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Welcome to the ABC of water treatment

Each week, we highlight essential chemicals and their applications to help you optimize your water treatment processes. In this episode, we focus on disinfectants, a crucial type of water treatment chemical for ensuring clean and safe water.

What are disinfectants?

Disinfectants are crucial chemicals and processes used in water treatment to eliminate harmful microorganisms, including bacteria, viruses, and protozoa. They are essential for ensuring safe and clean drinking water, as well as maintaining water quality in various applications.

Examples and characteristics of disinfectants

  • Chlorine: Widely used for its effectiveness and relatively low cost. Provides residual protection in distribution systems
  • Chloramine: Typically used as a secondary disinfectant for long-lasting residual disinfection in distribution systems
  • Chlorine dioxide: Effective against biofilms and maintains efficacy over a wide pH range. Available as ready-to-use solutions and through on-site generation
  • Ozone: Highly effective against a wide range of microorganisms and can improve taste and odor. Requires on-site generation due to instability
  • Ultraviolet (UV) light: Physical disinfection method effective in inactivating microorganisms without chemicals. Does not provide residual disinfection

Read on to learn more about its applications, benefits and other key insights.  

Applications in water treatment 

  • Drinking water disinfection: Eliminates pathogens to ensure safe human consumption
  • Wastewater treatment: Disinfects treated effluent before discharge, preventing the spread of waterborne diseases
  • Cooling water treatment: Limits microbial growth, ensuring safe and effective process operation
  • Swimming pools and spas: Maintains hygienic conditions in recreational water facilities
  • Industrial process water: Ensures water quality for various manufacturing processes
  • Food and beverage industry: Maintains hygiene in production and processing

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Product benefits

  • Effective pathogen control: Eliminates a wide range of harmful microorganisms, making water safe and clean
  • Prevents waterborne diseases: Protects public health by killing pathogens
  • Versatile applications: Suitable for various water treatment processes and industries
  • Biofilm control: Some disinfectants are particularly effective against biofilms in distribution systems
  • Residual protection: Certain disinfectants provide ongoing protection in water distribution networks

Properties, safety and usage guidelines

Properties

 

  • Chemical nature: Includes chlorine-based compounds (chlorine, chloramine, chlorine dioxide), ozone, hydrogen peroxide, peracetic acid, and physical methods like ultraviolet (UV) light
  • Solubility: Chemical disinfectants like chlorine and ozone are soluble in water, while UV light systems work by irradiation. Solubility affects the application and effectiveness of the disinfectant
  • Stability: Stability varies significantly among disinfectants. For example, chlorine is relatively stable, while ozone degrades rapidly. Factors such as temperature, pH, and light exposure can affect stability and efficacy
  • Form: Available in liquid (e.g., sodium hypochlorite), solid (e.g., calcium hypochlorite), gas (e.g., chlorine gas), or as UV light systems
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Usage guidelines

 

  • Apply at recommended dosages to ensure effective microbial control. Typical chlorine dosages in drinking water range from 0.2 to 5 mg/L, depending on water quality and regulations.
  • Consider contact time: Ensure sufficient contact time between the disinfectant and water for effective pathogen inactivation.
  • Monitor residual disinfectant levels regularly for ongoing antimicrobial efficacy and regulatory compliance.
  • Account for water quality parameters: pH, temperature, and organic matter content can affect disinfectant efficacy.
  • Implement proper mixing and dosing strategies to optimize disinfection and minimize byproduct formation.
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Safety precautions

  • Use biocides safely. Always read the label and product information before use.
  • Handle with care due to their strong oxidizing properties. Many disinfectants are corrosive to metals and irritating to skin and eyes.
  • Use appropriate PPE, including chemical-resistant gloves, safety goggles, and respiratory protection when necessary.
  • Ensure proper ventilation in areas where disinfectants are used or stored to prevent accumulation of harmful vapors.
  • Store in a cool, dry, well-ventilated area away from incompatible materials and direct sunlight.
  • Be aware of potential disinfection byproduct formation and implement strategies to minimize their occurrence.

Join us again soon for another episode of in the ABC of water treatment, where we continue to share valuable insights and practical advice.