Skip to Main Content
Desalination, 2nd Edition
book

Desalination, 2nd Edition

by Jane Kucera
April 2019
Intermediate to advanced content levelIntermediate to advanced
768 pages
21h 31m
English
Wiley-Scrivener
Content preview from Desalination, 2nd Edition

Chapter 3Basic Terms and Definitions

Mark Wilf

European Desalination Society at the Genoa University, Italy and San Diego, CA, USA

Abstract

This chapter defines basic terms used in conjunction with RO systems. Also see Chapter 9 for additional information as to how these parameters affect the performance of an RO system.

3.1 Reverse Osmosis System Flow Rating

An RO system is rated based on product flow rate. An 800-gpm RO would yield 800 gpm of permeate. The influent and reject flows are typically not indicated except in the design details (they are usually calculated knowing the product flow rate and the percent recovery).

In some cases, the actual design permeate flow rate of the RO system may differ from the “name plate” flow rating. In most of these situations, the RO system is de-rated by design due to a poor feed water source or as a natural result of low feed water temperature.

3.2 Recovery

Recovery (sometime referred to as “conversion”) is a term used to describe what volume percentage of influent water is “recovered” as permeate. Generally, RO system recoveries range from about 50% to 85%, with the majority of systems designed for 75% recovery. (Individual spiral wound membrane module recoveries vary from about 10% to 15%—see Chapter 4.3). A system recovery of 75% means that for every 100 gpm influent, 75 gpm will become permeate and 25 gpm will be retained as concentrate.

Recovery is calculated using the following equation:

(3.1)

At 75% recovery, the concentrate ...

Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Handbook of Biofuels Production, 2nd Edition

Handbook of Biofuels Production, 2nd Edition

Rafael Luque, Carol Ki Lin, Karen Wilson, James Clark
Subsea Engineering Handbook

Subsea Engineering Handbook

Yong Bai, Qiang Bai
Energy Storage, 2nd Edition

Energy Storage, 2nd Edition

Ralph Zito, Haleh Ardebili

Publisher Resources

ISBN: 9781119407744Purchase book