ISO 20468-2:2019 PDF

Guidelines for performance evaluation of treatment technologies for water reuse systems — Part 2: Methodology to evaluate performance of treatment systems on the basis of greenhouse gas emissions

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Title (English):

ISO 20468-2:2019

Guidelines for performance evaluation of treatment technologies for water reuse systems — Part 2: Methodology to evaluate performance of treatment systems on the basis of greenhouse gas emissions

Document status:: Active
Format:: Electronic (PDF)
Number of pages:: 27
Publication date:: July 11, 2019
Edition:: ISO IS 20468 edition 1 version 1
ICS:: 13.020.40

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Description (English):

This document provides guidelines for evaluating the performance of treatment systems on the basis of greenhouse gas (GHG) emissions. In order to estimate greenhouse gas emissions from a treatment system, this document covers the estimate, types of GHG emission and sources, emission factor for each GHG, and global warming potential. The weight of greenhouse gases to be used in an evaluation is equivalent to emissions during operation of a treatment system. This document also defines a method for calculating carbon dioxide equivalent (CO2eq) emission intensity, in which GHG emissions are divided by the volume of reclaimed water. It also includes a method for evaluating the performance of a treatment system using CO2eq emission intensity.

Technical details

Technical committee: ISO/TC 282/SC 3 - Risk and performance evaluation of water reuse systems
SKU: ISO 20468-2:2019

Abstract

Overview

ISO 20468-2:2019 provides a standardized methodology to evaluate the environmental performance of water reuse treatment systems based on greenhouse gas (GHG) emissions. The standard focuses on estimating types and sources of GHGs, selecting appropriate emission factors, applying global warming potential (GWP) conversions, and calculating a normalized performance metric - CO2‑equivalent (CO2eq) emission intensity - expressed as GHG emissions per unit volume of reclaimed water. Evaluations are limited to the operational phase of treatment systems (the period during which the plant is in service).

Key technical topics and requirements

Principles: Guidance emphasizes relevance, completeness, consistency, accuracy and transparency when quantifying emissions.
Boundary conditions: Defines what to include in the assessment (treatment system, residue management, auxiliary systems) to ensure comparable results.
Stepwise calculation procedure (Clause 7):
- Step 1 - establish boundaries and evaluation scope
- Step 2 - calculate annual volume of reclaimed water
- Step 3 - quantify GHGs from energy consumption
- Step 4 - quantify biogenic emissions from biological treatment processes
- Step 5 - quantify emissions from consumables and waste generation
- Step 6 - account for GHG reductions enabled by resource recovery or reuse
- Step 7 - sum total GHG emissions
- Step 8 - compute CO2eq emission intensity (total CO2eq ÷ reclaimed water volume)
Data choices: Guidance on selecting activity data, emission factors and calculation methods to ensure defensible results.
Supporting material: Informative annexes include example emission factors, worksheets and sample CO2eq intensity calculations.

Practical applications and users

ISO 20468-2:2019 is used to:

Benchmark and compare treatment technologies by CO2eq emission intensity
Inform design decisions, process optimization and low‑carbon upgrades for water reuse plants
Support environmental performance reporting, carbon accounting and sustainability planning
Guide procurement, regulatory evaluation and lifecycle‑aware project appraisal

Primary users include water industry engineers, plant operators, environmental consultants, sustainability managers, regulators and researchers working on water reuse, carbon footprinting, and climate impact reduction for wastewater and water reclamation systems.

Related standards

ISO 20468-1:2018 - General guidelines for performance evaluation of treatment technologies for water reuse systems
ISO 20670 - Water reuse - Vocabulary (normative reference)
ISO 14064‑1 - GHG accounting and reporting (relevant for aligning accounting practice)

Keywords: ISO 20468-2:2019, water reuse, greenhouse gas emissions, CO2eq emission intensity, emission factors, reclaimed water, treatment systems, environmental performance.

Related standards

Standards mentioned in the description

Abstract

Overview

Key technical topics and requirements

Principles: Guidance emphasizes relevance, completeness, consistency, accuracy and transparency when quantifying emissions.
Boundary conditions: Defines what to include in the assessment (treatment system, residue management, auxiliary systems) to ensure comparable results.
Stepwise calculation procedure (Clause 7):
- Step 1 - establish boundaries and evaluation scope
- Step 2 - calculate annual volume of reclaimed water
- Step 3 - quantify GHGs from energy consumption
- Step 4 - quantify biogenic emissions from biological treatment processes
- Step 5 - quantify emissions from consumables and waste generation
- Step 6 - account for GHG reductions enabled by resource recovery or reuse
- Step 7 - sum total GHG emissions
- Step 8 - compute CO2eq emission intensity (total CO2eq ÷ reclaimed water volume)
Data choices: Guidance on selecting activity data, emission factors and calculation methods to ensure defensible results.
Supporting material: Informative annexes include example emission factors, worksheets and sample CO2eq intensity calculations.

Practical applications and users

ISO 20468-2:2019 is used to:

Benchmark and compare treatment technologies by CO2eq emission intensity
Inform design decisions, process optimization and low‑carbon upgrades for water reuse plants
Support environmental performance reporting, carbon accounting and sustainability planning
Guide procurement, regulatory evaluation and lifecycle‑aware project appraisal

Related standards

ISO 20468-1:2018 - General guidelines for performance evaluation of treatment technologies for water reuse systems
ISO 20670 - Water reuse - Vocabulary (normative reference)
ISO 14064‑1 - GHG accounting and reporting (relevant for aligning accounting practice)

Keywords: ISO 20468-2:2019, water reuse, greenhouse gas emissions, CO2eq emission intensity, emission factors, reclaimed water, treatment systems, environmental performance.

ISO 20468-2:2019 PDF

Technical details

Abstract

Overview

Key technical topics and requirements

Practical applications and users

Related standards

Related standards

Abstract

Overview

Key technical topics and requirements

Practical applications and users

Related standards

Related standards

Guidelines for performance evaluation of treatment technologies for water reuse systems — Part 1: General

Water reuse. Vocabulary

Greenhouse gases - Part 1: Specification with guidance at the organization level for quantification and repor…