Biocidal Treatment in Cooling Towers

By introducing air (oxygen) into the cooling water circuit growth of algae, fungi and bacteria is promoted intensively. These are able to form deposits which hinder heat transfer in the cooling unit and by that are reducing cooling capacity; moreover they promote aeration corrosion.

By the application of specialised biocides, but which yet have to be harmonized with the hardness stabilizers applied, above mentioned microbiological growth in a cooling tower or within the cooling system on the whole can be prevented

The following products are suitable for this purpose:

Oxidising biocides

  • Bromine containing biocide combined with heterocyclic, biocidal nitrogen compounds, having a remerkably wide spectrum of activity.

  • Bromine containing biocide in tablet form, effective against algae and all kinds of bacteria (including legionella and mucus forming bacteria), mainly for industrial water circuits; special advantage compared to chlorine: Effectiveness especially at higher pH values.

  • An inoganic granulate with 60 – 65 % (bw) active chlorine, based on calcium hypochlorite; even when stored for years almost no loss in active substance; for disinfection of drinking, raw and bathing water.

  • Chlorine dioxide as a highly effective broad-spectrum biocide; operates via oxygen oxidation – produced directly for application by mixing both supplied components before use.

Non-oxidising biocides

  • Protection based on specialised QACs, for treatment of cooling waters and swimming pools against algae (green, bluegreen and black algae), bacteria and fungi; effective over a wide pH range.

  • Protection based on specialised QAC polymers, for treatment of cooling waters and swimming pools against algae (green, bluegreen and black algae), mucus forming bacteria and wood affecting fungi (cooling towers); effective over a wide pH range.

  • Bromine free biocide, containing heterocyclic nitrogen compounds, effectively controls algae, bacteria and fungi growth; special advantage: very good solubility in water – hence a very fast dissemination within the whole system after adding.

Degradable biocides

One of the claims of environmental protection is, that a certain biocide should be highly effective within the cooling circuit, but should degrade afterwards into harmless constituents as soon as possible. To satisfy such claims we offer biocides (based on chlorine, bromine or oxygen) which are short-lived and are degraded rapidly, as for example: