ISO 21939-2:2023

Method to calculate and express energy consumption of industrial wastewater treatment for the purpose of water reuse — Part 2: Accounting for energy recovery

This document sets out the general principles for, and provides guidance on, the quantitative characterization of energy recovery from wastewater and sludge treatment, and how to account for this in the total energy consumption calculation. The scope of this document includes: — a definition of the main energy recovery processes applicable to industrial wastewater treatment and sludge treatment for reuse, such as anaerobic digestion yielding biogas; — an introduction to the possible forms of energy generated by energy recovery processes and systems, such as electricity, steam or heat, and how to account for intentional wasting or commercial utilization of biogas; — guidance on the value to be taken into account as quantification of the energy generated, including the power actually generated on average; — a limit level for contaminated components in biogas allowed before any utilization; — principles to integrate the energy recovery results with the energy consumption in accordance with ISO 21939-1. Energy production which is not recovered from wastewater or sludge treatment processes is not within the scope of this document and is not included in the calculations and results expressed in it.

Titre manque — Partie 2: Titre manque

General Information

• Status: Published
• Publication Date: 19-Dec-2023
• ICS: 13.060.01 - Water quality in general
• ICS: 13.060.30 - Sewage water
• Technical Committee: ISO/TC 282/SC 4 - Industrial water reuse
• Drafting Committee: ISO/TC 282/SC 4/WG 1 - Characterization of energy consumption for industrial wastewater treatment
• Current Stage: 6060 - International Standard published
• Start Date: 20-Dec-2023
• Due Date: 27-Feb-2024
• Completion Date: 20-Dec-2023

Standards Content (Sample)

FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 21939-2
ISO/TC 282/SC 4
A method to calculate and express
Secretariat: SAC
energy consumption of industrial
Voting begins on:
2023-09-08 wastewater treatment for the purpose
of water reuse —
Voting terminates on:
2023-11-03
Part 2:
Accounting for energy recovery
RECIPIENTS OF THIS DRAFT ARE INVITED TO
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
DOCUMENTATION.
IN ADDITION TO THEIR EVALUATION AS
Reference number
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 21939-2:2023(E)
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 1 ----------------------
ISO/FDIS 21939-2:2023(E)
FINAL
INTERNATIONAL ISO/FDIS
DRAFT
STANDARD 21939-2
ISO/TC 282/SC 4
A method to calculate and express
Secretariat: SAC
energy consumption of industrial
Voting begins on:
wastewater treatment for the purpose
of water reuse —
Voting terminates on:
Part 2:
Accounting for energy recovery
COPYRIGHT PROTECTED DOCUMENT
© ISO 2023
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.
RECIPIENTS OF THIS DRAFT ARE INVITED TO
ISO copyright office
SUBMIT, WITH THEIR COMMENTS, NOTIFICATION
OF ANY RELEVANT PATENT RIGHTS OF WHICH
CP 401 • Ch. de Blandonnet 8
THEY ARE AWARE AND TO PROVIDE SUPPOR TING
CH-1214 Vernier, Geneva
DOCUMENTATION.
Phone: [phone]
IN ADDITION TO THEIR EVALUATION AS
Reference number
Email: [e-mail]
BEING ACCEPTABLE FOR INDUSTRIAL, TECHNO-
ISO/FDIS 21939-2:2023(E)
Website: www.iso.org
LOGICAL, COMMERCIAL AND USER PURPOSES,
DRAFT INTERNATIONAL STANDARDS MAY ON
Published in Switzerland
OCCASION HAVE TO BE CONSIDERED IN THE
LIGHT OF THEIR POTENTIAL TO BECOME STAN-
DARDS TO WHICH REFERENCE MAY BE MADE IN
ii
  © ISO 2023 – All rights reserved
NATIONAL REGULATIONS. © ISO 2023

---------------------- Page: 2 ----------------------
ISO/FDIS 21939-2:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 2
4 Energy recovery scenarios from wastewater and sludge anaerobic treatment
processes . 2
4.1 General . 2
4.2 Processing biogas from anaerobic digestion . 2
4.3 Flaring . 2
4.4 Electricity generation .
...

ISO/FDIS 21939-2:2023(E)
Date: 2023-06-14
ISO/TC 282/SC 04 4
Secretariat: SAC
Date: 2023-08-24
A method to calculate and express energy consumption of
industrial wastewater treatment for the purpose of water
reuse — Part 2: Accounting for energy recovery
Part 2:
Accounting for energy recovery
FDIS stage
© ISO 2023 – All rights reserved

---------------------- Page: 1 ----------------------
ISO/FDIS 21939-2:2023(E)
© ISO 2023
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: [phone]
EmailE-mail: [e-mail]
Website: www.iso.org
Published in Switzerland
ii © ISO 2023 – All rights reserved

---------------------- Page: 2 ----------------------
ISO/FDIS 21939-2:2023(E)
Contents
Foreword . iv
Introduction . v
1 Scope . 1
2 Normative references . 1
3 Terms, definitions and abbreviated terms . 1
3.1 Terms and definitions . 1
3.2 Abbreviated terms . 1
4 Energy recovery scenarios from wastewater and sludge anaerobic treatment processes. 2
4.1 General . 2
4.2 Processing biogas from anaerobic digestion . 2
4.3 Flaring . 2
4.4 Electricity generation . 2
4.5 Steam generation . 2
4.6 Heat recovery CHP generation . 2
4.7 Discharge of raw or processed gas for offsite use . 3
5 Guidelines for handling data on energy recovery . 3
5.1 General . 3
5.2 Limitation of contaminated components and impurities in biogas . 4
5.2.1 Limit levels for trace substances and impurities . 4
5.2.2 Gas cleaning systems . 5
5.2.3 Limitations on emissions from flaring systems . 5
5.2.4 Data and information required for the calculation of biogas yield . 5
5.3 Wastewater treatment plant energy
...