SYSTEMATIC APPROACH FOR GAPS IDENTIFICATION IN TREATMENT OF LANDFILL LEACHATE BY HETEROGENEOUS FENTON AND PHOTO-FENTON PROCESSES

Abstract

The study aimed to determine the state of the art regarding the application of heterogeneous Fenton and photo-Fenton processes in the treatment of landfill leachate. For this, the ProKnow-C (Knowledge Development Process - Constructivist) method was used to guide the selection of a bibliographic portfolio (BP) about the topic and to perform the bibliometric and systematic analyzes of the BP, considering the publications in the period of 2015 to 2020. After the systematic filtering stages of articles, the final BP was constituded by 8 articles. Through bibliometric analyzes, it was found that the country and the year with the largest number of publications were India and 2018. The systematic analysis of the articles was developed based on three lenses and the gaps identified were related to: i) the lack of studies that contemplated simultaneous variations of the interfering variables (pH, hydrogen peroxide and catalyst dosages) in the process; ii) the need to investigate further the changes in the Dissolved Organic Matter (DOM) of the leachate after the application of the processes, as well as the removal of emerging contaminants; and iii) the need for studies related to the separation capacity between the catalysts and the treated leachate, in the reactive reusability cycles, at different scales of investigation.