Ecological risk assessment of a subtropical river influenced by discharges of residues from water and sewage treatment plants
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2017
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Management of Environmental Quality: An International Journal
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Purpose – The São Lourenço River (SLR) is used to supply potable waters for the cities of São Lourenço
da Serra and Juquitiba, but receives the residues from the water treatment plants (WTPs) and sewage treatment
plants (STPs), respectively. The purpose of this paper is to evaluate the impacts of the discharges of Juquitiba’s
WTP and STP on the quality of the SLR, by using an integrated approach based on different lines of evidence.
Design/methodology/approach – Six sampling sites were established along the river and comprised areas
situated upstream and downstream of the discharges. Five sampling surveys were performed between 2004
and 2006 for collecting water and sediment samples for ecotoxicological assays. In two of these campaigns,
benthic community structure and geochemistry (metals, nutrients and sediment texture) were also assessed.
Findings – Concentrations of P, Fe and Al in waters exceeded the national standards, but sediments were not
considered to be contaminated by metals or nutrients. Water and sediments tended to exhibit marginal
toxicities, excluding the sediments from JQT007 and JQT008 that were frequently toxic. Combination of
geochemistry, toxicity and ecological indices indicated that some sites are not degraded, but in some stations
the benthic alteration may be due to non-measured contaminants, especially in JQT007 and JQT008.
Practical implications – As the use of waters from SLR for public supply has increased, these results show
that action should be taken in order to reverse the environmental degradation of SRL.
Originality/value – This research combined sediment and water quality assessments in order to provide a
more suitable and reliable diagnostic of the environmental quality of the SLR.
Como referenciar
SILVA, ANGELICA M.; ABESSA, DENIS; PAMPLIN, PAULO A.Z.; BOHRER-MOREL, MARIA B. Ecological risk assessment of a subtropical river influenced by discharges of residues from water and sewage treatment plants. Management of Environmental Quality: An International Journal, v. 28, n. 2, p. 156-174, 2017. DOI: 10.1108/MEQ-09-2015-0169. Disponível em: http://repositorio.ipen.br/handle/123456789/27874. Acesso em: 26 Apr 2024.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.