India's First Microalgae Air Purification

Summary of the Microalgae-Based PureAir Tower™ Initiative

Introduction to PureAir Tower™:

• New Delhi has commissioned its first microalgae-based PureAir Tower™, a science-driven urban air purification system installed along the Aerocity highway corridor.
• The tower uses photosynthetic microalgae to absorb and convert harmful pollutants (CO₂, PM, NOx) into oxygen and algal biomass.

Technology and Design:

• Unlike traditional smog towers reliant on mechanical filtration, the tower integrates into existing road structures, essentially transforming them into functional biological air purifiers.
• Each PureAir Tower™ has the air purification capacity equivalent to more than 15 mature trees, targeting emissions from dense traffic zones.
• In addition, CPA has contracts in place for three more towers and one-kilometre installations of Carbelim BioDivider™ panels, offering equivalent purification to roughly 500 trees.

Operational Mechanism:

• Operates on a closed-loop biological cycle, converting captured pollutants into usable algal biomass for further processing (bio-fertiliser or biochar), avoiding hazardous by-products.
• The technology involves collaboration with IIT Madras and is supported by IIM Lucknow’s Enterprise Incubation Centre.

Broader Environmental Strategy:

• The initiative aligns with a larger industrial focus on carbon capture, utilisation, and storage (CCUS) to help industries like energy and steel reduce their carbon footprints.
• The startup Carbelim has developed a proprietary consortium of microalgae, engineered for high CO₂ capture efficiency, through extensive R&D activities in India, the UK, and UAE.

Air Quality Context:

• Delhi's Air Quality Index (AQI) often reaches "Severe" levels, with PM2.5 concentrations exceeding WHO safety limits significantly during winter months.
• The PureAir Tower™ signals a shift towards embedding environmental infrastructure as part of urban planning, aiming for a long-term impact on pollution mitigation.

Importance of the Initiative:

• This represents a novel approach to handling air quality issues in urban environments, focusing on natural bioremediation rather than just emergency measures.
• Positions Delhi as a pioneer in integrating biological systems within urban infrastructure to combat air pollution.

Key Facts and Figures:

• Each PureAir Tower™ = Purification capacity of 15 mature trees.
• A one-kilometre installation of BioDivider™ panels = Equivalent impact of approximately 500 trees.
• System is expected to operate efficiently for 18 months from a single inoculation.
• Potential return on investment for industries employing CCUS = Capital payback within three years.

Economic and Policy Implications:

• Encourages sustainable urban development and innovative environmental solutions in line with India’s commitments to combat climate change.
• Offers a model of scalability that could be replicated in other urban areas facing similar pollution challenges.

Conclusion:

The PureAir Tower™ initiative reflects a significant step towards enhancing urban air quality through innovative, nature-based solutions, emphasizing the need for continuous development in environmental technologies and sustainable urban infrastructure.