Uma revisão dos desenvolvimentos recentes na aplicação de pós-tratamentos ao digestato da digestão anaeróbia a partir de resíduos sólidos urbanos
Resumen
Anaerobic digestion is a consolidated process technology for managing
waste, with a large number of publications on this topic, due to its ability to
degrade organic solid waste and generate biogas as renewable energy. associated with
problem of waste generation we also have the emission of greenhouse gases, in which the
Methane gas is the second most abundant man-made greenhouse gas, and today the
third largest source of emission of this gas are the dumps, mainly of solid waste
urban. With the increasing evolution of anaerobic digestion in waste treatment, the
disposal and utilization of biogas waste (i.e. digestate) becomes a problem
prominent. To elucidate research and developments related to digestate treatment,
This work aims to present the current research scenario in the world facing the
post-treatments of digestate from the anaerobic digestion of municipal solid waste and
its possible applications as a valuable product. In addition, understanding the main aspects
and steps involved in the processes and possibility of use in Brazil. The platform of
Web of Science was used to select articles. 1632 publications were found in the
period from 2002 to 2022. The results indicated that the year 2021 had the highest number of
publications, with 313 articles and Italy and China were the countries that published the most, with 268 and
262 publications respectively. Among the articles selected as the most relevant, the
The most observed objective was the evaluation of post-treatments of the digestate for use as
fertilizer and other valuable products, and among them the treatments most applied to digestate
were filtration and centrifugation for the raw digestate, composting for the solid fraction of
digestate, with 38% of the works selected as relevant, and the filtration treatments
by membrane and ammonia stripping for liquid fraction of digestate with 12 and 11 publications
respectively. It was possible to conclude that an integrated approach to energy production
and waste recovery can be used, in which various value-added compounds
can be extracted during and after the anaerobic digestion process,
arriving at the concept of circular production.
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