Overview - ISO 5667-13:2011 (Water quality - Guidance on sampling of sludges)
ISO 5667-13:2011 provides international guidance for the sampling of sludges from wastewater treatment works, water treatment works and industrial processes. It is applicable to all types of sludge (including septic tank sludges and sludge cakes) and covers the design of sampling programmes, selection of equipment, collection techniques, sample handling and storage, safety, labelling and reporting. The document is part of the ISO 5667 series on water quality sampling and is intended to be read alongside ISO 5667-1 and ISO 5667-15.
Key technical topics and requirements
- Scope and applicability
- Sampling of sludges from municipal and industrial sources; guidance covers liquid sludges, dewatered sludge cakes, stockpiles and heaps.
- Design of sampling programmes
- Define sampling objectives (process control, disposal limits, agricultural reuse, legal compliance).
- Consider temporal and spatial variability (daily, seasonal, event-driven) when setting sampling frequency, number of sites and replicates.
- Sampling terminology and sample types
- Definitions such as grab sample, composite sample, proportional sampling, and batch are provided to standardize practice.
- Equipment, containers and preservation
- Guidance on robust, simple sampling equipment and on container selection and preservation to avoid contamination or alteration of results.
- Annexes detail equipment selection, vacuum sampling devices and apparatus for sampling from pressurized pipes.
- Sampling procedures
- Recommendations for sampling regimes, replicate sampling, methodology for collection, homogenization and sub-sampling (e.g., quartering of sludge cakes).
- Sample storage, safety and reporting
- Storage conditions, labelling, documentation and safety precautions for personnel and laboratories.
- Supportive material
- Informative annexes (equipment selection, device examples, calculation of minimum samples for composites) and normative references (ISO 5667 series, ISO 6107, CEN/TR 13097).
Practical applications - who uses ISO 5667-13:2011
- Wastewater and waterworks operators for process control and performance monitoring
- Environmental and analytical laboratories validating sludge samples
- Industrial facilities managing sludge generation and disposal
- Regulators and compliance officers assessing pollutant concentrations for landfill or agricultural reuse
- Consultants and engineers designing monitoring programmes and sampling systems
Benefits include improved data quality, repeatable sampling methods, better decision-making for sludge treatment, transport and disposal, and clearer compliance evidence.
Related standards
- ISO 5667-1, -10, -12, -14, -15 (other parts of the Water quality - Sampling series)
- ISO 6107 (vocabulary)
- CEN/TR 13097 (sludge characterisation and agricultural utilisation guidance)
Keywords: ISO 5667-13:2011, sludge sampling, water quality, sampling programme, wastewater treatment, composite sample, grab sample, sludge cake, sampling equipment, sample preservation.