Title: Bioindicators assessing water quality and environmental impacts of water treatment plant sludge

Authors: Talitha R. Alves Abreu Da Costa; Olmar Baller Weber; Carlos J. Pestana; José Capelo-Neto

Addresses: Department of Hydraulic and Environmental Engineering, Federal University of Ceará, 713. Fortaleza, Ceará, 60451-970, Brazil ' Embrapa-Brazilian Agricultural Research Corporation, Dra. Sara Mesquita St., 2270, Fortaleza, Ceará, 60511-110, Brazil ' School of Pharmacy and Life Science, Robert Gordon University, Garthdee House, Garthdee Road, Aberdeen AB10 7QB, UK ' Department of Hydraulic and Environmental Engineering, Federal University of Ceará, 713. Fortaleza, Ceará, 60451-970, Brazil

Abstract: This study had as objectives to assess water quality using macroinvertebrate communities in Gaviao artificial reservoir (Brazil), used to supply potable water to 2.5 million people, and to evaluate how these organisms responded to the discharge of water treatment sludge into a natural wetland. A total of 1,621 specimens across 23 taxa were identified. Mollusca were the dominant and most frequent group while Insecta presented the most richness. Based on feeding mode, there were more predator organisms than scrapers. The Biological Monitoring Working Party (BMWP') method showed to be more sensible to water quality variations than ASPT index, going from polluted to questionable water quality more frequently. The chemical parameters analysed showed no significant variations and were not a sensitive method for assessing water quality. No organisms could be found downstream of the sludge discharge point, indicating a high impact of sludge disposal on local biota.

Keywords: macroinvertebrates; bioindicators; artificial reservoirs; water quality; water treatment sludge; environmental impact; potable water; drinking water; natural wetlands; water pollution; Brazil.

DOI: 10.1504/IJESD.2017.080837

International Journal of Environment and Sustainable Development, 2017 Vol.16 No.1, pp.25 - 42

Available online: 18 Nov 2016 *

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