Overview
EN ISO 5667-13:2011 - Water quality - Sampling - Part 13: Guidance on sampling of sludges provides practical guidance for planning and performing representative sampling of sludges from wastewater treatment works, water treatment works and industrial processes. Applicable to all types of sludges (including septic tank sludges and sludge cakes), the standard explains how to design sampling programmes, select equipment and containers, collect and homogenize samples, and manage sample storage, safety, labelling and reporting.
Keywords: EN ISO 5667-13:2011, sampling of sludges, sludge sampling, water quality, wastewater treatment.
Key topics
- Sampling programme design
- Defining sampling objectives and critical control/quality control points
- Considering variability (temporal, spatial and process-related) when choosing sample frequency and locations
- Sampling regimes and techniques
- Grab, composite and flow-related sampling approaches
- Proportional sampling methods for flowing sludges
- Replicate sampling and sampling performance assessment
- Equipment, containers and sample preservation
- Guidance on selection of sampling tools and containers suitable for sludge matrices
- Recommendations for preservation, handling and storage to maintain sample integrity
- Sample handling and sub-sampling
- Procedures for homogenization, quartering of sludge cakes and composite sample creation
- Practical notes on sample transport and storage temperatures
- Safety, labelling and reporting
- Health and safety considerations for field personnel
- Minimum requirements for documentation, sample identification and chain of custody
- Informative annexes
- Support on equipment selection, vacuum sampling devices, apparatus for sampling from pressurized pipes and worked examples (e.g., calculating minimum number of increments in a composite sample)
Applications
EN ISO 5667-13:2011 is used to ensure representative and legally defensible sludge sampling where accurate analytical results are required. Typical users include:
- Wastewater treatment and waterworks operators (process control, disposal decisions)
- Environmental laboratories and sampling teams (sample collection and QA/QC)
- Regulators and compliance officers (landfill acceptance, agricultural application limits)
- Sludge management and transport contractors
- Industrial process engineers and environmental consultants
- Researchers assessing sludge characteristics or treatment performance
Practical benefits: improved representativeness of samples, reliable data for process control, defensible compliance testing, and safer field procedures.
Related standards
For comprehensive sampling and handling practice, EN ISO 5667-13:2011 should be read with:
- ISO 5667-1 (sampling programme design)
- ISO 5667-10, -12, -14, -15 (wastewater, sediments, QA, preservation)
- ISO 6107 (vocabulary)
- Relevant technical reports (e.g., CEN/TR 13097 on sludge utilisation in agriculture)
This standard is essential for professionals responsible for sludge monitoring, quality assurance and environmental compliance.