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Cultivation of Green Microalgae in Bubble Column Photobioreactors and an Assay for Neutral Lipids

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Published on: January 7, 2019

Polymers as bubble surface modifiers in the flotation of algae.

Rita K Henderson¹, Simon A Parsons, Bruce Jefferson

¹UNSW Water Research Centre, University of New South Wales, Sydney, Australia.

Environmental Technology

|July 1, 2010

Summary

This summary is machine-generated.

Polymer dosing in dissolved air flotation (DAF) enhances algae removal by modifying bubbles. Higher molecular weight polyDADMAC improved removal efficiency, especially with specific algogenic organic matter characteristics.

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Area of Science:

Environmental Science
Water Treatment Engineering
Polymer Chemistry

Background:

Dissolved air flotation (DAF) is a key water treatment process.
Conventional DAF often uses upstream coagulation for algae removal.
Bubble modification offers an alternative approach to enhance DAF efficiency.

Purpose of the Study:

To investigate poly(diallyl-dimethylammonium chloride) (polyDADMAC) as a bubble modifier in an adapted DAF process.
To evaluate the impact of polyDADMAC molecular weight on algae removal.
To understand the role of algogenic organic matter (AOM) in polyDADMAC-mediated algae removal.

Main Methods:

Direct dosing of polyDADMAC to the DAF saturator.
Testing removal efficiencies for Microcystis aeruginosa.
Analyzing the influence of AOM characteristics (molecular weight, charge, hydrophobicity, protein content) on removal.

Main Results:

Algae removal efficiency increased with higher polyDADMAC molecular weight.
Observed removal efficiencies exceeded theoretical predictions, suggesting polymer projection into the aqueous phase.
PolyDADMAC dose and removal efficiency were significantly influenced by AOM properties.
Co-operative binding was favored by high MW, low charge, hydrophobic, and protein-rich AOM.

Conclusions:

PolyDADMAC effectively modifies bubbles in DAF, enhancing algae removal.
The interaction between polyDADMAC and AOM is crucial for optimizing the process.
This adapted DAF process shows promise for efficient algae removal, particularly for Microcystis aeruginosa.