Skip to Main Content

Membrane Treatment of Secondary Effluent for Subsequent Use

Roderick D. Reardon
Roderick D. Reardon
Search for other works by this author on:
IWA Publishing
ISBN electronic:
Publication date:
May 2007

Granular-media filtered secondary effluent from a full-scale plant was subsequently treated at pilot-plant scale by combinations of low- and high pressure membranes. The feedwater was split between microfiltration (MF) and ultrafiltration (UF) treatment trains; ferric chloride (4 mg/L) was added to the UF feedwater. Filtrate from each of these trains became the feedwater to three different types of high-pressure membranes operating in parallel, two reverse osmosis (RO) units and one nanofiltration (NF) unit; no chemicals (e.g., chlorine) were added ahead of the high-pressure membranes to control biofouling.

Both the low- and high pressure membrane systems were operated at constant flux such that fouling was measured by an increase in transmembrane pressure (TMP). Membrane selectivity was measured by the rejection of total organic carbon (TOC), selected inorganic parameters, particle counts, turbidity and a virus challenge study. Specific flux was higher and the average TMP was lower for the UF system than for the MF system.

The fouling rate of three types of high-pressure membranes, as measured by the initial specific flux after cleaning and by the subsequent decline in specific flux, was lower for those receiving pretreatment by UF than by MF. The choice of membrane pretreatment did not affect rejection efficiency of any of the three high-pressure membranes.

This title belongs to WERF Research Report Series

ISBN: 9781843397595 (eBook)

Membrane Treatment of Secondary Effluent for Subsequent Use
By: Roderick D. Reardon
ISBN (electronic): 9781843397595
Publisher: IWA Publishing
Published: 2007

Download citation file:

This content is PDF only. Please click on the PDF icon to access.
Close Modal
This Feature Is Available To Subscribers Only

Sign In or Create an Account

Close Modal
Close Modal