Disinfection is the last stage of the municipal wastewater management process or sewage treatment plants. Prior to being released into the receiving body of water, UV treatment is necessary to reduce and degrade the microorganism populations in the sewage.
In this blog, we will learn about the ultraviolet systems, and their role in killing bacteria in sewage treatment plants.
What is a UV system? What is the role of UV systems to disinfect bacteria in STPs?
An effective way to disinfect tainted sewage water is to expose it to UV light rays. The treatment works because UV light can get past cell barriers, to damage genetic material and stop reproduction.
A specific lamp creates UV light by creating an electric arc through low-pressure mercury vapour. This lamp produces a wide range of energy with strong peaks at UV wavelengths of 253.7 nanometres (nm), and a less intense peak at 184.9 nm. The optimal UV wavelength range for destroying germs is between 250 and 270 nm.
A germicidal ultraviolet light system is used to disinfect the water after being injected with microbiologically hazardous water. This light will change the DNA of certain microbes, making water clean.
How does UV system disinfect/kill bacteria in STPs?
Microorganisms are quickly and effectively rendered inactive by UV light through a physical process. Microorganisms are instantly rendered unable to reproduce and spread infection when exposed to germicidal UV light wavelengths. Only UV light is added to the sewage during the process, which has no effect on the dissolved oxygen level or chemical make-up.
Viruses, bacteria, algae, moulds, and other germs that can swiftly develop and reproduce, and cause a variety of diseases are all destroyed by ultraviolet light. Such bacteria' DNA is destroyed by UV technology, rendering them incapable of proliferating further. A UV bulb inside a glass quartz sleeve transmits UV light, which sends germicidal radiation that can render a number of living things inactive.
Microorganisms eliminated by UV Systems
Cholera, algae, fungi, Salmonella, Cryptosporidium, Giardia, e-coli, and other dangerous pathogens, can all be eliminated by Netsol Water Solutions’ Ultraviolet Systems. It should be emphasised that while UV radiation screens microbes from treated water, it does not eliminate suspended particles. Therefore, in order to obtain pure, clean water that can be used for various domestic or commercial activities, UV treated water must be sent through another filtration system, like RO Plants.
Advantages of UV systems
· It is more effective than chlorine at preventing the spread of viruses, as chlorine is becoming less popular because to its hazardous by-products, handling issues, and overdose risk.
· Due to the immediate treatment process, lack of holding tanks, and short retention periods, the footprint is minimal.
· Extremely cost-effective because to cheap start-up, running, and maintenance expenses.
· There are no chemicals added to the water supply, thus there are no by-products and no specialised storage needs.
· No change in water conductivity, pH, taste, or odour.
· No moving parts to wear out, simple and easy maintenance, periodic cleaning, and annual lamp replacement.
· Only requires water connections and one electricity connection for installation.
Municipalities that deal with wastewater reuse must strike a balance between rising population, dry climates, and intense irrigation/agricultural needs. Recycled wastewater offers a low-cost, nearby, and sustainable water source for a variety of non-potable uses, which can be achieved with the use of UV sewage treatment systems.
Limitations of UV systems
The UV unit's effectiveness is significantly impacted by two key aspects of water quality: microbial and chemical features.
Type, source, age, and density of microbes are among the properties of sewage. The presence of nitrites, sulphites, iron, hardness, and aromatic organic compounds are chemical features of sewage.
Sewage with large concentrations of suspended particles, turbidity, colour, or soluble organic matter, should not be exposed to UV light. These substances may react with UV light and reduce the effectiveness of disinfection, because radiation has difficulty penetrating water due to turbidity.
Applications of UV disinfection
Drinking water |
Food Processing |
Medicine |
Schools & Colleges |
Bottled water |
Pharmaceutical |
Residential |
Beverages, Fruit juices |
Laboratories |
Factories & offices |
Breweries & Wineries |
Dialysis |
Ice Making |
Wastewater |
Labs |
Vending machines |
High quality UV systems from Netsol
Clean water is produced by Netsol Water UV treatment systems, which are designed, built, and installed with safety and the environment in mind. Our various sewage disinfection systems can be constructed according to the needs of the customer.
We also encourage our clients to talk to us about the high-quality, pure water they need. Call us at +91 9650608473 or email at enquiry@netsolwater.com for further information.