Alternativas para a cinza de casca de arroz: uma revisão

Abstract

On the American continent, Brazil is the largest rice producer, Rio Grande do Sul state is responsible for 70% of this production. In the production and processing of rice, among the residues generated, the husk is the most voluminous and corresponds to more than 23% of the weight of the grain. The rice husk burning process originates ash as a by-product and corresponds to 4% of the rice husk mass. The aim of the study was to review the literature of this rice husk ash (RHA) and alternatives for using this residue. The research was carried out through a bibliographic survey in the Google Academic, Web of Science and Scopus databases, being used in the last 22 years of research and as a search tool for terms: Rice husk ash; Characterization of RHA; Alternatives to an RHA; Rice Husk Ash and Rice Husk Ash Ash alternatives. From the review of 48 studies, the RHA constituents and contents and their main applications were surveyed. The main applications of RHA found were its use as a partial substitute for cement and mortar in building materials; in making glassware; as an adsorbent material in the removal of pollutants; addition to agricultural soils. RHS is a viable and easily accessible material. The importance and consumption of rice and its production, especially in southern Brazil, must also consider sustainable alternatives to its practice and management and alternatives to waste.