Pathogen removal mechanisms in macrophyte and algal-based waste stabilization ponds were studied in Ghana and Colombia. The macrophytes used were water lettuce (Pistia stratiotes) and duckweeds (Lemna paucicostata and Spirodela polyrhiza). The selection of the species was based on economic importance and availability. Lemna was used during the initial investigations. However, Lemna could not withstand the ammonia levels in the wastewater used. Spirodela polyrhiza a rarer species in Ghana was therefore used in subsequent studies. The main mechanisms considered in this study were pH, protozoa predation and surface attachment. The microorganisms used were faecal bacteria namely; Escherichia coli, other coliforms, Salmonella sp., other enterobacteria, E. coli, ATCC13706 and enterococci. Studies were conducted using batch scale, continuous flow bench and pilot scale ponds. Results indicated in order of importance that long retention periods, attachment, sedimentation, predation and low pH are mechanisms in macrophyte ponds enhancing faecal bacteria removal, while in the algal ponds long retention periods, sunlight penetration, high pH, attachment and sedimentation are the mechanisms of importance in faecal bacteria removal. Presence of protozoa was also found to be important but true grazing studies could not be quantified. Dissolved oxygen did not play a major role in faecal bacteria removal.
eBook - ePub
Pathogen Removal Mechanisms in Macrophyte and Algal Waste Stabilization Ponds
PhD: UNESCO-IHE Institute, Delft
- English
- ePUB (mobile friendly)
- Available on iOS & Android
eBook - ePub
Pathogen Removal Mechanisms in Macrophyte and Algal Waste Stabilization Ponds
PhD: UNESCO-IHE Institute, Delft
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Subtopic
MicrobiologyTable of contents
- Cover
- Half Title
- Title Page
- Copyright Page
- Dedication
- Acknowledgements
- List of Abbreviations
- Contents
- Abstract
- Chapter One Introduction
- Chapter Two Environmental Conditions and Enterococci Removal in Macrophyte and Algal-Based Domestic Wastewater Treatment Systems
- Chapter Three The Effect of pH on Enterococci Removal in Water Lettuce, Duckweed and Algal Ponds
- Chapter Four Environmental Conditions and Effect of pH on Faecal Coliform Removal in Macrophyte and Algal Ponds
- Chapter Five Effect of pH Fluctuations on Pathogenic Bacteria Removal in Domestic Wastewater 69
- Chapter Six Comparative Performance studies of macrophyte and algal pondsUsing Low Strength Sewage
- Chapter Seven Comparative Performance Studies of Macrophyte and Algal Ponds Using Medium Strength Sewage
- Chapter Eight The Role of Attachment in the Removal of Faecal Bacteria from Macrophyte and Algal Waste Stabilization Ponds
- Chapter Nine Effect of Protozoa on Faecal Bacteria Removal in Macrophyte and Algal Waste Stabilization Ponds
- Summary in English
- Summary in Dutch
- Curriculum vitae
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Yes, you can access Pathogen Removal Mechanisms in Macrophyte and Algal Waste Stabilization Ponds by E. Awuah in PDF and/or ePUB format, as well as other popular books in Technology & Engineering & Microbiology. We have over 1.5 million books available in our catalogue for you to explore.