TABLE 4.

Example values for key work breakdown structure model inputs for perchlorate removal

Technology	Input	Value selected to generate example costs
Anion exchange	Resin type	Perchlorate-selective
	Number of bed volumes before disposal	170,000 to 250,000
	Vessel configuration	2 vessels in series
	Empty bed contact time	3 min total for both vessels
	Disposal option for spent resin	Non-hazardous waste disposal by incineration
Biological treatment	Design type	Fluidized bed
	Electron donor requirements	10 mg/L acetic acid
	Biomass generation	8 mg/L
	Nutrient requirements	1 mg/L phosphoric acid (as phosphorus)
	Hydraulic residence time	12 min
	Post-treatment options	Aeration and polishing filter
	Discharge option for spent backwash	Recycle
POU/POE treatment	Technology	POU reverse osmosis (purchased)
	Water source	Groundwater
	Include UV disinfection	No

Abbreviations: POU, point-of-use; POU/POE, point-of-use/point-of entry; UV, ultraviolet.