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

Florian Roth, G.C. Lessa, C. Wild, R.K.P. Kikuchi, M.S. Naumann

Research output: Contribution to journalArticlepeer-review

17 Scopus citations

Abstract

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 δ13Corg and δ15N signatures and 4-fold increased BOD rates. Pollution effects of a sewage plume were detectable for more than 6 km 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.
Original languageEnglish (US)
Pages (from-to)43-48
Number of pages6
JournalMarine Pollution Bulletin
Volume106
Issue number1-2
DOIs
StatePublished - Apr 1 2016

ASJC Scopus subject areas

  • Oceanography
  • Pollution
  • Aquatic Science

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