ISO 23070:2020 PDF

Water Reuse in Urban Areas — Guidelines for reclaimed water treatment: Design principles of a RO treatment system of municipal wastewater

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Title (English):

ISO 23070:2020

Water Reuse in Urban Areas — Guidelines for reclaimed water treatment: Design principles of a RO treatment system of municipal wastewater

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 22
Publication date:: December 9, 2020
Edition:: ISO IS 23070 edition 1 version 1
ICS:: 13.060.01

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Description (English):

This document provides guidelines for the planning and design of a reverse osmosis (RO) treatment system of municipal wastewater. This document is applicable to practitioners and authorities who intend to implement principles and decisions on RO treatment of municipal wastewater in a safe, reliable and sustainable manner. This document addresses RO treatment systems of municipal wastewater in their entirety and is applicable to any RO treatment system component. This document provides: — standard terms and definitions; — a description of the system components of an RO treatment system of municipal wastewater; — design principles of an RO treatment system of municipal wastewater; — statements on the feed water quality and technical requirements of an RO treatment system; — guidance for operation and maintenance of an RO treatment system; — specific aspects for consideration and emergency response. Design parameters and regulatory values of an RO treatment system of municipal wastewater are out of the scope of this document.

Technical details

Technical committee: ISO/TC 282/SC 2 - Water reuse in urban areas
SKU: ISO 23070:2020

Abstract

Overview

ISO 23070:2020 - "Water Reuse in Urban Areas - Guidelines for reclaimed water treatment: Design principles of a RO treatment system of municipal wastewater" provides comprehensive guidance for planning and designing reverse osmosis (RO) systems treating municipal wastewater for water reuse. It addresses the RO treatment system in its entirety, from terminology and system components through pre‑treatment, RO unit design, operation, maintenance and emergency response. Design parameters and regulatory values are explicitly out of scope.

Keywords: ISO 23070:2020, water reuse, reverse osmosis, RO treatment system, municipal wastewater, reclaimed water, RO design guidelines

Key topics and technical requirements

Scope and terminology
- Standard terms and definitions related to RO reclaimed water treatment.
System components
- Feed water source, pre‑treatment, RO treatment unit, auxiliary equipment, post‑treatment and monitoring systems.
Feed water quality indices
- Guidance on important indicators such as silt density index (SDI), organic load, biological activity and oxidation‑reduction potential (ORP).
Pre‑treatment considerations
- Mechanical options: clarification, media/multimedia filters, activated carbon, micro/ultrafiltration, cartridge filters.
- Chemical options: antiscalants, oxidants for disinfection, reductants, non‑oxidizing biocides.
RO unit design
- RO feed pumps, membrane modules, pressure vessels, membrane material and module selection, and system configuration.
Operating and performance parameters
- Operational variables to consider (pressure, temperature, feed flow, permeate flux, concentrate flow, pH).
- Performance metrics: permeate flow, salt rejection, pressure drop.
Automation, control and maintenance
- Dosing systems, instrumentation, control/monitoring strategies, cleaning procedures (physical and chemical), integrity testing and failure response.
Concentrate management & emergencies
- Guidance on RO concentrate handling and requirements for emergency response planning.
Informative annexes
- Example system, chlorine disinfection information, maturity level of technologies for concentrate treatment.

Applications and users

ISO 23070:2020 is aimed at practitioners and authorities involved in municipal wastewater reclamation and urban water reuse, including:

Water utilities and plant operators
Process and civil engineers designing RO systems
Consulting firms and system integrators
Regulatory and permitting authorities
Project planners assessing feasibility for industrial reuse (e.g., boiler makeup, process water)

This guidance supports safe, reliable and sustainable RO implementation while helping reduce fouling risk, optimize pre‑treatment selection and define robust operation and maintenance practices.

Related information

Developed by ISO/TC 282 (Water reuse), the document includes informative annexes with practical examples and technology maturity. For complementary technical or regulatory details, refer to other ISO and national standards on water reuse, membrane technologies and wastewater treatment.

Related standards

Other ISO standards

Abstract

Overview

Keywords: ISO 23070:2020, water reuse, reverse osmosis, RO treatment system, municipal wastewater, reclaimed water, RO design guidelines

Key topics and technical requirements

Scope and terminology
- Standard terms and definitions related to RO reclaimed water treatment.
System components
- Feed water source, pre‑treatment, RO treatment unit, auxiliary equipment, post‑treatment and monitoring systems.
Feed water quality indices
- Guidance on important indicators such as silt density index (SDI), organic load, biological activity and oxidation‑reduction potential (ORP).
Pre‑treatment considerations
- Mechanical options: clarification, media/multimedia filters, activated carbon, micro/ultrafiltration, cartridge filters.
- Chemical options: antiscalants, oxidants for disinfection, reductants, non‑oxidizing biocides.
RO unit design
- RO feed pumps, membrane modules, pressure vessels, membrane material and module selection, and system configuration.
Operating and performance parameters
- Operational variables to consider (pressure, temperature, feed flow, permeate flux, concentrate flow, pH).
- Performance metrics: permeate flow, salt rejection, pressure drop.
Automation, control and maintenance
- Dosing systems, instrumentation, control/monitoring strategies, cleaning procedures (physical and chemical), integrity testing and failure response.
Concentrate management & emergencies
- Guidance on RO concentrate handling and requirements for emergency response planning.
Informative annexes
- Example system, chlorine disinfection information, maturity level of technologies for concentrate treatment.

Applications and users

ISO 23070:2020 is aimed at practitioners and authorities involved in municipal wastewater reclamation and urban water reuse, including:

Water utilities and plant operators
Process and civil engineers designing RO systems
Consulting firms and system integrators
Regulatory and permitting authorities
Project planners assessing feasibility for industrial reuse (e.g., boiler makeup, process water)

This guidance supports safe, reliable and sustainable RO implementation while helping reduce fouling risk, optimize pre‑treatment selection and define robust operation and maintenance practices.

ISO 23070:2020 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Applications and users

Related information

Related standards

Abstract

Overview

Key topics and technical requirements

Applications and users

Related information

Related standards

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