Biological Control and Biocides

Cooling Water and other industrial process waters can be ideal breeding grounds for biological growth, including algae, bacteria, sulfate-reducing bacteria, and fungi. If not properly controlled, these organisms will form a layer of bio-slime that acts as a natural adhesion surface for mineral scales and debris, resulting in increased corrosion rates, restricted water flow, reduced system efficiency and Legionella bacteria growth.

WMT offers a variety of broad-spectrum, water-dispersible microbiological control agents, including oxidizing biocides and non-oxidizing biocides, that inhibit microbial growth in cooling water systems.

Our non-oxidizing biocides include standard active products and proprietary blends, and our oxidizing biocides include conventional technologies, such as hypobromous acid and hydantoins, as well as novel technologies that dramatically reduce microbiological activity without the adverse side effects associated with strong oxidizing biocides.

Read on, request more information or contact us now to learn more.


Oxidizing and Nonoxidizing Biocides

These compounds oxidize protein groups on and within the cell, resulting in the loss of normal enzyme activity necessary for respiration and cell metabolism. Chlorine is the most widely used oxidizing biocide and is applied in most cooling and process waters that operate below pH 8. Bromine-based biocides are more effective at higher pH levels, making them ideal for use in systems that operate above pH 8 and up to pH 9. Oxidizing biocides include stabilized sulfamates, isocyanurates, slow-release hydantoins, and chloramine-based biocides.

When oxidizers alone are insufficient to control microbial growth, or if halogen-based biocides cannot be used, nonoxidizing biocides can be added. These products operate via different mechanisms than those of oxidizing biocides and require specific considerations during product selection. System pH, temperature, biofilm presence, and contaminants like ammonia or sulfide should be considered when selecting the appropriate nonoxidizing biocides. Unlike oxidizing biocide programs, nonoxidizing treatment needs to be reassessed over time to correct for natural variations that may occur in the system.

Combining oxidizing biocides with nonoxidizing biocides provides optimal microbial control to address biofouling in difficult-to-treat systems. A comprehensive approach to microbial control can result in:

  • Unsurpassed bulk water cleanliness
  • Improved biofilm control
  • Improved heat exchanger cleanliness
  • Optimized treatment costs

Regardless of the type of product employed, our microbiological control programs are designed with careful consideration given to safe handling and operation while utilizing state-of-the-art chemical feed systems with advanced monitoring and control capabilities.

Once the treatment program is initiated, WMT’s field engineers can periodically monitor the biological activity, as biocides may need to be alternated to provide the best treatment.

Note: If you need additional assistance, please contact Wastewater Management Technology at 1-800-WET-WATER or email us at orders@wastewatertreatmenttechnology.com