Green Stuff: The Biology of Algae and Duckweed

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This webinar will review the types of algae and duckweed, their similarities and differences, and what their presence reveals about lagoon conditions. You’ll learn how algae and duckweed affect treatment and how to solve effluent BOD and TSS problems; when the green stuff should be removed; and methods for mitigation.

0:00 Introduction
8:20 What is Duckweed?
10:05 What is Algae?
11:35 Algae Types
13:00 The Dream of Duckweed
18:15 Algae Metabolism
21:00 Problems with Algae and Duckweed
27:00 Chemical Treatment
30:30 Controlled Discharge
32:30 Lagoon Covers
35:40 Aeration & Mixing
37:20 Sludge Removal
39:05 Carp for Duckweed Control
41:50 Duckweed Skimming
44:20 Filtration for Algae Control
46:05 Ultrasonic Algae Control
47:15 Barley Straw
49:10 Conclusions
50:30 Questions and Answers

Preapproved for 1 continuing education hour in Alaska, Arizona, California, Idaho, Illinois, Indiana, Louisiana, Maine, Montana, New Hampshire, New Mexico, Ohio, South Dakota, Vermont, Washington, and Wyoming with the successful completion of the quiz and verified attendance. Likely accepted in states that do not preapprove CEUs, such as Alabama and South Carolina. Eligible for PDH credit in all states.

About the instructor

Julie Hartwig is a lagoon specialist for Triplepoint Environmental. She has a BS in Civil Engineering from the University of Illinois at Urbana-Champaign, a Master’s in Environmental Engineering from Penn State University, and extensive practical experience working with municipal and industrial wastewater treatment facilities. Julie has presented on lagoon topics at a number of regional conferences.