This slide presentation outlines a study on the comparative performance of high-rejection SWRO membranes. Specific study objectives included:
evaluate performance of three commercially
available, high rejection SWRO elements for
boron and TTS removal;
compare removal rates with projected data
from supplier's software programs; and,
estimate cost for feedwater alkalinization to
meet WHO standard. Topics outlined include: regulatory limits for boron; boron speciation in water, seawater, temperature effect, and salinity effect. An SWRO pilot plant is outlined and includes: experimental protocol; pilot configuration; reverse osmosis (RO) system with pH adjustment; manufacturer element specifications; RO System Performance
Permeate Boron Concentrations; manufacturer's projected permeate
Boron versus Feed pH; manufacturer's projected permeate
TDS versus Feed pH; SWRO TDS and Boron rejection; and, estimated cost of Boron compliance. Conclusions were:
at ambient pH (8.0), only manufacturer A met permeate
boron goal of 0.5 mg/L;
feedwater alkalinization to pH 9.0 was required for all
suppliers to comply boron goal;
TTS rejection was poor predictor of pH impact on boron
rejection, all supplier's products show constant TTS
rejection over range of feedwater pH values evaluated; and,
estimated cost of feedwater alkalinization to pH 9.0 is
$0.12/kgals of permeate. This represents an additional
operating expense of <10%. Includes figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 440 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 24 |
| Published : | 06/01/2006 |
