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Related Experiment Videos

Diffuse inputs of nutrients to Dublin Bay.

James G Wilson1

  • 1Zoology Department, TCD, Dublin 2, Ireland. jwilson@tcd.ie

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|April 27, 2005
PubMed
Summary

The River Liffey is Dublin Bay's primary nutrient source, contributing significant nitrogen and phosphorus. Upcoming wastewater treatment changes will alter nutrient speciation, impacting the bay's ecosystem.

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Area of Science:

  • Environmental Science
  • Marine Biology
  • Eutrophication Studies

Background:

  • The River Liffey is the principal source of diffuse nutrients entering Dublin Bay, comprising approximately 85% of all riverine inputs.
  • Riverine nutrient loads are substantial, with calculated inputs of 6601 kg Nitrogen (N) per day and 748 kg Phosphorus (P) per day.

Purpose of the Study:

  • To quantify nutrient inputs into Dublin Bay from the River Liffey and other sources.
  • To assess the impact of sewage discharge and sediment contributions on nutrient loads.
  • To anticipate the effects of a new Sewage Treatment Works (STW) on nutrient dynamics.

Main Methods:

  • Calculation of total nutrient loads (N and P) from riverine inputs.
  • Analysis of nutrient speciation, including dissolved inorganic nitrogen (DIN) and phosphate.
  • Consideration of contributions from sewage discharge, sediments, and nitrogen fixation.

Main Results:

  • The River Liffey contributes approximately 85% of riverine nutrient inputs to Dublin Bay.
  • Key nutrient forms include dissolved inorganic nitrogen (82% of N load) and phosphate (52% of P load).
  • Sewage discharge represents a significant additional nutrient load, comparable to riverine inputs.

Conclusions:

  • Riverine and sewage inputs are major drivers of nutrient levels in Dublin Bay.
  • Tidal exchange significantly influences nutrient concentrations, often exceeding direct inputs.
  • Anticipated changes in nutrient speciation due to the new STW may alter the dissolved/particulate nutrient balance in the bay.

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