AWWA MTC53851

The Town of Erie, Colorado is a rapidly growing Denver area community. It hasexperienced unprecedented growth during the past few years placing increasing water demandson the Town's water supply and treatment facilities. Over 500 new water connections per yearhave occurred for the past three years increasing maximum day water demands from 1.0 million gallons per day (mgd) to3.2 mgd. This led to the design and construction of a new 4 mgd microfiltration membrane plant, that replaced the Town's 1.2 mgd conventional treatment plant.The new Town of Erie Lynn R Morgan Water Treatment Facility wascommissioned in March 2000. The new plant was constructed adjacent to the existing WTP.Some of the existing WTP facilities are used in conjunction with the new plant.Erie uses two distinct water sources with varying water qualities that pose some uniquechallenges for the microfiltration membranes. The sources of supply are Erie Lake and CarterLake. For a portion of the year, including the summer months, a blend of Erie and Carter Lakewater is treated. The challenge for Erie is to optimize the use of these two source waters tomaximize finished water production and optimize finished water quality.Erie Lake water is characterized by fluctuating algae, turbidity, dissolved organics, surface runoff, and seasonal temperatures. Carter Lake waterquality is characterized by cold temperatures and dissolved organics. Periodic high pH of up to10 to 11 occurs due to the dissolving of the pipeline cement mortar lining when pipeline flows areat low levels because of the low alkalinity of Carter Lake water. It became the primary source ofsupply for Erie up to the Town's water right limit of 1.5 mgd. However, high water demand inthe summer exceeds the Carter Lake water rights limit and Erie's source of supply must beaugmented from Erie Lake. This paper describes the new treatment plant and summarizes three operationalscenarios. A plant evaluation, focused on these scenarios, is presented. Includes tables, figures.

Product Details

Edition:

Vol. - No.

Published:

05/01/2001

Number of Pages:

17

File Size:

1 file , 370 KB