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Bound chloring reduction using UV-C

Bound chloring reduction using UV-C

The UV-C energy disinfects the swimming pool water, removes chlorine resistant micro organisms (e.g. Cryptosporidium & Giardia) and importantly, reduces the level of bound chlorine in the water.

The Rotterdam municipality started the Rotterdam Climate Initiative (RCI) in 2006, with the ambition to become a ‘Low Carbon’ city. To improve the city’s energy performance, an initiative called ‘Rotterdams Green Buildings’ (RGG) was established. The energy management and maintenance of the city’s properties is outsourced to an Energy Service Company (ESCo), and is defined by a performance contract. The first RGG project started in 2011 and included the renovation of nine municipal swimming pools.

Targets

The city of Rotterdam has three sustainability objectives:
– Reduce energy consumption and hence CO2 emissions
– Optimising maintenance
– Improvement of the indoor climate
During renovation of the nine swimming pools, the forthcoming Dutch water legislation regarding a lower legal limit for bound chlorine was also a point of focus.

Solution

After an extensive tendering process, the ESCo selected UV-C systems from Van Remmen UV Techniek. The sustainable, efficient design of their UV systems and their technical experience with UV-C were deciding factors.

The Rotterdam pools are equipped with ‘full flow’ installed UV-C units, which can treat capacities from 170 to 310 m3/h.

The UV-C energy disinfects the swimming pool water, removes chlorine resistant micro organisms (e.g. Cryptosporidium & Giardia) and importantly, reduces 
the level of bound chlorine in the water.

Project results

The bound chlorine content significantly decreased
in all of the swimming pools being treated with UV-C.
In the most recent project, a public pool in Overschie, the bound chlorine content decreased from 0.7 to 0.18 mg/l.

By reducing bound chlorine, less disinfection by-products (DBP’s) are created. As a result, less ventilation and heating are required. In the first year of operation this led to a 40% saving in gas consumption.

By using UV-C the chlorine usage also decreased significantly. This resulted in a reduction of 25% in chemical deliveries. Finally, each swimming pool uses 33% less make-up water, significantly saving on water service charges too.

Results:

  • Improved water quality
  • Improved air quality
  • Healthier indoor climate
  • Reduction in bound chlorine content
  • Reduction in chlorine consumption by 25%
  • Each pool uses 33% less make-up water

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