Impacts of a high-discharge submarine sewage outfall on water quality in the coastal zone of Salvador (Bahia, Brazil).

Autor: Roth F; Coral Reef Ecology Group, Leibniz Center for Tropical Marine Ecology (ZMT), 28359 Bremen, Germany; Faculty of Biology and Chemistry, University of Bremen, 28369 Bremen, Germany; King Abdullah University of Science and Technology (KAUST), Red Sea Research Center, Thuwal 23955-6900, Saudi Arabia. Electronic address: florian.roth@uni-bremen.de., Lessa GC; Department of Oceanography, Institute of Geosciences, Federal University of Bahia (UFBA), 40170-110 Salvador, Bahia, Brazil. Electronic address: gclessa@gmail.com., Wild C; Coral Reef Ecology Group, Leibniz Center for Tropical Marine Ecology (ZMT), 28359 Bremen, Germany; Faculty of Biology and Chemistry, University of Bremen, 28369 Bremen, Germany. Electronic address: christian.wild@uni-bremen.de., Kikuchi RK; Coral Reef and Global Changes Research Group (RECOR), Department of Oceanography, Institute of Geosciences, Federal University of Bahia (UFBA), 40170-110 Salvador, Bahia, Brazil. Electronic address: kikuchi@ufba.br., Naumann MS; Coral Reef Ecology Group, Leibniz Center for Tropical Marine Ecology (ZMT), 28359 Bremen, Germany. Electronic address: mnaumann@uni-bremen.de.
Jazyk: angličtina
Zdroj: Marine pollution bulletin [Mar Pollut Bull] 2016 May 15; Vol. 106 (1-2), pp. 43-8. Date of Electronic Publication: 2016 Mar 30.
DOI: 10.1016/j.marpolbul.2016.03.048
Abstrakt: Carbon and nitrogen stable isotopic signatures of suspended particulate organic matter and seawater biological oxygen demand (BOD) were measured along a coastal transect during summer 2015 to investigate pollution impacts of a high-discharge submarine sewage outfall close to Salvador, Brazil. Impacts of untreated sewage discharge were evident at the outfall site by depleted δ(13)Corg and δ(15)N signatures and 4-fold increased BOD rates. Pollution effects of a sewage plume were detectable for more than 6km downstream from the outfall site, as seasonal wind- and tide-driven shelf hydrodynamics facilitated its advective transport into near-shore waters. There, sewage pollution was detectable at recreational beaches by depleted stable isotope signatures and elevated BOD rates at high tides, suggesting high bacterial activity and increased infection risk by human pathogens. These findings indicate the urgent necessity for appropriate wastewater treatment in Salvador to achieve acceptable standards for released effluents and coastal zone water quality.
(Copyright © 2016 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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