kSIST-TP FprCEN ISO/TR 22707:2025

SLOVENSKI STANDARD
01-maj-2025
Predelava, recikliranje, obdelava in odlaganje blata - Informacije o postopkih in
tehnologijah za pridobivanje/predelavo anorganskih snovi in hrani l(ISO/TR
22707:2023)
Sludge recovery, recycling, treatment and disposal - Information on the processes and
technologies for inorganic substance and nutrient recovery (ISO/TR 22707:2023)
Valorisation, recyclage, traitement et élimination des boues - Guide sur les procédés et
les technologies de récupération des substances inorganiques et des nutriments
(ISO/TR 22707:2023)
Ta slovenski standard je istoveten z: FprCEN ISO/TR 22707
ICS:
13.030.20 Tekoči odpadki. Blato Liquid wastes. Sludge
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

TECHNICAL ISO/TR
REPORT 22707
First edition
2023-07
Sludge recovery, recycling, treatment
and disposal — Information on
the processes and technologies for
inorganic substance and nutrient
recovery
Valorisation, recyclage, traitement et élimination des boues — Guide
sur les procédés et les technologies de récupération des substances
inorganiques et des nutriments
Reference number
ISO/TR 22707:2023(E)
ISO/TR 22707:2023(E)
© ISO 2023
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
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Published in Switzerland
ii
ISO/TR 22707:2023(E)
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Methods of nutrient recovery from sludge . 2
5 Phosphorus recovery .2
5.1 General . 2
5.2 Struvite recovery from either anaerobic digested sludge or filtrate of anaerobic
digested sludge, or both . 3
5.2.1 Principle . 3
5.2.2 Schematic diagram . 4
5.2.3 Operating conditions . 5
5.2.4 Characteristics of recovered products . 5
5.3 Hydroxyapatite recovery . 5
5.3.1 Principle . 5
5.3.2 Schematic diagram . 6
5.3.3 Operating conditions . 6
5.3.4 Characteristics of recovered products . 6
5.4 Phosphorus recovery from incineration ash . 6
5.4.1 Principle . 6
5.4.2 Alkaline treatment . 7
5.4.3 Acidic treatment . 8
5.4.4 Characteristics of recovered products/residues . 8
5.5 Phosphorus recovery from sewage sludge slag . 8
5.5.1 Principle . 8
5.5.2 Schematic diagram . 8
5.5.3 Operating conditions . 9
5.5.4 Characteristics of recovered products . 9
5.6 Other technologies for phosphorus recovery . 9
5.7 Summary . 10
6 Recovery of other nutrients .11
6.1 General . 11
6.2 Nitrogen . 11
6.3 Sulfur . 11
6.4 Potassium . 11
7 Recovery of other inorganics .11
7.1 General . 11
7.2 Metals . 11
Annex A (informative) Sewage sludge composition .13
Annex B (informative) Case studies .14
Bibliography .39
iii
ISO/TR 22707:2023(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO document should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www.iso.org/directives).
ISO draws attention to the possibility that the implementation of this document may involve the use
of (a) patent(s). ISO takes no position concerning the evidence, validity or applicability of any claimed
patent rights in respect thereof. As of the date of publication of this document, ISO had not received
notice of (a) patent(s) which may be required to implement this document. However, implementers are
cautioned that this may not represent the latest information, which may be obtained from the patent
database available at www.iso.org/patents. ISO shall not be held responsible for identifying any or all
such patent rights.
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to
the World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT), see
www.iso.org/iso/foreword.html.
This document was prepared by Technical Committee ISO/TC 275, Sludge recovery, recycling, treatment
and disposal.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www.iso.org/members.html.
iv
ISO/TR 22707:2023(E)
Introduction
Inorganics and nutrient recovery is necessary to build a sustainable society; there are many studies
and plants all over the world that demonstrate this concept. Above all, phosphorus recovery systems
to produce fertilizer material are increasingly common and other nutrients recovery systems are now
being developed.
This document provides a selected overview of various technologies and is based on country standards
and guidance documents already in existence or under preparation, and documents provided by
private organizations.
As inorganics and nutrient recovery knowledge and technology is developing rapidly, this document
will therefore be reviewed regularly to reflect the advancing nature of the industry and technology.
Annex A provides examples of sewage sludge composition, which can help determine which element(s)
can be recovered. Annex B provides case studies of nutrient recovery, including practical and emerging
ones.
v
TECHNICAL REPORT ISO/TR 22707:2023(E)
Sludge recovery, recycling, treatment and disposal —
Information on the processes and technologies for
inorganic substance and nutrient recovery
1 Scope
This document provides information on the processes and technologies for inorganic substance and
nutrient recovery from sludge.
This document is applicable to sludge and products from urban wastewater collection systems, night
soil, wastewater treatment plants for urban and similar industrial waters. It includes all sludge that can
have either similar environmental or health impacts, or both.
Hazardous sludge from industry and dredged sludge are excluded from this document.
2 Normat
...