Controlling Biofouling in Seawater Reverse Osmosis Membrane Systems

Released on by Nirajan Dhakal
preview-18

  • Controlling Biofouling in Seawater Reverse Osmosis Membrane Systems Book Detail

  • Author : Nirajan Dhakal
  • Release Date : 2017-12-01
  • Publisher : CRC Press
  • Genre : Science
  • Pages : 208
  • ISBN 13 : 1351056093
  • File Size : 50,50 MB
DOWNLOAD BOOK

Controlling Biofouling in Seawater Reverse Osmosis Membrane Systems by Nirajan Dhakal PDF Summary

Book Description: Seawater desalination is a rapidly growing coastal industry that is increasingly threatened by algal blooms. Depending on the severity of algal blooms, desalination systems may be forced to shut down because of clogging and/or poor feed water quality. To maintain stable operation and provide good feed water quality to seawater reverse osmosis (SWRO) systems, ultrafiltration (UF) pre-treatment is proposed. This research focused on assessing the ability of UF and other pre-treatment technologies to reduce biofouling in SWRO systems. An improved method to measure bacterial regrowth potential (BRP) was developed and applied at laboratory, pilot and full scale to assess the ability of conventional UF (150 kDa) and tight UF (10 kDa) alone and in combination with a phosphate adsorbent to reduce regrowth potential and delay the onset of biofouling in SWRO. The improved bacterial regrowth potential method employs a natural consortium of marine bacteria as inoculum and flow cytometry. The limit of detection of the BRP method was lowered to 43,000 ± 12,000 cells/mL, which is equivalent to 9.3 ± 2.6 μg-Cglucose/L. The reduction in bacterial regrowth potential after tight UF (10 kDa) was 3 to 4 times higher than with conventional UF (150 kDa). It was further reduced after the application of a phosphate adsorbent, independent of pore size of the UF membrane. Pilot studies demonstrated that the application of tight UF (10 kDa) coupled with a phosphate adsorbent consistently lowered the bacterial regrowth potential and no feed channel pressure drop increase was observed in membrane fouling simulators (MFS) over a period of 21 days. The study also showed that non-backwashable fouling of UF membranes varied strongly with the type of algal species and the algal organic matter (AOM) they release. The presence of polysaccharide (stretching -OH) and sugar ester groups (stretching S=O) was the main cause of non-backwashable fouling. In conclusion, this study showed that an improved BRP method is suitable for the assessment of SWRO pre-treatment systems and it can be a useful tool to develop potential strategies to mitigate biofouling and improve the sustainability of SWRO systems.

Disclaimer: www.yourbookbest.com does not own Controlling Biofouling in Seawater Reverse Osmosis Membrane Systems books pdf, neither created or scanned. We just provide the link that is already available on the internet, public domain and in Google Drive. If any way it violates the law or has any issues, then kindly mail us via contact us page to request the removal of the link.

Membrane Desalination

Membrane Desalination

File Size : 71,71 MB
Total View : 8429 Views
DOWNLOAD

This book aims to provide details about membrane desalination processes, starting from basic concepts leading to real world implementation. Chapters cover novel

Green Materials for Wastewater Treatment

Green Materials for Wastewater Treatment

File Size : 43,43 MB
Total View : 8252 Views
DOWNLOAD

This book reviews health hazards associated with wastewater use and water pollutants. Chapters present applications of green materials made of agricultural wast