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BOLLFILTER filtration solutions in desalination process


With its filtration solutions in the desalination process, BOLLFILTER takes over the pre-treatment filtration to remove most of the large and small particles.

In the process of turning undrinkable seawater into fresh water by removing salt and other minerals, the first step in the desalination process is the pre-filtration of the seawater.

Pre-filtration in desalination plants

The pre-filtration of the seawater in desalination plants represents a complicated step as the soilage loads in water changes fast. As pre-filters for ultra filtration and reverse osmosis, our self-cleaning filtration solutions reliably remove impurities from the seawater and enable efficient continuous operation of the membrane systems downstream in the process.

The guaranteed filtration quality from 10 µm to 5mm ensures at all times sustainable overall performance of the desalination process.

Compared to conventional filtration solutions for the protection of desalination plants, automatic filters from BOLL & KIRCH offer optimised space requirements and minimal operating costs.

See how the automatic filter aquaBoll® works.

Pre-filtration in desalination plants

Pre-filtration for desalination onboard cruise vessels

BOLLFILTERs are also in used onboard large cruise vessels, where a high fresh water consumption involves seawater desalination. The constant production on board ensures autonomy and convenience.

In a large cruise vessel, with for example over 5,000 people on board including passengers and crew, 5 restaurants, 20 bars etc. the fresh water consumption is around 1,500,000 liters per day and seawater desalination clearly becomes a necessity. Fresh water can, of course, be tanked in port, but depending on ship size and travelling time, it also must be constantly produced on board to ensure independence and accessibility.

As water makers can only be used with cleaned sea water, the raw water is first passed through prefilters like the aquaBoll®, which eliminates suspended solids from the feed water. The water is then forced through reverse osmosis membranes, which remove salt and other minerals. While waste water or brine is released overboard, the fresh water is stocked in water tanks or is directly used.

Fresh water generation system

Protection of ultra-filtration or Reverse Osmosis system

BOLLFILTER is a protection of the ultra-filtration and reverse osmosis system by retaining algae and other microorganisms.

The aquaBoll® can be adapted to reverse osmosis systems between 20 m³/hr and 1200 m³/hr.

Ultra-filtration or RO systems are expensive and delicate. Pre-filtration protects membranes and keeps ultra-filtration or Reverse Osmosis system working efficiently for a longer time.

Your benefits:

  • Footprint and weight reduction compared to media pre-filters / optimised space requirements
  • Minimal operating costs due to low maintenance
  • Long lifetime as the filters are self-cleaning
  • Easy waste management: Brine released over board. No need to dispose heavy media at the harbour
  • Precise filtration grade
  • 100% retention of spherical parts (wedge wire candles)
  • Efficient backwashing even with low feed pressure
  • Extended membrane and system service life
Grand Princess with BOLLFILTER onboard
Case Marine »

The nominal capacity of the case Marine RO unit aboard the Grand Princess is 500m³/24 hr with a BOLLFILTER automatic pre-filter to protect the membranes by retaining algae and other microorganisms


Desalination Facility on Hat Island
Desalination facility on Hat Island »

The desalination plant on the Hat Island relies on BOLLFILTER for seawater prefiltration and to replace its sand filters.

Filtration specialist: BOLL & KIRCH ▶ Sewage- & water treatment ▶ Wastewater treatments ▶ Drinking water plants ▶ Desalination plants ▶ Application-optimised filtration solutions guaranteed
Filtration solutions for water & wastewater treatment plants
Ballast water management systems ✓ Exhaust gas cleaning systems ✓ Offshore water injection systems ✓ Fresh water generation systems ▶ Many more!
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René Schüttler
René Schüttler Application Manager

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