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Water-chain management at Dow Benelux Terneuzen : Spuikom water re-use as cooling tower supply

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Water-chain management at Dow Benelux Terneuzen : Spuikom water re-use as cooling tower supply

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Samenvatting

Dow has set it self goals in order to achieve more water sustainability. To do so an integrated water management "Master Plan" is derived. By 2015 a 35% reduction in fresh water intake (in comparison with 2007) needs tot be achieved by enhancing re-use and recycle of water. The ultimate (2025+) objective is that Dow and its immediate surrounding become fully self-supporting with respect to its water needs.
To obtain the 2015 goals water of different sources need to be used at Dow. The re-use of rainwater is most promising following the chain as stated below:

rainwater→ Spuikom→ DECO → CTS → CT → air & Westerschelde

In order to prevent the dilution at the wastewater treatment plant a "selective terrain separated sewer" is realized. This means that every quadrant on the site is analyzed on the criteria: "is dewatering towards the Spuikom reliable."
In relation to the separation of the quadrants three zones are distinguished. Namely a green
zone, an orange, and a red zone. The green zone and parts of the orange zone dewater towards
the Spuikom.

The goal within this final internship is to find out possibilities to re-use collected rainwater and stored in the present Spuikom basin as "cooling tower suppletion water"(CTS).
To obtain the goal the current water qualities and specifications of the water chain need to be researched.

The main question in this study is stated as follows;

• How can the Spuikom water quality be made suitable in order to serve as CTS?

To answer the main question the following secondary questions are formulated;

• What is the current water quality?
• What is the desired water specification?
• Do the current and the desired water specifications match?
• Which Improvements are thinkable in order to meet the desired water specifications?
• What are the costs and benefits of the several improvements?

Instead of looking at the Spuikom as a single entity, the entire water chain is investigated from
the rain that's directed to the Spuikom till the water being discharged by the cooling tower (CT).
The chain is analyzed for the data available, this data is compared with the corresponding water specifications.

The data analyses tell:
• that the Spuikom is shows seasonal differences,
• That the water quality of the Spuikom is not in spec with the DECO plant from Evides, but almost in spec with the current cooling tower suppletion water.
• That it's not likely that the Spuikom water will threaten permit levels of the cooling tower. But
the salinity of the Spuikom does threaten the operational specification of the cooling tower.
• For the water sent to the Spuikom, no real relation could be found between the water level of the ditches and the related salinity.
• that the best rainwater quality is often discharged to the Westerschelde instead of to the Spuikom.
• that the pump regime should be revised.

A follow-up study is needed to research actual improvements, benefits and costs.

Toon meer
OrganisatieHZ University of Applied Sciences
OpleidingWatermanagement/ Aquatische Ecotechnologie
InstituutDelta Academy
PartnersDow Benelux b.v.
Gepubliceerd in
Datum2008-07-01
TypeBachelorscriptie
TaalEngels

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