Treated water becomes a useful resource when its quality, reliability and exposure risks fit the intended use. Start with the receiving process and the people who may contact the water, then work backward to treatment, storage and distribution.
Match source water to an approved use
Map process reuse, toilet flushing, cooling and other proposed uses individually. Define chemical, physical and microbiological criteria with the process owner and competent specialists. Include customer restrictions, product-contact risks, aerosols, public access and applicable permissions.
Discharge compliance, clear appearance and low conductivity do not demonstrate microbiological safety. RO permeate is not automatically drinking water. Potable supply requires its own regulatory, treatment and water-safety framework.
Control the complete reuse route
Consider treatment barriers, monitoring, storage turnover, recontamination and distribution. Prevent cross-connections with potable systems and use suitable identification and backflow protection. Specify what happens when a barrier fails or a monitored value is outside the approved range.
Provide an off-spec route and a safe fallback supply. Check peak demand and storage, not just daily averages. Include concentrate, cleaning waste and sludge in the project balance; recovery percentage alone does not describe total environmental performance.
Learn through a controlled trial
Use ISO 20426 for the non-potable health-risk framework and the ISO 20468 series for treatment-performance evaluation. These references do not supply a universal approval limit for every textile process. Agree acceptance criteria and verification before starting a trial.
Start with one source–user pair. Record quality over changing production conditions, operator feedback, actual freshwater displacement and the cost of every supporting treatment step. Expand only after the responsible people have reviewed the evidence and approved the use.
Practice downloads
Use the bilingual PDF worksheets in print or alongside the editable Excel files. Examples are for learning; adapt the records to the approved procedures and requirements at your site.
- 3R water planning and permissions worksheet (PDF · English / বাংলা)
- Textile 3R Water Planner — Excel (.xlsx)
- HIRA and environmental aspect registers — Excel (.xlsx)
Reference documents
- ISO 20426 — non-potable reuse health risks
- ISO water reuse risk and performance standards
- WHO Water Safety Plan Manual
- IFC General EHS Guidelines (PDF)
ISO catalogue pages identify the standards; access full texts through their publishers. Government and freely available guidance PDFs are linked directly above.
Continue learning
3R Water Planning in the Textile Industry · Effluent Sampling, Monitoring and Laboratory QA/QC · Bangladesh Water Act, Water Rules and WARPO
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