Coast & Estuaries
Page 210
Table 40: Shows sludge outfall and seagrass loss at Port Adelaide and Glenelg Wastewater Treatment Plants
Sludge outfall (years discharging)
Seagrass loss
Port Adelaide WWTP sludge outfall
1978-1993 (=15 yrs)
Total seagrass loss = 365 ha (plus selective loss of
Amphibolis
)
Glenelg WWTP outfall No. 2:
1968-1983 (=15 yrs)
Total seagrass loss = 2 ha (plus selective loss of
Amphibolis
)
Water Quality Objectives (WQO)
The key performance indicators used to measure whether or not the defined WQ objectives are being achieved are:-
•
Reductions in total nitrogen (N) and total phosphorus (P) concentrations in samples collected for the ambient water quality
monitoring program of the Port waterways.
•
Appropriate reductions that meet EPA standards in both the collective nutrient loads and the nutrient loads discharged in each
of the three defined segments of the waterways.
•
Industrial inputs to the waterways that meet license conditions: – Penrice to reduce ammonia emissions to target levels or
lower – Bolivar WWTP to reduce total N and P loads in effluent discharged to Gulf St Vincent (Northern Barker Inlet).
•
No further mangrove decline, and evidence of mangrove recovery in areas experiencing die-back
•
Continued presence of a healthy population of dolphins
•
Reduced number and severity of phytoplankton blooms
•
Reductions in the extent and biomass of
Ulva
species.
