TY - GEN
T1 - Effects of well intake systems on removal of algae, bacteria, and natural organic matter
AU - Rachman, Rinaldi
AU - Dehwah, Abdullah H.A.
AU - Li, Sheng
AU - Winters, Harvey
AU - Al-Mashharawi, Samir
AU - Missimer, Thomas
N1 - Publisher Copyright:
© Springer International Publishing Switzerland 2015.
PY - 2015
Y1 - 2015
N2 - Analyses of the changes in concentration of algae, bacteria, transparent exopolymer particles (TEP), and the fractions of natural organic matter (NOM) impacts between surface seawater and the discharges of well intake systems were evaluated at seven different seawater reverse osmosis water (SWRO) treatment plants. In nearly all cases, travel of the raw seawater through the seabed into the aquifer and into the wells removed all of the algae. Bacteria removal was up to 98.5 %, but varied greatly between sites and in different wells at each site. The TEP concentration was significantly lowered compared to the natural seawater. The biopolymer fraction of NOM was significantly lowered at all sites, but the lighter fractions of the NOM were removed at lower percentages. The removal percentage of NOM fractions appears to be based on molecular weight (and size) with the lighter weight fractions removed at lower percentages. A key factor controlling the removal of organic material appears to by the hydraulic retention time which is controlled by the length of the flowpath and the type of aquifer porosity. Specific site geology does not seem to be a significant factor. Vertical well systems showed greater organic materials removal compared to horizontal and tunnel intake systems. Again, this appears to be related to the length of the flowpath and the hydraulic retention time. The horizontal well system at Alicante, Spain showed poor removal of organic matter and breakthrough of algae occurred in the system.
AB - Analyses of the changes in concentration of algae, bacteria, transparent exopolymer particles (TEP), and the fractions of natural organic matter (NOM) impacts between surface seawater and the discharges of well intake systems were evaluated at seven different seawater reverse osmosis water (SWRO) treatment plants. In nearly all cases, travel of the raw seawater through the seabed into the aquifer and into the wells removed all of the algae. Bacteria removal was up to 98.5 %, but varied greatly between sites and in different wells at each site. The TEP concentration was significantly lowered compared to the natural seawater. The biopolymer fraction of NOM was significantly lowered at all sites, but the lighter fractions of the NOM were removed at lower percentages. The removal percentage of NOM fractions appears to be based on molecular weight (and size) with the lighter weight fractions removed at lower percentages. A key factor controlling the removal of organic material appears to by the hydraulic retention time which is controlled by the length of the flowpath and the type of aquifer porosity. Specific site geology does not seem to be a significant factor. Vertical well systems showed greater organic materials removal compared to horizontal and tunnel intake systems. Again, this appears to be related to the length of the flowpath and the hydraulic retention time. The horizontal well system at Alicante, Spain showed poor removal of organic matter and breakthrough of algae occurred in the system.
UR - http://www.scopus.com/inward/record.url?scp=84945906075&partnerID=8YFLogxK
U2 - 10.1007/978-3-319-13203-7_9
DO - 10.1007/978-3-319-13203-7_9
M3 - Conference contribution
AN - SCOPUS:84945906075
SN - 9783319132020
T3 - Environmental Science and Engineering (Subseries: Environmental Science)
SP - 163
EP - 193
BT - Intakes and Outfalls for Seawater Reverse Osmosis Desalination Facilities - Innovations and Environmental Impacts
A2 - Jones, Burton
A2 - Missimer, Thomas M.
A2 - Maliva, Robert G.
PB - Kluwer Academic Publishers
T2 - International Workshop on Desalination System Intakes and Outfalls, 2013
Y2 - 7 October 2013 through 8 October 2013
ER -