Technologies to Resolve Stubble Burning

Syllabus: Science and Technology, Air Pollution

Source: DTE

Context: Stubble burning, especially in northern India, contributes significantly to air pollution and haze during October and November. Despite government measures, the practice persists due to economic and operational challenges faced by farmers.

Stubble Burning

• Stubble burning is the deliberate setting of fire to crop residue after the harvest, predominantly in Punjab, Haryana, and Uttar Pradesh.

• Farmers burn paddy straw as a quick and economical way to prepare fields for the next crop cycle, especially for wheat sowing.

Reasons for Stubble Burning:

• Short Crop Cycles: Limited time between paddy harvest and wheat sowing.

• Economic Constraints: High cost of alternative residue management techniques.

• Lack of Awareness: Farmers lack knowledge about sustainable practices.

• Inadequate Mechanization: Limited availability of crop residue management machinery.

• Policy Implementation Gaps: Ineffective enforcement of regulations and insufficient incentives.

Consequences of Stubble Burning:

• Air Pollution: Emission of fine particulate matter (PM2.5, PM10), CO2, CO, and other pollutants.

• Health Hazards: Increased respiratory diseases and reduced visibility.

• Soil Degradation: Loss of essential nutrients and organic matter.

• Climate Impact: Contributes to greenhouse gas emissions.

• Economic Costs: Burden on public health systems and loss of soil fertility.

Technologies to Resolve Stubble Burning:

Large-Scale Technologies:

• Direct Combustion: Burns rice straw in controlled environments to generate heat for cooking and industrial purposes.

• Pyrolysis and Gasification: Converts rice straw into syngas or bio-oil with high heating value through controlled heating.

• Biochar Production: Produces biochar as a soil conditioner to enhance fertility and reduce greenhouse gas emissions.

• Power Generation: Uses biomass-based power plants to convert rice straw into electricity, supporting rural energy needs.

• Pellet Production: Compresses rice straw into compact, energy-dense pellets suitable for fuel and easy transportation.

• Biofuels: Processes rice straw into bioethanol, biogas, and other renewable fuels, reducing reliance on fossil fuels.

• Paper Production: Utilizes rice straw’s high cellulose content as a sustainable raw material for pulp and paper production.

Small-Scale Technologies:

• Composting: Converts rice straw into nutrient-rich organic compost for agricultural use.

• Mushroom Cultivation: Uses rice straw as a substrate for cultivating edible mushrooms, offering a cost-effective farming option.

• Silica Extraction: Extracts silica particles from rice straw for use in industrial applications like construction and electronics.

• Fodder for Ruminants: Enhances the digestibility of rice straw for use as animal feed through physical or chemical treatments.

• As an Adsorbent: Applies rice straw to remove heavy metals and toxins from contaminated water, improving water quality.

• Soil Incorporation: Incorporates rice straw into the soil to improve fertility, moisture retention, and aeration.

Conclusion:

Stubble burning remains a significant environmental challenge in India. Sustainable technologies and alternative uses for crop residue, coupled with robust policies and farmer awareness, can mitigate its adverse effects. A multi-stakeholder approach involving farmers, industries, and governments is essential for long-term solutions.

Insta Links:

• Commission-for-air-quality-management

• Mumbai, Delhi and Kolkata are the three mega cities of the country but the air pollution is much more serious problem in Delhi as compared to the other two. Why is this so? (UPSC- 2015)