WATER TREATMENT.
WATER TREATMENT AND DISINFECTION OF COOLING CIRCUITS.

Doya Biológica is a company specialised in water treatment and disinfection of water cooling circuits, for example cooling towers, evaporative condensers, humidifying trays for air-conditioning units, scrubbers, closed cooler circuits...etc. We did not carry out treatment of swimming pool water, waste water and other such activities.
For treatment, we use the product CALFA BAS. This is a product developed in Japan, which consists of an inorganic solid (silver sodium borosilicate) that dissolves slowly in water, and which performs the following functions:

• On the maintenance level: it prevents and/or eliminates encrusted calcium, silica and magnesium, as well as oxide, algae and slime, so there is no need for halts in production to perform the annoying task of disassembling them plate by plate or circulating chemicals through the system.

• At a hygiene level, it prevents the presence of fungi and bacteria in the water, including the much talked about Legionella.
  The advantages of this product with respect to classical chemical products in cyclinders are:

  • It does not need impulse dosing pumps to be installed, the maintenance thereof and the constant replacement of cyclinders and the disruption that this involves.
    This is a product that dissolves slowly in water, with a useful life of approximately 6 months. The product is placed in the water reservoire of the facility, beside the aspiration filters of the pumps, as this is the area where there is most water movement, which favours dispersion of the product throughout the circuit. It does not need external storage.

  • It is a product that performs several functions: biocide, anti-caking and anti-corrosive.

  • It is not toxic or corrosive. The pH of the product in water is pH 8 and the oral LD50 is greater than 2000 mg/kg.

Other characteristics are:

• It does not foam.

• It does not need to be treated as a toxic and hazardous waste, which means it readily adapts to environmental guidelines (ISO 14001). According to waste characterisation studies carried out, the plastic cartridge that contains it would be discarded in the yellow container for plastic and the waste product can be assimilated in the urban environment.

CALFA "BAS" is a product developed in Japan, which consists of a solid organic compound (silver sodium borosilicate), which is supplied in porous bags inside polypropylene cartridges. The product is easily put in place: inside the reservoir alongside the aspiration. This is a maintenance product that carries out the following functions:

• Anti-caking effect: The sodium ions carry out an ion-exchange with calcium, silica or magnesium, replacing the caked carbonate, silicate and sulphate forms with forms less prone to caking.

• Anti-corrosive effect: The silicates stabilise the pH at round 8, thus preventing corrosive processes.

• Biocide effect: The silver ions eliminate algae and slime (brown coloured) from the exchangers.

• Anti-legionella effect: This is a product that has been shown to be effective against Legionella.

RANGE OF ACTION: Up to 5.500 microsiemens and up to 150º according to dose.

TEMPERATURE RANGE: -30º C (with ethylene glycol) up to temperatures of + 600 Degrees Centigrade. 

USEFUL LIFETIME IN WATER: Approximately 6 months (200 days).

DOSE: From 0.1-0.25% weight/volume according to the quality of inlet water. Minimum 1 pack even though the tower does not exceed a volume of 1m3. Nevertheless, the circulating flow should also be taken into account, with the dose varying between 40-60 ppm x flow in m3.
The largest value from either calculation is the one that should be used.

COMPATIBILITY: with any product, including chloride.