Nutrient removal and loading rate analysis of Louisiana forested wetlands assimilating treated municipal effluent.
The relationship between nutrient removal and loading rate was examined using data from five forested wetlands in Louisiana that have received secondarily treated effluent from 3 to 60 years. Loading rates ranged from 0.65 to 26.80 g/m(2)/yr for total nitrogen and 0.18 to 8.96 g/m(2)/yr for total phosphorus. At loading rates below 20 g/m(2)/yr, total nitrogen concentrations in surface waters of Louisiana forested wetlands were reduced to background concentrations (i.e., < or =3 mg/l). Similarly, at loading rates below 2 g/m(2)/yr, total phosphorus concentrations were also generally reduced to background concentrations (i.e., < or =1 mg/l). These data demonstrate that freshwater forested wetlands can reduce nutrient concentrations in treated effluent to background concentrations present in relatively undisturbed wetlands. An understanding of the relationship between loading rates and nutrient removal in natural wetlands is important, particularly in Louisiana where discharges of fresh water are being used in ecosystem restoration.
Hunter
Rachael
R
School of the Coast and Environment, Louisiana State University, Baton Rouge, LA 70803, USA. rhunter@lsu.edu
Lane
Robert
R
Day
John
J
Lindsey
Joel
J
Day
Jason
J
Hunter
Montgomery
M
D008145:Louisiana; D009584:Nitrogen / Q000032:analysis*; D010758:Phosphorus / Q000032:analysis*; D012722:Sewage; D014197:Trees; D018505:Waste Management; D014867:Water / Q000032:analysis*; D053833:Wetlands
D012722:Sewage; D014867:Water; D010758:Phosphorus; D009584:Nitrogen
Water Res. 2003 Nov;37(18):4468-74
14511717
Biotechnol Adv. 2003 Dec;22(1-2):135-59
14623048
Science. 1974 Oct 4;186(4158):53-5
17818101
Environ Manage. 1998 Jan;22(1):119-27
9419290