Stable isotopes demonstrate the effectiveness of a tidally-staged sewage release system.

Abstract:

:Nutrient loading from sewage wastewater discharge contributes to the eutrophication of coastal waters. Wastewater from the Gold Coast, Australia is discharged into the Gold Coast Seaway (GCS) for 13.5 h d-1 primarily on the ebbing tide to disperse wastewater seawards. Nitrogen stable isotopes were used to assess how effectively the tidally staged release system dispersed wastewater out of the GCS and identified pathways by which sewage-N was incorporated into food webs. Turf algae, limpets and barnacles were sampled at the GCS, at two coastal sites and at the mouth of a control estuary that lacked point-source discharge. In the GCS δ15N values of algae and limpets returned to coastal baseline levels within 250 m of the diffusers. In contrast, δ15N of filter-feeding barnacles did not significantly vary indicating wastewater-N does not dominate the pelagic food web. Nitrogen stable isotopes clearly demonstrated that the tidally-staged wastewater release system effectively disperses wastewater offshore.

journal_name

Mar Pollut Bull

authors

Kaminski HL,Fry B,Warnken J,Pitt KA

doi

10.1016/j.marpolbul.2018.05.020

subject

Has Abstract

pub_date

2018-08-01 00:00:00

pages

233-239

eissn

0025-326X

issn

1879-3363

pii

S0025-326X(18)30327-8

journal_volume

133

pub_type

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