How Can We Use Fluorescence And Artificial Intelligence To Better Control Blue-Green Algal Blooms?

2018 ◽  
Author(s):  
Edoardo Bertone ◽  
Michele A. Burford ◽  
David P. Hamilton
Keyword(s):  
Artificial Intelligence ◽  
Algal Blooms ◽  
Green Algal

Case Studies on Cultural Eutrophication on Watersheds Around Lakes that Contribute to Toxic Blue-Green Algal Blooms

2020 ◽  
pp. 357-372
Author(s):  
Mary Claire Cooperrider ◽  
Lydia Davenport ◽  
Sydney Goodwin ◽  
Landon Ryden ◽  
Nathan Way ◽  
...  
Keyword(s):  
Case Studies ◽  
Algal Blooms ◽  
Cultural Eutrophication ◽  
Green Algal

Enzyme-Linked Immunosorbent Assay for Microcystins in Blue-Green Algal Blooms

1990 ◽  
Vol 73 (3) ◽  
pp. 451-456 ◽  
Author(s):  
Fun S Chu ◽  
Xuan Huang ◽  
R D Wei
Keyword(s):  
Liquid Chromatography ◽  
Immunosorbent Assay ◽  
Algal Blooms ◽  
Ammonium Bicarbonate ◽  
Enzyme Linked Immunosorbent Assay ◽  
Standard Curve ◽  
Green Algal ◽  
Recovery Study ◽  
Minimum Detection Level ◽  
Elisa Plate

Abstract A direct competitive enzyme-linked immunosorbent assay (ELISA) for the freshwater blue-green algal toxin mlcrocystln (MCYST) In algae and water was developed. The assay Involves coating antl-MCYST-variant leuclne-arglnine (LR) antibody to the ELISA plate and the use of MCYST-LRperoxidase as the enzyme marker. The linear portion of the standard curve for MCYST in phosphate buffer containing saline (PBS) was 0.5-10.0 ng/mL (25-500 pg/assay). The minimum detection level for MCYST-LR was 0.20 ng/mL (10 pg/assay). Contaminated water could be directly used In the ELISA. The overall analytical recoveries for MCYST-LR added to water at levels of 1-20 ng/mL was 83.4%. For analysis of cellular MCYST, the toxin was first extracted from the algae with 0.1M ammonium bicarbonate, diluted with PBS to less than 0.5 mg dried algae/mL (<5.0 mg wet welght/mL) and directly used in the ELISA. C-18 reverse-phase Sep-Pak cartridges effectively adsorbed MCYST from the toxln-containlng solutions. The toxin could be recovered from the cartridge by elutlng with 60% methanol. Using this approach, an algae extract that was relatively free of MCYST was prepared and was used in a recovery study. The overall analytical recovery of MCYST added to the algae extract In the range of 0.25-20 ppm was 83% with a coefficient of variation of 11.9%. The detection limit for MCYST In dried algae was about 0.25-0.5 pg/g (0.25-0.5 ppm) lyophlllzed algae sample. This method was applied for the analysis of several naturally occurring algal blooms. Limited samples were also analyzed for MYCST by liquid chromatography. ELISA data were in general agreement with those obtainedby liquid chromatography. MCYST concentrations from 0.006 to 2.9 fig/g (6 to 2900 ppb) and from 26 to 5200 /ig/g (26 ppm to 5200 ppm) were found In water and algae (dried weight), respectively

Carcoar Wetland – A Wetland System for River Nutrient Removal

1994 ◽  
Vol 29 (4) ◽  
pp. 169-176 ◽  
Author(s):  
G. C. White ◽  
I. C. Smalls ◽  
P. A. Bek
Keyword(s):  
Constructed Wetlands ◽  
Community Involvement ◽  
Nutrient Removal ◽  
Algal Blooms ◽  
Flood Plain ◽  
Principal Function ◽  
Nutrient Inputs ◽  
Green Algal ◽  
Wetland System ◽  
Design Construction

During December, 1991 the NSW Department of Water Resources commenced construction of an artificial wetland at the upstream end of Carcoar Dam near Blayney in central western NSW. The principal function of the wetland is to reduce nutrient inputs, especially phosphorus, from the Belubula River into Carcoar storage and consequently lower the incidence of blue-green algal blooms which occur most summers. The wetland is a multi-faceted project involving substantial research and community involvement. Construction of the wetland weir and levees was completed during April, 1992. Stage one of the wetland planting program ran from October to December, 1992 with stage two scheduled for the same period in 1993. The wetland will not be operational until December, 1993. However, even at this early point in the project, significant experience has been gained in design, construction, planting and establishment of comprehensive community involvement programs for large constructed wetlands on the flood plain. This paper outlines the background to the wetland, the design of the wetland system and its construction primarily as a nutrient removal mechanism in the Belubula River. The paper also outlines the direction of research undertaken and the role and nature of community involvement in various aspects of the project.

