Articles

                                                        BIOFILM

 

     Bacterial slimes, commonly referred to as biofilm, are gelatinous mats that resist the flow of water in distribution lines

     and through heat exchangers or condenser tubes.  A biofilm consists of microbial cells and the extracellular material

     they produce. This slime is anchored securely to a surface and provides a protective environment.

     Bacterial biofilm is normally of most concern in industrial cooling water systems, since they are normally responsible for

     fouling of chillers and heat exchanger. Algae biofilms will also foul distribution decks and tower fill and provide additional

     nutrients to support bacterial growth.

 

  Microorganisms can be found in both the bulk water and on industrial water system surfaces. 

  The bacteria can attach to the surfaces and are extremely difficult to remove. 

     Slime / Biofilm causes:

  • Reduction in heat transfer rates
  • Fouling of the condenser
  • Underdeposit corrosion and scale buildup
  • Plugging of strainers and solenoid valves
  • Fouling the filtration equipment

 

                

     Biofilm bacteria can move in numerous ways: Collectively,

     by rippling across the surface, or by detaching in clumps.

     Individually, through a "swarming or seeding" dispersal.

      MICROBIAL INDUCED CORROSION

    Another major problem is that biofilms may cause corrosion in the system (MIC).  The biofilm sets up a difference

    in potential between one area and another.  These differences will create anodic and cathodic areas which sets up a

    basic corrosion cell.  Metal is lost at the anode and the electrons given up by the metal flow to the cathode to be

    consumed in a reduction reaction.

 

          HOW DO YOU DESTROY BIOFILM?? 

   

  AGI recommends using TOWERKLEEN 142!

 

  1. Towerkleen 142 displays rapid biofilm removal and subsequent inhibition.
  2. It is a combination of surfactants, penetrants, and chelants.
  3. It will form reversible chelant complexes with the salts and inorganic ions which give structure to the biofilm.
  4. Once the structure is destroyed the adhesive ability of the BIOFILM is destroyed as well.

    DIRTY SYSTEM - USAGE RATE:  80 ozs / 1000 gallons of system capacity - added every day

       Note:  A milk-shake brownish foam will form after about 30 minutes of addition. 

    MAINTENANCE DOSAGE RATE:  80 ozs. / 1000 gallons of system capacity   (Added 1-3 times per week)

        

     ***CONTACT YOUR AGI DISTRIBUTOR FOR MORE INFORMATION ***

 

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