Richa Bansal: In Gujarat MANTRA has identified parali–the leftover portion of the plant after harvesting wheat or rice—as a waste material, and now converting it into compostable usable products. Kindly elaborate on this. Parali burning, as we all know, is a major pollutant in northern India, especially in winter.
Arup Rakshit: As you said, parali burning is indeed a major problem in northern India, especially in winter. In agriculture, plastics are widely used to make small cups for saplings. What we have done is develop biodegradable cups made from parali. Chips of parali are moulded into cups that can hold saplings. When planted, the whole cup goes into the soil and decomposes automatically.
Recycling it as a sustainable product could reduce that problem. Farmers could sell parali instead of burning it, earning income while reducing pollution. If scaled up, every nursery across India could use the biodegradable parali cups instead of plastic ones. The prototype is ready, and a patent is in process. In the next couple of months, we will expand it into a full project either under the National Technical Textiles Mission under the Ministry of Textiles or the Ministry of Agriculture.
Richa Bansal: What are the other projects that MANTRA is working on.
Arup Rakshit: Sustainability is not only about technology; it is also about livelihoods. And, we are working on several projects:
- There is the riverbank reinforcement fabric with IIT Bhubaneswar. Floods and overflowing rivers destroy riverbanks. We have developed a nonwoven fabric from recycled PET fibres—essentially plastic bottles. It is a nonwoven sheet, strong and durable, and it is specifically designed for geotextile applications. It has already shown promise in preliminary tests. We have supplied 10,000 metres to IIT Odisha, where it is being evaluated and modelled. Field trials will follow. The project is funded by the Science and Engineering Research Board under the Department of Science and Technology.
- Another major project is developing a geogrid machine which will produce geogrid fabric three to five metres wide. Geogrid is an open-mesh fabric used for soil stabilisation. Imagine a net with openings large enough for soil and vegetation to integrate with it.
Once laid, vegetation grows through the fabric, strengthening the soil structure. The geogrids will thus reinforce soil surfaces on roads, riverbanks, and slopes, preventing erosion and stabilising terrain. Earlier, geogrids were imported, made from ordinary fibres. Ours will use high-tenacity polyester or nylon fibres with coatings in open mesh structure so that they last longer.
In road construction, cracks and depressions occur because of water accumulation. Nonwoven layers beneath the road allow water to drain sideways, preventing instability. Geogrids above them stabilise the surface, preventing cracks. This technology has been used abroad for decades. In India it is now beginning to be adopted, and our machine will support that adoption.
We have received principal approval. With a budget of about ₹15 crore, we plan to deliver a prototype in 24 months.