Abstract
In the rapidly growing coastal megacities of developing and emerging countries, the implementation of new sewage treatment facilities is often not keeping pace with the enormous population growth, leading to a deterioration of the urban water resources. Only very few studies discuss faecal water contamination in these urban areas. Our study area Jakarta, the capital of Indonesia, is such a megacity. We investigated chemical markers of faecal contamination in water and sediments from the rivers and canals flowing through Jakarta. Moreover, also the spatial distribution of faecal markers in Jakarta Bay, the coastal ecosystem that receives all urban river discharges, was assessed. The concentrations of the faecal steroid coprostanol in river water ranged from 0.45 to 24.2 µg L−1, and in sediments from 0.3 to 400 µg g−1, reflecting the problem of inadequate sewage treatment capacities in the city. The steroid distribution in Jakarta Bay in May 2013 as compared to dry season data indicates a flushing out of particle-associated pollutants from the urban rivers far offshore during the precedent rainy season, where the city experienced a severe flood. This flushing out of particle-associated pollutants during times of heavy rainfall as observed in our study is a pollutant transport mechanism that is important for all tropical coastal systems. The associated impacts on sensitive coastal habitats might become more severe in the future, as a consequence of the expected climate change effects on monsoon variability.
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Acknowledgements
This study is part of the Indonesian-German SPICE Program (Science for the Protection of Indonesian Coastal Marine Ecosystems), funded by the BMBF (Grant 03F0641E) and supported institutionally by BBP4BKP.
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Dsikowitzky, L., Schäfer, L., Dwiyitno et al. Evidence of massive river pollution in the tropical megacity Jakarta as indicated by faecal steroid occurrence and the seasonal flushing out into the coastal ecosystem. Environ Chem Lett 15, 703–708 (2017). https://doi.org/10.1007/s10311-017-0641-3
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DOI: https://doi.org/10.1007/s10311-017-0641-3