Abstract
This work aim to study the impacts caused by the disposal of residues from two tanneries localized in the municipalities of Cuiabá and Várzea Grande in Mato Grosso State, particularly on groundwater. In one of the tanneries (tannery 1), the final residue disposal was done over an impermeable blanket inside a trench covered with amianthus tiles while in the other (tannery 2) the residues were disposed directly on the soil covered with the impermeable blanket. To achieve this objective, physical chemical and chemical properties which could indicate alteration of groundwater quality in the areas of final disposal of tannery residues were determined. Groundwater samples were collected in monitoring wells built in those areas. The analysis of the physical chemical and chemical variables allowed the following conclusions: i) the residues disposal in tannery 1 contributed to increase chromium concentrations, pH; electrical conductivity and also total dissolved solids; ii) the residues disposal in tannery 2, contributed to increase the concentrations of chloride, electrical conductivity and as a consequence total dissolved solids. Although the two tanneries are at work for different times (tannery 1 from 2000 and tannery 2 from 1986) using different residues disposal procedures, no significant difference were observed in the alteration of groundwater quality in the two sites.
Highlights
1 from 2000 and tannery 2 from 1986) using different residues disposal procedures, no significant difference were observed in the alteration of groundwater quality in the two sites
study the impacts caused by the disposal of residues
from two tanneries localized in the municipalities of Cuiabá
Summary
No processo produtivo do curtume, que consiste em transformar a pele do animal em couro, as mesmas são submetidas à ação de diferentes agentes químicos que interagem com as fibras para a obtenção de um couro estável e durável. Alguns desses componentes são nutrientes para as plantas, como nitrogênio, fósforo, potássio, enxofre, cálcio e magnésio (SELBACH et al, 1991). É interessante citar dois trabalhos realizados na Índia que estudam contaminação das águas subterrâneas por resíduos de curtume (MONDAL et al, 2005 e ZAHID et al, 2006). Aqui no estado de Mato Grosso podemos citar Lannes (2002); Vogado; Migliorini (2005 e 2006); Costa; Migliorini (2005), Cunha (2005) e Fachin et al (2006), estudaram as águas subterrâneas no entorno das trincheiras de deposição de resíduos de tratamento de curtume, localizados nos municípios de Cuiabá e Várzea Grande/MT. Todos os trabalhos citados tanto na Índia quanto em Mato Grosso concluíram que houve alteração das águas subterrâneas através da variação da concentração dos constituintes físicos, químicos e alguns elementos traços. A seguir são citadas as litofácies ou conjuntos litológicos, que correspondem o Grupo Cuiabá (MIGLIORINI, 1999)
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