IMPACTS OF SEWAGE SLUDGES DEPOSITION ON AGRICULTURAL SOILS: EFFECTS UPON MODEL SOIL ORGANISMS
Author(s): Urionabarrenetxea E; Garcia-Velasco N; Zaldibar B; Soto M;
Presenter: Manu Soto
During years sewage sludges have been poured in agricultural soils worldwide to enhance vegetal production. The “Landfill 17” located in Gernika-Lumo town (43°19'28.9"N 2°40'30.9"W) received for decades sewage sludges from the Waste Water Treatment Plant (WWTP) with agricultural purposes. Thus, several pollutants from local industry such as heavy metals (Cd, Cr, Ni, Pb), PAHs (benzo(a)pyrene among many others) and pesticides (i.e. dieldrin) were widespread all over the landfill. Among the most affected species, soil invertebrates like earthworms and plants must be highlighted; specially due to their close contact with the polluted matrix. In this context, the aim of the present work was to determine the health status of landfill soils by evaluating the effects on model soil organisms exerted by long-lasted presence of pollutants after on site deposition of WWTP active sludges. With such a purpose, different standard toxicity tests and cellular level endpoints were performed on earthworms and lettuce. Indeed, OECD acute toxicity test (OECD-204), reproduction test (OECD-222) and Calcein-AM viability test with coelomocytes were applied in Eisenia fetida worms; while germination and root elongation tests were carried out in Lactuca sativa. For the exposure, soils collected in the landfield containing low (L), medium (M) and high (H) concentrations of pollutants were selected, and as reference LUFA 2.3 natural standard soil was chosen. Results showed significant differences between experimental groups and control group; being measured lower coelomocyte number and viability, tissue metal accumulation, severe weight losses and reproductive impairments in experimental groups. These results confirmed the chronic impact of contaminants to soil biota after sewage sludges deposition.
Financial Support: Basque Gov (IT810-13; ITO18-16), CTM2017-87766-R, AGL 2015-64481-C2-1-R and AGL2016-76592-R from MINECO, PhytoSUDOE-SOE1/P5/E0189.
Keywords: sewage sludges; biomarkers ; standard toxicity tests
Graduada em Ciências Biológicas pela Universidade Federal de São Carlos (1985) com mestrado em Ciências (Fisiologia Geral) pela Universidade de São Paulo (1990). Realizou o doutorado no Departamento de Fisiologia Geral do IBUSP e no Departamento de Zoologia da Universidade de Leicester, Inglaterra e...Saiba mais
2000-Present Professor Aquatic Ecotoxicology, University of California, Riverside, CA USA
1995-1999 Associate Professor Pharmacology and Environmental Toxicology, University of Mississippi, MS USA
1991-1995 Assistant professor Pharmacology and Toxicology, University of Arkansas for Medi...
Gisela de Aragão Umbuzeiro is a full professor at School of Technology – UNICAMP, Brazil and an adjunct professor at Wilson College of Textiles, NCSU, USA. She graduated in Biology at University of Campinas - UNICAMP (1979), Ph.D. in Genetics also at UNICAMP (1990). Worked for 22 years at the Enviro...Saiba mais
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