Overview
ISO 20468-8:2022 - "Guidelines for performance evaluation of treatment technologies for water reuse systems - Part 8: Evaluation of treatment systems based on life cycle cost" provides a standardized life-cycle cost (LCC) methodology for evaluating treatment systems used in water reuse projects. The standard covers economic assessment for initial planning, operation and maintenance (O&M), and end-of-life/disposal stages. It integrates environmental impact into LCC analysis so stakeholders can determine whether project objectives are met and how operations can be improved or optimized.
Key topics
- Life-cycle costing (LCC) concepts applied to water reclamation technologies (capital, O&M, disposal costs).
- Timing of evaluation: planning, O&M and disposal stages; ability to replace planning assumptions with actual data as projects progress.
- Boundary definition: how to define the system boundary (water supply, wastewater treatment, reclamation, heat recovery, related facilities) to capture all affected processes.
- Cost elements definition: clear categorization of costs including capital, operation and maintenance, disposal, and costs/benefits from water and heat inputs or outputs.
- Calculation and evaluation procedures: methods to compare an alternative system against a baseline system using LCC.
- Environmental benefits: incorporation of water recovery ratio, heat output recovery ratio and other environmental impacts into economic evaluation.
- Supporting materials: informative annexes with examples for municipal reuse, industrial reuse and environmental-benefit evaluation; normative reference to ISO 20670 (vocabulary).
- Terminology & symbols: standardized terms, symbols and abbreviated terms for consistent reporting.
Applications and users
ISO 20468-8:2022 is intended for professionals involved in planning, selecting and assessing water reuse technologies, including:
- Water utilities and plant operators evaluating technology upgrades or new reclamation processes.
- Project owners and asset managers performing LCC-based decision making for capital investments.
- Engineers and consultants comparing alternative treatment trains (biological, physical, membrane solutions) and integrating heat/material recovery.
- Municipal and industrial stakeholders assessing cost-effective, sustainable water supply options and reporting economic plus environmental outcomes.
- Policymakers and funders seeking standardized LCC evidence for project approvals and financing.
Practical use cases: technology selection, cost-benefit comparisons of alternative systems vs baseline, optimization of O&M, estimating savings from water and heat recovery, and incorporating lifecycle environmental impacts into procurement and planning.
Related standards
Keywords: ISO 20468-8:2022, life-cycle cost, LCC, water reuse, treatment systems, economic evaluation, environmental impact, water recovery, heat recovery.