Migrations of haemoglobin-rich Daphnia longispina in a small, steeply stratified, humic lake with an anoxic hypolimnion

Hydrobiologia ◽  
1992 ◽  
Vol 229 (1) ◽  
pp. 271-288 ◽  
Author(s):  
Kalevi Salonen ◽  
Anja Lehtovaara
Keyword(s):  
Humic Lake ◽  
Daphnia Longispina ◽  
Anoxic Hypolimnion

scholarly journals Methane-oxidizing and photoautotrophic bacteria are major producers in a humic lake with a large anoxic hypolimnion

2011 ◽  
Vol 64 (1) ◽  
pp. 81-95 ◽  
Author(s):  
S Taipale ◽  
P Kankaala ◽  
MW Hahn ◽  
RI Jones ◽  
M Tiirola
Keyword(s):  
Humic Lake ◽  
Anoxic Hypolimnion

Evaluating ozone dose for AOC removal in two-step GAC filters

1998 ◽  
Vol 37 (9) ◽  
pp. 113-120 ◽  
Author(s):  
R. Vahala ◽  
T. Ala-Peijari ◽  
J. Rintala ◽  
R. Laukkanen
Keyword(s):  
Activated Carbon ◽  
Organic Carbon ◽  
Second Step ◽  
Humic Lake ◽  
Short Term ◽  
Feasible Method ◽  
Assimilable Organic Carbon ◽  
Water Treatment Plants ◽  
Ozone Dose ◽  
Ozonated Water

Upgrading an existing post-ozonation plant with two-step granular activated carbon (GAC) filtration for assimilable organic carbon (AOC) removal was studied. The effects of ozone dose on AOC formation and its removal in the subsequent two-step GAC filtration was studied using chemically pretreated 2 to 14° C humic lake water. Two parallel pilot-plant trains with different ozone doses (0 to 1.2 mgO3/mgTOC) and a short-term ozonation study were performed. The optimum ozone dose for maximum AOC formation was 0.4–0.5 mgO3/mgTOC. The AOC-P17 of ozonated water was three-fold higher and AOC-NOX over ten-fold higher than in non-ozonated water, while the following biofiltration (first step) removed 51% and 72% of AOC-P17 and AOC-NOX, respectively. The adsorber (second step) contributed to less than 10% of the overall AOC reduction. It appeared that biofiltration is a feasible method in upgrading water treatment plants for AOC removal even when treating cold humic waters, while the subsequent adsorber seems to have less significance for AOC removal.

Air-water interface: dynamics of nutrients and picoplankton in the surface microlayer of a humic lake

1997 ◽  
Vol 26 (2) ◽  
pp. 319-322 ◽  
Author(s):  
Anna Hillbricht-Ilkowska ◽  
Iwona Jasser ◽  
Iwona Kostrzewska-Szlakowska
Keyword(s):  
Surface Microlayer ◽  
Water Interface ◽  
Humic Lake ◽  
Interface Dynamics ◽  
Air Water Interface

Regular high contribution of Gonyostomum semen to phytoplankton biomass in a small humic lake

2002 ◽  
Vol 28 (1) ◽  
pp. 488-491
Author(s):  
Kalevi Salonen ◽  
Anna-Liisa Holopainen ◽  
Jorma Keskitalo
Keyword(s):  
Phytoplankton Biomass ◽  
Humic Lake ◽  
High Contribution ◽  
Gonyostomum Semen
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