How algae could sustainably reduce the carbon dioxide concentration in the atmosphere

How algae could sustainably reduce the carbon dioxide concentration in the atmosphere
A beam made of carbon fiber reinforced granite is load-bearing like steel, light as aluminum and extremely durable. Credit: Kolja Kuse / TechnoCarbonTechnologies

In collaboration with fellow researchers, chemists at the Technical University of Munich (TUM) have developed a process that, according to initial calculations, can facilitate economically removing the greenhouse gas carbon dioxide from the atmosphere. The latest World Climate Report (IPCC Special Report on Global Warming of 1.5 ° C) acknowledges the global relevance of the process.

There is an acute need for action if global warming is to be mitigated to a reasonable extent. In this context, the current World Climate Report winks at a technology developed by chemists at the Technical University of Munich. Opening an option for a net sink, the technology tackles the problem of atmospheric warming at the root.

Algae convert from the atmosphere, power plants or steel processing exhaust into algae oil. In a subsequent step, this is then used to produce valuable carbon fibers – economically, as initial analyses show.

A climate-neutral process

Important technical groundwork was done by Professor Thomas Brück and his team at the Algae Cultivation Center of the Technical University of Munich. The algae investigated at the center not only produce biofuel, but can also be used to efficiently produce polyacrylonitrile (PAN) fibers. The energy of parabolic solar reflectors then chars the PAN-fibers to yield carbon fibers in a CO2-neutral manner.

Carbon fibers can be deployed to produce lightweight and high-strength materials that. At the end of their life cycle, the can be stockpiled in empty coal seams, permanently removing the associated carbon dioxide equivalents from the atmosphere.

How algae could sustainably reduce the carbon dioxide concentration in the atmosphere
French President Emmanuel Macron at the UN Climate Change Conference 2017 in Bonn with the sample of a carbon fiber reinforced granite carrier. Credit: Stephan Savarese / TechnoCarbonTechnologies France

A climate-friendly economic model

Brück's colleague Prof. Uwe Arnold and Dipl.-Ing. Kolja Kuse also examined the economic aspects, technical applications and environmental impact of the entire process. "This is a novel, climate-friendly economic model in which we intelligently combine standard processes with innovations," says Arnold.

"When you make plastics from carbon dioxide, it is quickly returned to the atmosphere through waste incineration plants following a few years of use," says Kuse. "With the final safe storage, we remove the carbon dioxide from the atmosphere for millennia. This also makes the clearly superior to carbon capture and storage (CCS) in the underground."

Carbon fibers from algae are no different from conventional fibers and can therefore be used in all existing processes. Another important field of application could be the construction industry, which accounts for a significant proportion of global carbon dioxide emissions.

Carbon fibers can replace structural steel in construction materials. Thanks to their strength, they save on cement, and granite reinforced with carbon fiber can even be used to produce beams that have the same load-bearing capacity as steel but are as lightweight as aluminum.

How algae could sustainably reduce the carbon dioxide concentration in the atmosphere
TUM’s AlgaeTec facility at Ludwig Bölkow Campus, south of Munich. Credit: Andreas Heddergott / TUM

Algae farms the size of algeria

Brück now plans to further improve the algae technology. Large-scale plants are conceivable in southern Europe and North Africa. "The system is easily scalable to large areas," says Brück. "Plants which together would cover the size of Algeria would offset all CO2 emissions from air transport."

Brück rejects any suggestion that the technology would compete with the agricultural use of land, as is the case with biogas. "Saltwater thrive in sunny areas. In North Africa, for example, there are ample stretches of land where agriculture makes no sense."

Explore further

As climate changes, plants might not suck carbon from the air fast enough

More information: Uwe Arnold et al. Carbon Capture and Sustainable Utilization by Algal Polyacrylonitrile Fiber Production: Process Design, Techno-Economic Analysis, and Climate Related Aspects, Industrial & Engineering Chemistry Research (2018). DOI: 10.1021/acs.iecr.7b04828

Uwe Arnold et al. Energy-Efficient Carbon Fiber Production with Concentrated Solar Power: Process Design and Techno-economic Analysis, Industrial & Engineering Chemistry Research (2018). DOI: 10.1021/acs.iecr.7b04841

IPCC Special Report on Global Warming of 1.5°C, Chapter 4: Strengthening and implementing the global response;

Provided by Technical University of Munich
Citation: How algae could sustainably reduce the carbon dioxide concentration in the atmosphere (2018, November 15) retrieved 18 June 2021 from
This document is subject to copyright. Apart from any fair dealing for the purpose of private study or research, no part may be reproduced without the written permission. The content is provided for information purposes only.

Feedback to editors

User comments