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Algal biofilm façades are an alternative to traditional green façades which can help to improve biodiversity and air quality within cities. They present a low maintenance approach in which subaerial algae are grown directly on concrete substrates. The intrinsic bioreceptivity of the substrate is a critical factor in successful facade colonisation. Existing research has identified several environmental and material properties which influence concrete bioreceptivity, however a consensus has yet to be made on which properties are most influential and how the interaction between properties may promote algal biofilm growth under specific conditions.
Elevated temperatures and high levels of air pollution in urban environments pose a significant threat to the health and life quality of inhabitants of these areas. This research aims to address these challenges by developing green façade systems using micro-algal biofilms. Both material and biological properties are assessed to optimise biofilm performance and durability. Cementitious samples with different pH levels and varying nutrient compositions are tested in combination with model microorganisms. Organism growth, health and adhesion are monitored over a 3-month period under controlled laboratory conditions.
Bioreceptive concrete surfaces: Understanding material-biology interactions for façade greening
(2024)
The climate crisis has led to a growing demand for environmentally oriented approaches in the construction industry, including not only eco-friendly materials, but also the greening of urban spaces. Microbial facade greening with algae is a novel concept based on the inherent bioreceptive properties of different building materials. This study focuses on the influence of physical material properties on biofilm formation. Differently textured samples from the same UHPC mix were produced and their roughness and water absorption documented. The samples were then weathered under laboratory conditions to observe material-algae interactions.
Bioreceptive Concrete Surfaces: Understanding Material-Biology Interactions for Façade Greening
(2024)
The climate crisis has led to a growing demand for environmentally oriented approaches in the construction industry, including not only eco-friendly materials, but also the greening of urban spaces. Microbial facade greening with algae is a novel concept based on the inherent bioreceptive properties of different building materials. This study focuses on the influence of physical material properties on biofilm formation. Differently textured samples from the same UHPC mix were produced and their roughness and water absorption documented. The samples were then weathered under laboratory conditions to observe material-algae interactions.