• Trade effluent sampling

    We routinely inspect and sample trade effluent discharges to check compliance with consent conditions and for determining the effluent strength for charging purposes.

    Trade effluent sampling is required to:

    • assess trade effluent volumes, strengths and loads
    • provide representative data to enable accurate assessment of trade effluent compliance with consents
    • obtain representative trade effluent charging data
    • assess and control the impact of trade effluent discharges on the wastewater processes.

    The sampling programme is subject to a quarterly review. Two types of samples will normally be scheduled - charging samples and audit samples.

    The sampling point and access arrangements must be approved by water2business. An inspection chamber or manhole point is needed so that samples of trade effluent discharge can be obtained for control and charging purposes.

    Charging samples are used to determine the average discharge strength in order to calculate appropriate trade effluent charges. The appropriate sampling frequency for charging samples is based on:

    • income/chargeable volume
    • variability of quality
    • robustness of sampling method.

    24-hour flow-related composite samples are preferred but if this is not possible or practicable a 24-hour time average composite sample is acceptable. If 24-hour composites are unobtainable or effluent quality is consistent spot samples are acceptable.

    Audit samples are used for monitoring compliance and detecting trends. Sampling frequency for audit samples is based on:

    • potential impact on (and risk to) staff, wastewater systems, receiving watercourses and water supply routes
    • variability of quality and/or flow rate
    • robustness of sampling method.

    Samples scheduled will be a mixture of spot samples for absolute consent conditions and/or composite samples to assess consent load limits. 

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