A High Performance Vortex Cavitation Reactor System

What Is VoDCa?

VoDCa , an abbreviation for Vortex devices for Cavitation, is an advanced oxidation reactor that harnesses power of cavitation.

Cavitation is a physical phenomenon involving bubble formation, growth and adiabatic collapse, with the consequent generation of intense pressure and temperature (~1000 atm, ~5,000 K). These conditions lead to the formation of hydroxyl radicals (OH•), extremely reactive oxidising agents that can decompose pollutants

VoDCa’s patented, CFD-optimised design, comprising a tangential inlet and cylindrical axial outlet connected by a disc shaped chamber, imparts and conserves angular momentum of fluid through the process. It creates a sufficient pressure drop to produce cavities/ micro-bubbles which are collapsed in a controlled manner downstream of the system.

Value Features of VoDCa

Unlike the conventional devices used for hydrodynamic cavitation (orifice,venturi etc.), rotating flow in a VoDCa offers several attractive features suitable for beneficially harnessing cavitation



Market Applications of VoDCa


Industrial WWTPs

Industrial Waste Water treatment is highly complex and no single solution can fit all the use cases. Advanced oxidation solutions such as cavitation are useful in instances where conventional technologies are not suitable. Also there exists a hidden opportunity wherein the extent of process intensification brought about by the OH radicals can be so significant that it can be a very attractive commercial proposition and thus should be pursued for its investigation. With its maintenance free and robust retrofit , VoDCA maximises the generation of OH radicals without addition of chemicals which in turn maximises the potential of process intensification in Industrial Waste Water Treatment Plants.


Water De-Scaling In Cooling Towers

VoDCa can also be used for Water Descaling from Cooling Towers. At the moment this product is still being developed , however trials can be offered under an agreement.


Reaction Intensification In Multiphase Systems

VoDCa can also be used for intensifying multiphase reactions (gas-liquid, liquid-liquid). However such specific developments using VoDCa are undertaken on a project basis.

See The Introductory Video

VoDCa Retrofit In Industrial WWTPs

COD Reduction

20 to up-to 70% reduction

More Biogas – Digester

Improving Bio-Degradibility


Ammoniacal Nitrogen Reduction

Color Reduction

15 to up-to 60% reduction

Our Team

Rahul Dahule

Rahul has a track of versatile career roles within a successful startup and multinationals. Within Water Knight Rahul wears many hats; he has a background in chemical engineering and has a rich technical and business experience in product development, plant operations and marketing within established startups  and multinational companies such as The Dow Chemical Company and Philips Lighting. Rahul is researching and developing new technologies and new markets that leverage the technology of vortex cavitation. He has four publications in scientific journals and has five patents (two granted) to his credit. A true creative thinker and a fine art connoisseur, Rahul’s mind is always on lookout for complex experiments and meaningful inventions.

Ranjeet Utikar

Ranjeet, is a result driven professional with over twenty years extensive experience in technology development in chemical / oil and gas, and industrial biotechnology sector. Ranjeet’s work in the area of industrial flow modeling has resulted into direct measurable benefits to the chemical, environmental and auto industries. Ranjeet is also a senior academic researcher in Chemical Engineering at Curtin University, Australia and he has published more than 60 peer reviewed research papers in premier international journals. Ranjeet, together with Vivek had successfully founded Tridiagonal Solutions in the past serving process solutions in flow modelling to various industrial segments. He is an ardent art lover and spends his perfect day by riding his high-tech motorbike on a long and adventurous journey.

Vivek Ranade

Vivek, a world renowned expert, who has contributed significantly to chemical engineering science and practice. His work has resulted in new insights and better designs of industrial flow processes. He has successfully developed solutions and has facilitated their implementation in a wide range of industry. Vivek is the principal inventor of VoDCa, and is constantly looking out to solve challenging problems within various industrial processes. He is also a professor of Chemical Engineering at Queens University in Belfast. He has published more than 125 papers and four books, and is co-inventor of more than 20 patents (granted or filed). A firm believer in humanity, Vivek actively supports various campaigns for social causes.

Latest News

Water Knight, European collaborating arm of Vivira Process Technologies, Awarded Top Prize At AkzoNobel Imagine Chemistry Challenge 2018

By | Water Treatment

Gothenburg, Sweden:  Water Knight, based in The Netherlands, was selected as a grand prize winner at the  2018 Imagine Chemistry Challenge finals for their submission “Wastewater treatment intensification through high performance vortex cavitation

Imagine Chemistry is an open innovation collaboration platform of the AkzoNobel Specialty Chemicals that invites startup innovators from around the world to help AkzoNobel solve real life chemistry challenges faced by their businesses. This challenge creates value-added joint partnerships between promising startups and AkzoNobel Specialty Chemicals. In this year’s second edition of the Imagine Chemistry challenge, co-hosted by AkzoNobel and KPMG, there were over 150 submissions of which 20 teams were cherry picked to join the finals event that took place at Chalmers University in Gothenburg, Sweden.

As one of 20 finalists, Ranjeet Utikar and Rahul Dahule of Water Knight who presented the idea on Wastewater treatment process intensification using VoDCa (Vortex based devices for cavitation), an advanced oxidation reactor technology, won the joint development award with AkzoNobel Specialty Chemicals under the challenge area of the Waste Water–Free Chemical sites.

Water Knight, an European collaborating arm of Vivira Process Technologies, is commercializing the technology of VoDCa in Europe. Vivira Process Technologies based in India is a start-up from the National Chemical Laboratory (NCL), which is a prestigious research lab of India.

“This final selection holds great potential to address customer needs and contribute to a sustainable future.” said Peter Nieuwenhuizen, Chief Technology Officer at AkzoNobel Specialty Chemicals.

Prof. Vivek Ranade, a principal inventor of VoDCa technology and a core team member of Vivira Process Technologies, said, “We, working as a one team, are honored and very much pleased to be selected as a grand prize winner in the competition. This marks an important milestone in realizing the potential of VoDCa Technology in solving some of the challenging problems faced by chemical industries.”

Winners of the competition received letters of intent to negotiate a Joint Development Agreement with AkzoNobel. Full story can be found here.

Water Knight is a finalist at this year’s “Waste Water–Free Chemical sites” challenge area of AkzoNobel Chemicals

By | Uncategorized | No Comments


Water Knight is selected as one of the finalists amongst 150 idea submissions received worldwide on the portal of Imagine Chemistry.


Imagine Chemistry is an open innovation collaboration platform of the AkzoNobel Chemicals’ startup – a challenge that creates value-added joint partnerships between promising startups and AkzoNobel Chemicals.

Water Knight’s idea on “Wastewater treatment process intensification through high-performance vortex cavitation reactor producing OH radicals” is selected under the challenge area of the Waste Water–Free Chemical sites.

Under this challenging area, AkzoNobel is looking for improved methods to purify their wastewater streams to decrease the environmental impact by reducing the organic matter content, reusing the water amid specific challenging areas within their Waste Water Streams.

As one of the finalists,  Water Knight will now participate in a three-day event in June at the Chalmers University of Technology in Gothenburg, Sweden,

We will work with AkzoNobel Specialty Chemicals experts and partners in R&D, finance, innovation, and marketing, as well as senior management and potential investors, to further develop, sharpen and strengthen our value proposition on the vortex cavitation.

Exciting time for our company!

Find Us



Agora 4, 8934 CJ, Leeuwarden,

The Netherlands

Contact Us