img(height="1" width="1" style="display:none" src="https://www.facebook.com/tr?id=2939831959404383&ev=PageView&noscript=1")

Carbon-eating bio curtains – the answer to city pollution?

Words:
Stephen Cousins

Trial installations shroud buildings with algae-filled curtains that absorb carbon dioxide and release oxygen

Microalgae in the pillows captures and stores CO2 molecules and air pollutants and grows into biomass.
Microalgae in the pillows captures and stores CO2 molecules and air pollutants and grows into biomass. Credit: PhotoSynthEtica Dublin by ecoLogicStudio with The Bartlett UCL and Innsbruck University. Photo: @NAARO

Buildings in space-starved cities could soon become shrouded in curtains of pollution-eating algae as the inventors of the carbon capture technology seek to commercialise a product.

The ‘urban curtain’ photobioreactor is an opaque bioplastic membrane covered with pillows of algae that capture and store CO2 from the atmosphere and release oxygen.

The system was developed by PhotoSynthetica, a company set up by London-based architect EcoLogicStudio in partnership with researchers at Bartlett University College London (UCL) and the University of Innsbruck. It is intended as an efficient and slimline alternative to planting trees and shrubs in cities with limited space.

  • A prototype curtain installed in 2018 on the Printworks building at Dublin Castle covers  the first and second floor of the main facade.
    A prototype curtain installed in 2018 on the Printworks building at Dublin Castle covers the first and second floor of the main facade. Credit: PhotoSynthEtica Dublin by ecoLogicStudio with The Bartlett UCL and Innsbruck University. Photo: @NAARO
  • The latest prototype, with a bioplastic membrane, was installed on the House of Nobility as part of Helsinki Fashion Week 2019.
    The latest prototype, with a bioplastic membrane, was installed on the House of Nobility as part of Helsinki Fashion Week 2019. Credit: PhotoSynthEtica Helsinki by ecoLogicStudio with The Bartlett UCL and Innsbruck University. Photo: @TuomasUusheimo
  • Prototype algae curtains were able to remove one kilo of CO2 per day, equivalent to 20 large trees.
    Prototype algae curtains were able to remove one kilo of CO2 per day, equivalent to 20 large trees. Credit: PhotoSynthEtica Helsinki by ecoLogicStudio with The Bartlett UCL and Innsbruck University. Photo: @TuomasUusheimo
123

The latest trial installations, on buildings in Dublin and Helsinki, used innovative bioplastic membranes instead of ETFE and were able to remove one kilo of CO2 per day, which is equivalent to 20 large trees.

Efforts are under way to refine the system, explore the potential to harvest the algae biomass created as the raw material used to produce the bioplastic and find a manufacturer to bring a product/s to market in 2020.   

Claudia Pasquero, director of the Urban Morphogenesis Lab at the Bartlett UCL and co-director of EcoLogicStudio, says: ‘UCL is experimenting with producing a 100% bio-based plastic that will allow us to push for innovation in the manufacturing system. We will be looking for manufacturers that can integrate these materials and produce a bio-based foil.’

The algae curtain is custom designed for the building and its context to optimise algae growth. A series of modules use daylight to feed living micro-algal cultures. Unfiltered air introduced at the bottom of the curtain creates bubbles that rise through the watery medium, coming into contact with voracious microbes.

CO2 molecules and air pollutants are captured and stored by the algae and grow into biomass. The culimination of the process is when freshly photosynthesised oxygen is released at the top of the curtain and into the urban microclimate. The algae is luminescent, making it possible to create attractive night-time displays.

EcoLogicStudio is testing the use of large-scale, high resolution 3D printing to make solid photo-bioreactor components which could be integrated into a permanent structural facade.

A prototype bio-sculpture of the system, created for display at the Centre Pompidou in Paris and currently being exhibited in Vienna, has a thick porous skin impregnated with algae as a form of biogel and is designed to increase air pollution filtering.

The plan is to offer both soft curtain and hard facade options based on the requirements and context, says Marco Poletto, co-director of EcoLogicStudio: ‘The 3D printed solution was developed to address the air quality issue and the thick permeable membrane essentially functions as a large filter. The algae curtain relies on a certain amount of equipment and machinery, but if you want to maximise the production of biomass it is currently the most productive and efficient system. It is really the question of the context and the building typology.’


 

Latest

Rescue and restore a Willliam Adam-designed villa, create an outdoor installation ‘filled with play, wonder and delight’, imagine a multifunctional exclusive/inclusive complex that serves client and community - some of the latest architecture contracts and competitions from across the industry

Latest: Bid for phase 1 rescue of Scotland’s first Palladian country house

A journey to Turkey for a summer wedding prompts the Purcell architect to consider aspects of place and time

Joining the dots to make sense of disruption

Emulating the patterns of natural light and our deeply embedded responses to it are central to lighting design, said experts at the RIBAJ/Occhio lighting event

Light and atmosphere are the key to making a magical place

A close collaboration between the architect and artist John Booth makes an imaginative and highly coloured exhibition relaying the history of Greenwich Peninsula

Up in Smoke reveals the enduring appeal of the chimney

International work by UK chartered architecture practices jumped by 43% last year, accounting for over a fifth of all revenue and providing a buffer against domestic market volatility

International work by UK chartered architecture practices jumped by 43% last year, reaching £170 million