Wastewater contains high concentrations of bacteria and other coliforms. It can also contain other microorganisms like viruses. Without adequate treatment, wastewater can easily spread diseases. As a result, disinfection is a key part of wastewater treatment. Modern processes like MBR, MBBR and UF can treat wastewater to a high level. Regardless, they are not designed for disinfection. Consequently, UV plays a key role in wastewater disinfection.
Chlorine has its limitations in wastewater disinfection and costs of ozone disinfection of wastewater are prohibitive.
UV offers a reliable, non-chemical and economical way to disinfect wastewater. Moreover, UV disinfection is easy to monitor online and doesn’t require constant supply of chemicals.
Advantages of UV disinfection
- No microorganism is known to be immune to sufficient UV dose. Correctly used UV disinfection is effective against bacteria, viruses, spores, cysts, oocysts, yeasts, fungi, algae, etc.
- Non chemical hence inherently safe
- Easy to measure and control online
- Online disinfection without requiring mixing tanks or holding periods
- No risk of overdosing – generally the higher the UV Dose the better
- Very economical
- No corrosion
Limitations of UV disinfection
- Suspended matter, grease and humic acids in wastewater absorb UV-C energy.Therefore, UV disinfection requires good wastewater treatment.
Selection of wastewater UV lamp units depends on several factors. For example, peak flow rate, %UVT of wastewater, discharge regulations, all play a key role.
For higher flow rates found in community & small to midsize wastewater treatment plants, ADV-F™ Series is an ideal solution. It has multiple UV lamps, manual quartz sleeve wipers and hydraulic design to promote turbulence. Optional UV intensity, monitors are available.
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