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Air Liquide/Pergen (Rotterdam)Demineralised water for the biggest refineryof Europe at Shell Netherlands Refinery

History50-V1200 At the site of Shell Netherlands Refinery, <strong>Evides</strong> has constructeda process water plant which produces demineralised(demiwater) for supply to the Cogen (Cogeneration)plant of Pergen. This Cogen produces steam for delivery toShell (700 tonnes per hour) and generates electricity whichis primarily supplied to Eneco (300 MW). Shell uses thissteam in various production processes and to heat somebuildings and certain storage tanks. The Pergen Cogenreplaced Shell’s 46 year-old Boilerhouse 4, which was stillbeing fired with heavy oil residue. The gas-fired PergenCogen makes a considerable contribution to the sustainabilityof the largest refinery site in Europe: emissions ofsulphur dioxide (-99%), nitrogen oxides (-66%) and fineparticles (-90%) are reduced considerably. The chemical and petrochemical industry consumes largequantities of utilities, including electricity and steam.The most important feedstock in the production of steam isdemiwater. For high-yield Cogens like Pergen, supply qualityis equally as important as reliability of supply: conductivity(< 0,2 mS/cm) and TOC content (Total Organic Carbon; < 200ppb) are essential.BL IX Pergen – a division of the world’s largest producer ofindustrial gases, Air Liquide – is responsible for the design,construction and operation of Shell’s latest Cogen. Thedemi-production plant (investment approximately 20 millioneuros) is part of the Cogen. Pergen wanted to tender theproduction and purchase of demiwater and sought a partnerwho was prepared to make the investment needed as wellas to operate the demi-production plant. <strong>Evides</strong> Industriewaterwas selected to fulfil this role. A few factors helpedto determine this choice: firstly, <strong>Evides</strong> Industriewater boastsa sizeable water sources portfolio in the Rotterdam harbourarea which makes it possible to realise the supply of variouswater qualities , while at the same time offering sufficientback-up capacity. Secondly, <strong>Evides</strong> Industriewater has vastproven track record in the realisation of such products inthe petrochemicals industry. According to the DBFO model,<strong>Evides</strong> is fully responsible for the project: from design toconstruction, and from financing to day-to-day operation. Inthe Rotterdam harbour area, <strong>Evides</strong> Industriewater employsthe personnel qualified to operate such installations. Thirdly,<strong>Evides</strong> Industriewater offers proven experience in using ionexchangetechnology for the production of demiwater thatmeets the required quality demand. Finally, <strong>Evides</strong> Industriewaterwas prepared to pre-finance the investment for sucha project (contract duration: 15 years).

The demi-plantAll this results in well-managed feed water quality, reliabilityin design and operation and – finally – a guaranteed supplyof demiwater around the clock.In 2004, a start was made to the activities of <strong>Evides</strong> Industriewater,by undersigning a letter of intent, after whichwork could begin on the design. <strong>Evides</strong> developed the installationbased on a DBFO contract. This means that <strong>Evides</strong>Industriewater has resumed full responsibility for the design,construction and financing of the project. After construction(February 2006 to end of 2007) the demi-plant was startedupand commissioned at the beginning of 2008.With a total capacity of 1,055 m 3 demiwater per hour, theplant is one of the largest of its kind in Europe. The plant isfed by so-called industry water which is supplied by <strong>Evides</strong>Industriewater. The Shell site at Pernis already is connectedto the transport network of industry water. This water has agood, constant base quality (equivalent to drinking water).In addition, the redundancy of the piping transportationnetwork adds to the reliability of supply. Because the wateris of good and consistent quality, the size and number oftreatment steps of the new demi-plant are relatively limited.This was beneficial for the proposed location because theplant needed to fit into a very compact building due tospace limitations.The demiwater process is based on ion-exchange (IX)because this demineralisation process results in a relativelyhigh recovery, whereby savings are made as a result ofthe reduced use of feed water and reduction of quantitiesof waste water. Further, <strong>Evides</strong> Industriewater has a lot ofexperience in operating such installations very efficiently(including the Dow Chemical plants in Terneuzen and Stade/Hamburg).The industry feed water flows through two pipes into two10,000 m 3 break tanks. It is then pumped from these tanksto the demi-plant, which consists of five IX lines. Each IXline consists of a cation filter with weak and strong acidresin, a CO 2degassing tower, an anion filter with weak andstrong base resin, followed by a mix-bed filter serving as afinal polisher.The plant has a high operating reliability: the contractuallyrequired daily supply capacity of demiwater can on averagebe supplied using four of the five IX lines. The fifth line thusmerely acts as back-up, whereby the required redundancyis offered needed for correct operation. Further, the plant

