Disinfection is the final stage of water treatment to limit contaminants. The main disinfection technologies are UV radiation, ozone, and nanotechnology. UV radiation uses light at 253.7 nm to disrupt microorganism DNA, preventing growth. It is natural, environmentally friendly, and leaves no chemicals. Ozonation uses ozone gas produced from oxygen to deactivate viruses and bacteria faster than other methods, requiring little contact time. It leaves no chemical residues and prevents microorganism re-growth. Nanotechnology employs nano-sized materials like silver to treat water and could provide low-cost disinfection.

1. WATER TREATMENT DISINFECTION
TECHNOLOGY
Group 5

2. WatertreatmentdisinfectionTechnology
Definition
• Treatment: the process of purifying water to ensure that it is safe for
consumption or use in food and beverage production.
• Disinfection: A process by which the living cells are destroyed, by
chemical methods, with reagents that diffuse inside them
(chlorination, ozonation, UV, etc.).

3. Disinfection Technology
o Disinfection is the final stage in the water treatment process in order to limit the
effects of organic material, suspended solids and other contaminants
o There are many disinfection technology of waste water but there are three main
waste water disinfection technology
1. UV
2. Ozone (O3)
3. Nanotechnology

4. 1. Disinfection by UV Radiation
UV water disinfection technology
What is UV?
• It is light with certain wavelength
• The Wavelength is 253.7 nm with a high energy
• Inactivation of pathogenic organisms (bacteria, viruses, molds, algae, and other
microorganisms) which multiply and grow.
• the UV light disrupting the RNA and DNA of microorganisms which leaves them dead
and unable to grow further or reproduction.
• It Block the DNA replication by gluing two of the amino acid

5. Cont..
Benefits of UV Disinfection System
• Natural – UV is nature’s way of purification.
• Environmentally Friendly – No Toxic by-products are formed during the UV disinfection process
• Effective – All known microorganisms are susceptible to UV light
• Economical – Lowest operating cost among disinfection systems
• Safe and Chemical-Free – No addition of chemicals hence no danger of overdosing
• Fast – It is In-contact purification therefore Instant
• Easy to Manage – Well-designed systems like the Alfaa UV systems come with many advanced
features like CFD (Computational Fluid Dynamics), high-efficiency electronic ballasts, and
extremely precise UV intensity monitors which make them highly effective and hence easy to
manage.

6. 2. Disinfection By Ozonation
Ozonation Disinfection technology
• Ozonation is a water treatment process that destroys microorganisms and degrades organic
pollutants through the infusion of ozone.
• A gas produced by subjecting oxygen molecules to high electrical voltage. This process is
called Corona Discharge method.
• It Deactivating viruses and bacteria than any other disinfection treatment
• Requiring very little contact time, thus reducing the overall treatment residence time while
simultaneously leaving no chemical residues.

7. Cont…
• Benefits of UV Disinfection System
- No byproduct
- PH neutral
- Low off gas
- Safe, effective and reliable
- Prevents re-growth of micro-organisms
- There are essentially no harmful residuals from ozone use, as ozone undergoes a
natural decomposition in water.