Role of landuse in the occurrence of blue-green algal blooms

1990 ◽  
Vol 24 (1) ◽  
pp. 671-676 ◽  
Author(s):  
L. H. Kauppi ◽  
S. T. Knuuttila ◽  
K. O. Sandman ◽  
K. Eskonen ◽  
S. Luokkanen ◽  
...  
Keyword(s):  
Algal Blooms ◽  
Green Algal

Feeding and control of blue-green algal blooms by tilapia (Oreochromis Niloticus)

Hydrobiologia ◽  
2006 ◽  
Vol 568 (1) ◽  
pp. 111-120 ◽  
Author(s):  
Kaihong Lu ◽  
Chunhua Jin ◽  
Shuanglin Dong ◽  
Binhe Gu ◽  
Stephen H. Bowen
Keyword(s):  
Oreochromis Niloticus ◽  
Algal Blooms ◽  
Green Algal ◽  
And Control

Magnitude of Blue-Green Algal Blooms in a Saline Desert Lake Evaluated by Remote Sensing: Evidence for Nitrogen Control

1988 ◽  
Vol 45 (11) ◽  
pp. 1959-1967 ◽  
Author(s):  
David L. Galat ◽  
James P. Verdin
Keyword(s):  
Surface Water ◽  
Algal Blooms ◽  
Inorganic Nitrogen ◽  
Seasonal Succession ◽  
Climatic Forcing ◽  
Pyramid Lake ◽  
Green Algal ◽  
Mixing Patterns ◽  
Saline Desert ◽  
Desert Lake

Seventy-six percent of the 1972–86 variability in remotely sensed maximum surface water biomass of Nodularia spumigena blooms in Pyramid Lake, Nevada, was explained by concentrations of surface water total nitrogen (TN) during the preceding winter circulation. Very large summer–autumn Nodularia blooms were recorded by Landsat subsequent to low early winter surface water TN concentrations, very low fluvial discharge, and fluvial TN loads as predicted, but contrary to predictions, also when fluvial discharge and TN loads were very high. The observed cause of large Nodularia blooms following high fluvial nitrogen influx was temporary meromixis produced by the large volume of freshwater transporting this nitrogen. Incomplete winter lake circulation reduced internal transport of hypolimnetic nitrogen to surface waters. Meromixis resulted in early stable summer thermal stratification and early depletion of epilimnetic inorganic nitrogen, followed by early and large Nodularia blooms. Variations in magnitude of historic Nodularia blooms in a saline desert lake support the generality of blue-green algal dominance in lakes with low nitrogen and high phosphorus concentrations (i.e. low N:P ratios). However, climatic forcing of fluvial discharge and lake mixing patterns were also shown to be important determinants of seasonal succession of phytoplankton to blue-greens.

New challenges for the management of plant nutrients and pathogens in the Waikato River, New Zealand

2001 ◽  
Vol 43 (5) ◽  
pp. 137-144 ◽  
Author(s):  
W. N. Vant
Keyword(s):  
Water Quality ◽  
Algal Blooms ◽  
Diffuse Sources ◽  
Industrial Wastewaters ◽  
The Past ◽  
Green Algal ◽  
New Challenges ◽  
Better Than ◽  
Waikato River

The water quality of the Waikato River is currently much better than it was in the 1950s. Major improvements in the treatment of the sewage and industrial wastewaters which are discharged to the river mean that levels of indicator bacteria in the lower reaches of the river are now many times lower than in the past. Eve so, conditions are still not suitable for swimming, and blue-green algal blooms occur at times. Non-point or diffuse sources of contaminants now dominate the nutrient and pathogens budgets. Progressively-intensifying farming, particularly in lowland areas, is thought to contribute the majority of the contaminants found in the river. Future improvements in water quality will therefore depend more on activities like changes to farming practice – such as retiring the riparian margins of lowland tributaries of the river – than on further advances in wastewater treatment.

The Role of Estuarine Modeling in Nutrient Control

1988 ◽  
Vol 20 (6-7) ◽  
pp. 243-252 ◽  
Author(s):  
Wu-Seng Lung
Keyword(s):  
Phytoplankton Biomass ◽  
Algal Blooms ◽  
Wastewater Treatment Plants ◽  
Substantial Reduction ◽  
Nitrogen Fixing ◽  
Variable Model ◽  
Species Dominance ◽  
Green Algal ◽  
Limiting Condition ◽  
The Impact

Two case studies are presented to demonstrate how estuarine water quality models can be used in planning eutrophication control. In the first study, a steady-state model is used to assess the impact of point source phosphorus reduction on the phytoplankton biomass in the upper James Estuary in Virginia during the summer months. The modeling results indicate that phosphorus is in ample supply to support the phytoplankton growth in the system. However, substantial reduction of loads by phosphorus removal at the wastewater treatment plants would lead to a phosphorus limiting condition thereby lowering the phytoplankton biomass levels. In the second study, a time-variable model is developed to investigate the potential of blue-green algal (Microcystis) blooms in the Neuse Estuary in North Carolina. More specifically, the model is designed to address two management questions. First, recognizing that high nonpoint nitrogen loads in the spring months would lead to a proliferation of non-nitrogen fixing blue-green genera, should parallel control of nitrogen be considered? Second, in light of the potential for algae species dominance to shift, is control of nitrogen fixing blue-green algal blooms possible? Based on the modeling calibration results using data from 1983, 1984 and 1985 under different hydrologic conditions, freshwater flow to the estuary is found to be a key factor in controlling blue-green algal blooms in the Neuse Estuary.

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