Conchas de ostras: fonte de insumos e indicador de contaminantes

Abstract

Aligned with the ideologies of sustainability and circular economy, this academic work aims to highlight the reuse of solid waste, which has abundant functional potential. Oysters are delicacies widely consumed on the southern Brazilian coast. This consumption generates the residue of the solid parts in significant volumes corresponding to the shells. The composition of this material is approximately 95% calcium carbonate, a substance largely used in industry, in the most varied production sectors. When oysters are consumed, the shells are discarded both in the domestic garbage generating accumulation of solid materials, and in the rivers or the beaches causing silting and other environmental impacts. There are many alternatives for the application of this residue that are described in this work. Exposing the characteristics of calcium carbonate coming from the extractive industry, examples will be demonstrate how apply the substitution of carbonate in the shells. The methodology for the treatment and manufacture of an additive powder from the shell is also exposed, showing processes of unitary operations and process parameters. Else the study shows experiments with sample digestion and AAS methodology to determine the concentrations of toxic components in this powder, confirming that the shells are indicators of the presence of contaminants in the animal's development local.