A method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 1: Biological processes

This document sets out the general principles for, and provides guidance on, the quantitative characterization of the energy consumed by industrial biological wastewater treatment systems. It does not aim to characterize the treatment pollutants removal performance or process reliability or any other consideration in the selection of a wastewater treatment system. This document includes the following sub-systems of biological treatment system: — Biological reactors, which might be suspended growth or fixed film processes or a combination thereof, and can include anaerobic, anoxic and/or aerobic tanks and/or zones. — Solid-liquid separation processes such as sedimentation, flotation, or membrane filtration, used for clarification of the water before discharge to downstream processes, which can also involve the return of a the separated solids as sludge back to the biological reactor. — Any pumps, blowers and mixers for water circulation, mixing and air supply in and between the sub-systems listed herein. — Heating or cooling of the water for treatment. This document does not include the following subsystems of the biological treatment system: — Wastewater feed pumps. — Pre-treatment systems, which for the purposes of this document also include preliminary and primary treatment processes, such as but not limited to, screening, sedimentation, dissolved air flotation, chemical oxidation, oil separation. — Post-treatment processes, such as but not limited to, disinfection, desalination, ion exchange, sludge treatment and handling systems. — Site lighting or any energy consumption involved in office operation. — Energy recovery from processes such as anaerobic reactors producing biogas. Filtration processes, which are sometimes part of the biological treatment process and at other times part of the post treatment, are referred to separately within this document.

Titre manque — Partie 1: Titre manque

General Information

Publication Date
Current Stage
9020 - International Standard under periodical review
Start Date
Completion Date
Ref Project

Buy Standard

ISO 21939-1:2019 - A method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse
English language
12 pages
sale 15% off
sale 15% off

Standards Content (Sample)

STANDARD 21939-1
First edition
A method to calculate and express
energy consumption of industrial
wastewater treatment for the purpose
of water reuse —
Part 1:
Biological processes
Reference number
ISO 21939-1:2019(E)
ISO 2019

---------------------- Page: 1 ----------------------
ISO 21939-1:2019(E)

© ISO 2019
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2019 – All rights reserved

---------------------- Page: 2 ----------------------
ISO 21939-1:2019(E)

Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions, symbols and abbreviated terms . 2
3.1 Terms and definitions . 2
3.2 Symbols and abbreviated terms. 2
4 Expression and normalization of energy consumption . 2
4.1 Energy consumption indicator . . 2
4.2 Calculation . 4
5 Components contribution to the energy consumption . 4
5.1 General . 4
5.1.1 Steady state conditions . 4
5.1.2 Consideration of flow rate . 5
5.1.3 Calculation of variable consumptions . 5
5.1.4 Accounting for addition of oxidizing chemicals . 5
5.1.5 Physico-chemical separation pre-treatment processes . 5
5.2 List of system components . 6
5.2.1 General. 6
5.2.2 Aeration and combined mixing and aeration equipment . 6
5.2.3 Mixing . 6

Questions, Comments and Discussion

Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.