Main Title |
Alum Control of Internal Phosphorus Loading in a Shallow Lake. |
Author |
Welch, E. B. ;
Michaud, J. P. ;
Perkins, M. A. ;
|
CORP Author |
Washington Univ., Seattle. Dept. of Civil Engineering.;Corvallis Environmental Research Lab., OR. |
Year Published |
1982 |
Report Number |
EPA-R-804588; EPA-600/J-82-422; |
Stock Number |
PB84-153683 |
Additional Subjects |
Phosphorus ;
Lakes ;
Water pollution control ;
Aluminum sulfate ;
Alums ;
Cyanophyta ;
Recovery ;
Transparence ;
Clarity ;
Phytoplankton ;
Chlorophylls ;
Sampling ;
Biomass ;
Water quality ;
Washington(State) ;
Reprints ;
Organic loading ;
Trophic level
|
Holdings |
Library |
Call Number |
Additional Info |
Location |
Last Modified |
Checkout Status |
NTIS |
PB84-153683 |
Some EPA libraries have a fiche copy filed under the call number shown. |
|
07/26/2022 |
|
Collation |
11p |
Abstract |
Alum treatment of a shallow lake, with mean depth 2 m and area 137 ha, curtailed internal loading of P for at least one year. Mean summer total P and chl a decreased from 76 and 27 micrograms/l, respectively, in 1978 before treatment, to 29 and 14 micrograms/l, while mean summer Secchi transparency increased from 1.6 to 2.2 m and blue green algae were no longer dominant. Macrophyte biomass and distribution returned during the post-alum year, 1980-1981, to previous levels after a 1979 four-month lake level drawdown had reduced biomass by 84 percent. The improved transparency, resulting from the decrease in chl a following treatment, could encourage greater biomass of macrophytes in the deeper area of the lake. Recovery of macrophyte biomass to predrawdown levels may restore internal loading of P through enrichment of deep water sediments during winter dieback and decomposition. |
Availability Notes |
Pub. in Water Resources Bulletin, v18 n6 p929-936 1982. |
NTIS Title Notes |
Journal article. |
Title Annotations |
Reprint: Alum Control of Internal Phosphorus Loading in a Shallow Lake. |
PUB Date Free Form |
1982 |
Category Codes |
8H; 68D; 48G |
NTIS Prices |
Not available NTIS |
Document Type |
NT |
Cataloging Source |
NTIS/MT |
Control Number |
411842225 |
Origin |
NTIS |
Type |
CAT |