Eficiência de remoção de demanda química de oxigênio de efluentes industriais por sistema de lodos ativados e suas variantes: uma revisão sistemática

Abstract

Industrial effluents must be treated appropriately to remove pollutants, minimize damage to the environment and protect public health. Thus, the objective of the current project was to identify the efficiency of removing chemical oxygen demand in industrial effluents by activated sludge systems and their variants, through a systematic review. The research was carried out in the Scopus and ScienceDirect databases and independently, two researchers selected the studies, from the period 2016 to 2020, and extracted the data to be analyzed. It was obtained that of 1676 documents analyzed, 25 were included in the study due to the eligibility criteria. As a result, in relation to the studies included, the countries that carried out the most studies on the theme, in the period from 2016 to 2020, were Brazil, China and Turkey, with 3 studies each. The industry segment with the highest frequency in the included studies was food. Industrial effluents showed a large variation in the initial COD, which did not allow the correlation of the effluent typology with treatment biotechnology. 41% of the included studies had COD removal between 91-100%, with MBR and its variants and / or post-treatments being the most present biotechnology in this range, thus becoming a highly relevant biotechnology in the treatment of effluents industrial. Therefore, through the developed systematic review, it was possible to present the efficiency of removing chemical oxygen demand in industrial effluents by activated sludge systems and their variants.