WSP07975

• File Number: 8278.100
• Description: Title I - Yuma Desalting Plant
• Basin: Colorado Mainstem
• Date: 10/1/1987
• Author: USDOI/BOR
• Title: Yuma Desalting Plant Operations Study - Draft Special Report
• Water Supply Pro - Doc Type: Publication

I

I

I

I

pretreatment facility could be required. The estimated annual
O&M costs, including the annuali2ed capital cost of the low-
pressure upgrade, would be about $25.8 million per year. Reject
stream requirements would be 38,400 acre-feet per year.

I

Advantages:
"Assuming the membranes are acceptable, the plan reduces power
consumption yet maintains full productivity.

I

Disadvantages:
"The membranes may be unacceptable, and would require testing
before using them.
"The YDP would require modifications which are expected to be
fairly minor in scope and cost.
"The life of the membrane has not been demonstrated, but could be
longer or shorter than the current cellulose acetate membrane.
"The disinfection process for the new membrane is more difficult
and costly, the risk of premature membrane failure is greater.

I

I

I

Plan A-6. Use 1/3 Effective CaDacitv of the YDP.
Cost $20.2 million, TVS 1058 points, Category I.

I

Only 1/3 of the YDP capacity would be used (Plan A-G) and/or 2/3
capacity (Plan A-6A described later) of the base case capacities
would be used to satisfy only the salinity differential required
by the Minute. A major portion of the drainage water would be
bypassed so additional reject stream replacement water would be
required. This plan would require 90,900 acre-feet of reject
stream replacement"

I

I

Advantages:
.Power consumption is reduced.
"Power costs are saved.
"May reduce impact to shrimp fishing industry in Mexico"

I

I

Disadvantages:
"Reduced return flow credits to Arizona, quantity of brine stream
replacement must be increased or substitute water must be
found.
"Reduces the United States' ability to meet the Minute; if the
"United States does not meet the Minute, Mexico is expected to
object.
"Increases the amount of bypassed water with an overall increase
in water consumption.
"May be more difficult to measure the full impact of YDP product
on river salinity at the reduced capacity.
"The increase in total water consumption may meet resistance from
environmental groups and local governments.
"A reduced workforce will reduce local social benefits.

I

I

I

I

16

I