Kangaroo Rat Burrow Biofilms to Improve Soil Stability
Kangaroo rats (Dipodomys deserti) construct complex burrow systems in loose desert sand that remain stable under extreme environmental conditions due to the cementation effects of biofilms. Burrow biofilms, through their extracellular polymeric substances and filamentous structures bind sand particles together and increase soil mechanical strength. Utilizing biofilm formations for soil improvement presents an environmentally sustainable alternative to the traditional methods that rely on cement and chemical additives. Understanding the mechanisms behind the natural biocementation process in kangaroo rat burrows can inspire bioengineered solutions for improving sandy soils in geotechnical applications. The overall goal of the proposed research is to investigate the mechanisms behind biofilm-induced cementation in kangaroo rat burrows. Specifically, this study will 1) characterize microbial communities in burrow biofilms and assess the influence of kangaroo rat activities on the burrow microbiome, (2) identify microbial species responsible for biofilm induced cementation, and evaluate their potential contributions to burrow soil mechanical strength. Collectively, the proposed research will provide a comprehensive understanding of biofilm-induced cementation, drawing inspiration from naturally occurring biocementation processes and translating these insights into practical applications for soil improvement in engineering.
My name is Duygu Aydin. I am a Ph.D. candidate in Chemical Engineering at Washington State University. I earned my undergraduate degree in Chemical Engineering from Hacettepe University in Turkey. My doctoral research focuses on biofilm engineering as a sustainable alternative to cement for soil improvement, inspired by the naturally stable burrows of kangaroo rats. I study the micro-mechanical properties of biofilms to strategically utilize them for enhancing soil strength and durability.