What Happened
- CSIR-Central Road Research Institute (CSIR-CRRI) and CSIR-Indian Institute of Petroleum (CSIR-IIP) jointly developed a technology called "Bio-Bitumen via Pyrolysis: From Farm Residue to Roads."
- The technology converts agricultural crop residue — primarily rice straw and wheat straw — into bio-bitumen that can partially replace conventional petroleum-derived bitumen in road construction.
- Union Minister Jitendra Singh announced the successful technology transfer, stating the innovation can save India approximately ₹40,000 crore annually in bitumen import bills.
- India currently imports nearly 50% of its bitumen requirements; the new bio-bitumen can replace up to 20–30% of conventional bitumen in road construction without compromising performance.
- A 100-metre trial stretch using bio-bitumen was successfully laid on the Jorabat–Shillong Expressway (NH-40) in Meghalaya, confirming field-level feasibility.
- India is the first country in the world to take bio-bitumen technology to industrial and commercial scale.
- The pyrolysis process also yields by-products including bio-pesticide fractions, energy-efficient gas fuel, and high-grade carbon suitable for batteries and water purification.
- At 15% blending, India can save nearly ₹4,500 crore in foreign exchange annually.
Static Topic Bridges
Pyrolysis and Thermochemical Conversion of Biomass
Pyrolysis is a thermochemical decomposition process that breaks down organic materials at elevated temperatures (typically 300–700°C) in the absence of oxygen. When applied to agricultural residue such as rice straw, it produces bio-oil (a liquid energy carrier), syngas, and biochar. The bio-oil can be refined and polymer-modified to improve viscosity and adhesive strength, making it suitable as a partial substitute for petroleum bitumen in road paving applications. The absence of oxygen prevents combustion, making pyrolysis distinct from incineration and yielding valuable chemicals rather than just heat and ash.
- CSIR-CRRI and CSIR-IIP used rice straw, wheat straw, and other crop biomass as feedstock.
- Process steps: collection → pelletisation → pyrolysis → bio-oil → blending with conventional bitumen.
- The resultant bio-bitumen has undergone physical, rheological, chemical, and mechanical characterisation, including rutting, cracking, and moisture damage tests.
- Multiple value streams from single pyrolysis run: bio-binder for roads, gaseous fuel, bio-pesticide fractions, and high-grade carbon (useful for batteries and water purification).
Connection to this news: The CSIR technology packages pyrolysis at an industrial scale for the first time globally, directly enabling road contractors to use farm residue in highway construction — turning a waste management problem into infrastructure value.
Crop Residue Burning and Air Pollution in India
India generates an estimated 500–550 million tonnes of crop residue annually. Farmers in Punjab and Haryana alone burn approximately 35 million tonnes of paddy straw each year (October–November) after the kharif harvest to clear fields quickly before the rabi sowing season. This stubble burning is a major source of fine particulate matter (PM2.5) and causes severe air quality deterioration across the Indo-Gangetic Plain, including Delhi-NCR. Studies estimate that agricultural residue burning causes 44,000–98,000 premature deaths annually due to particulate matter exposure, with Punjab, Haryana, and Uttar Pradesh contributing 67–90% of this burden.
- The government's Crop Residue Management (CRM) scheme (2018–ongoing) subsidises machinery for in-situ management; ₹3,623 crore released between 2018 and 2024-25.
- Despite these efforts, millions of tonnes are still burned — bio-bitumen offers an additional industrial-scale end-use for this residue.
- A 27% reduction in Punjab and 37% in Haryana in burning incidences was recorded in 2023 compared to baseline.
- Bio-bitumen technology provides a commercial demand for crop residue, giving farmers an economic incentive to sell rather than burn.
Connection to this news: The CSIR bio-bitumen pathway creates a formal market for crop waste, addressing stubble burning at source rather than relying solely on punitive regulation or subsidy for in-field management machinery.
CSIR and India's Technology Transfer Ecosystem
The Council of Scientific and Industrial Research (CSIR), established in 1942, is one of India's largest publicly funded research and development organisations, operating 37 national laboratories. CSIR-CRRI focuses on road research and transportation infrastructure, while CSIR-IIP specialises in petroleum processing and alternative energy research. Together, they represent CSIR's model of cross-institutional collaboration that links fundamental material science with applied engineering at scale. Technology transfer — licensing an innovation to commercial entities for industrial deployment — is a key output metric for CSIR laboratories.
- CSIR operates under the Ministry of Science and Technology.
- CSIR-CRRI is located in New Delhi; CSIR-IIP is in Dehradun.
- The technology was co-developed across both institutes and successfully transferred to industry in 2025-26.
- India's circular economy push under the National Resource Efficiency Policy (2019) aligns with this bio-based materials approach.
Connection to this news: The successful technology transfer from two CSIR labs to commercial production exemplifies the Atmanirbhar Bharat principle in materials science — building domestic capacity to reduce import dependence using indigenously developed science.
India's Bitumen Import Dependence and Road Infrastructure
India is one of the largest road network builders in the world, with the National Highways Authority of India (NHAI) executing thousands of kilometres of highway construction annually. Bitumen, derived from crude oil refining, is the primary binding material for road surfaces (asphalt/blacktop roads). India imports roughly 50% of its bitumen requirements, spending an estimated ₹25,000–40,000 crore annually in foreign exchange on these imports. The dependence makes road construction costs vulnerable to global crude price fluctuations and supply chain disruptions.
- India's road network is approximately 6.3 million kilometres, making it the second-largest in the world.
- Bitumen is classified as a petroleum product; India imports it mainly from the Middle East.
- Replacing 20–30% of bitumen with bio-bitumen in all road projects could translate to thousands of crores in import savings annually.
- The government's PM Gati Shakti National Master Plan aims to expand national highway construction further, increasing bitumen demand.
Connection to this news: As India accelerates highway construction under national infrastructure programmes, reducing import dependence on bitumen through domestically produced bio-bitumen directly supports both fiscal prudence and energy security.
Key Facts & Data
- Bio-bitumen feedstock: rice straw, wheat straw, other agricultural crop residue (post-harvest biomass).
- Replacement capacity: up to 20–30% of conventional bitumen without performance compromise.
- Import saving potential: ₹40,000 crore/year (full-scale deployment); ₹4,500 crore/year at 15% blending.
- India currently imports ~50% of national bitumen requirements.
- Trial stretch: 100 metres on Jorabat–Shillong Expressway (NH-40), Meghalaya — successfully demonstrated.
- India is the first country to commercialise bio-bitumen at industrial scale.
- Pyrolysis by-products: bio-pesticide fractions, gaseous fuel, high-grade carbon.
- Developing institutes: CSIR-CRRI (New Delhi) and CSIR-IIP (Dehradun), both under CSIR/Ministry of Science and Technology.
- Crop residue burning contributes significantly to India's air pollution crisis, particularly in Punjab and Haryana (kharif harvest season, October–November).