JU researchers develop 'Liquid Tree' to fight urban CO₂ pollution
The Liquid Tree uses local microalgae to perform photosynthesis. Functioning like a natural tree, it takes in carbon dioxide and produces oxygen
Dhaka's worsening air pollution is making the city increasingly unliveable.
With declining greenery, carbon dioxide (CO₂) levels are rising, and the city is heating up like a desert. To tackle this challenge, researchers at Jahangirnagar University (JU) have developed an innovation called the "Liquid Tree" - a photobioreactor that absorbs CO₂ and releases oxygen both indoors and outdoors.
The device was officially launched at a seminar titled "IoT-Based Smart Liquid Trees for Carbon Footprint Mitigation in Dense Urban Areas of Bangladesh" on 25 August. The event was organised by JU's Department of Biotechnology and Genetic Engineering.
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The Liquid Tree uses local microalgae to perform photosynthesis. Functioning like a natural tree, it takes in carbon dioxide and produces oxygen. Outdoor models use sunlight, while indoor models rely on artificial light. Researchers have built two versions: one for indoor spaces and another for outdoor use.
Each unit currently costs around Tk80,000–100,000, but the price is expected to drop once commercial production begins. The algae remain effective for 8–9 months before replacement, which costs about Tk2,000–3,000. Used algae can later be applied as fertiliser.
Researchers noted that while the technology has great potential, it also comes with challenges. The initial cost is high, and the device requires regular maintenance. However, they emphasised its broader possibilities. Local algae species can be further developed, and the system could be used for producing biofuel and organic fertiliser.
In the future, it may even be integrated into urban planning. According to researchers, the Liquid Tree could create new jobs and contribute significantly to building a green economy.
They believe that in a rapidly urbanising country like Bangladesh, the Liquid Tree can be more than just a symbolic innovation – it could become a practical solution.
The indoor model, in particular, could help position Bangladesh as a global leader in this field. The technology is also considered highly effective for achieving zero carbon emissions in industries, educational institutions, and research centres.
Vice-Chancellor Professor Dr Mohammad Kamrul Ahsan said such innovations will not only benefit Bangladesh but also help reduce global carbon emissions and support the goal of zero emissions.
He assured that Jahangirnagar University will create the right environment to connect industries with this kind of research.
The Vice-Chancellor added that the Smart Liquid Tree technology has delivered more than expected. Developed with the support of JU's Research Innovation Centre (RIC-JU), the project will continue to receive full backing from the university. He also urged researchers to make this technology affordable and accessible for everyone.
The project was conducted under the supervision of RIC-JU and funded by the World Bank. The lead researchers include Professor Dr Golam Moinuddin of JU's Urban and Regional Planning Department, Professor Dr Mohammad Shahedur Rahman of the Biotechnology and Genetic Engineering Department, Professor Dr M G Sorwar Hossain of BRAC University's Electrical and Electronic Engineering Department, and M Shakilur Rahman of EPL Solutions, USA.
