Using ultraviolet (UV) light for drinking water disinfection dates back to 1910. It is a reliable means of disinfection which involves exposing contaminated water to radiation from UV light. The treatment works because UV light penetrates an organism’s cell walls and disrupts the cell’s genetic material, making reproduction impossible.
UV disinfection can remove the threat to health from water borne Pathogens without the creation of disinfection by products that can be generated from drinking water chlorination. From the common bacteria, E-Coli through the Cryptosporidium Oocysts to Adenovirus, UV disinfection is capable of providing effective treatment to ensure inactivation of these pathogens and ensure drinking water is safe.
The advantages of using UV, rather than chemical disinfection, include:
Most developed country 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 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.
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.
Problems with Chlorine Disinfection
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 de-chlorinating.
UV disinfection is a natural, chemical free process which produces no trihalomethanes or carcinogens.
UV as an alternative to traditional chlorination has become the preferred choice for wastewater disinfection worldwide.
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 to treat wastewater.
Chlorine disinfection creates operational and logistical hassles such as repeated procurement, storage, handling, dilution and mixing. It requires constant attention and supervision.
UV disinfection utilizes no chemicals, works online, requires no supervision and minimal maintenance.
Leaks and spills of chlorine may lead to burns, permanent vision damage and lung damage.
UV disinfection presents no safety, handling, flammability or explosion issues.
Sodium Hypochlorite or “liquid chlorine” is expensive, with high running costs and associated handling costs.