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 Bulljournal_title
Marine pollution bulletinauthors
Kaminski HL,Fry B,Warnken J,Pitt KAdoi
10.1016/j.marpolbul.2018.05.020subject
Has Abstractpub_date
2018-08-01 00:00:00pages
233-239eissn
0025-326Xissn
1879-3363pii
S0025-326X(18)30327-8journal_volume
133pub_type
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