Full Description

The objectives of this study were to: meet Information Collection Rule (ICR) requirements by conducting pilot-scale testing of nanofiltration (NF); determine if NF, when used to treat source water at the Canoe Brook Station (CBS),would provide a finished water meeting Stage II Disinfectant/Disinfection Byproducts regulations; and assess the operational issues and cost implications of using a dual membrane system at CBS. The pilot study was conducted during the period of November 1997 through April 1998 with a goal of achieving a minimum of 3,300 operational hours. In advance of the study, a bench-scale screening of four NF membranes was performed. A single element bench test apparatus was employed with concentrate recycle at ~66% system recovery to simulate a single pass, multiple array system operated at 93 percent recovery based on a solution-diffusion solute passage model. Screening was designed to identify a membrane having the best combination of high specific flux, high TOC/UVA-254 rejection and low calcium/alkalinity rejection in order to maximize DBP precursor removal, minimize impacts on finished water stability and minimize energy use. Based on these criteria, along with the need to obtain quick delivery times to meet the ICR schedule, the Osmonics DESAL model HL4040FF membrane element was selected for use in the pilot study. Includes 5 references, table, figures.

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Edition: Vol. - No. Published: 01/01/1999File Size: 1 file , 220 KB