MWEA Lagoon Conference February 18, 2014 Holland, Michigan - - PowerPoint PPT Presentation

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Nov 23, 2022 43 likes •134 views

MWEA Lagoon Conference February 18, 2014 Holland, Michigan Duckweed Jeff Grames NuSystems, Inc. Duckweed in Michigan The Species of Duckweed in Michigan is Lemna Minor How Duckweed Reproduces How Fast Does Duckweed

SLIDE 1

MWEA Lagoon Conference

February 18, 2014 Holland, Michigan “Duckweed” Jeff Grames NuSystems, Inc.

SLIDE 2

Duckweed in Michigan

 The Species of Duckweed in Michigan is

Lemna Minor

 How Duckweed Reproduces  How Fast Does Duckweed Reproduce?

SLIDE 3

The Plusses and Minuses of Duckweed

 Plusses: Nutrient Removal  Minuses: Lower Oxygen Transfer

SLIDE 4

Photosynthesis and Respiration

Algae + CO2 + Sunlight More Algae + Oxygen + Carbonate

Biomass increases nutrient uptake ( P, N ).
Bacterial respiration decreases organic waste (C)
ReNew allows algae to produce more oxygen.

Carbon Dioxide Oxygen Pollutants Bacteria Algae

SLIDE 5

Lagoon Cell Two Influent

Influence of Time of Day on Dissolved Oxygen Levels

0.0 4.0 8.0 12.0 16.0 20.0 6:00 12:00 18:00 0:00 6:00 12:00 18:00

Time of Day DO, mg/l

DO Before, mg/l DO After, mg/l

SLIDE 6

Duckweed Control Methods

 Manual Removal  Chemical Control

SLIDE 7

Manual Removal

SLIDE 8

Chemical Removal

SLIDE 9

State and Federal Laws Regarding Pesticide Application

 Pesticide Use in the United States  Pesticide Applied to the Waters of Michigan  Certified Applicator