Guwahati, Thursday, August 29, 2019
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IIT Guwahati, RD Grow ink MoU on water purification technology
STAFF REPORTER
 GUWAHATI, Aug 28 - Indian Institute of Technology (IIT) Guwahati has signed a Memorandum of Understanding (MoU) with RD Grow Green India Pvt Ltd on technology transfer for chemical-free treatment technique of drinking water.

The agreement was signed recently at the institute’s North Guwahati campus between Dr TG Sitharam, Director of IIT Guwahati, and Rajeev Saikia, Managing Director of RD Grow Green India Pvt Ltd.

“Drinking water contamination is a major problem in most of the States, including Assam. This ‘chemical free’ treatment technique might be useful to the citizens in the rural and urban areas. I appreciate the initiative made by the team from IIT Guwahati that has resulted in one of the successful incubations of a company, RD Grow Green India Pvt Ltd, within IIT Guwahati, which has taken up the challenge to supply contaminant-free drinking water in Assam using the technology,” said Dr Sitharam.

The technology is based on the ‘Apparatus and Method for Removal of Fluoride, Iron, Arsenic and Microorganisms from Contaminated Drinking Water’ developed by Prof Mihir Kumar Purkait of the Department of Chemical Engineering, IIT Guwahati. The technology is patented by Prof Purkait under the Indian patent ‘Number: 286481’.

Explaining the technology, Prof Purkait said, “In electro coagulation process, an applied potential generates the coagulant species in situ as the sacrificial metal anode (aluminium or iron) dissolves, while hydrogen is simultaneously evolved at the cathode. Coagulant species aggregate the suspended particles or precipitate and adsorb dissolved contaminants.”

Tiny bubbles of hydrogen and oxygen that are formed during electrolysis of water collide with air bubbles which compel the pollutant particles to float.

“Choice of electrode material depends on various criteria such as low-cost and low-oxidation potential, and inertness towards the system under consideration. Aluminium has been seen to be very effective and successful in iron, arsenic and fluoride removal at favorable operating conditions. The technology is equally effective for the treatment of industrial effluent including oily wastewater,” he added.

RD Grow Green India Pvt Ltd is an incubating company at the Technology Incubation Centre in IIT Guwahati and is working for this project for the treatment of contaminated drinking water and industrial effluent as well.

Speaking about the MoU, Saikia said, “The company is capable of handling arsenic, iron and fluoride contamination of Assam in collaboration with the State government in an appropriate manner.”

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