The new process converts CO2 into fuel alcohol, proteins for animal feed and fertiliser for agricultural purposes, by feeding the CO2 to algae and transforming the algae to alcohol by fermentation and the residual bio matter to fertiliser. The exhausted yeast cells are then spray dried into protein powder for animal feed.
The principle is simple, however the process implementation is difficult due to the very large installations and large mass flows involved. GEA does, however, have the necessary core competence and correct organisation to handle projects of this magnitude.
CO2 is scrubbed from processes with high CO2 concentrations such as rotary ovens of cement plants. The CO2 is then introduced to basins that contain large volumes of algae which consume the CO2 gas. As algaes are polysaccharides containing fermentable sugars, these are easily converted to alcohol through fermentation. The alcohol can then be recovered for use as fuel, leaving the remaining algae bio mass and yeast cream for drying into useful fertiliser and animal feed respectively.
The process will be ideal for industries with a large carbon dioxide footprint that are interested in savings from CO2 reduction of production processes. These savings can be significant especially as the worldwide tightening of penalties for discharging greenhouse gasses to the environment becomes increasingly severe.
The payback period for such a CO2-transformation installation is, as yet, uncertain. The return on investment is determined largely by the tax rates and other penalties governments impose on CO2 emissions. Robert Djernaes, food sales group manager of GEA Niro, is in no doubt that the cost savings will be significant.
“The payback time on a process like this depends largely on how much the plant is paying in emissions taxes and to a lesser extent on the sales price of the produced fertiliser, alcohol and protein for animal feed,” he said. “Ultimately, reducing the cost for the plant will reduce the cost for the client and therefore the product’s consumer.”
The process is experimental. Currently, there are extended tests running in Spain for growing algaes in connection with a cement plant. Preliminary analysis suggests that it’s a successful process for reducing CO2 emissions.
Source: GEA Niro
© FoodBev Media Ltd 2020
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