"Conversion of waste into wealth could be an economy of Rs 10 lakh crore in India," Gadkari said while addressing the India Economic Summit here.
At a session on 'Building Blocks for Infrastructure Development', the minister said innovation and technology is needed to harness India's huge liquid and solid waste.
He cited the example of how India's largest sewage treatment plant is being set up at Mathura to purify sewage from the town and neighbouring Vrindavan and put the treated water for use at Indian Oil Corp's (IOC) Mathura refinery.
Similarly, work is likely to start on Vadodara-Mumbai Expressway while length of the National Highways is being increased to 2 lakh km from the present 96,000 km.
Stressing on development of waterways, Gadkari said tenders would be floated soon to begin work on 36 waterways.
Replying to a query that construction of barrages on Ganga would hinder flow of water, the minister said this was not correct.
Gadkari said India has been working to improve its reputation with investors by tackling historical problems.
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