Author(s):
Mazzeo, Dânia Elisa Christofoletti [UNESP] ; Misovic, Andrea ; Oliveira, Flávio Andrade ; Levy, Carlos Emílio ; Oehlmann, Jörg ; de Marchi, Mary Rosa Rodrigues [UNESP]
Date: 2020
Persistent ID: http://hdl.handle.net/11449/200979
Origin: Oasisbr
Subject(s): Enterobacteria; Microtox; Oxidative stress; Phytotoxicity; Sludge stabilization; Solid waste; Enterobacteria; Enterobacteria; Microtox; Microtox; Oxidative stress; Oxidative stress; Phytotoxicity; Phytotoxicity; Sludge stabilization; Sludge stabilization; Solid waste; Solid waste
Description
Made available in DSpace on 2020-12-12T02:21:05Z (GMT). No. of bitstreams: 0 Previous issue date: 2020-12-01
Sewage sludge (SS) exhibits a relevant agronomic potential due to the high content of organic matter and nutrients. However, the presence of several toxic substances can prevent its agricultural application. This study evaluated if the incorporation of stimulating agents (coffee grounds and sugarcane bagasse) could contribute to an effective increase of the SS biodegradability in order to decrease its toxicity. The samples were prepared mixing aerobic or anaerobic sludge with soil, soil and bagasse, and soil and coffee grounds. Respirometric tests showed that stimulating agents enhanced the CO2 production. However, in terms of biodegradation efficiency, more satisfactory results were verified for the anaerobic SS, especially when mixed with coffee grounds. The biodegradation also favored the SS sanitization, eliminating the Enterobacteria. For baseline toxicity (Microtox with Aliivibrio fischeri) and phytotoxicity (Lactuca sativa), all the initial samples showed higher effects. Nevertheless, after the biodegradation, this toxicity was significantly decreased and the best results were obtained for the mixtures containing only soil and sludge. For the AREc32 assay (NRF2 mediated oxidative stress response), although a very weak response was observed, this effect was attenuated for the aerobic SS or completely eliminated for the anaerobic SS after the biodegradation. Thus, even though the use of biostimulation agents during the biodegradation led to an enhancement of microbial respiration, their incorporation to the samples do not seem to interfere in the decrease of the toxic potential of the studied SSs. However, the SS biodegradation in aerobiosis was crucial for toxicity reduction and to accelerate its maturity.
Department of Analytical Chemistry Institute of Chemistry Universidade Estadual Paulista – UNESP
Department Aquatic Ecotoxicology Faculty of Biological Sciences Goethe University Frankfurt am Main
Department of Clinical Pathology Faculty of Medical Sciences State University of Campinas – UNICAMP
Department of Analytical Chemistry Institute of Chemistry Universidade Estadual Paulista – UNESP
