Krofta Engineering Limited leads the global market in water and wastewater treatment solutions. Based in North India, Krofta specialises in designing, engineering, and installing advanced systems that set new standards for efficiency and sustainability.

A world leader in water and wastewater treatment systems.
They offer global solutions for water and wastewater treatment, resource recovery, and energy generation. They design, engineer, manufacture, install, and commission all their machines and projects. All their manufacturing is done in their facility in North India, and they provide complete turnkey solutions, including water and wastewater treatment plants and effluent treatment plants.

KEL maintains the highest quality and procurement standards. With over 4,000 installations in India alone and over 12,000 worldwide, they consistently meet customer requirements, offering reliable, on-time delivery and cost-effective solutions that operate efficiently.

They supply equipment for a wide range of applications in pulp and paper, desalination, power plants, dairy, pharmaceuticals, chemicals, municipal, food and beverage, oil refineries, and many other industries.

Over the years, they have also formed several successful partnerships with international companies to supply technology in India, the Middle East, Southeast Asia, and Africa.

DAF (Dissolved air flotation)
Dissolved Air Flotation (DAF) is a physiochemical process of solid and liquid separation developed by Krofta. It is often used in the pre-treatment or primary stage of a wastewater treatment plant to initiate suspended solids removal. Krofta has also achieved success using its DAF as a secondary clarifier to reduce properties such as colour and turbidity.

The system involves the Krofta DAF main tank, Krofta Air Dissolving Tube (ADT), chemical dosing system, recirculation pump, and an air compressor. Their DAFs can be constructed in fully metallic structures with any type of coating to meet client requirements. Further, they recommend civil tanks with metallic internal parts for very high flow rates.

Applying dissolved air flotation separates solids from liquids, such as suspended solids, oils, fats, and grease, with the help of microbubbles. These bubbles formed in the Krofta ADT attach themselves to lightweight solid particles and rise to the surface of the DAF main tank. These solid particles then form a top layer of scum which is either scraped by blades and removed from the top by a paddle wheel, in the case of their rectangular DAFs, or scooped out and removed by their scoop in the case of their circular DAFs.

The heavier solid particles settle at the bottom of the main DAF tank and are periodically removed with the help of timer-activated purge valves. The treated water passes through the middle and from the outlet nozzle.

Krofta DAF systems are designed to handle high total suspended solids (TSS) and fats, oils, and grease (FOG) loading. They can treat a range of water flow rates starting as low as 5 m3/hr and going up to over 1000 m3/hr with a single DAF unit. This is also done with the help of flocculants and coagulants, which are to be dosed at the rate and quantity mentioned by their engineers for optimal results. They additionally offer completely automated chemical dosing systems with agitators. Krofta DAFs do not need pipe flocculators since they use inline dosing methods; however, if the client specifically requires them, they design and manufacture them.

The benefits of using the floatation unit with ADT
When paired with its ADT, the KEL flotation unit offers several significant advantages. The air saturation process completes in approximately 12 seconds, ensuring rapid efficiency. The Krofta ADT boasts a compact footprint and straightforward operation and maintenance. Utilising microbubbles, their system achieves exceptionally high solids removal efficiency. Unlike other air systems that may struggle with total suspended solids (TSS) levels exceeding 2000 mg/L, Krofta DAF systems consistently deliver superior solids removal efficiency even at significantly higher TSS levels. They provide a range of five distinct DAF models, each carefully selected based on inlet parameters and specific applications following thorough assessment by their technical experts. These models include rectangular units, the Megacell featuring Lamella Plates and Unicell, and circular designs such as the Supercell, Minicell, and Sedicell, ensuring optimal performance tailored to varied operational needs.

For more information: 
visit: https://www.kroftaengineering.com/
Email: krofta@kroftaengineering.com