50-V1100 has three complete regeneration stations, each of whichcan simultaneously regenerate a cation and an anion filter.Despite the fact that the required chemicals are suppliedto the installation via piping, the plant has its own chemicalstorage in order to allow autonomous operation for fourdays in case piped supply is interrupted. The plant operates fully automatically without needing thecontinuous supervision of operators. An automated managementsystem determines, on the basis of the feed water’sconductivity and the throughput of the filters, the timing ofthe regeneration of the ion-exchange filters. This systemalso calculates the remaining run-time of the filters anddetermines which production lines must operate and when.Operators of <strong>Evides</strong> Industriewater remotely oversee theprocess and can, if necessary, take corrective action. All signalsfrom the plant are also sent to the Pergen control roomin order to enable the Cogen operators to have an insightinto the process status and act in case of emergency.SpecificationsKation filters Number of units: 5Max. number of units in operation: 4Diameter:3.500 mmCapacity (instantaneous): 360 m 3 /hRun time:10 hAnion filtersNumber of units: 5Max. number of units in operation: 4Diameter:3.600 mmCapacity (instantaneous): 360 m 3 /hRun time:10 hMix-bed filtersIf necessary, the demi-plant can be expanded in the futurewith a sixth IX line.Number of units: 5Max. number of units in operation: 4Diameter:3.100 mmCapacity (instantaneous): 360 m 3 /hRun time:480 hDemiwaterParameterConductivity:Silica:Total ferrous (Fe):Total cupper (Cu):Sodium (Na):DOC:Value< 0,2 μS/cm< 0,02 mg/l< 0,02 mg/l< 0,003 mg/l< 0,01 mg/l< 900 μg/l

50-V1100 ResultUsing a custom-designed and operated demi-plant, <strong>Evides</strong>Industriewater produces demineralised water for supplyto Pergen. This secures an exceptionally reliable supply ofdemiwater to Pergen, which fully complies with safety, reliabilityand operating standards common to the petrochemicalindustry. Due to the high quality feed water, the reducedproduction of waste water contributes to the environmentalbenefits which accompany the Cogen’s high yield characteristics.This is important to both Pergen as well as theconsumer of steam, the Shell refinery.

<strong>Evides</strong> Industriewater:using the water chain for the industry10/08/300<strong>Evides</strong> Industriewater is a subsidiary of <strong>Evides</strong> NV which,as a supplier of drinking water in the provinces of Zeelandand Zuid-Holland in of the south-west of The Netherlands,is the second largest drinking water company inThe Netherlands.<strong>Evides</strong> Industriewater is the biggest supplier of waterservices to the industry in The Netherlands. <strong>Evides</strong>Industriewater is responsible for the production and supplyof process water, demineralised and distilled water to theindustry as well as irrigation water to the agro-business.Total production amounts to approximately 80 million m 3per year. In addition, <strong>Evides</strong> possesses and managesvarious industrial and domestic waste water treatmentplants.In the district of The Hague, <strong>Evides</strong> Industriewater is partnerin a joint venture that is responsible for the erection andoperation (DBFO = design, build, finance, operate) of theHarnaschpolder sewerage water treatment plant representing1.3 million population equivalents, and the renovation ofthe Houtrust sewerage water treatment plant. <strong>Evides</strong>Industriewater develops and constructs a waste watertreatment plant in Delfzijl for the chemical industry in thatarea. <strong>Evides</strong> Industriewater also manages the waste watertreatment plant at the international airport of Amsterdam(Schiphol) as well as the percolation water treatment plantof the landfill site in Vlissingen.All of these plants have been erected by means of DBFO(Design, Build, Finance, Operate) schemes with <strong>Evides</strong>Industriewater being in control throughout all phases.<strong>Evides</strong> Industriewater uses state-of-the-art technologies(membranes, ion exchange) to convert various surfacewater qualities (sea water, brackish water, river water anddrinking water) into process water, demi water andultra-pure water. In full compliance with ourcommitment to reliability at the serviceof process and customer.Source ofKnowledge<strong>Evides</strong> Industriewater BVSchaardijk 150 • 3063 NH ROTTERDAM • P.O.Box 4472 • 3006 AL ROTTERDAM • The Netherlandstel. +31 (0)10 293 51 72 • sales@evides.nlwww.evides.nl