliability of supply in the design and operational
management guarantees a reliable supply of demineralised water
to the industry in the Port of Rotterdam.
Demin
water
network

Quality and quantity
With its capacity of 1,400 m 3 per hour, DWP Botlek is one of the
biggest demineralised water plants in the Benelux. The customers
use the top quality demineralised water primarily as boiler feed
water. The quality of the water that the plant produces is such that
it is immediately suitable for use as feed water for most steam
boilers (average conductivity < 0,2µmS/cm). The water quality complies
with the values given in Table 1 at least.
However, in some cases it may be that steam boiler suppliers set
even higher requirements for the feed water. In such cases extra
treatment may subsequently be required and Evides Industriewater
can facilitate this relatively easily on site by implementing a post
purification stage in the form of polishing using ion exchange, for
example.
Table 1: Demin water quality at customer
Parameter Maximum value
pH 9,0
Iron 0,05 mg/l
Copper 0,05 mg/l
Hardness 0,04 mmol/l
Electrical conductivity (at 25°C) 4 mS/cm
Silicate SiO2 0,03 mg/l Si
Evides Industriewater BV
Schaardijk 150 • 3063 NH ROTTERDAM • The Netherlands
P.O.Box 4472 • 3006 AL ROTTERDAM • The Netherlands
tel. +31 (0)10 293 51 72 • sales@evides.nl
www.evides.nl
Advantages of a multi-client
demineralised water facility
• The clients of DWP Botlek take in high-quality demineralised
water as a commodity instead of having to produce it
themselves;
• A collective system has intrinsic buffer capacity and portfolio
buffering;
• The clients have the option to peak intakes and variations
in their intake profile at competitive costs since the portfolio
levelling of the total intake profiles allows for peak
mitigation;
• High degree of reliability of supply and reliability through
complete redundancy as well as the application of proven
technologies;
• The operation and maintenance is executed by specialist
staff of Evides Industriewater, that have only one thing
in their minds securing maximum operational excellence
through asset management schemes and using their skills
in water production to their full extent;
• Customers do not need to invest themselves and can
consequently keep investment capacity available for core
business projects;
• Customers do not need to maintain high-level knowledge
in their own organisation but instead can rely on the specialist
knowledge of Evides as their partner-in-water;
• Due to economies of scale the advantage of cost reduction
through shared facilities is passed on to the clients by
means of competitive prices for the demineralised water.
Evides Industriewater B.V.
Evides Industriewater is a subsidiary of Evides N.V., supplier of the
drinking water in Zeeland, the southwest region of Zuid-Holland
and the Brabantse Wal.
As the biggest supplier of water services to industry in the
Benelux, Evides Industriewater is responsible for the production
and supply of industry water, demineralised water and water for
the agricultural sector. In addition to this, Evides Industriewater has
various industrial and domestic wastewater treatment plants available
which it manages.
Evides realises these plants on the basis of DBFO contracts, where
Evides is responsible for all stages of the realisation of the plant
through to maintenance and operational management.