Algal Blooms and Membrane Based Desalination Technology: 1st Edition (Paperback) book cover

Algal Blooms and Membrane Based Desalination Technology

1st Edition

By Loreen Ople Villacorte

CRC Press

200 pages

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pub: 2014-05-29
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Seawater desalination is rapidly growing in terms of installed capacity (~80 million m3/day in 2013), plant size and global application. An emerging threat to this technology is the seasonal proliferation of microscopic algae in seawater known as algal blooms. Such blooms have caused operational problems in seawater reverse osmosis (SWRO) plants due to clogging and poor effluent quality of the pre-treatment system which eventually forced the shutdown of the plant to avoid irreversible fouling of downstream SWRO membranes. As more extra large SWRO plants (>500,000 m3/day) are expected to be constructed in the coming years, frequent chemical cleaning (>1/year) of SWRO installations will not be feasible, and more reliable pre-treatment system will be required. To maintain stable operation in SWRO plants during algal bloom periods, pre-treatment using ultrafiltration (UF) membranes has been proposed.

This thesis addresses the effect of algal blooms on the operation of UF pre-treatment and SWRO. Experimental investigations demonstrated that marine algal blooms can impact the backwashability of UF and can accelerate biological fouling in RO. However, it is unlikely that algae themselves are the main causes of fouling but rather the transparent exopolymer particles (TEPs) that they produce. To better monitor TEPs, a new method capable of measuring TEP as small as 10 kDa was developed and showed that TEPs can be effectively removed by UF pre-treatment prior to SWRO. This work also demonstrated that although TEPs and other algal-derived material (AOM) are very sticky and can adhere to UF and RO membranes, adhesion can be much stronger on membranes already fouled with AOM. Moreover, a model was developed to predict the accumulation of algal cells in capillary UF membranes which further demonstrated that the role of algal cells in UF fouling is not as significant as that of AOM and TEPs.

Overall, this study demonstrates that better analytical methods and tools are essential in elucidating the adverse impacts of algal blooms in seawater on the operation of membrane-based desalination plants (UF-RO). It also highlighted the importance of developing effective pre-treatment processes to remove AOM from the raw water and reduce the membrane fouling potential of the feed water for downstream SWRO membranes.

Table of Contents

1: General introduction

2: Marine algal blooms

3: Seawater reverse osmosis and algal blooms

4: Characterization of algal organic matter

5: Measuring transparent exopolymer particles in seawater and freshwater

6: Fate of transparent exopolymer particles in integrated membrane systems

7: Fouling of ultrafiltration membrane by algal biopolymers in seawater

8: Fouling potential of algae in inside-out capillary UF membrane

9: Biofouling in cross-flow membrane facilitated by algal organic matter

10: General conclusions

About the Author

Loreen Villacorte is Lecturer of Water Supply Engineering at UNESCO-IHE Institute for Water Education in the Netherlands. He completed his MSc degree on Water Supply Engineering at UNESCO-IHE and PhD degree at the Technical University of Delft. For the last 5 years, he has been involved in various research projects related to algal blooms and their impact on membrane filtration (including UF and RO membranes) in collaboration with the Wetsus Center of Excellence for Sustainable Water Technology. Currently, he is also involved in other research projects including developing/improving parameters to measure transparent exopolymer particles (TEP), natural organic matter (NOM) and microbial growth potential in conventional and advanced water treatment systems as well as biostability in water distribution system.

About the Series

IHE Delft PhD Thesis Series

IHE Delft PhD programme leads to a deepening of a field of specialisation. PhD fellows do scientific research, often with conclusions that directly influence their region. At IHE Delft, PhD researchers from around the world participate in problem-focused and solution-oriented research on development issues, resulting in an inspiring research environment. PhD fellows work together with other researchers from many countries dealing with topics related to water and the environment.

PhD research is often carried out in the ‘sandwich’ model. Preparation and final reporting – the first and last portion of the programme – are carried out in Delft, while actual research is done in the fellow’s home country, under co-supervision of a local institute. Regular contacts with the promotor are maintained through visits and long-distance communication. This enables researchers to employ solutions directly to problems in their geographical region.

IHE Delft PhD degrees are awarded jointly with a university. The degrees are highly valued and fully recognised in all parts of the world.

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Subject Categories

BISAC Subject Codes/Headings:
SCIENCE / Environmental Science
TECHNOLOGY & ENGINEERING / Environmental / Water Supply