Wastewater Disinfection

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Wastewater: The Need for Disinfection

Wastewater quality measurement parameters commonly used in India focus on BOD, COD, TSS etc. Microscopic bacteria & viruses which can neither be seen nor smelled are present in abundant quantities in tertiary treated wastewater posing a grave but silent threat. All commonly heard of water-borne diseases such as Typhoid, Hepatitis and Gastroenteritis originate from wastewater.

Most developed countries that reuse wastewater, have stringent guidelines on the microbiological contamination levels present in the wastewater before it is allowed to be reused. These norms pay particular emphasis on wastewater disinfection or treatment required in an urban setting. Because urban reuse usually involves irrigation of landscapes (with unrestricted public access) or other types of reuse where human exposure to the reclaimed water is likely (such as toilet flushing, car washing etc.) Reclaimed water must be of a higher quality than may be necessary for other reuse applications. Therefore, while recycled wastewater might appear clean and clear to look at, high levels of dangerous pathogens require that wastewater is thoroughly disinfected prior to reuse.

Why Use UV for Wastewater Disinfection or for Industrial Wastewater Treatment?

UV as an alternative to traditional chlorination has become the preferred choice for wastewater disinfection worldwide.

  • GoGreen with Alfaa
  • The uncontrolled release of chlorinated compounds into the environment has created a global issue. In keeping with trends in developed countries and taking a responsible step forward to safeguard the environment, Alfaa uses environmentally friendly UV technology for wastewater disinfection and industrial wastewater treatment.

  • Chlorine Disinfection By-Products
  • Trihalomethanes and other toxic chlorine by products are known to cause cancer in humans. When used for gardening, reused wastewater along with these carcinogenic compounds make their way into the subsoil and water table. When this water is pumped through borewells and used for drinking these carcinogens put you at risk.
    Moreover, chlorinated water with concentrations greater than 5 mg/l causes severe damage to most plants and as such should not be used for gardening and landscaping purposes with first dechlorinating.

    UV wastewater disinfection is a natural, chemical-free process which produces no trihalomethanes or carcinogens.

  • Convenience
  • Chlorine disinfection creates operational and logistical hassles such as repeated procurement, storage, handling, dilution and mixing. It requires constant attention and supervision.

    UV wastewater disinfection system utilises no chemicals, works online, requires no supervision and minimal maintenance.

  • Operator Safety
  • Leaks and spills of chlorine may lead to burns, permanent vision damage and lung damage.

    Be it for wastewater disinfection or for industrial wastewater treatment, UV disinfection presents no handling, safety, flammability or explosion issues.

  • Cost
  • Sodium Hypochlorite or “liquid chlorine” is expensive, with high running costs and associated handling costs.

UV wastewater disinfection system is cost-effective with payback periods in most cases less than 2 years.

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