Akademik Veri Yönetim Sistemi
6th EurAsia Waste Management Symposium (EWMS), İstanbul, Türkiye, 24 - 26 Ekim 2022, ss.665-672
In recent years, biomineralization, microbial-induced calcium carbonate precipitation (MICP), appeared as an environmentally friendly process for minimizing waste generation, valorizing waste materials, and recovering resources such as development of microbial self-healing concrete, improvement of construction and demolition wastes, and metals recovery from waste electrical and electronic equipment (WEEE). Most of the MICP studies were conducted by using only pure (axenic) cultures, and biomineralization performances were only achieved through a single metabolism. However, MICP yield can be improved if two metabolic pathways: (i) urea hydrolysis, ( ii) nitrate reduction are utilized. In this study, we focused on the production of biogranules and comparison of biogranules with two axenic cultures (Sporosarcina pasteurii DSM 33, Pseudomonas aeruginosa) in terms of microbial activity and biomineralization performance. As a result, the specific CaCO3 precipitation activities of dried biogranules, dried Sporosarcina pasteurii DSM 33 and dried Pseudomonas aeruginosa were calculated as 1.42 g CaCO3.day(-1).g(-1) CDW, 0.45 g CaCO3.day(-1).g(-1) CDW, and 0.19 g CaCO3.day(-1).g(-1) CDW, respectively. The specific CaCO3 precipitation activities of wet biogranules, wet S. pasteurii and wet P. aeruginosa were calculated as 1.5 g CaCO3.day(-1).g(-1) CDW, 0.29 g CaCO3.day(-1).g(-1) CDW, and 0.34 g CaCO3.day(-1).g(-1) CDW, respectively. Furthermore, it was revealed that biogranules can simultaneously perform urea hydrolysis and nitrate reduction which is promising to enhance the MICP yield and surpass the performances of axenic cultures with single metabolic pathway. Overall, these biogranules with enhanced MICP performance can be used to improve recycled aggregates, to develop microbial self-healing concrete or to recover precious metals from the WEEE.