AWWA WQTC69284

This powerpoint presentation begins by providing a brief overview of the Baldwin Park Operable Unit (BPOU), located in the San Gabriel Valley in southern California, and wasdeclared a Superfund Site in 1984due to volatile organic compounds (VOC) contamination. Perchlorate was discovered there in 1997. Perchlorate characteristics and perchlorate treatment at BPOU are outlined. A pilot study to evaluate the performance of four differentperchlorate-selective IX resins at threeutilities in the BPOU is presented and had the following objectives:pilot skids using representative operationalconditions;test new resins and those that had highcapacities in Cal Domestic pilot studies;assess nitrosamine leaching from the newresins; and,test spent resins for metals leaching (TCLPand California WET). Testing conditions are presented for resins, pilot skid and water quality. Results are provided for:perchlorate breakthrough;nitrosamine leaching; and,spent resin TCLP and California WET testing. Presentation conclusions indicate the following: the four tested tributylamine resins have a high capacityfor perchlorate removal, greater than 250,000 BVs watertreated, depending on water quality;resin capacity at Valley County was approximately 70% of thecapacity at La Puente, based on BVs of water treated,due to higher nitrate concentrations in the source water;the Dow PSR2 performed best at all three plants, however the performances of the four resins were notextremely different; resin selection for the three participating plantsmay be based on economics and operationconsiderations; all four resins leached NDBA and one may haveleached NDMA, but concentrations declined tobelow 10 ng/L within one hour of rinsing;the speciation of nitrosamine leaching reflects thefunctional amine groups present in the resins asobserved in the previous Cal Domestic study; and,TCLP and California WET testing indicated thatspent resin from the three utilities would not beclassified as hazardous waste. Results from this study, including a cost comparisonwith regenerable ion exchange systems, reveal thatsingle pass ion exchange is a feasible and cost competitiveoption for perchlorate treatment. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

11/01/2008

Number of Pages:

28

File Size:

1 file , 1.1 MB