Role of dissolved air flotation (DAF) and liquid ferrate on mitigation of algal organic matter (AOM) during algal bloom events in RO desalination
Name:
Role of_DAF online version Seppur 2020.pdf
Size:
1.531Mb
Format:
PDF
Description:
Accepted Article
Embargo End Date:
2022-09-28
Type
ArticleKAUST Department
Environmental Science and Engineering ProgramBiological and Environmental Sciences and Engineering (BESE) Division
Water Desalination and Reuse Research Center (WDRC)
Date
2020-09-28Embargo End Date
2022-09-28Submitted Date
2020-06-05Permanent link to this record
http://hdl.handle.net/10754/665513
Metadata
Show full item recordAbstract
Harmful Algal Blooms (HABs) are considered a major contributor to membrane biofouling in Seawater Reverse Osmosis (SWRO) desalination plants. The presence of HABs in the raw feed water leads to an increase in membrane fouling rate, increase of chemical consumption, and can cause temporary shutdown of plants. Effective pretreatment can reduce the amount of organic foulants reaching the RO membrane and alleviate the problem of flux decline during RO operation and frequent membrane cleaning using chemicals. This study compared the effect of in-situ generated liquid ferrate and ferric chloride in combination with dissolved air flotation (DAF) as a pretreatment strategy to remove algal cells and algal organic matter (AOM) during algal bloom events. Experiments were performed using a bench-scale DAF unit. HABs conditions were simulated by harvesting AOM from cultivating Chaetoceros affinis (CA) in raw seawater to a concentration of around 10 mg C/L of dissolved organic carbon (DOC). The liquid ferrate was generated in-situ by wet oxidation of ferric chloride in analkaline media. The best performance was achieved with the combined use of liquid ferrate and DAF, removing up to 100% of algal cells, 99.99% of adenosine tri-phosphate (ATP), and up to 92% of AOM.Citation
Alshahri, A. H., Fortunato, L., Zaouri, N., Ghaffour, N., & Leiknes, T. (2021). Role of dissolved air flotation (DAF) and liquid ferrate on mitigation of algal organic matter (AOM) during algal bloom events in RO desalination. Separation and Purification Technology, 256, 117795. doi:10.1016/j.seppur.2020.117795Sponsors
The research reported in this paper was supported by funding from King Abdullah University of Science and Technology (KAUST). The authors acknowledge help, assistance and support from the Water Desalination and Reuse Center (WDRC) staff.Publisher
Elsevier BVAdditional Links
https://linkinghub.elsevier.com/retrieve/pii/S1383586620322693ae974a485f413a2113503eed53cd6c53
10.1016/j.seppur.2020.117795