Wastewater treatment is an important function of society and one that confronts many challenges. The collaboration project, “The warm and clean city” an ongoing project in Lund, southern Sweden, is aiming at changing the view of wastewater, by creating new innovative solutions in regards to wastewater treatment. The solutions are resource-efficient and facilitate utilizing substances in the wastewater for generating saleable products while at the same time closing the water and nutrient loops. An important part of the waste disposal process is about using the amazing capabilities of microalgae.
Heliospectra delivers intelligent controllable LED lighting solutions, giving growers and researchers almost infinite spectrum possibilities. Making it ideal for when it comes to testing different light recipes for optimized microalgae growth. With optimum light, microalgae can thrive, grow, and in massive proportions eat much of the not so active content in wastewater - a context in were most ordinary plants or macroalgae would have died.
Submersed in a glass tube, the lights are doing their job inside a custom made wastewater treatment photobioreactor. Once a week the nutrient reduction in the wastewater is measured as well as the amount of algae after harvest (susp.). Heliospectra´s highly controllable LED light raise possibilities to keep the light as a controlled factor in the photobioreactor, making the microalgae grow rapidly, and when refined become a resource such as biofuel/gas.
Transforming wastewater into an algae stew has many advantages. The wastewater could once again be transferred back into the society’s system, tightening the loop of recycling, and help decreasing nutrients leak to our valuable nature, causing overfeeding of our oceans and lakes with the result of algae blooms and stinking beaches.
In addition to Lund Municipality, Heliospectra, and SLU, the project includes the European Spallation Source (ESS), Lund University’s Faculty of Engineering (LTH), as well as such companies as Alfa Laval, AnoxKaldnes, BioMil, Lunds Energi Group and Purac.
This is a video about the project.